US2260805A - Pump valve - Google Patents

Description

Oct. 28, 1941. A. J. GRANBERG 2,250,805

PUMP VALVE Filed Dec. 27, 1938 2 Sheets-Sheet 1 INVENTOR. ALBERT J GRA NBERG A TTORNEYS.

Oct. 28, 1941 A. J. GRANBERG PUMP VALVE FileH Dec. 2'7, 1938 2 Sheets-Sheet 2 INVENTOR ALBERT J GRANBER ATTORNEYS.

- struction'of FigsQI, llI, III.

Patented Oct. 28, 1941 PATENT OFFICE rom vanva Albert J. Granberg, Oakland, Cali, assignor to Granberg Equipment, Incorporated, Oakland, Calif., a corporation of California Application December 27, 1938, Serial No. 247,765

3 Claims.

My invention relates to pumps and more partlcularly to pressure relief and regulating means therefor. It is of particularapplication in con nection with pumps of the positive pressure rtary type.

An object of my invention is to provide improved means for enabling removal of pumping load from a prime mover, such as a gas engine, to facilitate starting such gas engine without resorting to a. clutch mechanism for the purpose.

It is another object of my invention to provide improved means for controlling the pressure developed by a p p- Another object of my invention is to provide improved means for enabling adjustment of pump operating pressures and pump output while pump is in operation.

Another object of my invention is to provide improved means for enabling variation in pump pressure and output at constant speed of operation.

It is a further object of my invention to enable adjustment of operating pressures and output in pumps of the positive pressure rotary type without necessitating, changing of the angle between the pump axes. 1

It is a further object of my invention to provide means for controlling. the maximum pressure developed by a pump.

. A further object ofmy invention is to provide I a maximum pressure control means for a pump of the positive pressurerotary type. which shall enable operation of such pump 'in either direction.

It is trarily adjusting the pressure characteristics of apump. t

Additional objects of .my inventionwill be brought out the following description 'of th'e 7 same taken in conjunction withthe accompanying drawings, Whereine 'Fig. 1' is a side elevational view of my inven tion, .mos tly in section taken substantially in the planes .indicated by the line 11 of Fig. 2.

- Fig. 2 is alviiew'in section taken along the line'lI,II of Fig. 1.

, v Fig. 3 is a vview in sectioniaiongthe' l in 111 n .ofFig.1.. V

Fig. 4 'is a view in perspective offthe consageway interconnecting the inlet andbutlet sides another object of my invention to provide .improved manually controlled. means for arbiof a pump, is normally maintained in a blocked or substantially blocked condition .by a valve, which in turn is made responsive tos'the pressure on the outlet side of the pump, to enlarge the capacity ,of the interconnecting passageway and relieve the pressure on that side of the pump, when-it has reached a predetermined value. The valve among other things is designed to be manually adjustable so that during operation, of the. pump, the interconnecting passageway normally may be entirely blocked or open to any desired extent, whereby the normally operating pressures of the pump may be adjusted anywhere from zero (fuILopening of the valve) to a'predetermined maximum (valve tightly closed). The construction enabling realization of the above results, embodies novel features which will be pointed out in detail by reference to the drawings, wherein the invention has been illustrated as embodied in a pump of the positive pressure rotary type, and more particularly an improved pump of this character forming the subject'matter of a co-pending application of mine, entitled fRotary'pump, Serial No, 162,579, filed September 7, 1937. The invention of the present application, in its broadest'aspect, .hasbeen disclosed'in my patent for Positive pressure rotary pump, No. 2,129,928 of September 13', 1938, but 'not claimed therein. it *A'pump casing l is preferably formed in" two halves to facilitate the machining of a phe ical inner surface 3. A driving head 5 having the shape 'of a spherical segment is positioned within'the chamber and has, extending outwardly therefrom, a driving shaft '1. This driving shaft is journaled in a casing bearing 9 close tothe pump chamber, and this casing bearing is p'ro-' longed to terminate '-ina 'stuflln'g' box'assembly comprising a. plunger I lforced against packing :13 by packing bolts-i5. The shaft continues,

and I prefer to steadythe outer end in anoutboard bearing I! mounted on a bracket l9.

