CN201050454Y - Differential pressure driven reciprocating type double-function supercharging pump - Google Patents

Abstract

A differential pressure driven reciprocating double-acting booster pump. It mainly solves the problem of rising total energy consumption caused by high local pressure in the existing water injection system. It is characterized in that: a. The pressure dividing mechanism (1) is composed of a pump body (4), an inner cylinder separation sleeve (5) and a combined double piston (6); b. The reversing mechanism (2) is composed of a reversing housing (14), reversing rod (15), left and right end caps (16, 17) and tee pipe (18); c, reversing control mechanism (3) consists of left and right reversing control housings (28, 34), left and right control rods (29,35), reversing pipe A, B, C, D, E, F (30,36,37,38,39,40) form. The booster pump makes full use of the energy wasted in the water injection system pipe network, improves the energy utilization efficiency of the water injection system, improves the economic benefits of water injection production, reduces the investment cost of the water distribution room, and saves the investment and operation of the power grid for external power distribution. energy consumption costs.

Description

Pressure difference driven reciprocating double-acting booster pump

Technical field:

The utility model relates to a hydraulic booster pump used in an oil field water injection system, in particular to a pressure difference driven reciprocating double-acting booster pump.

Background technique:

For my country's onshore oilfields that mainly rely on water flooding for oil production, water injection into the ground is the main measure to maintain underground production pressure. Oilfield water injection system is generally composed of water injection station, water distribution room, water injection well and water injection pipe network connecting the above three. Due to the complex geological conditions of the oilfield, the injection pressure of water injection wells varies greatly. In order to ensure the normal water injection work of all water injection wells, water injection The water pressure of the pipe network has to adopt the principle of "as high as it is not as low as possible", that is, the pressure of the water injection pipe network cannot be lower than the maximum injection pressure of the water injection well. In recent years, the development of booster water injection pumps in oilfields has been very rapid, and two categories, centrifugal and reciprocating, have been initially formed. At present, oilfield water injection systems often have injection wells with both low-pressure wells and high-pressure wells. Sometimes there are only a few high-pressure wells in the entire system, while the rest are low-pressure wells. Due to the relatively small number of high-pressure water injection wells, this The water injection method consumes a lot of energy and has low efficiency. In this case, the traditional solution is to make the incoming water pressure equal to the pressure of the high-pressure well; the second is to install a booster pump at the head of the high-pressure well. In the oil field, an ordinary plunger pump driven by a motor is basically installed in the pipeline to achieve boosting. the goal of. However, no matter what the situation is, it will inevitably cause a large amount of energy loss, and the problem of high local pressure in the water injection system will lead to an increase in total energy consumption.

Utility model content:

In order to solve the problem of rising total energy consumption caused by high local pressure in the existing water injection system, the utility model provides a pressure difference driven reciprocating double-acting booster pump, which is fully Utilizes the energy wasted in the water injection system pipe network, improves the energy utilization efficiency of the water injection system, improves the economic benefits of water injection production, reduces the investment cost of the water distribution room, and saves the power grid investment for external power distribution and energy consumption during operation. , The working water volume of the pump can be matched with the high and low pressure water volume.

The technical scheme of the utility model is: the pressure difference driven reciprocating double-acting booster pump includes a pressure dividing mechanism, a reversing mechanism, a reversing control mechanism, a high-pressure water injection pipe, a low-pressure water injection pipe and a water inlet pipe, and the characteristics are:

a. The pressure dividing mechanism is composed of a pump body, a partition sleeve in the cylinder and a combined double piston. The partition sleeve in the cylinder is fixed in the middle of the pump body and divides the pump body into left and right chambers. The left and right passages connected by the chambers are respectively equipped with left and right one-way valves. The piston rod of the combined double piston passes through the separation sleeve in the cylinder and the piston bodies at both ends are respectively placed in the pump body. In the left and right chambers, the left and right passages above the left and right one-way valves communicate with the right end of the right chamber and the left end of the left chamber respectively, and the right end of the left chamber of the pump body and the left end of the right chamber pass through the left and right high-pressure drainage pump valves respectively. It communicates with the high-pressure water injection pipe.

