A pipeline self-regulating pump control valve

Abstract

This invention discloses a pipeline self-regulating pump control valve, comprising: a valve body having a main channel for liquid flow and a pressure relief channel communicating with the main channel; a main valve plate for controlling the opening and closing of the main channel is installed in the main channel; a control rod passing through the pressure relief channel and having its bottom end entering the main channel; a control component for driving its lifting and lowering is connected to the top of the control rod, and a secondary valve plate is provided in the middle; wherein, the main valve plate has a fully closed position and a fully open position; when the main valve plate moves from the fully closed position to the fully open position, it can drive the control rod to rise; when the main valve plate is in the fully open position or the fully closed position, the secondary valve plate can cut off the communication between the main channel and the pressure relief channel. The pipeline self-regulating pump control valve according to the embodiment of this invention has a simple structure, few internal structural components, and is convenient for inspection and maintenance. Furthermore, during pump start-up and pump stop-up, it can automatically release pressure through a bypass valve, reducing water hammer during pump start-up and pump stop-up, and eliminating the risk of pump reversal during pump stop-up.

Description

Technical Field

[0001] This invention relates to the field of pipeline control valve technology, and in particular to a pipeline self-operated pump control valve. Background Technology

[0002] Currently, check valves installed at pump outlets for backflow prevention and water hammer reduction, whether conventional butterfly slow-closing check valves or shut-off or butterfly multi-functional pump control valves, all employ a method of first quickly closing to cut off most of the backflow in the main pipe, and then slowly closing to release the backflow pressure. This achieves backflow prevention and water hammer reduction when the pump stops, through a single-plate two-stage or double-valve-plate two-stage closing mechanism. During the slow-closing process, the high-pressure medium at the valve outlet flows back at high speed in the pipeline from the pump outlet to the pump inlet. This type of valve still carries the risk of the backflow medium driving the pump in reverse, or even causing it to enter turbine power generation mode, leading to damage to the pump and motor.

[0003] Existing check valve products primarily focus on pump shutdown water hammer, neglecting pump startup water hammer. In actual operation, this can lead to accidents such as expansion joint detachment and pipeline displacement caused by startup water hammer. Furthermore, existing shut-off or butterfly-type multi-functional pump control valves have complex flow channels and numerous internal structural components, resulting in difficult maintenance and high water loss during valve operation. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pipeline self-regulating pump control valve, which has a simple structure and is convenient for inspection and maintenance; it has few structural components in the flow channel and low flow loss; during the pump start-up and pump shutdown stages, it can automatically release pressure through the bypass valve to reduce water hammer during pump start-up and pump shutdown, thereby effectively eliminating the risk of pump reversal when the pump is stopped.

[0005] According to an embodiment of the present invention, a pipeline self-regulating pump control valve includes: a valve body having a main channel for liquid flow and a pressure relief channel communicating with the main channel; a main valve plate for controlling the opening and closing of the main channel is installed in the main channel; a control rod passing through the pressure relief channel and having its bottom end entering the main channel; a control component for driving its lifting and lowering is connected to the top of the control rod, and a secondary valve plate is provided in the middle; wherein, the main valve plate has a fully closed position and a fully open position, and when the main valve plate moves from the fully closed position to the fully open position, it can drive the control rod to rise; when the main valve plate is in the fully open position or the fully closed position, the secondary valve plate can cut off the communication between the main channel and the pressure relief channel.

[0006] The pipeline self-regulating pump control valve according to embodiments of the present invention has at least the following beneficial effects:

[0007] By setting up a pressure relief channel connected to the main channel, pressure can be automatically released through the pressure relief channel during both pump start-up and pump shutdown, thereby reducing water hammer generated during pump start-up and shutdown and eliminating the risk of pump reversal when the pump stops; the pressure relief channel has fewer structural components and a simple internal structure of the valve body, which can effectively improve service life and reduce production costs; the control components are located outside the valve body, which facilitates online inspection and maintenance.

