Pressure holding and releasing valve with damping function

Abstract

The utility model relates to the technical field of valves, in particular to a pressure holding and releasing valve with a shock absorption function, which comprises a valve body, a valve cover, a pressure releasing guide valve, a valve rod, a main valve clack, a reset spring and a buffer mechanism, and adopts a mode of buffering rebound of the valve rod to effectively relieve impact force of the main valve clack on the valve body, reduce vibration frequency of the valve and peripheral pipelines and improve safety of the valve. The service life of the valve and the pipeline is prolonged, the sealing performance of the valve body is guaranteed, and the technical problem that the service life of the pressure maintaining and releasing valve and the peripheral pipeline is easily affected by vibration generated by frequent opening and closing conversion of the valve in the prior art is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically to a pressure-holding and pressure-relieving valve with a shock-absorbing function. Background Art

[0002] Pressure relief valves are mainly used in fire protection or other water supply systems to prevent system overpressure or maintain the pressure of fire protection water supply systems. Pressure relief valves are also a type of safety valve, used in situations where the pressure is too high. The main working principle is to use the force of water to control the pilot valve, which is a type of automatic valve. When the pressure in the water supply pipe exceeds the set pressure, the pressure relief valve automatically opens to release the pressure, which can maintain the pressure of the water supply pipeline below the set safety value, preventing the pipeline and equipment from being damaged due to overpressure.

[0003] For example, the prior art discloses a control valve that integrates filtration, pressure relief and pressure holding, including a valve body, a valve stem, a valve plate, a valve cover installed on the upper part of the valve body and sealing the valve body, and a bottom pressure cover fixed to the bottom of the valve body and sealing the valve body; the bottom pressure cover, the valve body and the valve cover together form a valve chamber; the valve stem is built into the valve body, one side of the valve plate is fixedly connected to one end of the valve stem, and the other side of the valve plate is connected to the valve cover through an elastic element, and the elastic element has a pre-compression force; the valve stem and the valve plate together divide the valve chamber into a filter chamber, a pressure relief chamber and a control chamber; the filter chamber is provided with a water inlet, and the pressure relief chamber is provided with a pressure relief port; it also includes a pressure relief pilot valve, the pressure relief pilot valve is provided with a pressure relief pilot valve C port, a pressure relief pilot valve A port and a pressure relief pilot valve B port; the pressure relief pilot valve C port is connected to the control chamber, the pressure relief pilot valve A port is connected to the pressure relief chamber, and the pressure relief pilot valve B port is connected to the filtration chamber. The pressure relief pilot valve of this scheme is connected with the filter chamber, the pressure relief chamber and the control chamber respectively. When the pressure adjusting bolt on the pressure relief pilot valve is adjusted to a fixed value, the control valve is opened and the pressure in the filter chamber increases. When the pressure in the filter chamber is greater than the pressure displayed on the water pressure gauge, the water pressure in the filter chamber will cause the pressure relief pilot valve plate to open automatically and water will be discharged from the pressure relief chamber; when the pressure in the filter chamber is less than the pressure displayed on the water pressure gauge, the water pressure in the control chamber will cause the pressure relief pilot valve plate to close automatically; the automatic opening and closing of the pressure relief pilot valve can effectively protect the safety of the pipeline and ensure the water supply pressure upstream of the control valve.

[0004] However, in some water supply systems, since there is no pressure reducing valve in front of the pipeline network, or the pressure reducing valve function is abnormal, the water pressure in the pipeline is unstable, and there are many water supply branches in front of the pressure-holding and pressure relief valve. The water use time of each branch is irregular, and water is used at the same time or part of the branches are used while the other branches are closed. When the control valve of the prior art is used, the pressure in the filter chamber is close to the set value of the valve holding pressure, and the valve will frequently vibrate during pressure-holding and pressure-relief conversion, which makes the pipeline connection bolts around the pressure-holding and pressure relief valve easy to loosen and the sealing cannot be maintained. Over time, water seepage will occur in the surrounding sealing parts, so that after the valve reaches the set value, the main valve does not discharge water, resulting in the valve opening and closing action being insensitive and the use pressure being inaccurate, which has a certain impact on the upstream pipeline system. There is a technical problem that the vibration caused by the frequent opening and closing of the valve is easy to affect the life of the pressure-holding and pressure relief valve and the surrounding pipelines. Utility Model Content