b. The reversing mechanism is composed of a reversing shell, a reversing rod, left and right end caps and a three-way pipe. The lower part of the reversing shell has left and right through holes that communicate with the left and right channels on the pump body respectively. The upper part of the reversing shell is opened with left and right low-pressure water outlet holes that are connected with the three-way pipe, and the three-way pipe is connected with the low-pressure water injection pipe. The middle part of the reversing shell is connected with the water inlet pipe. Inverted "king" shape, the reversing rod is placed in the reversing housing, the reversing rod can slide in the reversing housing and is sealed with the reversing housing, when the reversing rod is at the left end of the reversing housing, the water inlet pipe and the reversing housing The right through hole under the reversing housing communicates. When the reversing rod is at the right end of the reversing housing, the water inlet pipe communicates with the left through hole under the reversing housing. , Right end cap.

c. The reversing control mechanism is composed of left and right reversing control housings, left and right control rods, reversing tubes A, B, C, D, E, and F. The side walls of the left reversing control housing pass through the reversing Pipes A, B, and C are connected to the water inlet pipe, the left end cover of the reversing housing and the low-pressure water injection pipe, and the side wall of the right reversing control housing is respectively connected to the water inlet pipe and the right end of the reversing housing through reversing pipes D, E, and F. The cover and the low-pressure water injection pipe, the left and right control rods are respectively placed in the left and right reversing control housings, and the left and right reversing control housings are respectively fixed at the two ends of the pump body in the pressure dividing mechanism. The left and right control rods They are respectively connected to the two ends of the combined duplex piston and follow up with the combined duplex piston.

The inner walls of the left and right chambers of the pump body are equipped with cylinder liners.

An inspection hole is opened above the reversing housing and a plug is installed in the inspection hole.

The left and right passages above the left and right one-way valves communicate with the right end of the right chamber and the left end of the left chamber respectively through external communication pipes a and b.

The left and right reversing control housings are respectively connected with the two ends of the pump body by flanges.

The left and right control rods are respectively connected with the two ends of the combined duplex piston through "T" shaped tenons and grooves.

The reversing housings are stacked above the pump body and fixed by bolts. The left and right through holes correspond to the left and right channels respectively. The left and right channels are stepped. The left and right one-way valves are placed on the left and right. In the channel and is compressed by the compression sleeve.

The left and right one-way valves and the left and right high-pressure drainage pump valves have the same structure, and are all composed of a valve seat, a one-way valve core, a spring, a valve sleeve and a nut. The middle part of the valve seat has a water hole. The directional spool passes through the valve seat and the valve sleeve and is fixed by nuts, the one-way spool can move relatively along the center hole of the valve seat, and the spring is placed between the valve sleeve and the valve seat.

The utility model has the following beneficial effects: due to the adoption of the above scheme, the water in the water injection pipe network can be used as the power fluid, and the water injection operation to the high pressure water injection well can be realized by using the difference between the incoming water pressure in the water injection pipe network system and the injection pressure of the low pressure water injection well , this working process does not require additional power input from the outside. It can convert part of the incoming water in the water injection pipe network system into high-pressure water and the other part into low-pressure water, so as to realize water injection into low-pressure wells and high-pressure wells at the same time. The booster pump improves the energy utilization efficiency of the water injection system, improves the economic benefits of water injection production, reduces the investment cost of the water distribution room, saves the investment of the power grid for external power distribution and the energy consumption cost during operation. The work of the pump The water volume and the high and low pressure water volumes can be matched and adjusted.

Description of drawings:

Accompanying drawing 1 is the structural representation of the utility model;

Accompanying drawing 2 is a structural sectional view of the utility model;

Accompanying drawing 3 is A-A structure sectional view among Fig. 2;

Accompanying drawing 4 is B-B structure sectional view among Fig. 2;

Accompanying drawing 5 is the structural sectional view of left and right check valve (9,10) of Fig. 2 and left and right high-pressure drainage pump valve (11,12) in Fig. 4.

In the figure, 1-pressure dividing mechanism, 2-reversing mechanism, 3-reversing control mechanism, 4-pump body, 5-separator sleeve in cylinder, 6-combined double piston, 7-left channel, 8-right channel , 9-left one-way valve, 10-right one-way valve, 11-left high-pressure drainage pump valve, 12-right high-pressure drainage pump valve, 13-high-pressure water injection pipe, 14-reversing shell, 15-reversing rod, 16-left end cover, 17-right end cover, 18-tee pipe, 19-left through hole, 20-right through hole, 21-left low pressure water outlet, 22-right low pressure water outlet, 23-low pressure water injection pipe, 24- Water inlet pipe, 25-wire hole, 26-communicating pipe a, 27-communicating pipe b, 28-left reversing control housing, 29-left control rod, 30-reversing pipe A, 31-cylinder liner, 32-wire Blocking, 33-pressure gauge, 34-right reversing control housing, 35-right control rod, 36-reversing tube B, 37-reversing tube C, 38-reversing tube D, 39-reversing tube E, 40-reversing pipe F, 41-bolt, 42-compression sleeve, 43-valve seat, 44-one-way valve core, 45-spring, 46-valve sleeve, 47-nut, 48-water hole.

