CN214466343U

CN214466343U - Self-control check valve

Info

Publication number: CN214466343U
Application number: CN202120538050.0U
Authority: CN
Inventors: 陈锦标
Original assignee: Beijing Valve General Factory Co ltd
Current assignee: Beijing Valve General Factory Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-10-22
Anticipated expiration: 2031-03-15

Abstract

The utility model provides an automatic control check valve, which comprises a valve body, a valve seat arranged in the valve body, a valve clack, an automatic control structure and a water hammer absorption unit; the valve clack can rotate to be matched with or separated from the valve seat, and correspondingly cuts off or allows the medium to flow in the channel; the automatic control structure comprises a piston cavity constructed on the valve body, a piston arranged in the piston cavity in a sliding manner, and a transmission unit arranged between the piston and the valve clack; the piston cavity comprises a conical hole section and a straight hole section which are connected in series, so that the piston has different sliding speeds, and the valve clack is correspondingly driven to have different rotating speeds, so that the water hammer pressure is prevented from forming a peak value; the water hammer absorption unit comprises a water hammer absorption disc arranged on the valve body in a sliding mode and an elastic piece abutted between the water hammer absorption disc and the valve body. The utility model discloses a time is opened and closed in regulation that automatic control check valve can be convenient to elimination water hammer pressure that can be better effectively improves pump station system's security.

Description

Self-control check valve

Technical Field

The utility model relates to a valve equipment technical field, in particular to automatic control check valve.

Background

A large number of valves are required to be arranged on medium conveying pipelines in the fields of water conservancy, hydropower, sewage treatment, seawater desalination and the like, check valves are generally required to be arranged on pipelines which need to prevent media from flowing backwards, and the check valves can be automatically opened when the media flow forwards and can be automatically closed when the media flow backwards; because the opening or closing of the existing check valve depends on the acting force of the medium on the valve clack, the opening or closing time of the existing check valve is difficult to control; when the opening or closing time of the check valve needs to be controlled, an additional hydraulic control system needs to be arranged, the cost of pipeline arrangement is increased, and the energy consumption is increased by the hydraulic control system.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a self-control check valve, which can increase the opening or closing speed of the check valve.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a self-control check valve, includes the valve body, be equipped with the passageway that supplies the medium circulation in the valve body, be equipped with the disk seat in the passageway, its characterized in that, self-control check valve still includes:

the valve clack is rotatably arranged on the valve body, can rotate to be matched with the valve seat or separated from the valve seat, and correspondingly cuts off or allows the medium to flow in the channel;

the automatic control structure comprises a piston cavity, a piston, a first guide pipe and a second guide pipe, wherein the piston cavity is constructed on the valve body, the piston is arranged in the piston cavity in a sliding mode and divides the piston cavity into an upper cavity and a lower cavity, the first guide pipe is arranged between the input end of the channel and the lower cavity, the second guide pipe is arranged between the output end of the channel and the upper cavity, the automatic control structure further comprises a transmission unit, the transmission unit is arranged between the piston and the valve clack, the valve clack is driven to rotate in a direction matched with the valve seat when the piston moves downwards, and the valve clack is driven to rotate in a direction separated from the valve seat when the piston moves upwards; and the first conduit and the second conduit are respectively provided with a flow regulating valve.

Further, the piston cavity includes the taper hole section and the straight hole section that concatenate from top to bottom, and follows from last direction extremely down, the cross-section of taper hole section diminishes and sets up, just the diameter of the footpath end of taper hole section with the diameter of straight hole section equals.

Furthermore, the transmission unit comprises a piston rod coaxially and fixedly connected with the bottom end of the piston, and a connecting rod, one end of the connecting rod is hinged with the bottom end of the piston rod, and the other end of the connecting rod is hinged with the valve clack.

Furthermore, a water hammer accommodating cavity is formed in the valve body, and the top end of the piston rod penetrates through the water hammer accommodating cavity and then extends into the piston cavity; the utility model discloses a hydraulic ram, including water hammer absorption chamber, piston rod, water hammer absorption chamber, water hammer, and water hammer absorption chamber, water hammer, and be equipped with the elastic component between the roof.

Furthermore, the elastic part is a spring sleeved on the piston rod.

Furthermore, two pressure gauges are arranged on the valve body and are respectively used for detecting the pressure in the input end and the output end of the channel.

