US1357671A - aikmast - Google Patents

Description

B. S. AIKMAN.

PUMP.

APPLICATION FILED OCT. 5. 1911.

Patented Nov. 2, 1920.

' 2 SHIEETS HEET l.

B. S. AIKMAN.

PUMP.

APPLICATION nuzn 001.5, 1911.

1 ,357,671 Patented Nov. 2, 1920.

2 SHEETS SI-IEET 2.

\ vnnnuu nnu; 5:5,... "nun".

UNITED STATE SPAlENT OFFICE.

BURT-(3N l3. AIRMAN, .OF MILWAUKEE, fi/VISGONSIN, ASSIGNOE T8 NATIONAL BRAKE 86 ELECTRIC COMPANY, OF MILVAUK'EE, VTISCO 'NSIN, A CORPGRATIGN OF WISCONSIN.

PUMP.

Specification of Letters Patent. 7 Patented N 2, 19,;{1

Application filed October '5, 1917. serial no. lessee.

an isolated plant for furnishing water to a residence or an. industrial establishment from a nearby source, such as a well.

it is the purpose of my invention to provide an improved pump for use in a system w iicli supplies water fresh from the well, that is, without the intervention of a stora e or reserve tank and which will be under i'aucet control by which I mean that the low of water is controlled by opening and closing the faucets which form the supply outlet of the system.

The pump operates so long as it is supplied, with compressed air and has a tree outlet for the water. If the outlet is completely shut oil', as when all the faucets are closed, the pump ceases to operate. As soon as an outlet is provided, as by opening a faucet, the pump again operates. As the running of the pump is dependent upon the provision of an outlet as by opening the faucets, this type of system is designated a faucet mmtrol system.

'1'. he object of the present invention is to provide a pump of this class which is ellicicnt, simple, rugged and inexpensive to manufacture or to operate. Many of the pumps of this general type new found on the market are ine'ilicient in the use oi compressed air, or motive fluid. This is ,genorally the fault of poor design and construction and particularly it is due to the. fact that '11 many of the prior art devices a separate air motor ied independently with compressed air is employed to operate the ralves.

I employ the air which works the valves in the hmly of the pump to perform work, thus a maximum etllciency of the air is secured.

Another disadvantageous feature of the prior art devices is the fact that they use the air noirexpansively. This is because the valves are purely level controlled.

air is used expansively, that is, the air is permitted to work so long as it has suiiicient pressure to do so before it is exhausted. This is secured by providing pressure control in addition to the usual level control. A further advantage of the present invention is the ability to dispense with a maintaining valve and employ a simple reduction valve. f

A further advantage is the ability to make up the device in small size of few parts and oil rugged construction. It is impossible for the valve mechanism to become so set that air can blow through the device without doing work. Numerous other advantages will be apparent from the following specilication.

One embodiment of my invention is illustrated in the accompanying drawings, in which-- Figure 1 is a more or less diagrammatic view illustrating the system as a whole;

Fig. 2 is a vertical axial sectional view of y the pump; and V and looking in the direction indicated bythef arrow.

As shown diagrammatically in Fig. 1, the pump is disposed in the well, the curbing oi which is shown at 5, below the level 6 of the water so that the pump automatically fills at the proper time, as will be described later. The pump structurehas leac ing therefrom three pipes, an air pressure pipe 7, an exhaust pipe 8, and a water discharge pipe 9. The water discharge pipe 9 is connected with the air spring 10 and with various branch pipes 11, 11, each of which is provided with a faucet 12. The air pressure pipe 7 isconnected through the reducing valve 13, and the pipe 1i and 15, with a compressed air tank 16, in which air is stored under pressure as by means 01 a suitable compressor 17 driven by the motor 18. It will be apparent to those skilled in the art that the compressor may be operated by any other motor such as a engine, steam engine, or the like, and if desired, means may be provided for automatically starting and stopping the motor when the pressure in the tank drops to a prescribed minimum ssj prescribed maximum, respec- 'convenient manner.