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Fig. 1 combined with Fig. 2, Fig. 3 and Fig. 4, the differential pressure driven reciprocating double-acting booster pump includes a pressure dividing mechanism 1, a reversing mechanism 2, a reversing control mechanism 3, a high-pressure water injection pipe 13, a low-pressure injection The water pipe 23 and the water inlet pipe 24 are characterized in that:

a. The pressure dividing mechanism 1 is composed of a pump body 4, a cylinder partition sleeve 5 and a combined double piston 6. The cylinder partition sleeve 5 is fixed in the middle of the pump body 4 and divides the pump body 4 into left and right chambers. The pump body The left and right chamber inner walls of 4 are equipped with cylinder liners 31 . The middle part of the pump body 4 is provided with left and right passages (7, 8) communicating with the left and right chambers respectively, and left and right one-way valves (9, 10) are respectively installed in the left and right passages (7, 8). The piston rod of the type double-linked piston 6 passes through the partition sleeve 5 in the cylinder and the piston bodies at both ends are respectively placed in the left and right chambers of the pump body 4, the left and right passages above the left and right check valves (9, 10) ( 7, 8) Communicate with the right end of the right chamber and the left end of the left chamber through external communicating pipes a, b (26, 27). The right end of the left chamber of the pump body 4 and the left end of the right chamber communicate with the high-pressure water injection pipe 13 through the left and right high-pressure drainage pump valves (11, 12) respectively, and the left and right high-pressure drainage pump valves (11, 12) have two functions: One is pressure control, which can only be opened after the liquid pressure reaches the set value, and the other is one-way control, so that the liquid cannot flow backward.

b. The reversing mechanism 2 is composed of a reversing housing 14, a reversing rod 15, left and right end covers (16, 17) and a tee pipe 18. The left and right through holes (19, 20) connected to the left and right passages (7, 8), and the upper part of the reversing housing 14 are provided with left and right low-pressure water outlet holes (21, 22) connected to the three-way pipe 18 , the tee pipe 18 communicates with the low-pressure water injection pipe 23, and the middle part of the reversing housing 14 communicates with the water inlet pipe 24. In the body 14, the reversing rod 15 can slide in the reversing housing 14 and is sealed with the reversing housing 14. The right through hole 20 communicates, and when the reversing rod 15 is at the right end of the reversing housing 14, the water inlet pipe 24 communicates with the left through hole 19 below the reversing housing 14, and the two ends of the reversing housing 14 are fixed with threaded holes 25 respectively. The left and right end caps (16, 17). The top of the reversing housing 14 has a viewing hole and a plug 32 is installed in the viewing hole.

c, reversing control mechanism 3 consists of left and right reversing control housings (28, 34), left and right control levers (29, 35), reversing tubes A, B, C, D, E, F (30, 36, 37, 38, 39, 40), the side wall of the left reversing control housing (28) is respectively connected to the water inlet pipe 24 and the reversing housing 14 through the reversing pipes A, B, C (30, 36, 37) The left end cover 16 and the low-pressure water injection pipe 23, and the side wall of the right reversing control housing 34 are respectively connected to the water inlet pipe 24 and the right end cover 17 of the reversing housing 14 through the reversing pipes D, E, F (38, 39, 40). And the low-pressure water injection pipe 23, the left and right control rods (29,35) are respectively placed in the left and right reversing control housings (28,34), and the left and right reversing control housings (28,34) are respectively fixed on The two ends of the pump body 4 in the pressure dividing mechanism 1, the left and right control rods (29, 35) are respectively connected to the two ends of the combined duplex piston 6 and follow up with the combined duplex piston 6, and the left and right control The connection of rod (29,35) and duplex piston 6 adopts the form of " T " type tenon and groove. The left and right reversing control casings (28, 34) are respectively connected with the two ends of the pump body 4 by flanges.