Furthermore, a limiting device is arranged on the valve clack and used for keeping the valve clack and the valve seat in a matched mode.

Further, the valve body is including dismantling the left valve casing and the right valve casing that link firmly, right side valve casing, be used for with the terminal surface slope setting that left side valve casing laminated mutually, the disk seat is located in the right side valve casing, just the axis of the hole of disk seat with the left side terminal surface quadrature of right side valve casing sets up, the piston chamber reaches the valve clack is located in the left side valve casing.

Furthermore, the included angle alpha between the left side end surface of the right valve shell and the medium flowing direction is 25-35 degrees.

Further, the left end face of the right valve casing forms an included angle alpha of 30 degrees with the medium flowing direction.

Compared with the prior art, the utility model discloses following advantage has:

the self-control check valve is characterized in that the self-control check valve comprises a piston, a first guide pipe, a second guide pipe and a transmission unit, wherein the piston is arranged in the piston cavity in a sliding manner, the first guide pipe is arranged between the input end of a channel and a lower cavity, the second guide pipe is arranged between the output end of the channel and an upper cavity, and the transmission unit is arranged between the piston and a valve clack, so that a pumping pressure medium can be input into the lower cavity through the first guide pipe, the piston is driven to move upwards to drive the valve clack to be opened, and a pumping stop pressure medium can be input into the upper cavity through the second guide pipe to drive the piston to move downwards to drive the valve clack to be closed; and through the flow regulating valve that sets up on first pipe and second pipe, can adjust the flow that gets into upper chamber and cavity down to need not additionally to set up the hydraulic control system and can realize opening the valve and close the regulation of valve time, can sparingly arrange the extra cost that the hydraulic control system brought, and save the energy resource consumption of hydraulic control system.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a cross-sectional view of a self-controlled check valve according to a first embodiment of the present invention;

fig. 2 is a right side view of the self-controlled check valve according to the first embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 at A;

fig. 4 is a partially enlarged view of fig. 1 at B.

Description of reference numerals:

1-valve body, 11-right valve shell, 12-left valve shell, 13-bolt, 14-rotating shaft, 101-piston cavity, 1011-taper hole section, 1012-straight hole section, 102-water hammer absorption cavity, 2-valve seat, 3-valve clack, 31-mounting plate, 32-claw, 4-piston, 41-piston rod, 5-first conduit, 6-second conduit, 7-connecting rod, 8-water hammer absorption disk and 9-elastic piece.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example one

The present embodiment relates to a self-controlled check valve, which is shown in fig. 1 and 2, and comprises a valve body 1, a channel for medium to flow through is arranged in the valve body 1, and a valve seat 2 is arranged in the channel; the self-control check valve also comprises a valve clack 3 and a self-control structure; the valve clack 3 is rotatably arranged on the valve body 1, and the valve clack 3 can rotate to be matched with the valve seat 2 or be separated from the valve seat 2, and correspondingly cuts off or allows the medium to flow in the channel.

The automatic control structure comprises a piston cavity 101 arranged on the valve body 1, a piston 4 which is arranged in the piston cavity 101 in a sliding way and divides the piston cavity 101 into an upper cavity and a lower cavity, a first conduit 5 arranged between the input end of a channel and the lower cavity, a second conduit 6 arranged between the output end of the channel and the upper cavity, and a transmission unit arranged between the piston 4 and the valve clack 3; through the transmission of the transmission unit, the downward movement of the piston 4 can drive the valve clack 3 to rotate towards the direction matched with the valve seat 2, and the upward movement of the piston 4 can drive the valve clack 3 to rotate towards the direction separated from the valve seat 2; and flow regulating valves are respectively arranged on the first conduit 5 and the second conduit 6.