[0005] The utility model aims to overcome the disadvantage in the prior art that the vibration generated by the frequent opening and closing of the valve easily affects the life of the pressure-sustained pressure relief valve and the surrounding pipelines, and provides a pressure-sustained pressure relief valve with a shock-absorbing function.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A pressure-holding and pressure-relief valve with a shock-absorbing function comprises a valve body, a valve cover arranged on the valve body, a pressure-relief pilot valve arranged on the valve cover and used for adjusting and stabilizing the pressure in the valve body, and a valve stem movably arranged between the valve cover and the valve body, wherein a water inlet chamber and a water outlet chamber which are interconnected through a pressure relief port are arranged in the valve body, a main valve flap which can be closed on the pressure relief port is arranged in the middle of the valve stem; a return spring which is used for keeping the main valve flap closing the pressure relief port is arranged between the valve stem and the valve cover; a buffer mechanism with elasticity is arranged at the bottom of the valve body, and the bottom end of the valve stem can abut against the buffer mechanism.

[0008] The utility model discloses a pressure-sustained pressure relief valve with a shock-absorbing function, since a return spring for keeping the main valve disc closing the pressure relief port is arranged between the valve stem and the valve cover, when the main valve disc opens the pressure relief port and the overpressure medium is released from the water inlet chamber through the pressure relief port and the water outlet chamber, the valve stem will restore the state of closing the pressure relief port under the action of the return spring, and in the process that the main valve disc descends along with the valve stem, a buffer valve stem rebound method is adopted to effectively alleviate the impact force of the main valve disc on the valve body, reduce the frequency of vibration of the valve and the surrounding pipelines, improve the service life of the valve and the pipeline, ensure the sealing performance of the valve body and the surrounding pipelines, and effectively solve the technical problem in the prior art that the vibration caused by the frequent opening and closing of the valve easily affects the service life of the pressure-sustained pressure relief valve and the surrounding pipelines.

[0009] Furthermore, a buffer hole communicating with the water inlet cavity is provided at the bottom of the valve body, and the buffer mechanism comprises a nut threadedly connected to the bottom of the buffer hole, a buffer spring disposed on the upper end surface of the nut, and a buffer pad disposed above the buffer spring, the buffer spring and the buffer pad are both disposed in the buffer hole, a limit platform is provided around the inner wall of the upper end of the buffer hole, and the upper end surface of the buffer pad abuts against the limit platform. The buffer pad can provide flexible contact for the valve stem, and the buffer spring provides buffering force, thereby providing delicate buffering for the valve stem.

[0010] Furthermore, an O-type sealing ring is provided between the nut and the buffer hole, and the O-type sealing ring is used to increase the sealing performance between the nut and the buffer hole.

[0011] Furthermore, the valve stem is provided with a valve plate above the main valve disc, a control cavity is formed between the valve plate and the valve cover, and the return spring is arranged between the valve plate and the valve cover. A control cavity is formed between the valve plate and the valve cover, and the return spring is arranged in the control cavity between the valve plate and the valve cover to provide stable support for the return spring.

[0012] Furthermore, the valve plate includes an upper diaphragm pressure plate, a lower diaphragm pressure plate, and a main valve diaphragm disposed between the upper diaphragm pressure plate and the lower diaphragm pressure plate, the lower end of the reset spring abuts against the upper end surface of the upper diaphragm pressure plate, the main valve diaphragm is fixedly connected between the valve cover and the valve body, and the main valve diaphragm can be deformed as the valve stem swings up and down. The main valve diaphragm is disposed between the upper diaphragm pressure plate and the lower diaphragm pressure plate to protect the main valve diaphragm, the lower end of the reset spring abuts against the upper end surface of the upper diaphragm pressure plate to provide stable support for the reset spring, the main valve diaphragm is fixedly connected between the valve cover and the valve body to ensure the stability of the sealing in the control chamber, and the main valve diaphragm can be deformed as the valve stem swings up and down to avoid affecting the axial movement of the valve stem.

