GB2056565A - Valve driving fluid operated actuator - Google Patents
Valve driving fluid operated actuator Download PDFInfo
- Publication number
- GB2056565A GB2056565A GB8018235A GB8018235A GB2056565A GB 2056565 A GB2056565 A GB 2056565A GB 8018235 A GB8018235 A GB 8018235A GB 8018235 A GB8018235 A GB 8018235A GB 2056565 A GB2056565 A GB 2056565A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston rod
- piston
- cylinder
- valve
- driving apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 61
- 230000006835 compression Effects 0.000 claims abstract description 31
- 238000007906 compression Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 7
- 239000000057 synthetic resin Substances 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 claims 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/066—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the scotch yoke type
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
- Mechanically-Actuated Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
An actuator comprises a casing proper (26) provided in the interior thereof with a movement conversion- transmission mechanism (30), a piston and cylinder assembly (34) freely detachably fixed to one end of the casing (26), and a supporting device (33) for the piston rod of the assembly (34), the device 33 being freely detachably fixed to the other end of the casing. The actuator can be adapted to the operation of different sizes and kinds of valves merely by the replacement of the assembly (34) and device (33) while using the same casing 26. The actuator is provided with cylindrical bearing members (50, 51) for the piston rod (15) and a rotary driving shaft (21) for coupling to a valve. The scotch-yoke form of conversion mechanism shown includes cylindrical bearing members (54) on pins (17) carried by the piston rod and engageable with the yokes (18). A thrust bearing member (68) is disposed between one end of a compression coil spring (24) (for returning the piston and pistod rod) and a box cover (45) and/or between the other end of the spring and a spring holder (25). <IMAGE>
Description
SPECIFICATION
Valve driving apparatus
The present invention relates to a valve driving apparatus provided on a valve such as a ball valve, butterfly valve, plug valve, gate valve, etc. and adapted to cause a valve stem to be rotated to thereby open and shut the valve.
There have heretofore been known two kinds of valve driving apparatuses, one of which is a doubleacting cylinder type (including a double-acting twocylinder type) valve driving apparatus utilising as a power source a gas such as compressed and pressurised air, nitrogen, etc. or a liquid such as pressurised air, nitrogen, etc. or a liquid such as pressurised oil etc. (hereinafter referred to totally as "pressurised fluid") and the other of which is a spring-return type valve driving apparatus provided with a reciprocating cylinder and a compression coil spring extended to thereby cause a piston to be moved to the original position by means of its restoring force after being compressed by the action of the reciprocating cylinder.The apparatus of either type is provided with a movement conversiontransmission mechanism for converting the reciprocating movement of a piston rod within the cylinder into a rotating movement and at the same time transmitting the rotating movement to a driving shaft provided on the valve stem.
In the continuously reciprocating movements of the piston and the piston rod of the valve driving apparatus, there gives rise to an adverse phenomenon that the piston rod itself is given a rotating movement relative to the center axis thereof due to an eddy current of the pressurised fluid introduced into the cylinder or frictional displacements in bearing portions for the piston rod or, in the case of the spring-return type valve driving apparatus, due to a twisting action of the compression coil spring to be compressed and extended.Particularly when a scotch yoke type movement conversiontransmission mechanism is used and openings of the scotch yokes are disposed at right angles relative to the piston rod, the piston rod and pins fixed onto the piston rod are rotated in the direction of the width of the piston rod and, therefore, the parallel relation between the pins and the driving shaft of the valve driving apparatus cannot be maintained, with the result that the pins are out of engagement with the openings of the scotch yokes. Therefore, the associated movement between the piston rod and the scotch yokes cannot be obtained. This means that the valve driving apparatus cannot fulfill its function to precisely open and shut the valve.
In orderto prevent the aforementioned adverse phenomenon from occurring, there has heretofore been adopted means comprising a pair of grooves formed on the inner surface of a case proper of the valve driving apparatus in parallel with the piston rod for allowing the extremeties of a pair of elongated pins to be inserted and held therein, whereby the rotating force of the piston rod is absorbed, or means comprising a pair of plane surfaces formed on the fixing portions between the piston rod and
the pins and inserted between yoke portions pro
vided on the driving shaft.