[0008] According to some embodiments of the present invention, the pressure relief channel includes:

[0009] The liquid inlet chamber is provided with a liquid inlet that communicates with the main channel;

[0010] The liquid outlet chamber is equipped with a liquid outlet;

[0011] A volumetric cavity is provided between the inlet cavity and the outlet cavity to connect the inlet cavity and the outlet cavity, and the auxiliary valve plate is movable within the volumetric cavity.

[0012] According to some embodiments of the present invention, a lower valve seat is provided at the connection between the volume chamber and the liquid inlet chamber, and an upper valve seat is provided at the connection between the volume chamber and the liquid outlet chamber. When the main valve plate is in the fully closed position, the secondary valve plate abuts against the lower valve seat to cut off the communication between the volume chamber and the liquid inlet chamber; when the main valve plate is in the fully open position, the secondary valve plate abuts against the upper valve seat to cut off the communication between the volume chamber and the liquid outlet chamber.

[0013] According to some embodiments of the present invention, the control component includes:

[0014] A cavity container with an internal cavity;

[0015] A lifting structure is installed in the inner cavity; the top of the control rod is connected to the lifting structure.

[0016] According to some embodiments of the present invention, the lifting structure divides the inner cavity into an upper chamber and a lower chamber, the main channel has an inlet end and an outlet end, the lower chamber is connected to the inlet end of the main channel, and the upper chamber is connected to the outlet end of the main channel.

[0017] According to some embodiments of the present invention, the main valve plate has a water-facing surface and a water-returning surface, the water-facing surface facing the inlet end, and the water-returning surface being provided with a protrusion protruding from its surface. When the main valve plate is in the fully closed position, the bottom of the control rod abuts against the protrusion.

[0018] According to some embodiments of the present invention, a stop ring extending upward into the lower chamber is provided on the top of the valve body, and a central channel connecting the lower chamber and the liquid outlet chamber is provided at the center of the stop ring.

[0019] According to some embodiments of the present invention, an annular plate extending toward the center is provided at the bottom of the central channel, and the control rod passes through the central channel and is sealed to the annular plate.

[0020] According to some embodiments of the present invention, the top of the control lever is provided with a radially protruding buffer step, which can be embedded in the central channel and sealed to the inner wall of the central channel to form a buffer cavity between the bottom of the buffer step and the top of the annular plate; the buffer cavity communicates with the inlet end of the main channel to slow down the descent speed of the control lever.

[0021] According to some embodiments of the present invention, the main valve plate is tilted when it is in the fully closed position.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram showing the positions of each component when the main valve plate is in the fully closed position according to a new embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram showing the positions of various components when the pump is started according to a new embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram showing the positions of each component when the main valve plate is opened according to a novel embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram showing the positions of each component when the main valve plate is in the fully open position according to a novel embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram showing the positions of various components when the pump is stopped according to a new embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram showing the positions of various components during the reset process of the control lever according to a novel embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the control component according to another embodiment of the present invention;

[0031] Figure 8 for Figure 6 Enlarged view of point A in the middle;

[0032] Figure 9 for Figure 6 Enlarged view of point B in the middle.

[0033] Icon labels:

[0034] Valve body 100, main valve body 101, pressure relief valve body 102, main channel 110, inlet end 111, outlet end 112, pressure relief channel 120, liquid inlet chamber 121, liquid outlet chamber 122, volume chamber 123, upper valve seat 124, lower valve seat 125, main valve plate 130, water-facing surface 131, water-returning surface 132, protrusion 133, stop ring 140, buffer chamber 141, annular plate 150;

[0035] Control lever 200, auxiliary valve plate 210, buffer shaft step 220;

[0036] Control component 300, cavity container 310, upper chamber 311, lower chamber 312, lifting structure 320, first connecting pipe 330, second connecting pipe 340, buffer pipe 341, and quick-closing pipe 342. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0039] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0040] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0041] Reference Figures 1 to 9 An embodiment of the present invention provides a pipeline self-regulating pump control valve, comprising a valve body 100 and a control rod 200 vertically inserted within the valve body 100.