[0013] Further, the pressure relief pilot valve comprises a pressure relief base disposed above the valve cover, the pressure relief base is provided with a water port A, a water port B and a water port C, the water port A is connected to the water inlet chamber, the water port B is connected to the control chamber, the water port C is connected to the water outlet chamber, and the control chamber is connected to the water inlet chamber. The water port A is connected to the water inlet chamber, the water port B is connected to the control chamber, the water port C is connected to the water outlet chamber, and the control chamber is connected to the water inlet chamber, so that the pressure relief pilot valve can monitor the pressure of the water inlet chamber, and realize the pressure of the pipeline before the valve is maintained by holding pressure or releasing pressure.

[0014] Furthermore, the pressure relief pilot valve also includes a pressure relief sleeve arranged above the pressure relief base, a pilot valve core movably arranged between the pressure relief sleeve and the pressure relief base, and a pilot valve diaphragm arranged on the top of the pilot valve core, a cavity is formed between the pilot valve diaphragm and the pressure relief sleeve; the lower end surface of the pilot valve diaphragm is connected to the water passage A port; the lower end surface of the pilot valve core is connected to the water passage B port, a pressure relief spring for keeping the pilot valve core closed at the water passage B port is arranged in the cavity, and the rising of the pilot valve core can connect the water passage B port with the water passage C port. Since a cavity is formed between the pilot valve diaphragm and the pressure relief sleeve, the pressure relief spring is arranged in the cavity to ensure that the pressure relief spring applies a stable force to the pilot valve core; since the lower end surface of the pilot valve diaphragm is connected with the water through port A, the pressure in the water inlet cavity can act on the lower end surface of the pilot valve diaphragm through the water through port A; since the lower end surface of the pilot valve core is connected with the water through port B, the pressure in the control cavity can act on the lower end surface of the pilot valve core through the water through port B, the pressure relief spring keeps the pilot valve core closed at the water through port B and keeps it in a pressure holding state, and the pilot valve core is arranged to rise so that the water through port B and the water through port C can be connected, thereby completing the pressure relief process and realizing the pressure relief and pressure holding function of the pressure relief pilot valve.

[0015] Furthermore, the top of the pressure relief sleeve is threadedly connected with an adjusting bolt, and the bottom end of the adjusting bolt is provided with a conical pressure piece, and the conical pressure piece abuts against the upper end of the pressure relief spring. The compression degree of the pressure relief spring is adjusted by the adjusting bolt, thereby adjusting the holding pressure value; the conical pressure piece abuts against the upper end of the pressure relief spring to maintain stable contact with the pressure relief spring, thereby ensuring that the adjusting bolt applies a stable force to the pressure relief spring.

[0016] Furthermore, a diaphragm pressing block is provided between the pressure relief spring and the pilot valve diaphragm, the pilot valve core is provided with a threaded column passing through the pilot valve diaphragm, the diaphragm pressing block is threadedly connected to the threaded column, and the threaded column is also threadedly connected to a locking nut provided on the top of the diaphragm pressing block. The diaphragm pressing block is provided between the pressure relief spring and the pilot valve diaphragm to protect the pilot valve diaphragm, so that the pressure relief spring can apply a stable force to the pilot valve diaphragm through the diaphragm pressing block; the diaphragm pressing block is threadedly connected to the threaded column of the pilot valve core, and is locked with a locking nut, so that the connection between the diaphragm pressing block, the pilot valve diaphragm and the pilot valve core is more stable.