The pump 4 is shown in detail in Figs. 2 and 3. The pump comprises a cylindrical barrel 22, preferably in the form of a piece of seamless brass tubing. The upper end of the barrel is closed off by a head casting 23 and the lower end of the barrel is closed off by the foot casting 24. The head casting 23 and the foot casting 24 are held together upon the ends of the barrel 22 by means of the tie pipes 25 and 26 which serve also as discharge pipes. At their upper ends these pipes are screwed into suitable openings provided in the head casting 23 and at their lower ends these pipes are screwed into suitable openings in the upper )art of the valve cage 27. The valve cage 21 is connected to the foot member 24 by means of the central bolt 28. The valve cage 27 incloses the check valve 29 which controls aport 3O communicating with the lower part of the pump cylinder 22 by way of the passageways 31. The foot member 24 is provided with inlet ports 32 which are controlled by the check valve 33. A conical screen 34 covers the bottom of the foot member 24 and prevents the entry of foreign matter to the pump cylinder. Suitable packing. as shown at and 36, serves to make a tight oint between the ends of the barrel and the head and foot castings, respectively.

The air inlet pipe 7, air exhaust pipe 8, and water discharge pipe 9 are threaded, respectively, into the air inlet 37, exhaust air outlet 38 and water discharge out-let 39 of the head casting 23 of the pump. The water outlet 39 is in communication with the pipes 25 and 26 by means of the passageway 40.

The air inlet 37 communicates with the interior of the pump cylinder 22 by means of the passageways 41 and 42, diaphragm chamber or cylinder 43, and passageways 44, 45, 46 and 47. The passageway 41-42 is of smaller size than the passageway 44454647 so that there is normally a reduction of pressure due to the restricted flow, in the cylinder 43. The passageway 47 is formed through a removable nipple which forms a valve seat. This valve port 47 is controlled by a valve member 48, mounted on the arm 49 of a bell-crank lever 50. The bell-crank lever 50 rocks upon a bolt 51, bearing in the arms 52 which project from the head casting 23. The arm 53 of the bell-crank lever has pivotally connected thereto a water weight 54 by means of the link 55. The opposite arm 56 of the bell-crank lever 50 is provided with projecting pins 57, 57 which are connected at their ends to the springs 58, 58, these springs being connected at their upper ones to the head casting 23. The water weight 54 comprises a hollow cylindrical body consisting of a shell of metal 59, preferably a tube oi brass or bronze, or the like, and having its lower end closed. by a head 60, this head be ing provided with a guiding pin 61., which is guided in a suitable bracket 62 projecting from the valve cage 27. The head 60 has projecting therefrom an arm 63 to which is secured a spring 64, this spring being connected at its upper end to the bracket 65, which is clamped about the pipes 25 and 26. The spring 64 serves to counterbalance a part of the weight of the float or water weight 54. I have found that a float may be employed where for certain reasons it is desirable. In that case the springs 58 are eliminated.

Referring now to the mechanism for con trolling the exhaust, it will be seen that a portion of the diaphragm chamber or cylinder 43 is formed in the head casting 23 and the other portion is formed by provid ing a suitable recessed member 67, which is secured to the head casting by means of suitable screws, the diaphragm 68 being clamped and held in place between the member 67 and the head casting. The h ad casting 23 has provided, in a suitable pocket, a sleeve member 69, through which a stem 70 slides freely. The stem 70 is reduced in diameter at each end, one end being threaded and clamped to the diaphragm 68 by means of the lock nut 71 and the other end b3 firmly secured to the valve 72 controllin port 7 8 communicating with the on. Just outlet 38. The valve 72 seats with the pressure in the pumping chamber and hence always tends to remain tight while under pressure. A spring 74 is placed between the head casting and the diaphragm ($8 to hold normally the valve 72 tight against its s thus closing off the exhaust port T e valve 72 closes off the port by means or a double seat so that no packing for the sleeve 69 is necessary.