In the case of the spring-return type valve driving
apparatus, the movement and force produced by the
cylinder must cause the driving shaft to be rotated
and the compression coil spring to be compressed.
Therefore, the force for rotating the valve stem is
reduced by the force for compressing the compress
ion coil spring to an extent about one half of the
force for rotating the valve stem required in the case
of the double-acting cylinder type valve driving
apparatus.
Under these circumstances, it has heretofore been
necessary to prepare a plurality of valve driving
apparatuses in advance and to select one of the
prepared valve driving apparatuses in accordance
with the driving force required by the valve to be
driven.
The conventionally known valve driving apparatus
of a double-acting cylinder type has disadvantages
in that a continuous reciprocating movement of the
piston of the cylinder and a continuous rotating movement of the driving shaft give wear to the
bearing portions for the piston rod and for the
driving shaft, with the result that the replacement of
the bearing portions with new ones is required in a
comparatively short period of time, and in that use of
the apparatus for a long period of time reduces the
driving efficiency due to rust gathered on the inner
wall of the cylinder, high frictional resistance between
the cylinder and the piston and, in the utilisation of
the scotch yoke type movement conversion
transmission mechanism, due to high frictional
resistance between the pins and scotch yokes.
On the other hand, in the conventionally known
valve driving apparatus of a spring-return type,
continuous compression and extension of the com
pression coil spring disposed inside the apparatus
gives rise to a phenomenon of relative displace
ments in the rotating direction between the both
ends of the compression coil spring and the both
ends-receiving portions and further gives rise to a
twisting phenomenon of the compression coil spring
which phenomena are unavoidable characteristic
features the compression coil spring has by nature.
Assuming that one end of the compression coil
spring and the one end-receiving portion are in a
state wherein these cannot easily be slid on each
other, the other end of the compression coil spring is
given a rotating movement which is transmitted to a
spring holder fixed to the piston rod. That is to say,
the rotating movement of the spring holder is
transmitted to the piston rod and further to the
piston. This will cause some possibility of the
movement conversion-transmission mechanism dis
posed between the piston rod and the driving shaft
being given an inconvenient movement or force,
such as causing disengagement between the pins
and the scotch yokes in the scotch yoke type
movement conversion-transmission mechanism,
disengagement between the toothed wheels in a
combination rack and pinion type movement con
version-transmission mechanism, etc.However,
since such a movement conversion-transmission
mechanism has, in fact, a construction such that no such inconvenient movement is made though such inconvenient force is exerted on the movement conversion-transmission mechanism, attention to the aforementioned unavoidable phenomena must be paid. That is to say, the conventionally known valve driving apparatus of a spring-return type has disadvantages in that there occur displacement and friction between the both ends of the compression coil spring and the both ends-receiving portions within the apparatus to thereby give rise to energy loss, damage and wear, in that the rotating action of the valve stem may possibly be obstructed and in that the apparatus cannot be used precisely and stably for a long period of time for these reasons.
In accordance with the present invention, a valve driving apparatus comprises a case proper provided in the interior thereof with a movement conversiontransmission mechanism; a cylinder mechanism freely detachably fixed to one end of said case proper and including a cylinder possessed of ports serving as inlet and outlet for a pressurised fluid, a piston disposed inside said cylinder and a piston rod fixed to said piston so as to produce a given output; a piston rod supporting mechanism freely detachably fixed to the other end of said case proper; said movement conversion-transmission mechanism serving to convert the reciprocating movement of said piston into a rotating movement and simultaneously transmit the rotating movement to a driving shaft connected to a valve stem; and bearing portions provided near the junctions of said cylinder mechanism and said case proper, and said case proper and said piston rod supporting mechanism, for supporting said piston rod and further provided on said driving shaft for supporting said driving shaft.