[0017] Furthermore, the water port A is connected to the water inlet cavity through a copper tube, and a pressure gauge is connected to the side wall of the water port A. The pressure gauge is arranged on the water port A, so that the technicians can intuitively read the water inlet cavity pressure.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model discloses a pressure-sustained pressure relief valve with a shock-absorbing function, which adopts a buffer valve stem rebound method to effectively alleviate the impact force of the main valve disc on the valve body, reduce the frequency of vibration of the valve and surrounding pipelines, increase the life of the valve and pipelines, ensure the sealing of the valve body, and effectively solve the technical problem in the prior art that the vibration generated by the frequent opening and closing of the valve easily affects the life of the pressure-sustained pressure relief valve and the surrounding pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of a pressure-sustaining and pressure-relief valve with a shock-absorbing function;

[0021] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0022] Figure 3 It is a structural schematic diagram of a pressure-holding and pressure-relief valve with a shock-absorbing function;

[0023] Figure 4 It is a structural schematic diagram of the pressure relief pilot valve.

[0024] In the attached figure: 1, valve body; 11, pressure relief port; 12, water inlet chamber; 13, water outlet chamber; 14, buffer hole; 15, limit table; 2, valve cover; 3, pressure relief pilot valve; 31, pressure relief base; 311, water port A; 312, water port B; 313, water port C; 32, pressure relief sleeve; 33, pilot valve core; 331, threaded column; 332, locking nut; 34, pilot valve diaphragm; 35, cavity ; 36. Pressure relief spring; 37. Adjusting bolt; 38. Conical pressure piece; 39. Diaphragm pressure block; 4. Valve stem; 41. Main valve disc; 5. Reset spring; 6. Buffer mechanism; 61. Nut; 62. Buffer spring; 63. Buffer pad; 64. O-ring; 7. Valve plate; 71. Diaphragm upper pressure plate; 72. Diaphragm lower pressure plate; 73. Main valve diaphragm; 8. Control chamber; 9. Copper tube; 10. Pressure gauge. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with specific implementation methods. The drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] Embodiment 1

[0028] like Figure 1 to Figure 2 The figure shows a first embodiment of a pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to the utility model.

[0029] A pressure-holding and pressure-relief valve with a shock-absorbing function comprises a valve body 1, a valve cover 2 arranged on the valve body 1, a pressure-relief pilot valve 3 arranged on the valve cover 2 and used for adjusting and stabilizing the pressure in the valve body 1, and a valve stem 4 movably arranged between the valve cover 2 and the valve body 1. A water inlet chamber 12 and a water outlet chamber 13 which are interconnected through a pressure relief port 11 are arranged in the valve body 1. A main valve flap 41 which can be closed on the pressure relief port 11 is arranged in the middle of the valve stem 4. A return spring 5 for keeping the main valve flap 41 closing the pressure relief port 11 is arranged between the valve stem 4 and the valve cover 2. A buffer mechanism 6 with elasticity is arranged at the bottom of the valve body 1, and the bottom end of the valve stem 4 can abut against the buffer mechanism 6. The bottom of the valve body 1 is provided with a buffer hole 14 connected to the water inlet chamber 12. The buffer mechanism 6 includes a nut 61 threadedly connected to the bottom of the buffer hole 14, a buffer spring 62 disposed on the upper end surface of the nut 61, and a buffer pad 63 disposed above the buffer spring 62. The buffer spring 62 and the buffer pad 63 are both disposed in the buffer hole 14. The upper inner wall of the buffer hole 14 is provided with a limit platform 15. The upper end surface of the buffer pad 63 abuts against the limit platform 15. An O-ring 64 is provided between the nut 61 and the buffer hole 14.

[0030] In this embodiment, if Figure 1As shown, since a reset spring 5 is provided between the valve stem 4 and the valve cover 2 to keep the main valve flap 41 closing the pressure relief port 11, when the main valve flap 41 opens the pressure relief port 11 and the overpressure medium is released from the water inlet chamber 12 through the pressure relief port 11 and the water outlet chamber 13, the valve stem 4 will restore the closed pressure relief port 11 under the action of the reset spring 5. In the process of the main valve flap 41 descending along with the valve stem 4, a buffering valve stem 4 rebounds to effectively alleviate the impact force of the main valve flap 41 on the valve body 1, reduce the frequency of vibration of the valve and surrounding pipelines, improve the service life of the valve and pipelines, ensure the sealing of the valve body 1 and the surrounding pipelines, and effectively solve the technical problem in the prior art that the vibration generated by the frequent opening and closing of the valve easily affects the service life of the pressure-holding pressure relief valve and the surrounding pipelines.