lVhen the pump is submerged in the v e-' and the exhaust valve is open the water pass through the openings in the screen 34 up through the port 3 past the check valve 33, and substantially fill the cylinder 22. As the level of the water in the pump tends to rise, the water weight 54 also tends to rise due to the springs (34 and the support aitorded by the water until the up 'ard thrust is suilicient to overcome the pull of the springs 5858. The bell-cranlz lever 50 then turns quickly about its pivot and causes the passageway 47 to be uncovered with a sharp snap. When the water is driven out of the barrel obviously the water weight will move to its lowest position, thereby causing the bell-crank lever 50 to turn about its pivot 51, in a clockwise di rection in Fig. 3, thus causing the valve 4:8 to close o'tf the passageway 47. The springs 58, 58 cause the valve 48 to open and close positively and quickly with a snap action. The maximum resistance offered by these springs occurs in their outermost position. Hence as soon as the water weight 54: evercomes the initial tension in either direction the valve opens and closes at once I find it desirable in the operation of the pump to keep the port 4:? closed by the valve 48 until the pump is substantially full of water and to accomplish this result I provide the flow controlled brake 75. This brake consists of a bell-crank lever pivotally secured to the upper part of the valve cage 27, one arm of which bears against the guiding rod 61 secured to the water weight 5d and the other arm of which is attached to a circular plate 76. The plate 76 is disposed horizontally in the pump cylinder and covers considerable area. When the water in the pump rises the plate is pushed upwardly by the incoming current of Water, causing one arm of the bell-crank lever 7 5 to press against the rod 61 and hold the water weight down. lVhen the pump is substantially full of water the flow into the pump abates and the brake is released, which permits the water weight to rise and open the valve 48.

A passageway 7 7 is provided from the interior of the pump to the chamber on the righthand side of the diaphragm 68 so that when air is admitted to the interior of the pump the pressures on both sides of the diaphragm 68 tend to equalize. The passageway 4:1 is restricted in area, while the passageways a l, 45, d6 and 4L7 are of considerably larger area. This permits the air to pass freely out of the diaphragm chamber 43 to the interior of the pump and around to the right hand side of the diaphragm 68, thus preventing the exhaust valve 69 from opening until the proper time, as no pressure builds up in the chamber on the front side of the diaphragm.

Assuming the pum to be connected to a system as shown in ig. 1 with the parts in the position shown in Figs. 2 and 8, the operation of the pump and the system is as follows:

When a faucet is opened, water will flow out of the air spring 10, thus lowering the pressure of the water therein and permitting the pump to operate. The air passes through therestricted passageways l-l and 42 into the diaphragm chamber 43 and through the passageways A, 45, 46 and 47 to the interior of the pump cylinder. The

pump being full'of water, the water is forced down in the pump cylinder through the passageways 31, 31, port 30, past the check valve 29, up through the pipes 25 and 26, through the passageway 40, pipe 9, andto the air spring 10 and consumption mains 11, 1.1, from which it may be drawn through a faucet for use. As the water passes out of the pump cylinder, the water Weight 54 tends to drop. lVhen the downward pull becomes great enough to overcome the springs 58, 58 the water weight causes the valve 48 to close, thus cutting off the supply of air to theinterior of the pump. The pressure then builds up on the left hand side, i. 6., the front of the diaphragm 68 until it is sufiiciently higher thanthe pressure of the air in the body of the pum r which latter pressure is exerted on the back of the diaphragm 6.8 to overcome the tension of the spring 74:, thus forcing the valve 72 away from its seat against the pressure of the'motive fluid tending to hold it to its seat and permitting the air to exhaust. lVhen the pump cylinder has been exhausted the water will again rise in the pump until it is substantially full of water. Then the water weight 54 willbe released and rises opening the valve 4:8 and air again is admitted to the pump. It will be seen that water may pass either to the consumption mains 11, 11 or into the'air spring 10. The

air cushion in the chamber 10 fills in the gap between the strokes of the pump sothat the flow'of water at the faucets l2 12. is substantially constant and no cessation of pressure is noticeable. lVhen all ofthe 'body of the pump before the exhaust valve 72 can be opened as the exhaust valve 72 is held to seat by the pressure of the motive fluid within the pumping chamber; This pressure can build up only after the air admission valve l8 is closed. p

The efiiciency of the pump is marked because of the fact that expansion of the air is permitted after the control valve 48 is closed. This is secured by requiring a difference of pressure on the two sides of the diaphragm 68 before the exhaust valve can be openeds No maintaining valve is necessary because of the difference in pressure required on opposite sides of the diaphragm 68. The reducing valve keeps excessive pressure from forming when the faucets are closed" and the restricted orifice all prevents overworking of the pump when the faucets are all opened wide.