Advantages of the present invention are that the valve driving apparatus:
is capable of easy modification for driving any kind of valve irrespective of the magnitude of the driving force required by the valve to be driven;
has a simple construction capable of causing the valve to be opened and shut precisely and stably;
is capable of solving the problem of wear of the bearing portions for the piston rod and for the driving shaft;
is capable of having its driving efficiency enhanced by reducing frictional resistance in a scotch yoke type movement conversion-transmission mechanism;
is capable of providing excellent durability and corrosion-proofness; and
is capable of solving the problems of wear, energy loss and damage caused by displacement and friction of the ends of a compression coil spring in apparatus of the spring-return type.
Preferably, the valve driving apparatus is provided with cylindrical bearing members possessed of the same shape and diameter and located by said bearing portions for said piston rod and said bearing portions for said driving shaft, said-cylindrical bearing members for said piston rod and for said driving shaft being replaceable with each other due to the difference in weartherebetween;
other cylindrical bearing members made of the same material as the aforementioned cylindrical bearing members and attached to both pins in the case of a scotch yoke type movement conversiontransmission mechanism so as to reduce the frictional resistance between the pins and the scotch yokes;;
a lining member made of a synthetic resin and applied to the inner wall of the cylinder mechanism and a resilient member such as of synthetic rubber embedded in a groove formed on the circumference of the piston to thereby enhance the durability and corrosion-proofness of the apparatus; and
at least one cylindrical thrust bearing member disposed on the portions for receiving the ends of a compression coil spring in the case of a springreturn type valve driving apparatus so as to reduce the frictional resistance between the-ends of the compression coil spring and the end-receiving portions within the apparatus.
Examples of valve driving apparatus according to the present invention will now be described with reference to the accompanying drawings in which:
Figure lisa partially cutaway longitudinal cross section illustrating the principal portion of one existing valve driving apparatus.
Figure 2 is a partially cutaway longitudinal cross section of the principal portion of another existing valve driving apparatus.
Figure 3 is a partially cutaway longitudinal cross section ofthe principal portion of still another existing valve driving apparatus.
Figure 4 is a lateral cross section illustrating one embodiment of the valve driving apparatus according to the present invention.
Figure 5 is a lateral cross section illustrating another embodiment of the valve driving apparatus according to the present invention.
Figure 6 is a lateral cross section illustrating still another embodiment of the valve driving apparatus according to the present invention.
Figure 7 is a partially cutaway enlarged front view of the valve driving apparatus shown in Figure 4.
Figure 8 is a partially cutaway longitudinal cross section illustrating the principal portion of the valve driving apparatus shown in Figure 4, 5 or 6.
Figure 9 is a partially cutaway plan view of Figure 8.
Figure 10 is an enlarged cross section taken along the line Ill-Ill in Figure 4 or 6.
Figure 11 is a longitudinal cross-section illustrating a cylinder-operation type gate valve on which the valve driving apparatus of the present invention may be provided.
Figure 12 is a partially cutaway plan view illustrating a butterfly valve on which the valve driving apparatus of the present invention may be provided.
Figure 13 is a lateral cross section illustrating a further embodiment of the valve driving apparatus according to the present invention.
Figure 14 is a lateral cross section illustrating a still further embodiment of the valve driving appratus according to the present invention.
Figure 15 is a partially cutaway front view of
Figure 14.
When a scotch yoke type movement conversion transmission mechanism is used and openings of the scotch yokes are disposed at right angles relative to the piston rod 1, the piston rod and pins 10 fixed on the piston rod are rotated in the direction of the
width of the piston rod as illustrated in Figure 1 and,
therefore, the parallel relation between the pins and the driving shaft 8 of the valve driving apparatus
cannot be maintained, with the result that the pins
are out of engagement with the openings of the
scotch yokes. Therefore, the associated movement
between the piston rod 1 and the scotch yokes
cannot be obtained. This means that the valve
driving apparatus cannot fulfill its function to pre
cisely open and shut the valve.In order to prevent
the aforementioned adverse phenomenon from occurring, there has heretofore been adopted means
comprising a pair of grooves 4,4 formed on the
inner surface of a case proper 3 of the valve driving
apparatus in parallel with the piston rod 1 for
allowing the extremities of a pair of elongated pins 2,
2 to be inserted and held therein, whereby the
rotating force of the piston rod is absorbed (Figure
2), or means comprising a pair of plane surfaces 7,7
formed on the fixing portions between the piston rod
6 and the pins 5,5 and inserted between yoke
portions 9 provided on the driving shaft 8, whereby
the rotation of the piston rod is prevented (Figure 3).