[0031] In this embodiment, if Figure 2 As shown, the buffer pad 63 can provide flexible contact for the valve stem 4 , and the buffer spring 62 provides a buffer force, providing a delicate buffer for the valve stem 4 ; the limit platform 15 plays the role of the limit buffer pad 63 .

[0032] In this embodiment, if Figure 2 As shown, an O-ring 64 is used to increase the sealing between the nut 61 and the buffer hole 14 .

[0033] Embodiment 2

[0034] like Figure 1 and Figure 3 The figure shows a second embodiment of a pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to the present utility model.

[0035] This embodiment is similar to the first embodiment, except that: the valve stem 4 is provided with a valve plate 7 above the main valve disc 41, a control chamber 8 is formed between the valve plate 7 and the valve cover 2, and a reset spring 5 is provided between the valve plate 7 and the valve cover 2. The valve plate 7 includes a diaphragm upper pressure plate 71, a diaphragm lower pressure plate 72, and a main valve diaphragm 73 provided between the diaphragm upper pressure plate 71 and the diaphragm lower pressure plate 72, the lower end of the reset spring 5 abuts against the upper end surface of the diaphragm upper pressure plate 71, the main valve diaphragm 73 is fixedly connected between the valve cover 2 and the valve body 1, and the main valve diaphragm 73 can be deformed as the valve stem 4 swings up and down. The pressure relief pilot valve 3 includes a pressure relief base 31 disposed above the valve cover 2, and the pressure relief base 31 is provided with a water port A 311, a water port B 312, and a water port C 313. The water port A 311 is connected to the water inlet chamber 12, the water port B 312 is connected to the control chamber 8, the water port C 313 is connected to the water outlet chamber 13, and the control chamber 8 is connected to the water inlet chamber 12. The water port A 311 is connected to the water inlet chamber 12 through a copper tube 9, and a pressure gauge 10 is connected to the side wall of the water port A 311.

[0036] In this embodiment, if Figure 1As shown, a control chamber 8 is formed between the valve plate 7 and the valve cover 2 , and a return spring 5 is arranged in the control chamber 8 between the valve plate 7 and the valve cover 2 to provide stable support for the return spring 5 .

[0037] In this embodiment, if Figure 1 As shown, the main valve diaphragm 73 is arranged between the diaphragm upper pressure plate 71 and the diaphragm lower pressure plate 72 to protect the main valve diaphragm 73, and the lower end of the reset spring 5 is abutted against the upper end surface of the diaphragm upper pressure plate 71 to provide stable support for the reset spring 5, and the main valve diaphragm 73 is fixedly connected between the valve cover 2 and the valve body 1 to ensure the stability of the sealing in the control chamber 8, and the main valve diaphragm 73 can be deformed with the up and down swing of the valve stem 4 to avoid affecting the axial movement of the valve stem 4.

[0038] In this embodiment, if Figure 1 As shown, the water passage A port 311 is connected to the water inlet chamber 12, the water passage B port 312 is connected to the control chamber 8, the water passage C port 313 is connected to the water outlet chamber 13, and the control chamber 8 is connected to the water inlet chamber 12, so that the pressure relief pilot valve 3 can monitor the pressure of the water inlet chamber 12, and maintain the pressure of the valve pipeline by maintaining pressure or releasing pressure.

[0039] In this embodiment, if Figure 1 and Figure 3 As shown, a pressure gauge 10 is provided on the water communication port A 311 to facilitate technicians to intuitively read the pressure of the water inlet chamber 12 .

[0040] Embodiment 3

[0041] like Figure 4 The third embodiment of the pressure-sustaining and pressure-relieving valve with a shock-absorbing function of the utility model is shown.