If one of the faucets is just open enough to permit of a dripping at the same the valve action cannot become centered and cause a blowover because of the requirement to build up pressure in the front chamber 43 after the valve 48 is closed and a drop in pressure outside before the exhaust valve can open.

I claim:

1. In combination, a main pump barrel having water inlet and outlet valves, an exhaust valve, a diaphragm connected to the exhaust valve, one side of the diaphragm being subject to the pressure in the interior of the barrel, a chamber on the other side of the diaphragm having a restricted compressed air inlet port and a relatively free outlet port from the chamber into the pump barrel, and a valve governed by the level of the Water for controlling the outlet port.

2. In combination, a main pump barrel having Water inlet and outlet valves, an exhaust valve, a diaphragm connected to the exhaust valve, a chamber on one side communicating with the interior of the barrel, a chamber on the other side having a restricted compressed air inlet port and a relatively free outlet port from the chamber into the pump barrel, a valve, and a level controlled device for governing the valve.

3. In combination, a pump barrel, an exhaust valve, a movable pressure controlled member connected to said valve, a chamber communicating with the interior of the barrel on one side of the member, a chamber communicating with a source of motive fluid on the other side of the member and a level controlled *alve governing said member.

4. In combination, a pump barrel, an exhaust valve for the barrel, a pressure controlled device subject to the pressure within the barrel and a level controlled device subject to the level of the liquid in the barrel, said exhaust valve being jointly controlled by said devices.

5. In combination, a pump barrel, an exhaust valve, a pressure element subject to the pressure in the barrel for controlling the exhaust valve, and an inlet valve governing said pressure element.

6. In combination, a pump barrel, an exhaust valve, a pressure element subject to the pressure in the barrel for controlling the exhaust valve, an inlet valve governing said pressure element, and a level controlled device governing said inlet valve.

7. In combination, a pump barrel, an exhaust valve, and a pressure element subject to the difference in pressure between the incoming motive fluid and the pressure within the barrel for operating said exhaust valve.

8. In. combination, a pump barrel, an exhaust valve, a pressure element subject to the difference in pressure between the incoming motive fluid and the pressure within the barrel for operating said exhaust valve, and an inlet valve controlling the application of the pressure of the motive fluid to said element.

9. In combination, a pump barrel, an exhaust valve, a pressure element subject to the difference in pressure between the incoming motive fluid. and the pressure within the barrel for operating said exhaust valve, an inlet valve controlling the application of the pressure of the motive fluid to said element, and a level controlled device governing said valve.

lO. In combination, a closed pump cylind admii,,.ion and exhaust ports for said cylinder, water inlets and discharge passagew ys for said cylinder, valves controlling said admission and exhaust ports, means con trolled by the level oi? the water in said c v1 ii er for operating the valve to said admission port, and means controlling the valve to exhaust port operative only when the valve to saic admission port is closed.

11. In combination, a closed pump cylinder, adniiission and exhaust ports for said cylinder, water inlets and discharge passage ways for said cylinder, valves controlling said admission and exhaust ports, water lit within said cylinder for operating the valve to said admission port, and means controlling the valve to said exhaust port, eperative only when the valve to said admission port is closed.

In combination, a closed pump cylinadmission and exhaust ports tor said ider, water inlet and discharge passages for said cylinder, valves controlling aemission and exhaust ports, a level said controlled device within said cylinder for operating the *alve to said admission port, means controlling the valve to said exhaust port, and means to hold the valve controlling said adinisi. :1 port closed until the cylii'ider is substantially full oi water.

In combination, a closed pump cylinder, admission and exhaust ports for said cylinder, water inlet and discharge passageways for said cylinder, valves controlling said admission and exhaust ports, a level controlled device within said cylinder for 01 ating the valve to said admission port, nicans controlling the valve to said exhaust port, and a brake associated with said level controlled device to hold the same down until the pump is substantially full of water.

let. In combination, a closed pinup cylinder, admission and exhaust ports for said cylinder, water inlet and discharge passageways for said cylinder, valves controlling said admission and exhaust ports, means controlling the valve to said exhaust port, means controlling the valve to said admis sion port, a level controlled device in said cylinder, and means controlled by said level controlled device for imparting a snap action to said admission valve controlling means.