Now, the present invention will be described
hereinafter in full detail with reference to the accom
panying drawings.
Figure 4 is a lateral cross section illustrating one
embodiment of the valve driving apparatus accord
ing to the present invention which apparatus is of a
double-acting cylinder type utilising a pair of scotch
yokes as a movement conversion-transmission
mechanism. The valve driving apparatus comprises
a case proper 26, a cylinder mechanism 34 freely
detachably fixed to a flange portion 48 of the case
proper with bolts 35 and a stopper member 38 as a
piston rod supporting mechanism 33 freely detach
ably fixed to a fitting portion 36 of the case proper
with bolts 39.The cylinder mechanism 34 comprises
a cylinder 11 having ports 12, 13 serving as inlet and
outlet for a pressurised fluid, a piston 14 disposed
inside the cylinder and a piston rod 15 fixed to the
piston by means of a nut 16 so that it may be moved
in the rightward and leftward directions in conjunc
tion with the piston. The piston rod 15 is movably
supported by bearing portions 27, 28. The piston 14
shown in Figure 4 is in a state wherein it has reached
the rightward extremity of its moving range. When a
pressurised fluid is introduced from the port 13 into
the cylinder 11, the piston in such a state is moved in
the leftward direction.Thereafter, when a pressu
rised fluid is introduced from the port 12 into the
cylinder 11, the piston is moved in the rightward
direction, with the result that the fluid introduced
from the port 13 into the cylinder is discharged out of
the cylinder from the port 13 since it has lost its
pressurised state by the action of a switch valve (not
shown) connected to the ports 12, 13. The cylinder
mechanism as constructed above is capable of
producing a given output. The stopper member 38
as the piston rod supporting mechanism 33 is
provided with a stopper 37.The case proper 26 is
provided in the interior thereof with a movement
conversion-transmission mechanism 30 for converting the reciprocating movement of the piston rod into a rotating movement to a driving shaft 21
mounted on a valve stem (not shown) of a valve to
be driven.
Since the valve driving apparatus according to the
present invention has such a construction that the case proper and the stopper member are freely detachably fixed to each other, there can be pro vided a spring-return type valve driving apparatus,
as illustrated in another embodiment of Figure 5,
merely by replacing the stopper member 38 with a spring box 43 as the piston rod supporting mechan
ism 33 or, as occasion demands, a double-acting two-cylinder type valve driving apparatus (not
shown) merely by substituting another cylinder mechanism capable of functioning in the same
manner as the cylinder mechanism 34 for the stopper member 38.In the embodiment of Figure 5, the spring box 43 accommodates therein a com
pression coil spring 24 and is freely detachably fixed to the fitting portion 36 of the case proper 26 with
bolts 44 and is possessed of a spring holder 25 fixed to the piston rod and a box cover 45 on which a stopper 46 is provided.
In-comparison between the valve driving appar
atuses shown in Figures 4 and 5, since the magnitudes of the outputs produced by the respective
cylinders are the same and since the output pro
duced by the cylinder of Figure 5 is absorbed by the
compression coil spring 24, the valve-driving force
of the apparatus of Figure 5 is reduced by the output
absorbed by the compression coil spring. Therefore, the apparatus of Figure 5 cannot be used for the
valve capable of being fully driven by the apparatus
of Figure 4.However, since the valve driving appar
atus has such a construction that the case proper 26
and the cylinder mechanism 34 are freely detachably fixed to each other, the valve fully driven by the
apparatus of Figure 4 can be driven in the same
manner by replacing the cylinder mechanism 34 with another cylinder mechanism 34' having a cylinder 40 shown in still another embodiment of
Figure 6 which cylinder has a larger inner diameter than that of the cylinder 11 so as to produce a higher
output than that of the cylinder 11 by the output
absorbed by the compression coil spring 24.