[0042] Valve body 100 has a main channel 110 for liquid flow and a pressure relief channel 120 communicating with the main channel 110. A main valve plate 130 for controlling the opening and closing of the main channel 110 is installed inside the main channel 110; specifically, refer to Figure 1 As shown, the valve body 100 includes a main valve body 101 and a pressure relief valve body 102, with the pressure relief valve body 102 mounted above the main valve body 101. An opening is provided above the main valve body 101, and a portion of the pressure relief valve body 102 is inserted into and connected to the main valve body 101. A main channel 110 is located within the main valve body 101, and a pressure relief channel 120 is located within the pressure relief valve body 102. A control lever 200 passes through the pressure relief channel 120 and its bottom end enters the main channel 110. A control assembly 300 for driving the lever's lifting and lowering is connected to the top of the control lever 200, and a secondary valve plate 210 is provided in the middle.

[0043] The main valve plate 130 has a fully closed position and a fully open position. When the main valve plate 130 moves from the fully closed position to the fully open position, it can drive the control lever 200 to rise. When the main valve plate 130 is in the fully open or fully closed position, the auxiliary valve plate 210 can cut off the connection between the main channel 110 and the pressure relief channel 120. Specifically, the main channel 110 has an inlet end 111 and an outlet end 112. The fully closed position means that the main valve plate 130 is in a position where the connection between the inlet end 111 and the outlet end 112 is completely cut off. The fully open position means that the main valve plate 130 is in a position where the connection area between the inlet end 111 and the outlet end 112 is maximized.

[0044] In some embodiments of the present invention, the main valve plate 130 adopts an airfoil-shaped cross-section structure. Its specific structure can be referred to in the airfoil-shaped cross-section butterfly plate of application number CN202021593298.9. The airfoil-shaped design can effectively reduce the head loss of liquid flowing through the valve. A valve shaft rotating around its own axis passes through the valve body 100, and the main valve plate 130 is drive-connected to the valve shaft. It should be noted that the connection point between the valve shaft and the main valve plate 130 is not located at the center of the main valve plate 130, but rather at a position slightly above the center. For ease of expression, the main valve plate 130 is divided into a narrow section and a wide section, using the valve shaft as a dividing line; refer to... Figure 1 As shown, the main valve plate 130 is in the fully closed position at this time, with the narrow section above the valve shaft and the wide section below the valve shaft. When the main valve plate 130 is in the fully closed position, it is tilted, with its narrow section closer to the inlet end 111 and its wide section closer to the outlet end 112. When the pump starts, the water pressure will push the wide section of the main valve plate 130 to rotate clockwise around the valve shaft (refer to the clockwise direction in the attached figure), thereby moving the main valve plate 130 from the fully closed position to the fully open position.

[0045] In some embodiments of the present invention, the main valve plate 130 has a water-facing surface 131 and a water-returning surface 132. The water-facing surface 131 faces the inlet end 111, and the water-returning surface 132 is provided with a protrusion 133 protruding from its surface. When the main valve plate 130 is in the fully closed position, the bottom of the control rod 200 abuts against the protrusion 133. Specifically, the valve shaft is also connected to the water-returning surface 132 of the main valve plate 130. The main valve plate 130 has an airfoil-shaped cross-section, which can effectively reduce the head loss when the liquid medium flows through it when the main valve plate 130 is in the fully open position.

[0046] Furthermore, the contact structure between the bottom end of the control lever 200 and the protrusion 133 can be configured in various forms, such as: ball end form, roller form, movable hinge form, etc.; the main design idea should be to ensure that when the control lever 200 abuts against the protrusion 133 to limit the opening speed of the main valve plate 130, the control lever 200 bears as much axial thrust as possible, and bears little or no radial thrust that will generate bending moment.

[0047] In some embodiments of the present invention, the pressure relief channel 120 includes:

[0048] The liquid inlet chamber 121 is provided with a liquid inlet that communicates with the main channel 110;

[0049] The liquid outlet chamber 122 is equipped with a liquid outlet;

[0050] A volumetric cavity 123 is located between the inlet cavity 121 and the outlet cavity 122 to connect the inlet cavity 121 and the outlet cavity 122. The auxiliary valve plate 210 is movable within the volumetric cavity 123. The volumetric cavity 123 is located above the inlet cavity 121, and the outlet cavity 122 is located above the volumetric cavity 123.