Extending inwardly .into the" pump chamber from the driving'head 5 is a pump chamber partition 2| ---attache'd'.to a discoidal piston 23 by hinges 25. In like manner a second pumpcham- 7 her partition 21 isattached to discoidal piston 23 by similar hingespand the second partition extends across. the piston at right angles to-the to first partition. secondpartition "21- is at"- tach'ed toa driven head29,.alsohav ing the shape of a; spherical segment, and extending from the 'drivenheadisastub'shaftfl. Y

The stub shaft 3| has its free end supported in abearing I3 at an 'ang le. to the main drive shaft 7 width of bearing surface 'around the disc, and

this bearing surface is of course a spherical surface so that the disc may both oscillate and rotate within the casing. Four portions of the periphery deviate to 'form semicircular valve faces 53, each alternate surface extending in the opposite direction so that as the piston is rotated, each port 39 and II is opened into a chamber which is on an opposite side of the disc, and the fact that the peripherymakes these semicircular divergences allows me to place hinge pins such as shown at 5| in houses 53 formed integral with the disc in diametrical locations and at right angles to each other, to form the main bearings of the toggle connecting the driving and driven head. Thus, the device may be easily assembled and disassembled when the split casing is separated by taking out the bolts 55.

The pump casing I is formed with a channel 51 on either side thereof extending toward and terminating in an opening 59 at the rear of the pump, considering the drive shaft end of the pump as the front end. Each of the aforementioned channels is connected by one of the valve openings 39, 4| through the spherical pump chamber wall, with the interior of the pump, and is also provided with an opening ildirected through and out of the pump casing, laterally thereof. Depending on the direction of rotation of the pump, each of these-channels 51 will consittute either the inlet channel or the outlet channel for the pump, and the presence of the two external openings in each channel will enable the simultaneous attachment thereto of two inlet connections, or two outlet connections, if desired, the channels being suitably threaded at the openings for this purpose. If only one inlet opening or outlet opening is utilized, the'other remaining opening can be capped or plugged.

in a seating member 8| resting upon the upper edge of that chamber 63 on the pressure side of the pump and retained in place by'the bolted cap 1| which spans the valve seat member ll and clamps it to the pump casing. This valve seat member has integrally formed therewith,

valve guide means in the form of upstanding posts 83 disposed about the valve seat opening,

and a depending cylindrically shaped dash pot 85, the wall of which adjacent the valve seat being provided with openings 81 therein, enabling the admission of liquid thereto from the.

pressure side of the pump. The valve head 15 has depending therefrom an integral shank 99 extending into the dash pot 85 and terminating in a circular flang 9| having a peripheral groove 93, the flange making a rather snug fit with the inner wall of the dash pct 85 below the openings 91 therein to enable said flange .to act as a piston 95. The piston has a perforation 91 or a plurality of such perforations therethrough, intermediate the shank 89 and the piston surface and such openings are covered by a distortable disc 99, spring biased against the under surface of the piston 95 by a conical coil spring IUI, which itself is maintained in position by a machine screw I03 extending through the center of the spring IOI and threaded into the shank 89. The compression of the conical coiled spring may be varied by adjusting the machine screw, thereby altering the pressure of the disc 99 against the under surface of the piston 95. The dash pot 85 is rounded out at its lower end to provide a chamber I05 in the dash pot below the piston.

The valve 13 when closed, is maintained in its seated position by a valve spring I01 which bears The casing. of the pump. is further provided with a pair of duplicate chambers 53 together extending across and to the front of thespherical pump chamber and separated by a partition wall 55, each chamber communicating at one end with that channel 51 adjacent thereto. These chambers 63 are furthermore formed with a central valve receiving opening 59 in the ceiling thereof and a hollow ganged cap 1I supported upon the upper rim surface of the chambers and bolted thereto, serves to provide in combination with the chambers 53 a passageway interconnecting the inlet and outlet channels 51 of the pump.

This interconnecting passageway during operation of the pump is normally closed or open to a desired. degree depending upon adjustments to be described, by a chatter proof relief valve 13 which is located in the interconnecting passage where it may be exposed to the pump pressure developed in that chamber connecting with the outlet channel of the pump. This valve comprises a circular valve head 19 having a frusto conical surface 11 adapted to 'seat upon a wave seat 19 formed by a circular opening head 15 and at its other end, against a washer engagingthe under surface of the lip I99 of a flanged cup III'. A valve spring adjusting screw I I3, threaded into an opening II5 through the cap 1I directly above the flanged cup III, is

adapted to enter and engage the flanged cup and maintain the valve spring I91 under compression. The degree of compression of the valve spring may thus be controlled by manipulation of the adjusting screw H3. The opening H5 is normally maintained closed by a protecting cap nut 'I I1 threaded therein.

As previouslyindicated the relief valve 13 cccupies that chamber 63 on the pressure side of the pump. In view of the fact that such chamber has communication with the outlet channel, the liquid under pressure in the pump will have access to the dash pct and exert a pressure -upon the disc 99 through the perforation 91 in to be suddenly released into the chamber I05 below the piston thus equalizing the pressure on both sides of the piston and enabling the valve tofly open against the action of the valve spring I91. The result of this action of the valve, is to open the interconnecting passageway to the flow of liquid from the outlet channel back to the inlet channel ,and bring about a relief of the pressure on the pressure side of the pump. When the pressure in the outlet channel of the pump has been reduced, the valve will start to closeunder the restoring action of the valve spring I91, but

its closing action unlike the opening of the valve,

cannot be sudden since the liquid in the dash pot is trapped in the chamber I beneath the piston and must be displaced therefrom. Since such liquid cannot escape through the perforations 91 in the piston, its only manner ofexit is between the piston 95 and the contacted surface of the dash pot. The escape can therefore be only. gradual, thus retarding the return movement of the valve to its normal position. The valve therefore cannot chatter in operation.