The cylinder mechanism 34' of this embodiment
comprises a cylinder 40 having ports 12, 13 for inlet
and outlet for a pressurised fluid, a piston 41
disposed inside the cylinder and a piston rod 15 'fixed to the piston and is freely detachably fixed at the flange portion 47 thereof to the flange portion 48 of the case proper 26 with bolts 35 and, therefore, it
produces a higher output than that of the cylinder
mechanism 34 of the embodiment of Figure 5 and can function in the same manner as the cylinder
mechanism 34.
As is clear from the above, the valve driving apparatus according to the present invention can be
used as any type of apparatus such as an apparatus of a double-acting cylinder type, an apparatus of a spring-return type or an apparatus of a doubleacting two-cylindertype and can be utilised for any valve merely by suitably selectively using the mechanisms between which the case proper intervenes.
The movement conversion-transmission mechanism 30 shown in Figure 4, 5 or 6 comprises a pair of pins 17,17 provided on the piston rod 15; a pair of scotch yokes 18, 18 each having yoke portions 20,20 and an opening 19 enclosed buy a pair of opposed sliding surfaces 23, 23 and a thrusting surface 22; and a key 29. The pin 17 is engaged with the opening 19. The mechanism 30 causes the scotch yokes 18 to be swung relative to the driving shaft 21 connected to the valve stem (not shown) by causing the pins 17, 17 to be slid on the sliding surfaces 23 in conjunction with the reciprocating movement of the piston rod 15.When the openings 19, 19 of the scotch yokes are disposed at right angles relative to the piston rod, as shown in Figure 8 or 9, the peripheral surfaces of the pins 17, 17 are also brought into thrust contact with the thrusting surfaces 22, 22 formed in the axial direction of the driving shaft 21. When the openings are disposed aslant relative to the-piston rod 15, as shown in Figure 4, 5 or 6, the pins 17, 17 are just brought into sliding contact with the sliding surfaces 23. Since the width of the opening 19 is substantially the same as the diameter of the pin 17 to an extent capable of causing the pin to be slid on the sliding surfaces of the scotch yoke, the piston rod 15 is prevented from being rotated. The pins are thus maintained at a parallel relation to the driving shaft 21 at all times.Therefore, not only the drive of the pins 17 and the scotch yokes 18 but also the drive of the piston 14 and the spring holder 25 is precisely transmitted to the driving shaft 21 and, moreover, a valve can exactly be rotated by ninety degrees through the medium of the valve stem (not shown) connected with the driving shaft.
Since the pins provided on the piston rod are held in parallel with the driving shaft at all times, as described above, the valve can be rotated precisely and stably through the medium of the valve stem connected to the driving shaft and, at the same time, there is no danger that any part is damaged due to a considerably simpler construction than that of any existing valve driving apparatus. That is to say, the durability ofthe valve driving apparatus is conspicuously prolonged and the mass production of the valve driving apparatuses can be effected at low expenses.
Although the scotch yokes are used as the movement conversion-transmission mechanism in all the embodiments of the present invention, it goes without saying that there may selectively be adopted a link mechanism our a combination rack and pinion mechanism.
Since the bearing portions 27, 28 support the reciprocating movementBof the piston rod 15, whereas bearing portions 49,49 support the rotating movement of the driving shaft 21, the pressure exerted on the former bearing portions and that exerted on the latter bearing portions are different from each other and, therefore, repetitive reciprocating and rotating movements give wear to the bearing portions in different sections. In view of this fact, attention has been paid to use of cylindrical bearing members which are identical in material, shape and diameter. Into the bearing portions 27, 28 for the piston rod 15 and the bearing portions 49,49 for the driving shaft 21, cylindrical bearing members 50,51,52 and 53 made of a synthetic resin or a copper alloy and formed in the same shape and diameter are inserted respectively.