Valve body 1 of this embodiment is shown including dismantling left valve casing 12 and the right valve casing 11 that links firmly, referring to fig. 1, left valve casing 12 and right valve casing 11 all are cylindricly, and both series connection, and above-mentioned passageway that supplies the medium circulation has been constituted jointly to inner chamber between them. Wherein, a structure that left valve casing 12 and right valve casing 11 can dismantle and link firmly is shown in fig. 1, has constructed a plurality of screw holes on right valve casing 11 to set up the through-hole with each screw hole one-to-one on left valve casing 12, constitute the connection of dismantling between left valve casing 12 and right valve casing 11 with the mode of screw connection of screw hole through the through-hole and with screw hole by bolt 13. Obviously, the way of detachable connection between the left valve housing 12 and the right valve housing 11 is not limited to this, and for example, a threaded hole may be provided on the left valve housing 12, and a through hole may be provided on the right valve housing 11; or a plurality of groups of opposite mounting holes can be arranged on the left valve shell 12 and the right valve shell 11, and the detachable connection between the left valve shell 12 and the right valve shell 11 is formed by adopting a mode that the bolts 13 penetrate through the opposite mounting holes and are screwed with nuts.

In the present embodiment, referring to fig. 1, the left end surface of the right valve housing 11 for abutting against the left valve housing 12 is disposed obliquely, and the valve seat 2 is disposed on one left end of the right valve housing 11; and the axis of the inner hole of the valve seat 2 is orthogonal to the left end surface of the right valve shell 11, or the axis of the inner hole of the valve seat 2 is parallel to the normal of the left end surface of the right valve shell 11.

Through setting up valve body 1 to including dismantling left valve casing 12 and the right valve casing 11 that links firmly, make things convenient for the installation of following drive unit and valve clack 3, set up to the slope through the left side terminal surface with right valve casing 11, and set up disk seat 2 according to foretell structure, the flow cross-section area that can make 2 holes of disk seat is close to the flow cross-section area of passageway when not setting up disk seat 2, that is to say, through setting up valve body 1 and disk seat 2 according to foretell structure, can reduce disk seat 2 to the resistance that the medium circulated in the passageway and caused, also can reduce the power consumption of carrying the medium, improve user's benefit.

The embodiment provides a reasonable structure for arranging the valve seat 2, and particularly, referring to fig. 1, an included angle alpha between the axis of the inner hole of the valve seat 2 and the flowing direction of the medium in the channel is 25-35 degrees. The included angle α may be, for example, any one of 25 °, 26 °, 27 °, 28 °, 29 °, 30 °, 31 °, 32 °, 33 °, 34 °, and 35 °; any other value of 25 to 35 is also possible and the angle alpha is preferably 30.

Referring to fig. 1, a piston chamber 101 of the present embodiment is provided on the left valve housing 12, and the piston 4 is slidably provided in the piston chamber 101 and divides the piston chamber 101 into an upper chamber and a lower chamber having variable volumes; the above-mentioned first conduit 5 is arranged between the lower chamber and the inner cavity of the right valve housing 11 (i.e. the inlet end of the passage) for establishing communication between the inner bore of the right valve housing 11 and the lower chamber; the second conduit 6 described above is provided between the upper chamber and the inner cavity of the left valve housing 12 (i.e. the outlet end of the passage) for establishing communication between the inner cavity of the left valve housing 12 and the upper chamber.

In this embodiment, the flow regulating valves arranged on the first conduit 5 and the second conduit 6 both adopt needle valves for respectively and correspondingly regulating the flow rates of the first conduit 5 and the second conduit 6; it should be noted that the needle valve may be made of a commercially available product, and the structure and the flow regulation principle are not described in detail here.

One preferred structure of the valve flap 3 rotatably disposed on the valve body 1 is shown in fig. 1 and 2, a mounting hole is formed through the left valve housing 12, and a rotating shaft 14 is fixedly inserted in the mounting hole; and the back of the valve clack 3 is fixedly provided with a mounting plate 31, and the mounting plate 31 is provided with a sleeving hole which can be rotatably sleeved on the rotating shaft 14, so that the rotation of the valve clack 3 on the shell is formed. Obviously, the structure of the valve flap 3 rotatably disposed on the valve body 1 is not limited thereto, and for example, the rotating shaft may be rotatably disposed in the mounting hole, and the sleeving hole is fixedly sleeved on the rotating shaft.

