Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K41/00—Spindle sealings
  • F16K41/006—Spindle sealings by establishing an under-pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K41/00—Spindle sealings
  • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K41/00—Spindle sealings
  • F16K41/003—Spindle sealings by fluid
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K41/00—Spindle sealings
  • F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
  • F16K41/04—Spindle sealings with stuffing-box ; Sealing rings with at least one ring of rubber or like material between spindle and housing

Definitions

• This invention relates to a valve and particularly to a solution for preventing leaking of a shaft seal of a valve.
• An object of this invention is to solve the above problem and to provide a valve of a new type, with which fluid can be efficiently prevented from leaking into the surroundings without significant additional costs. This object is achieved with a valve according to independent claim 1.
• the invention utilizes a suction channel whose first end removes fluid having flown to the shaft sealing arrangement and whose second end opens to the flow channel of the valve. A need for recovering fluid having ended up in the suction channel for further treatment can be avoided because this fluid can be conducted to the flow channel of the valve, where it is mixed with corresponding fluid flowing in the flow channel.
• Figure 1 shows a first embodiment of a valve
• Figure 2 shows a second embodiment of a valve
• Figures 3 and 4 show a third embodiment of a valve
• Figure 5 shows a fourth embodiment of a valve
• Figure 6 shows a fifth embodiment of a valve
• Figure 7 shows a sixth embodiment of a valve
• Figure 8 shows a seventh embodiment of the valve.
• Figure 1 shows a first embodiment of a valve.
• a valve 1 in Figure 1 is a linear poppet valve, a shut-off member 5 being arranged in a flow channel 4 connecting the inlet opening 2 and outlet opening 3 of the poppet valve.
• a shaft 6 protrudes via which the shut-off member 5 can be moved in the flow channel 4.
• the shut-off member 5 can be moved for instance by means of an actuator (not shown in the figure) in the longitudinal, i.e. vertical, direction of the shaft 6 in Figure 1.
• an actuator not shown in the figure
• the shut-off member 5 throttles the flow connection between the inlet opening 2 and the outlet opening 3, and correspondingly, when moving upwards, it opens the flow connection.
• valve 1 is provided with a shaft sealing arrangement comprising sealing points arranged on both sides of the first end 11 of a suction duct 10. If, deviating from the case of Figure 1 , the first end 11 of the suction channel comprises several openings, all these openings are arranged between the above-mentioned sealing points.
• the sealing points have a first shaft seal 7 and correspondingly a second shaft seal 8.
• shaft seal is to be understood broadly to cover all flow restrictors which make it possible to restrict flowing of fluid from the flow channel in the direction of the shaft towards the valve surroundings as well as flowing of air from the surroundings towards the flow channel and the first end of the suction channel.
• the example of Figure 1 has a space 9 shaped between the first and the second shaft seal 7 and 8, the first end 11 of the suction channel 10 opening to this space.
• the second end of the suction channel 10 is arranged to open to the area of rapid flow or low pressure in the flow channel 4 of the valve 1. Arranged at such a point, the fluid flowing through the flow channel 4 generates the required suction to remove the fluid having leaked into the space 9. At the same time, the leaked fluid can be returned to the flow channel and no special arrangements are needed to recover it.
• the second end 12 of the suction channel should be arranged at a point where the pressure is lower than pressure P1. This ensures an efficient shaft sealing arrangement. However, if the second end 12 of the suction channel can be arranged in the area where the pressure is lower than pressure P3 in the surroundings of the valve, the shaft sealing arrangement is even more efficient.
• the second end 12 of the suction channel 10 is arranged to open in a flow channel 4 to a point where the shut-off member 5 restricts the cross-sectional area of the flow channel 4.
• the second end 12 opens, seen in the flow direction, after the throttle point of the shut-off member, where the prevailing pressure is lower than pressure P1 at the inlet opening 2.