T'o be more specific, the-cylindrical bearing members protect the bearing portions from wear and at the same time can be replaced with each other since these are formed in the same material, shape and diameter in view of the difference in wear between the cylindrical bearing members which difference is made due to different movements between the piston rod and the driving shaft. After use of the apparatus for some period of time in a state wherein the cylindrical bearing members 50, 51 are used for the piston rod 15 and the cylindrical bearing members 52,53 are used for the driving shaft 21, the members 50, 51 can be used for the driving shaft 21 and the members 52,53 can be used for the piston rod 15 because of the aforementioned difference in wear therebetween.This replacement brings about substantially the same function and effect as in the case of replacement of these cylindrical bearing members with new ones. Use of these cylindrical bearing members, thus, makes the apparatus excellent in durability and economisation and enhances the driving efficiency of the apparatus since the apparatus attains its function smoothly and precisely for a long period of time.
Now, a valve driving apparatus using a scotch yoke type movement conversion-transmission mechanism has been considered. Since the openings 19 ofthe scotch yokes 18 and the pins 17 are engaged with each other, problems on wear and damage may possibly be raised. In consideration of these problems, cylindrical bearing members 54 made of a synthetic resin or a copper alloy are rotatably provided on the pins 17 through the medium of bearing portions 55.Use of the cylindrical bearing members can reduce the frictional resistance between the scotch yokes and the pins even at either the time the pins are sliding on the sliding surfaces 23 of the scotch yokes 18 or the time the pins are brought into thrust contact with the thrusting surfaces 22 when the openings 19 are disposed at right angles relative to the piston rod 15 and, therefore, can further enhance the driving efficiency of the apparatus.
Figure 11 is a longitudinal cross section of a cylinder-operation type gate valve. In the Figure, reference numeral 56 is a gate valve and denoted by 57 is a valve body of the gate valve. Figure 12 is a partially cutaway plan view of a butterfly valve 58, in which reference numeral 59 is a driving shaft connected with a valve stem of the butterfly valve, 60 a rotating member installed on the driving shaft 59 and 61 a supporting plate for pivotally supporting the apparatus proper.
Since a valve driving apparatus utilises the reciprocating movement of a piston, the piston is required to smoothly move within the apparatus. The present invention also provides a valve driving apparatus wherein the inner wall of the cylinder mechanism 34 is coated with a lining member 63 of low frictional resistance made such as of a synthetic resin and the piston 14 is provided on the peripheral surface thereof with an annular groove 64 filled with an annular resilient member 65 of low frictional resistance made such as of a synthetic rubber, synthetic resin, etc. so that the resilient member is slid on the lining member.The coat of the inner wall of the cylinder mechanism 34 with the lining member prevents rust from being gathered and, in conjunction with the resilient member, not only prevents damage and wear due to its own resilience but also reduces frictional resistance therebetween.
Therefore, the present invention provides a valve driving apparatus excellent in durability, corrosionproofness and driving efficiency.
Returning to Figures 5 and 6, the compression coil spring 24 is compressed and extended in the range of the length Lwhen the piston rod 15 reciprocates for the purpose of transmitting to the driving shaft 21 the rotating movement converted from the reciprocating movement. In the movement of the compression coil spring in the range of the length L relative displacements in the rotating movement are produced between the both ends of the compression coil spring 24 and the both ends-receiving portions 66,67 within the spring box 43 and then a twisting phenomenon of the compression coil spring occurs.
In view of such phenomena, the present invention
provides a valve driving apparatus wherein one or two cylindrical thrust bearing members 68 such as a
metallic plate coated with a tetrafluoroethylene resin, oil-containing sintered metallic plate, copper alloy plate, etc. are disposed between one end of the compression coil spring and the box cover 45 and/or
between the other end of the compression coil spring and the spring holder 25. According to the
present invention, therefore, the twisting phenome
non, friction resulting from such phenomenon and wear due to such friction can fully be prevented, with the result that both the conversion of the reciprocat
ing movement into the rotating movement within the valve driving apparatus and the open-shut
operation of the valve can precisely be effected.