15. l n a pump, a cylinder, a cylinder head member having a chamber for a diaphragm, an air admission port communicating with said diaphragm chamber, a passageway leading from said chamber to the interior of said cylinder, a valve controlling said passageway, an exhaust port commimicating with the interior of said cylinder, a valve controlling said exhaust port and operated by said diaphragm, and means controlled by the level oi the water in the cylinder for operating the valve controlling said admission passageway.

16. In a pump, a cylinder, a cylinder head member having a chamber for a diaphragm, an admission port, a restricted passageway leading from said port to said dipahragm chamber, a relatively free passageway lead ing from said chamber to the interior ofsaid pump cylinder, a valve controlling said rela tively tree passageway, an exhaust port com-- municating with the interior of said cylinder, a valve controlling said exhaust port and operated by said diaphragm, and means controlled by the level of the water in the cylinder for operating the valve controlling said relatively free passageway.

17. in a pump, a cylinder, a cylinder head member having a chamber for a diaphragm, an air admission port communicating with one side of said diaphragm chamber, a passageway leading from said chamber to the interior of said cylinder, a valve controlling said passageway, a passageway leading from the interior of said cylinder to the other side of said diaphragm chamber, an exhaust port communicating with the interior of said cylinder, a valve controlling said exhaust port and operated by said diaphragm, and means controlled by the level of thewater in the cylinder for operating said admission passageway.

18. In a pump, a pumping cylinder having inlet; and discharge valves for liquid, admission and exhaust valves for motive fluid, a motor for operating one of the valves for motive fluid, a level controlled device governing said motor, and means for dis-' charging the exhaust of the motor into the cylinder during the admission period of the cylinder.

- 19. in a pump, a cylinder having inlet and discharge valves for liquid, admission and exhaust valves for motive fluid, a motor for operating the exhaust valve, a level controlled device governing said motor and means :lor discharging the exhaust of the the valve controllingmotor into the pump cylinder and opening the admission valve of thecylinder, said means being responsive to high level conditions in the cylinder.

20. In combination, a pump cylinder having inlet and discharge valves for liquid, admissionand exhaust valves for motive fluid, a motor for operating the exhaust valve and level controlled means responsive to low level conditions in the cylinder governing the effective application of pressure to the motor to open the exhaust valve, said motor having a connection with the pump cylinder-for discharging the exhaust from the motor cylinder into the pump cylinder.

21. In a pump, a cylinder having inlet and discharge, valves for liquid, admission and exhaust valves for motive fluid, said exhaust valve having ayielding face and being adapted to be held to its seat by the pressure of motive fluid within the cylinder, a motor having a flexible diaphragm for operating the exhaust valve in one direction, spring means for making the return stroke of the motor, and level controlled means responsive to low level conditions in the cylinder governing the application of pressure to the motor to open the exhaust valve.

22. In a pump, a pumping cylinder, inlet and discharge means for liquid, admission and exhaust passageways for motive fluid, an exhaust valve, a pressure operated motor, said motor comprising a pressure chamber and a movable piston, and level controlled means governing the accumulation of pressure in said pressure chamber, said motor controlling the operation of said exhaust valve, said motor discharging its exhaust into the pumping cylinder.

23. In a pump, a pumping cylinder, inlet and discharge means for liquid, admission and exhaust passageways for motive fluid, an exhaust valve, a pressure operated motor adapted to communicate with the admission passageway, said motor comprising a pressure chamber and a movabl'e' 'piston and means controlled by the low level of liquid in the pumping cylinder for controlling the application of pressure to the. piston, said motor controlling the operation of the exhaust valve, the exhaust of said motor being discharged into the pumping cylinder when the cylinder is filled with water.

24L. In combination a pump barrel, comprising a cylinder, an admission passage way, an admission port, an exhaust port, a valve for the exhaust port, means tendingto close the exhaust port, a valve for the admission port, a level controlled device governing said admission valve, and a motor having a motor chamber connecting with the admission passageway and the admission port, said motor controlling said exhaust port.