[0051] Specifically, refer to Figure 1 , Figure 9 As shown, a lower valve seat 125 is provided at the connection between the volume chamber 123 and the inlet chamber 121, and an upper valve seat 124 is provided at the connection between the volume chamber 123 and the outlet chamber 122. When the main valve plate 130 is in the fully closed position, the auxiliary valve plate 210 abuts against the lower valve seat 125 to cut off the communication between the volume chamber 123 and the inlet chamber 121; when the main valve plate 130 is in the fully open position, the auxiliary valve plate 210 abuts against the upper valve seat 124 to cut off the communication between the volume chamber 123 and the outlet chamber 122. Both the upper valve seat 124 and the lower valve seat 125 are provided with through holes for the control rod 200 to pass through, and the inner diameter of the through hole is larger than the diameter of the control rod 200, but the diameter of the auxiliary valve plate 210 is larger than the inner diameter of the through hole.

[0052] Furthermore, the auxiliary valve plate 210 is fixedly connected to the control lever 200. When the main valve plate 130 is in the fully closed position, the lower surface of the auxiliary valve plate 210 abuts against and seals against the upper surface of the lower valve seat 125 to cut off the communication between the volume chamber 123 and the inlet chamber 121. When the main valve plate 130 is in the fully open position, the upper surface of the auxiliary valve plate 210 abuts against and seals against the lower surface of the upper valve seat 124 to cut off the communication between the volume chamber 123 and the outlet chamber 122. When the auxiliary valve plate 210 is located between the upper valve seat 124 and the lower valve seat 125, the inlet chamber 121 and the outlet chamber 122 are connected, and the liquid medium in the main channel 110 can enter the inlet chamber 121 and flow out from the outlet chamber 122.

[0053] In some specific embodiments of the present invention, reference is made to... Figure 9 As shown, the inlet of the liquid inlet chamber 121 is horizontally positioned, and the bottom of the liquid inlet chamber 121 is in sealed contact with the outer peripheral surface of the control rod 200. The outlet of the liquid outlet chamber 122 can be directly connected to the drainage pipe of the ditch through a pipe fitting, or it can be connected to the inlet end 111 of the main channel 110, or it can be returned to the water pump inlet pool through a pipe fitting to avoid waste caused by the discharge of medium.

[0054] In some embodiments of the present invention, the control component 300 includes:

[0055] The cavity container 310 has an internal cavity;

[0056] The lifting structure 320 is movable and installed in the inner cavity; the top of the control rod 200 is connected to the lifting structure 320.

[0057] In some embodiments of the present invention, the lifting structure 320 divides the inner cavity into an upper chamber 311 and a lower chamber 312. The lower chamber 312 is connected to the inlet end 111 of the main channel 110, and the upper chamber 311 is connected to the outlet end 112 of the main channel 110. Due to the separation by the lifting structure 320, the upper chamber 311 and the lower chamber 312 are not connected. The upper chamber 311 is connected to the outlet end 112 of the main channel 110 through a first connecting pipe 330, and the lower chamber 312 is connected to the inlet end 111 of the main channel 110 through a second connecting pipe 340. Both the first connecting pipe 330 and the second connecting pipe 340 are equipped with devices such as flow limiting valves.

[0058] In a first aspect of the present invention, reference is made to... Figures 1 to 6As shown, the cavity container 310 consists of an upper cover plate and a lower cover plate connected by bolts. The lifting structure 320 is a diaphragm, with its periphery positioned between the upper and lower cover plates. The top of the control rod 200 is connected to the center of the diaphragm. When the medium pressure in the upper chamber 311 is greater than the medium pressure in the lower chamber 312, the diaphragm will undergo elastic deformation and move downwards, thereby causing the control rod 200 to descend. When the medium pressure in the lower chamber 312 is greater than the medium pressure in the upper chamber 311, the diaphragm will undergo elastic deformation and move upwards, thereby causing the control rod 200 to rise.