• the suction channel 10 is an internal channel of the valve 1 , shaped in the shut-off member 5 and shaft 6 of the valve.
• the fluid flowing in the flow channel 4 generates underpressure in the suction channel 10; in other words, the pressure at the point to which the first end 11 opens is higher than the pressure at the point to which the second end 12 opens.
• a leak alarm can be triggered when it is observed in the pressure measurement that the pressure between the sealing points 7 and 8 is higher than or the same as pressure P3 in the surroundings of the valve.
• a sensor or sensors in the space 9 between the sealing points 7 and 8 or in the suction channel 11 , for example to measure flow or particle contents. Material flow or detection of harmful substances, for example, in the suction channel 11 or space 9 may be interpreted as leakage over the sealing point 7, and on the basis of this, maintenance acts can be planned and started.
• Figure 2 shows a second embodiment of a valve.
• the embodiment of Figure 2 corresponds, to a great extent, to the embodiment of Figure 1 , due to which the embodiment of Figure 2 is described in the following primarily by bringing forth differences between these embodiments.
• a valve 1 ' is a control valve whose shut-off member 5' can be moved in the flow channel 4 between the inlet opening 2 and the outlet opening 3 by rotating the shut-off member 5' by means of a shaft 6' protruding from it. Depending on the direction of rotation, the flow path from the inlet opening 2 to the outlet opening 3 is either throttled or opened.
• the shut-off member 5' comprises a main opening 13, through which most of the flowing fluid proceeds towards the outlet opening 3.
• the shut-off member 5' is also provided with a channel which has a smaller size than the main opening 13 and which also forms a portion 14 in the flow channel 4.
• This smaller channel 14 opens, at its end 15 closer to the outlet opening 3, to the point of the flow channel 4 where the cross-sectional area of the flow channel 4 is larger than the total cross-sectional area of the main opening 13 and the smaller channel.
• the end 15 of the portion 14 is positioned after the throttle point in the flow channel.
• the second end 12 of a suction channel 10' is arranged to open to the vicinity of the end 15 of the portion 14 in the flow channel 4. Owing to such a structure, the fluid flowing in the flow channel 4 generates an underpressure in the suction channel 10'.
• the suction channel 10' in the embodiment of Figure 2 is a channel internal to the valve 1', shaped in the frame 16 of the valve 1 '.
• the frame 16 means those parts of the valve which together enclose the flow channel and the shut-off member.
• Figures 3 and 4 show a third embodiment of a valve, which corresponds, to a great extent, to the embodiment of Figure 1 , due to which the embodiment of Figures 3 and 4 is described in the following primarily by bringing forth differences between these embodiments.
• Figure 3 is a side section view of the valve
• Figure 4 is a section along line IV-IV of Figure 3.
• a valve 1" is a control valve whose shut-off member 5" can be moved in the flow channel 4 between the inlet opening 2 and the outlet opening 3 by rotating the shut-off member 5" by means of a shaft 6' protruding from it. Depending on the direction of rotation, the flow path from the inlet opening 2 to the outlet opening 3 is either throttled or opened.
• a suction channel 10" whose first end 11 is arranged to open to the space 9 between the first and the second shaft seal 7 and 8 is not a channel internal to the valve 1".
• the suction channel 10" protrudes from the valve frame and continues as an external tube or hose from point A of Figure 3.
• the tube or hose is connected to the frame of the valve 1 " at point A in Figure 4. From point A of Figure 4, the suction channel 10" continues through the frame in such a way that its second end 12 opens to the area of rapid flow or low pressure in the flow channel 4.
• Figure 5 shows a fourth embodiment of a valve.
• Figure 5 shows a structure which is alternative to the structure of the top of the valve 1' in Figure 2.
• the flow restrictor comprises an area 22 permeating fluid.
• Such an area may be formed of, for example, holes formed through the flow restrictor.
• Figure 6 shows a fifth embodiment of a valve.
• the embodiment of Figure 6 corresponds, to a great extent, to the embodiment of Figure 5, due to which it is described in the following primarily by bringing forth differences between these embodiments.
• the shaft sealing arrangement comprises only one flow restrictor 20, which allows implementation of sealing at both flow points.