25; In combination, a pumping chamber,

inlet and discharge valves for liquid, an admission passageway for motive fluid, an admission port for achnitting motive fluid to the pumping chamber from the passageway, a motor cylinder communicating With the admission passageway, a piston for the cylinder, an exhaust valve controlled by the piston, and a float responsive to the low level of liquid for controlling the effective appli cation of pressure to the piston, said motor cylinder having a restricted opening for the admission of motive fluid.

26. In combination, a source of motive fluid, a pump barrel subject to high level and to loW level conditions therein, an ex haust port, an exhaust valve therefor, an inlet port, an inlet valve therefor, a float controlled by one level condition for operating one of said valves for each pump stroke, and a pressure motor having a cylinder communicating with the source of motive fluid through a restricted connection and having a piston operated by the pressure of the motive fluid Within the cylinder upon the other extreme level condition for controlling the other of said valves for each pump stroke.

27. In combination, a source of motive fluid, a pump cylinder having air inlet and exhaust valves, a motor having a diaphragm, said motor having a restricted communication with the source of motive fluid, one of said valves being operated by said diaphragm for each stroke of the motor, a spring for the diaphragm for holding the diaphragm in one extreme position, a float controlling the other valve, said float and other valve controlling the application of pressure to said diaphragm to overcome the pressure of the spring to shift the first valve for each stroke of the pump.

28. In combination, a pump cylinder having Water inlet and discharge ports, admis sion and exhaust ports, admission and exhaust valves therefor, level controlled means for controlling said valves for each stroke of the pump, and flow controlled means subject to the flow of Water into the cylinder for controlling the movement of said level controlled means.

29. In combination, a pump cylinder having a Water inlet port, a Water discharge port, an exhaust air port and an air inlet port, a passageway leading from the air inlet to the interior of the pump, said passageWay comprising a pressure cylinder, an inlet valve controlling said passageway, a float valve controlled by high level for causing the pressure to build up in said pressure cylinder, a piston for the pressure cylinder, and a valve controlled by the movement of said piston, said valve controlling one of said air ports.

30. In a pump, a cylinder having inlet and discharge passages for liquid, admission and exhaust passages for motive fluid, a

motor for ope 'ating the exhaust valve, and a loW level controlled valve governing said motor, said motor being adapted to dis charge the exhaust therefrom back into the cylinder.

31. In combination, a pump cylinder, a motor cylinder, a motor piston for said lat ter cylinder, an exhaust valve controlled by said piston, a spring for holding the piston at one end of its stroke and for holding the exhaust valve closed, and a float controlled valve controlled by the low level in the cylinder and a motive fluid port controlled by the float valve for controlling the pressure Within the cylinder to open the exhaust valve.

32. In combination, a cylinder, a head member for closing the top of the cylinder, a foot member for closing the bottom of the cylinder, a valve box in the cylinder, said box having a valved port for permitting the Water to be driven from the pump cyl inder into the box, a Water discharge passageway in the head member, a pipe connecting the passageway in the head member With the box, and a threaded pin connecting the valve box and foot member, said pipe, box and pin serving as a mechanical con nection between the head member and the foot member.

33. In combination, a cylinder, a head for the cylinder, a foot member for the cylinder, connecting means for the head and foot member, said connecting means lying Within the cylinder, said foot member comprising a central boss having an annular opening, comprising a- Water inlet port, an annular valve for said port and a central guide for said valve, said central guide bcing connected to said foot member.

34;. In combination, a cylinder, a head member, a foot member, said foot member comprising a central boss, means comprising a rod for connecting the head member and the foot member, said rod passing through said central boss, said foot member having an annular inlet port about said central boss, and an annular valve for controlling said port.

35. In combination, a pump chamber com prising a cylinder having a head member and a foot member, said head member having a valve and motor member mounted thereon and disposed Within the cylinder, said member having air inlet and exhaust valves, and a valve operating motor having a diaphragm, one of said valves being operated by said diaphragm for each stroke of the pump, a spring for the diaphragm for holding the diaphragm in one extreme position, the other valve being level controlled, said other valve controlling the ap plication of pressure to said diaphragm to overcome the pressure of the spring to shift the first valve for each stroke of the pump.