[0059] In a first aspect of the present invention, reference is made to... Figure 7 As shown, the cavity container 310 is a piston cylinder, and the lifting structure 320 is a piston head that is movably and vertically installed inside the piston cylinder. The outer peripheral wall of the piston head is sealed to the inner wall of the piston cylinder, and the top of the control rod 200 is connected to the center of the piston head. When the medium pressure in the upper chamber 311 is greater than the medium pressure in the lower chamber 312, the piston head will be driven to descend along the piston cylinder wall, thereby causing the control rod 200 to descend; when the medium pressure in the lower chamber 312 is greater than the medium pressure in the upper chamber 311, the piston head will be driven to rise along the piston cylinder wall, thereby causing the control rod 200 to rise.

[0060] It is conceivable that the cavity container 310 and the lifting structure 320 are not limited to the two embodiments described above, but can also be similar structures that drive the control lever 200 to rise and fall through volume changes.

[0061] In some embodiments of the present invention, a stop ring 140 extending upward into the lower chamber 312 is provided at the top of the valve body 100. Specifically, the stop ring 140 is provided at the top of the pressure relief valve body 102. (Refer to...) Figure 1 As shown, the stop ring 140 is cylindrical and its axis is vertical. The center of the stop ring 140 is through, and it has a central channel connecting the lower chamber 312 and the liquid outlet chamber 122. An annular plate 150 extending towards the center is provided at the bottom of the central channel. The control rod 200 passes through the central channel and is sealed to the annular plate 150.

[0062] Reference Figure 8 As shown, the annular plate 150 is located at the bottom of the central channel, and the annular plate 150 is sealed to the outer peripheral wall of the control rod 200. When the control rod 200 moves up and down relative to the annular plate 150, the control rod 200 and the annular plate 150 are always sealed, so that the medium in the liquid outlet chamber 122 will not enter the lower chamber 312.

[0063] Reference Figure 8As shown, in some embodiments of the present invention, the top of the control rod 200 is provided with a radially protruding buffer step 220. The buffer step 220 can be embedded in the central channel and sealed to the inner wall of the central channel to form a buffer cavity 141 between the bottom of the buffer step 220 and the top of the annular plate 150. The buffer cavity 141 communicates with the inlet end 111 of the main channel 110 to reduce the descent speed of the control rod 200. Specifically, the buffer step 220 is located at the top of the control rod 200, and the outer diameter of the buffer step 220 is larger than the diameter of other positions of the control rod 200. The inner diameter of the central channel is not smaller than the diameter of the buffer step 220. When the buffer step 220 enters the central channel, the outer peripheral wall of the buffer step 220 will be in sealed contact with the inner wall of the central channel, so that the bottom of the annular plate 150, the bottom of the buffer step 220, and the outer peripheral wall of the control rod 200 and the inner wall of the central channel form a buffer cavity 141.

[0064] As mentioned above, the lower chamber 312 is connected to the inlet end 111 of the main channel 110 via the second connecting pipe 340. However, it should be noted that, referring to... Figures 1 to 7 One end of the second connecting pipe is connected to the inlet end 111 of the main channel 110, while the other end is equipped with two branch pipes, namely a buffer pipe 341 and a quick-closing pipe 342. The buffer pipe 341 is connected to the buffer chamber 141, and the quick-closing pipe 342 is connected to the lower chamber 312 on the outer periphery of the annular plate 150. The diameter of the buffer pipe 341 should be smaller than the diameter of the quick-closing pipe 342, so that the buffer chamber 141 cannot be depressurized quickly, thereby greatly limiting the descent speed of the control rod 200 when it descends.

[0065] The working process of the pipeline self-regulating pump control valve in this embodiment of the invention is as follows:

[0066] 1. Reference Figure 1 As shown, Figure 1 The pipeline self-operated pump control valve is in the initial state, that is, before the pump starts to supply the medium into the pipeline, the main valve plate 130 is in the fully closed position; at this time, the bottom of the control lever 200 abuts against the protrusion 133, and the auxiliary valve plate 210 falls on the lower valve seat 125.