As described above, the present invention pro
vides considerably useful valve driving apparatuses
from a practical point of view and, therefore, contri
butes greatly to this field.
Claims (11)
1. Avalve driving apparatus comprising a case
proper provided in the interior thereof with a
movement conversion-transmission mechanism; a
cylinder mechanism freely detachably fixed to one
end of said case proper and including a cylinder
possessed of ports serving as inlet and outlet for a
pressurised fluid, a piston disposed inside said
cylinder and a piston rod fixed to said piston so as to
produce a given output; a piston rod supporting
mechanism freely detchably fixed to the other end of
said case proper; said movement conversion
transmission mechanism serving to convert the
reciprocating movement of said piston into a rotat
ing movement and simultaneously transmit the
rotating movement to a driving shaft connected to a
valve stem;-andbearing portions provided near the junctions of said cylinder mechanism and said case
proper, and said case proper and said piston rod
supporting mechanism, for supporting said piston rod and further provided on said-driving shaft for
supporting said driving haft.
2. A valve driving apparatus according to Claim 1, wherein said movementconversion-transmission mechanism is of a scotch yoke type and comprises a
pair of pins provided on said piston rod; a pair of
scotch yokes each including a pair of opposed
sliding surfaces and a thrust surface so as to form an
opening for allowing a respective one of said pins to beengagedtherewith; and dne or more keys for
fixing said pair of scotch yokes to said driving shaft;;
said-pair of pins being brought into sliding contact
with said sliding surfaces when said openings are
disposed aslant relative to said piston rod and, when
said openings are disposed at right angles relative to - said piston rod, being brought into thrust contact
with said thrust surfaces while maintaining the
contact with said sliding surfaces, so as to constantly
maintain parallel relation between said driving
shaft and said pair of pins, whereby the valve is
precisely and stably driven.
3. A valve driving apparatus according to Claim
2, further comprising a pair of cylindrical bearing
members attached to the peripheral surfaces of said
pair of pins and rotatably supported by respective
bearing portions.
-
4. A valve driving apparatus according to any
preceding claim, further comprising cylindrical bear
ing members possessed of the same shape and
diameter and located by said bearing portions for
said piston rod and said bearing portions for said
driving shaft, said cylindrical bearing members for
said piston rod and for said driving shaft being
replaceable with each other due to the difference in
wear therebetween.
5. A valve driving apparatus according to any
preceding claim, wherein said cylinder mechanism
has an inner wall thereof coated with a lining
member of a synthetic resin, and said piston is
provided on the periphery thereof with a groove and
in said groove with a resilient member so that said
resilient member is slid on said lining member.
6. A valve driving apparatus according to any
preceding claim, wherein said piston rod supporting
mechanism is a stopper member having a stopper;
or a spring box comprising a compression coil
spring accommodated therein, a box cover, a stop
per provided on said box cover and a spring holder;
or a cylinder mechanism of the same type as said
cylinder mechanism so as to constitute any one of
the valve driving apparatuses of a double-acting
cylinder type, a spring-return type and a double
acting two-cylinder type.
7. A valve driving apparatus according to Claim
6, further comprising a cylindrical thrust bearing
member which is a metal plate coated with a
tetrafluoroethylene resin, an oil-containing sintered
metal plate or a copper alloy plate, and which is
provided either between one end of said compress
ion coil spring and said box cover, or between the other end of said compression coil spring and said spring holder, or is provided both between one end of said compression coil spring and said box cover and between the other end of said compression coil spring and said spring holder.
8. A valve driving apparatus according to Claim 1 and substantially as hereinbefore described with reference primarily to any one of Figures 4,5,6,13 or 14, of the accompanying drawings.
9. A valve driving apparatus comprising a case proper provided in the interior thereof with a movement transmission, or conversiontransmission, mechanism; a cylinder mechanism freely detachably fixed to one end of said case proper and including a cylinder possessed of ports serving as inlet and outlet for a pressurised fluid, a piston disposed inside said cylinder and a piston rod fixed to said piston so as to produce a given output; a piston rod supporting mechanism freely detachably fixed to the other end of said case proper.