[0042] This embodiment is similar to the first embodiment or the second embodiment, except that: the pressure relief pilot valve 3 further includes a pressure relief sleeve 32 disposed above the pressure relief base 31, a pilot valve core 33 movably disposed between the pressure relief sleeve 32 and the pressure relief base 31, and a pilot valve diaphragm 34 disposed on the top of the pilot valve core 33, a cavity 35 is formed between the pilot valve diaphragm 34 and the pressure relief sleeve 32; the lower end surface of the pilot valve diaphragm 34 is connected to the water flow A port 311; the lower end surface of the pilot valve core 33 is connected to the water flow B port 312, and a pressure relief spring 36 is provided in the cavity 35 for keeping the pilot valve core 33 closed to the water flow B port 312, and the pilot valve core 33 rises to connect the water flow B port 312 with the water flow C port 313. Among them, an adjusting bolt 37 is threadedly connected to the top of the pressure relief sleeve 32, and a conical pressing plate 38 is provided at the bottom end of the adjusting bolt 37, and the conical pressing plate 38 abuts against the upper end of the pressure relief spring 36. Among them, a diaphragm pressing block 39 is provided between the pressure relief spring 36 and the pilot valve diaphragm 34, the pilot valve spool 33 is provided with a threaded column 331 passing through the pilot valve diaphragm 34, the diaphragm pressing block 39 is threadedly connected to the threaded column 331, and the threaded column 331 is also threadedly connected to a locking nut 332 arranged on the top of the diaphragm pressing block 39.

[0043] In this embodiment, if Figure 4 As shown, since a cavity 35 is formed between the pilot valve diaphragm 34 and the pressure relief sleeve 32, the pressure relief spring 36 is arranged in the cavity 35 to ensure that the pressure relief spring 36 applies a stable force to the pilot valve core 33; since the lower end surface of the pilot valve diaphragm 34 is connected with the water flow A port 311, the pressure in the water inlet chamber 12 can act on the lower end surface of the pilot valve diaphragm 34 through the water flow A port 311; since the lower end surface of the pilot valve core 33 is connected with the water flow B port 312, the pressure in the control chamber 8 can act on the lower end surface of the pilot valve core 33 through the water flow B port 312, and the pressure relief spring 36 keeps the pilot valve core 33 closed and kept in a pressure holding state, and the pilot valve core 33 is set to rise so that the water flow B port 312 and the water flow C port 313 are connected, thereby completing the pressure relief process and realizing the pressure relief and pressure holding function of the pressure relief pilot valve 3.

[0044] In this embodiment, if Figure 4 As shown, the compression degree of the pressure relief spring 36 is adjusted by adjusting the adjusting bolt 37, thereby adjusting the holding pressure value; the conical pressure piece 38 is abutted against the upper end of the pressure relief spring 36 to maintain stable contact with the pressure relief spring 36, thereby ensuring that the adjusting bolt 37 applies a stable force to the pressure relief spring 36.

[0045] In this embodiment, if Figure 4As shown, the diaphragm pressing block 39 is arranged between the pressure relief spring 36 and the pilot valve diaphragm 34 to protect the pilot valve diaphragm 34, so that the pressure relief spring 36 can apply a stable force to the pilot valve diaphragm 34 through the diaphragm pressing block 39; the diaphragm pressing block 39 is threadedly connected to the threaded column 331 of the pilot valve core 33, and is locked with a locking nut 332 to make the connection between the diaphragm pressing block 39, the pilot valve diaphragm 34 and the pilot valve core 33 more stable.

[0046] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A pressure-sustained relief valve with a shock-absorbing function, characterized in that: The invention comprises a valve body (1), a valve cover (2) arranged on the valve body (1), a pressure relief pilot valve (3) arranged on the valve cover (2) and used for adjusting and stabilizing the pressure in the valve body (1), and a valve stem (4) movably arranged between the valve cover (2) and the valve body (1); a water inlet chamber (12) and a water outlet chamber (13) which are interconnected through a pressure relief port (11) are arranged in the valve body (1); a main valve flap (41) which can be closed on the pressure relief port (11) is arranged in the middle of the valve stem (4); a return spring (5) which is used for keeping the main valve flap (41) closing the pressure relief port (11) is arranged between the valve stem (4) and the valve cover (2); a buffer mechanism (6) with elasticity is arranged at the bottom of the valve body (1), and the bottom end of the valve stem (4) can abut against the buffer mechanism (6).