[0067] 2. Reference Figure 2 As shown, the pump has started at this time, and water is being supplied to the inlet end 111 of the main channel 110. The medium pressure in the inlet end 111 will push the main valve plate 130 from... Figure 2 The fully closed position gradually moves to the fully open position, and some medium in the second connecting pipe 340 has entered the lower chamber 312;

[0068] 3. Reference Figure 3As shown, the main valve plate 130 has moved from the fully closed position to the half-open position, which in turn drives the control lever 200 to move upward gradually. Some medium also enters the lower chamber 312 through the second connecting pipe 340. Due to the lower pressure, some of the medium in the upper chamber 311 is discharged through the first connecting pipe 330 to the outlet end 112 of the main channel 110, causing the lifting structure 320 to move upward gradually as well. Since the first connecting pipe 330 is equipped with a valve to control its discharge flow rate, the discharge speed of the medium in the upper chamber 311 is reliably controlled, thus enabling the main valve plate 130 to open slowly. The opening time is adjustable, which can prevent motor overload during startup and achieve smooth pump startup. Furthermore, the inlet chamber 121, volume chamber 123, and outlet chamber 122 are connected at this time, so they can be opened simultaneously for external pressure relief, preventing a sudden pressure increase at the outlet end 112 and subsequent water hammer damage.

[0069] 4. Reference Figure 4 As shown, at this time, the main valve plate 130 is in the fully open position, and the unit flow rate in the main channel 110 reaches the maximum. At this time, the auxiliary valve plate 210 abuts against the upper valve seat 124, the lifting structure 320 rises to the highest position, the medium in the upper chamber 311 is almost completely emptied, and the medium in the lower chamber 312 reaches its capacity.

[0070] 5. Reference Figure 5 As shown, when the pump stops, the flow rate at the inlet 111 of the main channel 110 drops sharply to zero. The main valve plate 130 loses the lifting force of the medium and thus closes rapidly under the action of eccentric gravity, completely cutting off the backflow medium and preventing the pump from reversing. At this time, since the outlet 112 of the main channel 110 still has back pressure, the second connecting pipe 340 will supply medium into the upper chamber 311, pushing the lifting structure 320 down and driving the control rod 200 down. At the same time, the auxiliary valve plate... Under its own weight and the thrust of the return water, 210 will also fall quickly, causing the auxiliary valve plate 210 to separate from the upper valve seat 124, connecting the inlet chamber 121, the volume chamber 123 and the outlet chamber 122, so that the pressure medium flowing back in the outlet end 112 of the main channel 110 can be quickly released from the outlet of the outlet chamber 122, avoiding abnormal pressure rise at the outlet end 112 of the main channel 110, that is, reducing the pump stop water hammer at the outlet end 112 of the main channel 110, and protecting the safety of the pipeline system;

[0071] 6. Reference Figure 6As shown, the control lever 200 has not yet fully descended to its lowest position, but the buffer shaft step 220 of the control lever 200 has partially entered the central channel, thus forming the buffer chamber 141. It is conceivable that before the buffer shaft step 220 enters the central channel, the medium in the lower chamber 312 is mainly discharged through the quick-closing pipe 342, resulting in a relatively fast descent speed of the control lever 200. However, as mentioned above, the buffer chamber 141 cannot be quickly depressurized through the buffer pipe 341. Therefore, once the buffer shaft step 220 partially enters the central channel, the descent speed of the control lever 200 will significantly decrease, thereby meeting the system's requirement for adjustable water hammer reduction time. Furthermore, the final closing time of the control lever 200 can be controlled by the opening degree of the buffer pipe 341.

[0072] 7. After the control lever 200 has fully descended to its bottom and abuts against the protrusion 133, the pipeline self-regulating pump control valve of this embodiment of the invention returns to its original position. Figure 1 state.

[0073] According to an embodiment of the present invention, the pipeline self-regulating pump control valve, by setting a main valve body 101 and a pressure relief valve body 102, with the main channel 110 of the main valve body 101 connected to the pressure relief channel 120 of the pressure relief valve body 102, can automatically release pressure through the pressure relief channel 120 during pump start-up and pump stop, thereby reducing water hammer generated during pump start-up and pump stop, and eliminating the risk of pump reversal when the pump stops; the pressure relief channel 120 has fewer structural components and the internal structure of the valve body 100 is simple, which can effectively improve service life and reduce production costs; the control component 300 is located outside the valve body 100, which facilitates online inspection and maintenance.