Referring to fig. 1, the transmission unit of the present embodiment includes a piston rod 41 coaxially and fixedly connected to the bottom end of the piston 4, and a connecting rod 7 having one end hinged to the bottom end of the piston rod 41 and the other end hinged to the valve flap 3. The hinge structure between the connecting rod 7 and the piston rod 41, and the hinge structure between the connecting rod 7 and the valve flap 3 can refer to the prior art, and are not described in detail herein. Obviously, when the piston 4 slides upwards, the valve clack 3 rotates clockwise through the transmission of the connecting rod 7, and the inner hole of the valve seat 2 can be opened to allow the medium to circulate in the channel. When the piston 4 slides downwards, the valve clack 3 rotates anticlockwise through the transmission of the connecting rod 7, and the valve clack 3 rotates to a position matched with the valve seat 2 as shown in figures 1 and 2, so that the circulation of the medium in the channel is cut off.

In this embodiment, the valve flap 3 is provided with a position limiting device for keeping the valve flap 3 and the valve seat 2 in a matched manner. Referring to fig. 1 and 3, the limiting device of the present embodiment includes a finger 32 having one end fixed to the back of the valve flap 3, and the other end of the finger 32 can be stopped by the valve seat 2 when the valve flap 3 is engaged with the valve seat 2, thereby limiting further rotation of the valve flap 3.

The opening process of the self-controlled check valve of the embodiment is as follows:

after the external delivery pump is started, a medium enters the lower chamber through the first conduit 5, pushes the piston 4 to move upwards, and drives the valve clack 3 to rotate towards the direction of opening the inner hole of the valve seat 2, so that the pilot function of valve opening is realized; the adjustment of the opening time of the self-regulating non-return valve is achieved by adjusting the flow of the medium through the first conduit 5 into the lower chamber by means of a flow regulating valve, in particular the greater the flow of the medium which is allowed to pass through by the flow regulating valve, the faster the movement speed of the piston 4 and the longer the opening time of the self-regulating non-return valve.

The closing process of the self-controlled check valve is the same as the opening process thereof, and the detailed description thereof is omitted.

In summary, in the self-control check valve of the present embodiment, through the piston cavity 101, the piston 4 slidably disposed in the piston cavity 101, the first conduit 5 disposed between the input end of the passage and the lower chamber, the second conduit 6 disposed between the output end of the passage and the upper chamber, and the transmission unit disposed between the piston 4 and the valve flap 3, the pumping pressure medium can be input into the lower chamber through the first conduit 5, so as to drive the piston 4 to move upward, thereby driving the valve flap 3 to open, and the pumping stop pressure medium can be input into the upper chamber through the second conduit 6, thereby driving the piston 4 to move downward, thereby driving the valve flap 3 to close; and through the flow regulating valve that sets up on first pipe 5 and second pipe 6, can adjust the flow that gets into upper chamber and cavity down to need not additionally to set up the hydraulic control system and can realize opening the valve and close the regulation of valve time, can sparingly arrange the extra cost that the hydraulic control system brought, and save the energy resource consumption of hydraulic control system.

Example two

The present embodiment relates to a self-controlling check valve having substantially the same structure as the self-controlling check valve described in the first embodiment, except that: referring to fig. 1 and 4, the piston chamber 101 of the present embodiment includes a tapered bore section 1011 and a straight bore section 1012 connected in series, and the tapered bore section 1011 has a gradually decreasing cross-section along the top-to-bottom direction, and the diameter of the small diameter end of the tapered bore section 1011 is equal to the diameter of the straight bore section 1012.

By configuring the piston cavity 101 according to the above structure, the piston 4 will have different sliding speeds when sliding in the piston cavity 101, specifically, the sliding speed of the piston 4 in the tapered hole section 1011 is faster than the sliding speed of the piston 4 in the straight hole section 1012; that is, when the piston 4 slides downward to close the valve flap 3, the valve flap 3 has a faster rotational speed in the first half and a slower rotational speed in the second half; by setting the first half and the second half with different rotation speeds, compared with the case that the valve clack 3 rotates at a slow speed in the whole process, the scheme of the embodiment can improve the closing speed of the valve clack 3; compared with the valve clack 3 which rotates fast in the whole process, the scheme of the embodiment can play the roles of reducing pressure fluctuation in the pipeline and reducing pin water hammer.

The present embodiment provides a specific setting structure, taking an included angle α between a normal line of an inner hole of the valve seat 2 and a flowing direction of a medium in a channel as an example of 30 °, a rotation angle of the valve flap 3 from opening of the valve seat 2 to closing of the valve seat 2 is 60 °, wherein lengths of the tapered hole section 1011 and the straight hole section 1012 are set as follows: when the piston 4 slides from the top end to the bottom end of the taper hole section 1011, the angle of the valve clack 3 is 40 degrees; when the piston 4 slides from the top end of the straight bore section 1012 to the bottom end of the straight bore section 1012, the valve flap 3 rotates through an angle of 20 °.