• the area 22 of the flow restrictor is made such that it permeates fluid sufficiently well so as to extend the suction effect around the shaft 6' both on the inner periphery and on the outer periphery of the flow restrictor 20. It is feasible to implement this for instance by making the area 22 of a sufficiently porous material.
• Figure 7 shows a sixth embodiment of a valve 100.
• the embodiment of Figure 7 corresponds, to a great extent, to the embodiment of Figure 1 , due to which the embodiment of Figure 7 is described in the following primarily by bringing forth differences between these embodiments.
• the flow direction is denoted as being opposite to the case of Figure 1.
• the flow direction itself is not, how- ever, relevant to the embodiment as far as suction from the inlet opening 2 to the outlet opening 3 can be generated in a suction channel 110.
• the point where the second end 12 of the suction channel 110 opens in the valve is not relevant to the embodiment either, but the shaping may be according to Figures 1 or 7 where the second end 12 opens in the shut-off member, or alternatively the shaping may be according to Figures 2 and 3 where the second end 12 opens at another point of the valve.
• the main thing is that the second end 12 of the suction channel opens to a point where the fluid flow generates suction in the suction channel 110.
• the suction channel 110 in the embodiment of Figure 7 does not cause suction merely in the sealing arrangement of the shaft.
• the suction channel 110 has been continued with one or more flow channels 130, which is/are connected to the suction channel in such a way that the flowing fluid generates suction also in these flow channels 130.
• the valve 100 comprises a connection 131 , for instance a tube connector with which an external tube can be connected to the suction channel 110 of the valve, for example via a shaft sealing arrangement, as shown in the example of Figure 7.
• the suction effect can be extended by means of channels 130 also to the shaft sealing arrangement of a second valve 140.
• this second valve there does not have to be shaping corresponding to that of the valve 100 to prevent leakage along the shaft 106 of the valve, but such leakage can be prevented by using in the second valve 140 a shaft sealing arrangement corresponding to the arrangements of one of the preceding embodiments and by sucking fluid out of this shaft sealing arrangement by means of the channels 130 and the suction channel 110.
• FIG 7 shows a seventh embodiment of the valve.
• a valve 200 of Figure 8 corresponds, to a great extent, to the valve 100 described in connection with the embodiment of Figure 7, due to which the embodiment of Figure 8 is described primarily by bringing forth differences between these embodiments.
• flanges 260 of the valve 200 are provided with seals 280 and an annular channel 290 corresponding to those of the sealing parts 170 in the embodiment of Figure 7.
• a channel system 230 with which suction is generated in the channels 290, is in this embodiment implemented with channels arranged inside the frame of the valve 200 and being connected, as in the embodiment of Figure 7, to the suction channel 210 of the valve 200.
• the shaft sealing arrangement is indicated as the connection point, the connection point may also be positioned at another point of the valve.
• FIG. 1 shows that the suction channel is formed in the shaft and the shut-off member
• the suction channel may, in the embodiment of Figure 1 , alternatively be implemented as a channel external to the valve in accordance with Figures 3 and 4.
• the external suction channel of Figures 3 and 4 or the suction channel arranged in the frame of Figure 2 can be replaced by a suction channel arranged inside the shaft and the shut-off member according to the embodiment of Figure 1.
• the sealing arrangement according to Figures 5 and 6 can also be implemented in the embodiments of Figures 1 and 3.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Lift Valve (AREA)
• Magnetically Actuated Valves (AREA)
• Electrically Driven Valve-Operating Means (AREA)
• Temperature-Responsive Valves (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38951608

Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (1)

Citations (7)

• 2007
  • 2007-12-14 FI FI20075913A patent/FI20075913L/sv not_active Application Discontinuation
• 2008
  • 2008-12-11 WO PCT/FI2008/050726 patent/WO2009077648A1/en not_active Ceased

Patent Citations (7)

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