The reversing housing 14 is stacked above the pump body 4 and fixed by bolts 41. The left and right through holes (19, 20) correspond to the left and right passages (7, 8) respectively, and the left and right passages (7, 8) correspond to the left and right passages (7, 8). , 8) is stepped, and the left and right one-way valves (9,10) are placed in the left and right passages (7,8) and are compressed by the compression sleeve 42. This connection form has compact structure, high pressure resistance and good sealing performance.

As shown in Figure 5, the left and right check valves (9, 10) and the left and right high-pressure drainage pump valves (11, 12) have the same structure, and are all composed of valve seat 43, check valve core 44, spring 45, valve Cover 46 and nut 47, valve seat 43 has a water hole 48 in the middle, one-way valve core 44 passes through valve seat 43 and valve sleeve 46 is fixed by nut 47, one-way valve core 44 can move along the center of valve seat 43 The holes move relatively, and the spring 45 is placed between the valve sleeve 46 and the valve seat 43 . The installation form of left and right high-pressure drainage pump valves (11,12) is identical with the installation form of left and right check valves (9,10).

In actual use, the water inlet pipe 24 is communicated with the incoming water pipeline in the water injection pipe network system through the flange, and the high-pressure water injection pipe 13 and the low-pressure water injection pipe 23 are respectively communicated with the high-pressure wellhead and the low-pressure wellhead through flange connection pipelines. In order to prevent the reversing rod 15 from being in the "dead point" position, that is, the reversing rod 15 is in the position of blocking the water inlet pipe 24, so that the incoming water cannot enter the left and right chambers of the pump body 4, and the plug 32 can be opened before use. Move the reversing lever 15 to the left end of the reversing housing 14 . Pressure gauge 33 can be loaded onto water inlet pipe 24, high pressure water injection pipe 13 and low pressure water injection pipe 23, which is convenient to observe the pressure of water in each working pipeline.

During the starting position of the positive stroke, the two piston bodies on the combined double piston 6 are all at the left end positions of the left and right chambers of the pump body 4, and the reversing rod 15 in the reversing mechanism 2 is at the left end. The incoming water in the water injection pipe network system enters the reversing housing 14 through the water inlet pipe 24. At this time, the water inlet pipe 24 communicates with the right through hole 20 below the reversing housing 14, and the right through hole 20 communicates with the right through hole 20 on the pressure dividing mechanism 1. Corresponding to the right channel 8, the right channel 8 communicates with the left end of the left chamber of the pump body 4 through the external connecting pipe b27, and the incoming water enters the left end of the left chamber of the pump body 4 and the left end of the pump body 4 respectively from the reversing housing 14. The left end of the right chamber pushes the combined double piston 6 to move to the right, and the left channel 7 above the left check valve 9 communicates with the right end of the right chamber of the pump body 4 through the external communication pipe a26, and the right chamber of the pump body 4 The water at the right end of the chamber enters the low-pressure wellhead through the connecting pipe a26, the left channel 7, the reversing housing 14, the left low-pressure outlet hole 21, the tee pipe 18, and the low-pressure water injection pipe 23, and the water at the right end of the left chamber of the pump body 4 forms a high pressure. Water, when its pressure reaches the injection pressure of the high-pressure well, opens the left high-pressure drainage pump valve 11 communicated with the right end of the left chamber of the pump body 4 to enter the high-pressure water injection pipe 13, and then injects it into the high-pressure wellhead. When the combined duplex piston 6 moves to the right end limit position, that is, when the combined duplex piston 6 moves to the designed stroke position, the left control rod 29 that follows it also moves to the right to the reversing point, so that the left reversing The reversing tube A30 on the control housing 28 is connected with the reversing tube B36, and the incoming water enters the left end of the reversing housing 14 from the left end cover 16 on the reversing mechanism 2 through the reversing tube A30 and the reversing tube B36, and at the same time The right control rod 35 connects the reversing pipe E39 on the right reversing control housing 34 with the reversing pipe F40, and pushes the reversing rod 15 in the reversing housing 14 to move to the right by relying on the pressure difference between the incoming water and the low-pressure well , the water at the right end of the reversing housing 14 enters the low-pressure wellhead through the reversing pipe E39, the reversing pipe F40, and the low-pressure water injection pipe 23. Since the left and right end caps (16, 17) of the reversing housing 14 are directly connected to the incoming water pipeline and the low-pressure well pipeline, when the reversing lever 15 moves to the "dead point" position, the incoming water and the low-pressure well can still be relied on. The pressure difference continues to reversing, thereby overcoming the problem of "dead point" in the moving process of the reversing rod 15, and when the reversing rod 15 moves to the right end position, the reversing is completed.