[0074] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A pipe self force pump control valve characterized by, The utility model relates to a valve body (100) with a main channel (110) for liquid flow and a pressure relief channel (120) in communication with the main channel (110), the main channel (110) is provided with a main valve plate (130) for controlling the opening and closing of the main channel (110); a control rod (200) passes through the pressure relief channel (120) and enters the main channel (110) at the bottom end; the control rod (200) is provided with a control assembly (300) at the top for driving the lifting of the control rod (200) and a secondary valve plate (210) in the middle; wherein the main valve plate (130) has a full-closed position and a full-open position, the main valve plate (130) can drive the control rod (200) to rise when moving from the full-closed position to the full-open position; the secondary valve plate (210) can cut off the communication between the main channel (110) and the pressure relief channel (120) when the main valve plate (130) is located at the full-open position or the full-closed position; wherein the pressure relief channel (120) comprises: a liquid inlet chamber (121) provided with a liquid inlet in communication with the main channel (110); a liquid outlet chamber (122) provided with a liquid outlet; a volume chamber (123) arranged between the liquid inlet chamber (121) and the liquid outlet chamber (122) to communicate the liquid inlet chamber (121) and the liquid outlet chamber (122), and the secondary valve plate (210) is movable in the volume chamber (123); the volume chamber (123) is provided with a lower valve seat (125) at the connection with the liquid inlet chamber (121) and an upper valve seat (124) at the connection with the liquid outlet chamber (122), the secondary valve plate (210) abuts against the lower valve seat (125) to cut off the communication between the volume chamber (123) and the liquid inlet chamber (121) when the main valve plate (130) is located at the full-closed position, and the secondary valve plate (210) abuts against the upper valve seat (124) to cut off the communication between the volume chamber (123) and the liquid outlet chamber (122) when the main valve plate (130) is located at the full-open position. The control assembly (300) comprises: a cavity container (310) provided with an inner cavity; a lifting structure (320) movably installed in the inner cavity; and a top end of the control rod (200) connected with the lifting structure (320). The lifting structure (320) divides the inner cavity into an upper cavity (311) and a lower cavity (312), the main channel (110) has an inlet end (111) and an outlet end (112), the lower cavity (312) is in communication with the inlet end (111) of the main channel (110), and the upper cavity (311) is in communication with the outlet end (112) of the main channel (110). The main valve plate (130) has a water-facing surface (131) and a water-backing surface (132), the water-facing surface (131) faces the inlet end (111), the water-backing surface (132) is provided with a protrusion (133) protruding from the surface, and the bottom of the control rod (200) abuts against the protrusion (133) when the main valve plate (130) is located at the full-closed position. ​ ​ ​ ​ ​ 2. A valve for a self-contained pump according to claim 1, wherein ​ ​ ​ 3. A valve for a self-contained pump according to claim 2, wherein: ​ 4. A valve for a self-contained pump according to claim 3, wherein: ​ 5. A valve for a self-contained pump according to claim 3, wherein: The valve body (100) is provided with a stop ring (140) extending upwardly into the lower chamber (312), and the center of the stop ring (140) is provided with a central passage communicating the lower chamber (312) and the liquid outlet chamber (122).

6. A valve for a self-contained pump according to claim 5, wherein: The bottom of the central passage is provided with an annular plate (150) extending toward the center, and the control rod (200) is arranged in the central passage and is in sealing connection with the annular plate (150).

7. A valve for a self-contained pump according to claim 6, wherein: The top of the control rod (200) is provided with a radially protruding buffer shaft step (220), which can be embedded in the central passage and is in sealing connection with the inner side wall of the central passage, so as to form a buffer cavity (141) between the bottom of the buffer shaft step (220) and the top of the annular plate (150); the buffer cavity (141) is in communication with the inlet end (111) of the main passage (110) and is used for slowing down the descending speed of the control rod (200).

8. A valve for a self-powered pump according to claim 1, wherein: The main valve plate (130) is in an inclined state when being in the fully closed position.

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