36. in combination, a pumping chamber comprising a cylinder, a head member and a foot member, a valve and motor structure mounted on the lower side of the head and disposed within the cylinder, a head structure compriz-sing an inlet and an exhaust valve and a motor for operating one of said valves and a float for operating the other of said lves, said other valve governing the application of pressure to said motor for operating said one valve.

37. in combination, a pumping chamber, a main exhaust valve, a pressure motor, a restricted passageway providing constant comn'u'inication between the source of motive lluid and the pressure motor, an exhaust port for the pressure motor opening into the pumi'iing chamber, said exhaust port being of larg r capacity than the restricted passageway, and a level controlled valve governing said exhaust port.

38. in combination, a pumping chamber, a main exhaust valve, a pressure motor, a restricted passageway providing constant comnimiication between the source of motive fluid and the pressure motor, an exhaust port for the pressure motor opening into the pum iiing chamber, said exhaust port being of larger capacity than the restricted passageway, means to seat the main exhaust valve with the pressure of the motive fluid in the pumping chamber, and a level controlled valve governing said exhaust port.

39. ln. combination, a pump cylinder haviug air inlet and exhaust valves, motor having a diaphragm, one of: said valves being operated by said diaphragm for each stroke oi the motor, a spring for the diaphragm for holding the diaphragm in one extreme position, said diaphragm being exposed on the side of the spring at all time to the pressure prevailing within the cylinder, :2 'l'loat controlling the other valve, the float and other valve COIl't'lOlllil the application oi" pressure to said diaphragm to overcome the pressure 01 the spring, to shift the first valve for each stroke of the pump.

40. in combination, a source of motive fluid a pumping chamber, an exhaust port for the pumping chamber, an exhaust valve for said port, said exhaust valve being held. to by the pressure within the pumping chamber, a pressure motor having a movable member subjected on one side to the pressure o motive fluid with in the pump chainher and having a chamber on the other side prm'idcd with restricted but constai'itly open comnuinication to the source of motive fluid and a W controlled valve governing the exhaust of pressure "from said latter chamber.

1:1,. in a pump, a cvlinder havi member, .id uid check a head .alves tor the cylinder,

an air admission valve, an air exhaust valve, ports for said valves formed in said head, said exhaust valve having a yielding face adapted to be held against its seat by internal pressure, said admission valve being of relatively smaller size than the exhaust valve and being adapted to be held to seat against the pressure of the motive fluid, a pressure motor comprising ,a flexible diaphragm for moving the exhaust valve away from seat against the internal pressure of the cylinder when the water has been driven from the pump cylinder and level responsive means adapted at low level to cause said admission valve to close.

42. In a pump, a cylinder having a head me aber, liquid check valves for the cylinder, separate air admission and air exhaust valves for the cylinder, ports for said valves formed in said head, said exhaust valve having a yielding face adapted to be held against its seat by internal pressure, said admission. valve being of relatively smaller size than the exhaust valve, a pressure motor mounted on said. head and comprising a flexible diaphragm for moving the exhaust valve away from seat against the internal pressure of the cylinder when the water has been driven from the pump cylinder and level. responsive means controlling said motor at low level. to open the exhaust valve, said exhaust valve being adapted to be held open and said admission valve adapted to be held closed until water has substantially t-ii cd the pump chamber.

in a pump, a cylinder, liquid check valves for the cylinder, a pressure motor having; a chamber and a movable member adaped to be operated by motive fluid, a restricted passageway connecting said chamhe with a source of motive fluid, a main exhaust valve adapted to seat with internal pressure and adapted to be moved off seat against said internal pressure by the movable motor member, a control valve for exhaust of the motor and means responsive to level in the pumping chamber for oper ating said control valve.

44. In pump, a cylinder having liquid check valves, a pressure motor having a chamber and movable member adapted to be operated by motive fluid, a constantly open restricted passageway connecting said chamber with a source of motive fluid, a main exhaust valve adapted to seat with internal pressure and adapted to be moved oil seat against said internal pressure by the movable motor member, an exhaust valve for the motor and a level responsive device con-- trolling said motor exhaust valve.

In witness whereo't l hereunto subscribe my name this 1st dav of October A. D, 1917.

BURTON S. ,LIKMAN.

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