After reversing, the two piston bodies on the combined double piston 6 are all at the right end positions of the left and right chambers of the pump body 4, and the reversing rod 15 in the reversing mechanism 2 is at the right end. The incoming water in the water injection pipe network system enters the reversing housing 14 through the water inlet pipe 24. At this time, the water inlet pipe 24 communicates with the left through hole 19 below the reversing housing 14, and the left through hole 19 communicates with the left through hole 19 on the pressure dividing mechanism 1. Corresponding to the left channel 7, the left channel 7 communicates with the right end of the right chamber of the pump body 4 through the external connecting pipe a26, and the incoming water enters the right end of the right chamber of the pump body 4 and the right end of the pump body 4 respectively from the reversing housing 14. The right end of the left chamber pushes the combined double piston 6 to move to the left, and the right channel 8 above the right check valve 10 communicates with the left end of the left chamber of the pump body 4 through the external connecting pipe b27, and the left chamber of the pump body 4 The water at the left end of the chamber enters the low-pressure wellhead through the connecting pipe b27, the right channel 8, the reversing housing 14, the right low-pressure outlet hole 22, the tee pipe 18, and the low-pressure water injection pipe 23, and the water at the left end of the right chamber of the pump body 4 forms a high pressure Water, when its pressure reaches the injection pressure of the high-pressure well, opens the right high-pressure drainage pump valve 12 communicated with the left end of the right chamber of the pump body 4 to enter the high-pressure water injection pipe 13, and then injects into the high-pressure wellhead. When the combined double piston 6 moves to the left end limit position, that is, when the combined double piston 6 moves to the designed stroke position, the right control rod 35 that follows it also moves to the left to the reversing point, so that the right reversing The reversing pipe D38 on the control housing 34 is connected with the reversing pipe E39, then the incoming water enters the right end of the reversing housing 14 from the right end cover 17 on the reversing mechanism 2 through the reversing pipe D38 and the reversing pipe E39, and at the same time The left control rod 29 connects the reversing pipe B36 on the left reversing control housing 28 with the reversing pipe C37, and pushes the reversing rod 15 in the reversing housing 14 to move leftwards by relying on the pressure difference between the incoming water and the low-pressure well , the water at the left end of the reversing housing 14 enters the low-pressure wellhead through the reversing pipe B36, the reversing pipe C37, and the low-pressure water injection pipe 23. Thereby realizing the reciprocating motion of the pump.

In summary, the utility model can use the water in the water injection pipe network as the power fluid, and use the difference between the incoming water pressure in the water injection pipe network system and the injection pressure of the low pressure water injection well to realize the water injection operation to the high pressure water injection well. It needs external power input to convert part of the incoming water in the water injection pipe network system into high-pressure water and the other part into low-pressure water, so as to achieve simultaneous water injection into low-pressure wells and high-pressure wells. The utility model improves the energy utilization efficiency of the water injection system, improves the economic benefits of water injection production, reduces the investment cost of the water distribution room in the oil field, saves the power grid investment and the energy consumption cost in the operation process of the external power distribution, and the work of the pump The water volume and the high and low pressure water volumes can be matched and adjusted.

Claims (8)

1. a differential pressure drive reciprocating double-action booster pump comprises branch press mechanism (1), changement (2), commutation controlling mechanism (3), high pressure water injection pipe (13), low pressure water injection pipe (23) and intake pipe (24), it is characterized in that:

A, divide press mechanism (1) by the pump housing (4), divide spacer (5) and combined type double crosslinking piston (6) to form in the cylinder, divide spacer (5) to be fixed on the centre of the pump housing (4) and the pump housing (4) is divided into left and right sides chamber in the cylinder, the middle part of the pump housing (4) has the left and right sides passage (7 that communicates with left and right sides chamber respectively, 8), left and right sides passage (7,8) be separately installed with left and right sides one-way valve (9 in, 10), the piston rod of combined type double crosslinking piston (6) passes and divides the piston body at spacer (5) and its two ends to place respectively in the left and right sides chamber of the pump housing (4) in the cylinder, left and right sides one-way valve (9,10) Shang Fang left and right sides passage (7,8) communicate with right chamber right-hand member and left chamber's left end respectively, left chamber's right-hand member of the pump housing (4) and right chamber left end communicate with high pressure water injection pipe (13) by left and right sides High Pressure Drain pump valve (11,12) respectively;