10. Avalve driving apparatus according to Claim 9, wherein said cylinder mechanism has an inner wall thereof coated with a lining member of a synthetic resin, and said piston is provided on the periphery thereof with a groove and in said groove with a resilient member so that said resilient member is slid on said lining member.
11. A valve driving apparatus according to Claim 9 or Claim 10, wherein a movement conversiontransmission mechanism is provided, which serves to convert the reciprocating movement of said piston into a rotating movement and simljitaneously transmit the rotating movement to a driving shaft connected to a valve stem.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979078108U JPS6214461Y2 (en) | 1979-06-08 | 1979-06-08 | |
| JP7811179U JPS55177572U (en) | 1979-06-08 | 1979-06-08 | |
| JP1979078109U JPS6141011Y2 (en) | 1979-06-08 | 1979-06-08 | |
| JP1979078107U JPS594217Y2 (en) | 1979-06-08 | 1979-06-08 | valve drive device |
| JP7811079U JPS55177504U (en) | 1979-06-08 | 1979-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2056565A true GB2056565A (en) | 1981-03-18 |
| GB2056565B GB2056565B (en) | 1983-11-02 |
Family
ID=27524707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8018235A Expired GB2056565B (en) | 1979-06-08 | 1980-06-04 | Valve driving fluid operated actuator |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2056565B (en) |
| IT (1) | IT1131525B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0203426A1 (en) * | 1985-05-07 | 1986-12-03 | Norsk Hydro A/S | Actuator for transmission of a rectilinear motion to a rotating motion |
| GB2182721A (en) * | 1985-11-09 | 1987-05-20 | Hytork Actuators Ltd | Improvements in or relating to fluid-pressure-operated actuators |
| US4702150A (en) * | 1985-06-21 | 1987-10-27 | Kitz Corporation | Spring-return type actuator |
| WO2001042695A1 (en) * | 1999-12-08 | 2001-06-14 | Ring-O-Valve Norge As | A ball valve device |
| CN101858459A (en) * | 2010-06-22 | 2010-10-13 | 季忠庸 | Ready-package pneumatic actuator |
| CN101881352A (en) * | 2010-06-22 | 2010-11-10 | 季忠庸 | Pneumatic actuator |
| CN107250565A (en) * | 2014-12-01 | 2017-10-13 | 罗托克流体系统有限责任公司 | Valve actuator equipment with the actuating arm with modular construction |
-
1980
- 1980-06-04 GB GB8018235A patent/GB2056565B/en not_active Expired
- 1980-06-06 IT IT8022642A patent/IT1131525B/en active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0203426A1 (en) * | 1985-05-07 | 1986-12-03 | Norsk Hydro A/S | Actuator for transmission of a rectilinear motion to a rotating motion |
| US4702150A (en) * | 1985-06-21 | 1987-10-27 | Kitz Corporation | Spring-return type actuator |
| AU572720B2 (en) * | 1985-06-21 | 1988-05-12 | Kitz Corp. | Spring return rotary valve actuator |
| GB2182721A (en) * | 1985-11-09 | 1987-05-20 | Hytork Actuators Ltd | Improvements in or relating to fluid-pressure-operated actuators |
| WO2001042695A1 (en) * | 1999-12-08 | 2001-06-14 | Ring-O-Valve Norge As | A ball valve device |
| CN101858459A (en) * | 2010-06-22 | 2010-10-13 | 季忠庸 | Ready-package pneumatic actuator |
| CN101881352A (en) * | 2010-06-22 | 2010-11-10 | 季忠庸 | Pneumatic actuator |
| CN107250565A (en) * | 2014-12-01 | 2017-10-13 | 罗托克流体系统有限责任公司 | Valve actuator equipment with the actuating arm with modular construction |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8022642A0 (en) | 1980-06-06 |
| IT1131525B (en) | 1986-06-25 |
| GB2056565B (en) | 1983-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960604 |