In conclusion, the self-control check valve of the embodiment can take the closing time of the valve into consideration, and can reduce pressure fluctuation in the pipeline and reduce water hammer.

EXAMPLE III

The present embodiment relates to a self-controlling check valve having substantially the same structure as the self-controlling check valve described in the second embodiment, except that: referring to fig. 1, in the present embodiment, a water hammer accommodating chamber 102 is formed in the valve body 1, and the top end of the piston rod 41 extends into the piston chamber 101 after passing through the water hammer accommodating chamber 102; a plurality of intercommunicating pores have been seted up on the diapire in water hammer absorption chamber 102 for constitute the intercommunication between water hammer absorption chamber 102 and passageway, and be equipped with water hammer absorption dish 8 in water hammer absorption chamber 102, on piston rod 41 was located to water hammer absorption dish 8 slip cap, the periphery of water hammer absorption dish 8 and the lateral wall butt in water hammer absorption chamber 102, and be equipped with elastic component 9 between the roof in water hammer absorption dish 8 and water hammer absorption chamber 102.

In the present embodiment, referring to fig. 1, a mounting portion is formed on the top of the valve body 1, an inner hole with an open top end is formed inside the mounting portion, a cylinder block is detachably mounted on the top end of the mounting portion, the bottom end of the cylinder block closes the open top end of the inner hole, the inner hole forms the aforementioned water hammer accommodating chamber 102, and the aforementioned piston chamber 101 is formed in the cylinder block. By forming the piston chamber 101 and the water hammer accommodating chamber 102 in this manner, the arrangement of the piston chamber 101 and the water hammer accommodating chamber 102 is facilitated, and the structure of the valve body 1 can be simplified.

Referring to fig. 1, the communication holes are formed through the bottom wall of the inner hole, and the medium introduced into the left valve housing 12 can be introduced into the water hammer accommodating chamber 102 through the communication holes. The aforesaid water hammer take-up disc 8 slip cap is established on piston rod 41, and is provided with two sealing washers between water hammer take-up disc 8 and piston rod 41, a sealed for constituting between water hammer take-up disc 8 and the piston rod 41, the periphery of water hammer take-up disc 8 and the inner wall butt of water hammer take-up chamber 102, and be equipped with two sealing washers between the periphery of water hammer take-up disc 8 and the inner wall of water hammer take-up chamber 102, a sealed for constituting between water hammer take-up disc 8 and the water hammer take-up chamber 102 inner wall. The elastic member 9 is a spring fitted around the piston rod 41 and abutting between the water hammer accommodating plate 8 and the bottom surface of the cylinder block.

When the self-control check valve works, after the pump body for conveying the medium is closed, the impact force generated by the backflow of the medium in the pipeline enters the inner cavity of the left valve shell 12, the water hammer absorbing disc 8 is pushed to compress the spring upwards, so that the impact force of the medium is eliminated, and the pipeline can be prevented from being damaged due to the impact.

In summary, the self-control check valve of the present embodiment, through the arrangement of the water hammer absorption disc 8 and the staged rotation of the valve flap 3, the linkage of the two can effectively eliminate the irregular water hammer oscillation, so that the pressure rise of the water hammer is greatly alleviated, and the damage of the pressure wave energy of the water hammer to the pipeline can be reduced.

Example four

The present embodiment relates to a self-controlling check valve having substantially the same structure as the self-controlling check valve described in the first to third embodiments, except that: in this embodiment, referring to fig. 1, two pressure gauges are provided on the valve body 1, and are respectively used for detecting pressures in the input end and the output end of the channel; so that the pressure inside the valve body 1 can be easily known by the operator.

EXAMPLE five

The present embodiment relates to a self-controlling check valve having substantially the same structure as the self-controlling check valve described in the third embodiment, except that: in this embodiment, the elastic member 9 abuts between the water hammer accommodating disc 8 and the piston 4; that is, compared to the third embodiment in which the water hammer accommodating chamber 102 communicates with the piston chamber 101 and constitutes the piston chamber of the present embodiment, the present embodiment can arrange a long elastic member with the same outer shape dimension.