2. A pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to claim 1, characterized in that: The bottom of the valve body (1) is provided with a buffer hole (14) connected to the water inlet chamber (12); the buffer mechanism (6) comprises a nut (61) threadedly connected to the bottom of the buffer hole (14), a buffer spring (62) disposed on the upper end surface of the nut (61), and a buffer pad (63) disposed above the buffer spring (62); the buffer spring (62) and the buffer pad (63) are both disposed in the buffer hole (14); a limit platform (15) is provided around the inner wall of the upper end of the buffer hole (14); and the upper end surface of the buffer pad (63) abuts against the limit platform (15).

3. A pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to claim 2, characterized in that: An O-type sealing ring (64) is provided between the nut (61) and the buffer hole (14).

4. The pressure-sustained relief valve with a shock-absorbing function according to claim 1, characterized in that: The valve stem (4) is provided with a valve plate (7) above the main valve disc (41), a control chamber (8) is formed between the valve plate (7) and the valve cover (2), and the return spring (5) is provided between the valve plate (7) and the valve cover (2).

5. The pressure-sustained relief valve with a shock-absorbing function according to claim 4, characterized in that: The valve plate (7) comprises a diaphragm upper pressure plate (71), a diaphragm lower pressure plate (72) and a main valve diaphragm (73) arranged between the diaphragm upper pressure plate (71) and the diaphragm lower pressure plate (72); the lower end of the return spring (5) abuts against the upper end surface of the diaphragm upper pressure plate (71); the main valve diaphragm (73) is fixedly connected between the valve cover (2) and the valve body (1); and the main valve diaphragm (73) can be deformed as the valve stem (4) swings up and down.

6. The pressure-sustained relief valve with a shock-absorbing function according to claim 4, characterized in that: The pressure relief pilot valve (3) comprises a pressure relief base (31) arranged above the valve cover (2); the pressure relief base (31) is provided with a water passage A port (311), a water passage B port (312) and a water passage C port (313); the water passage A port (311) is connected to the water inlet chamber (12), the water passage B port (312) is connected to the control chamber (8), the water passage C port (313) is connected to the water outlet chamber (13), and the control chamber (8) is connected to the water inlet chamber (12).

7. The pressure-sustained relief valve with a shock-absorbing function according to claim 6, characterized in that: The pressure relief pilot valve (3) further comprises a pressure relief sleeve (32) arranged above the pressure relief base (31), a pilot valve core (33) movably arranged between the pressure relief sleeve (32) and the pressure relief base (31), and a pilot valve diaphragm (34) arranged on the top of the pilot valve core (33); a cavity (35) is formed between the pilot valve diaphragm (34) and the pressure relief sleeve (32); the lower end surface of the pilot valve diaphragm (34) is in communication with the water flow A port (311); the lower end surface of the pilot valve core (33) is in communication with the water flow B port (312); a pressure relief spring (36) is arranged in the cavity (35) for keeping the pilot valve core (33) closing the water flow B port (312); the pilot valve core (33) rises to allow the water flow B port (312) to communicate with the water flow C port (313).

8. The pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to claim 7, characterized in that: The top of the pressure relief sleeve (32) is threadedly connected with an adjusting bolt (37), and the bottom end of the adjusting bolt (37) is provided with a conical pressing piece (38), and the conical pressing piece (38) abuts against the upper end of the pressure relief spring (36).

9. The pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to claim 7, characterized in that: A diaphragm pressing block (39) is provided between the pressure relief spring (36) and the pilot valve diaphragm (34); the pilot valve core (33) is provided with a threaded column (331) passing through the pilot valve diaphragm (34); the diaphragm pressing block (39) is threadedly connected to the threaded column (331); and the threaded column (331) is also threadedly connected to a locking nut (332) provided on the top of the diaphragm pressing block (39).

10. The pressure-sustaining and pressure-relieving valve with a shock-absorbing function according to claim 6, characterized in that: The water passage A port (311) is in communication with the water inlet chamber (12) via a copper tube (9), and a pressure gauge (10) is connected to the side wall of the water passage A port (311).

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