B, changement (2) is by commutation housing (14), reversing bar (15), a left side, right end cap (16,17) and three-way pipe (18) form, the bottom of commutation housing (14) have respectively with the pump housing (4) on a left side, right passage (7,8) left side that communicates, right through hole (19,20), the top of commutation housing (14) has a left side that all communicates with three-way pipe (18), right low pressure delivery hole (21,22), three-way pipe (18) communicates with low pressure water injection pipe (23) again, the middle part of commutation housing (14) communicates with intake pipe (24), reversing bar (15) cross section is " king " font of falling, reversing bar (15) places in the commutation housing (14), reversing bar (15) can slide in commutation housing (14) and seal with commutation housing (14), when reversing bar (15) is in commutation housing (14) left end, intake pipe (24) communicates with the right through hole (20) of commutation housing (14) below, when reversing bar (15) is in commutation housing (14) right-hand member, intake pipe (24) communicates with the left through hole (19) of commutation housing (14) below, commutation housing (14) two ends are fixed with the left side in band silk hole (25) respectively, right end cap (16,17);

C, commutation controlling mechanism (3) is by a left side, right commutation control housing (28,34), a left side, right controlling rod (29,35), reversing tube A, B, C, D, E, F (30,36,37,38,39,40) form, left side commutation control housing (28) sidewall is respectively by reversing tube A, B, C (30,36,37) is communicated with intake pipe (24), the left end cap (16) and the low pressure water injection pipe (23) of commutation housing (14), right commutation control housing (34) sidewall is respectively by reversing tube D, E, F (38,39,40) be communicated with intake pipe (24), the right end cap (17) and the low pressure water injection pipe (23) of commutation housing (14), a left side, right controlling rod (29,35) place a left side respectively, right commutation control housing (28,34) in, a left side, right commutation control housing (28,34) is separately fixed at the two ends of the pump housing (4) in the branch press mechanism (1), a left side, right controlling rod (29,35) be connected to combined type double crosslinking piston (6) two ends and with combined type double crosslinking piston (6) servo-actuated.

2. differential pressure drive reciprocating double-action booster pump according to claim 1 is characterized in that: the left and right sides chamber inner wall of the pump housing (4) all is equipped with cylinder sleeve (31).

3. differential pressure drive reciprocating double-action booster pump according to claim 1 is characterized in that: the top of commutation housing (14) has peep hole and plug (32) is housed in this peep hole.

4. differential pressure drive reciprocating double-action booster pump according to claim 1, it is characterized in that: left and right one-way valve (9,10) Shang Fang left and right passage (7,8) communicates with right chamber right-hand member and left chamber's left end respectively by external connecting tube a, b (26,27).

5. differential pressure drive reciprocating double-action booster pump according to claim 1 is characterized in that: left and right commutation control housing (28,34) adopts flange to be connected with the two ends of the pump housing (4) respectively.

6. differential pressure drive reciprocating double-action booster pump according to claim 1 is characterized in that: left and right controlling rod (29,35) is connected with the two ends of combined type double crosslinking piston (6) tenon, the groove by T-shape respectively.

7. differential pressure drive reciprocating double-action booster pump according to claim 1, it is characterized in that: commutation housing (14) stacks in the pump housing (4) top and fixing by bolt (41), left and right through hole (19,20) respectively with left and right passage (7,8) correspondence, left and right passage (7,8) be stepped, left and right one-way valve (9,10) places in the left and right passage (7,8) and compacted cover (42) compresses.

8. according to claim 1,4 or 7 described differential pressure drive reciprocating double-action booster pumps, it is characterized in that: a left side, right one-way valve (9,10) and a left side, right High Pressure Drain pump valve (11,12) structure is identical, by valve seat (43), nonreturn valve core (44), spring (45), valve pocket (46) and nut (47) are formed, the middle part of valve seat (43) has water passage hole (48), nonreturn valve core (44) passes valve seat (43) and valve pocket (46) is fixing by nut (47), nonreturn valve core (44) can relatively move along the center hole of valve seat (43), and spring (45) places between valve pocket (46) and the valve seat (43).

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