The working process of the self-control check valve of the embodiment is as follows: when a pump body for conveying a medium is opened, the medium enters between the water hammer absorption disc 8 and the piston 4 through the first guide pipe 5 to drive the piston 4 to move upwards, and the opening of the self-control check valve is completed; when the pump body is closed, a medium enters the upper chamber through the second guide pipe 6, the piston 4 is pushed to move downwards, the piston 4 moves downwards to drive the valve clack 3 to rotate towards the direction of closing the self-control check valve, the medium reflows in the pipeline along with the closing of the valve clack 3 to generate impact force, and at the moment, the impact force of the medium pushes the water hammer absorption disc 8 to compress the elastic piece 9 and move upwards to absorb the impact force of the medium; the water hammer absorbing disc applies certain resistance to the piston 4 through the elastic piece 9, the downward moving speed of the piston 4 is delayed, the closing speed of the valve clack 3 is slowed down, and the impact of the water hammer on a pipeline is avoided. When the water hammer disappears, the piston compresses the elastic piece due to the pushing of the medium to the valve clack and the piston, the elastic piece drives the water hammer absorption disc to move to the bottommost end of the piston cavity, and the piston can keep compressing the elastic piece, so that the valve clack is kept closed.

In summary, in the third embodiment, the capability of the water hammer absorption disc 8 to absorb the water hammer is fixed, and if the impact force of the water hammer is too large, the medium pipeline is still damaged to a certain extent. Compared with the above, in the scheme of this embodiment, when the impact force of the water hammer is too large, on one hand, the water hammer absorption disc 8 can have a longer stroke, so that the water hammer absorption disc 8 has a stronger ability of absorbing the impact force of the water hammer, and on the other hand, the water hammer absorption disc 8 can also act on the piston 4 to delay the downward movement speed of the piston 4, slow down the closing speed of the valve flap 3, and further reduce the impact of the water hammer on the pipeline.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a self-control check valve, includes the valve body, be equipped with the passageway that supplies the medium circulation in the valve body, be equipped with the disk seat in the passageway, its characterized in that, self-control check valve still includes:

2. The self-controlling check valve of claim 1, wherein: the piston cavity comprises a conical hole section and a straight hole section which are connected in series from top to bottom, the cross section of the conical hole section is gradually reduced, and the diameter of the small-diameter end of the conical hole section is equal to that of the straight hole section.

3. The self-controlling check valve of claim 1, wherein: the transmission unit comprises a piston rod coaxially and fixedly connected with the bottom end of the piston, and a connecting rod, one end of the connecting rod is hinged with the bottom end of the piston rod, and the other end of the connecting rod is hinged with the valve clack.

4. The self-controlling check valve of claim 3, wherein: a water hammer accommodating cavity is formed in the valve body, and the top end of the piston rod penetrates through the water hammer accommodating cavity and then extends into the piston cavity; the utility model discloses a hydraulic ram, including water hammer absorption chamber, piston rod, water hammer absorption chamber, water hammer, and water hammer absorption chamber, water hammer, and be equipped with the elastic component between the roof.

5. The self-controlling check valve of claim 4, wherein: the elastic part is a spring sleeved on the piston rod.

6. The self-controlling check valve of claim 1, wherein: and the valve body is provided with two pressure gauges which are respectively used for detecting the pressure in the input end and the output end of the channel.

7. The self-controlling check valve of claim 1, wherein: and the valve clack is provided with a limiting device for keeping the valve clack and the valve seat in a matched manner.

8. The self-controlling check valve according to any one of claims 1 to 7, wherein: the valve body is including dismantling the left valve casing and the right valve casing that link firmly, right side valve casing, be used for with the terminal surface slope setting that left side valve casing laminated mutually, the disk seat is located in the right side valve casing, just the axis of the hole of disk seat with the left side terminal surface quadrature of right side valve casing sets up, the piston chamber reaches the valve clack is located in the left side valve casing.

9. The self-controlling check valve of claim 8, wherein: and the included angle alpha between the left end surface of the right valve shell and the medium flowing direction is 25-35 degrees.

10. The self-controlling check valve of claim 9, wherein: and the included angle alpha between the left end surface of the right valve shell and the medium flowing direction is 30 degrees.