In order to control the normal operating condition ofthe valve so that the valvemay occupy any adjustment position from .a fully closed to a fully open position, I provide a flanged cup 9 about the lower or valve head contacting end of I, the valve spring I01 and engage the flange or lip of the cup by means of a yoke I2I at one end of a lever I23 which is anchored at its other end to an internal shoulder I25 formed adjacent the farther end of the cap 1|. A manually operable adjustment as described by me above. The load imposed upon the engine by the pumpin the act of starting of the engine, may be efiicaciously re- -moved by utilizing the hand control to lift the spring engaging flanged cup II9 to its maximum height above the valve seat. Consequently as a result, the interconnecting passage will in effect be wide open, thus precluding development of any ing it with the other chamber 63 which was prviously on the inlet side of the pump but during control rod or shaft. I21 extends through the cap.

transversely of the yoked lever I23, and has af-- fixed thereto within the cap, a cam I29 adapted upon turning of the shaft to ride against the under surface. of the lever I23 and raise and lower the same in accordance with the angular position of the cam.- The cam is shaped to provide a my invention, as previously set forth.

While I have described my invention in detailreverse operation, will be onthe outlet or pressure side. a

It will be apparent from the above description of my invention, that I have provided a simple construction capable of fulfilling the objects of and in combination with a specific type of pump with which it is well fitted for operation, it will ing positions of the cam, due to the curvature thereof and the friction between the cam and the lever, the cam is capable of holding the lever at any of such positions. A handle I33 affixed to one end of the shaft I2I permits ofthe manual control of the cam adjustment of the lever position referred to.

Lifting of the flanged cup I I9 a predetermined distance away from the closed position of the valve head, against the action of the valve spring IIII,-removes the spring pressure therefrom, al-

lowing the valve to be floated off its valveseat during operation of the pump, and maintain contact against the bottom of the cup H9 bythe nevertheless be apparent that the invention is applicable in a measure to pumps of various types, and I consequently do not desire to be limited in my protection to the specific types disclosed and described ,by me except as may be necessitated by the prior art and theappended claims.

I claim: l

1. In combination with means forming a pass sageway ,-a valve seat .forminga part of the walls of said passageway, a dash pot having a closed bottom depending from said valve seat and having openings into said passageway adjacent said ing into said dash-pot and terminating in a dash pressure of the liquid beneath the valve head.

The extent to which the valve will rise will de-' pend of course upon the cam controlled lever adjustment. Thus, it will be apparent that the valve may be. adjusted to assume amore or less open position during normal operation of the pump and by so adjusting the valve, the pressure developed by the pump 'may be regulated and determined in advance. The effect of the valve adjustments, as described, alters the flow capacity of the interconnecting passageway and enables the'pump to by-pass a certain portion of the liquid handled by the pump, and in controlling the pressure of the pump in this manner, the .volume of liquid pumped through the outlet channel is also controlled.

Pumps of the above type are employed quite extensively on trucks for the pumping of petroleum products such as butane, gasoline, and other liquid products of greater or less viscosity, and when employed on trucks, the pumps are usually driven from the truck engine. In starting such engines, it is preferable to remove all load therefrom, and while the pump might be disconnected therefrom by means of a clutch interposed in the drive connection to the pump, such auxiliary apparatus is not required when the pump has in- I corporated therein the relief valve and manual pot piston loosely fitting the dash pot wall-s, said piston being perforated to enable fluid to reach the underside thereof, a distortable disc resiliently held against said underside to normall close the perforations in said piston, a spring seat mounted for axial movement on the side of said valve head opposite the shank side thereof, a valve spring bearing on said spring seat and a wall of said passageway urging said valve head against said valve seat with said piston normally below the openings in said dash pot, and control means for axially moving said spring seat toward and from said valve head. 7

2. Apparatus in accordance with claim 1, wherein said spring control means passes through the passageway wall for external operation thereof.

3. Apparatus in accordance with claim 1. wherein said passageway is divided along a plane providing coplanar identical ports and wherein said valve seat is mounted in an arched casing connecting said ports, said casing seating on said passageway walls around both ofsaid ports with said valve seat mounted in one of said ports with said dash pot extending into said passageway, and means for fastening said casing to said passageway walls with said valve seat mounted in either port as desired. a

v ALBERT J. GRANBERG.

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