A reflux safety valve with a storage tank

Abstract

When the valve body is in a state of being overloaded, the closure of the valve body being of high pressure and high pressure, and the like being pressed against the closure of the valve body and being pressed against the closure of the valve body, the closure of the valve body being of high pressure and being pressed against the closure of the valve body.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves, and in particular to a reflux safety valve with a storage tank. Background Art

[0002] A safety valve is an automatic valve that automatically discharges the medium outside the system when the medium pressure in the equipment or pipeline exceeds the specified value, thereby protecting the equipment and personal safety.

[0003] However, when the safety valve releases pressure, the medium discharged to the outside is difficult to collect, which not only causes material waste and economic losses, but also causes environmental pollution. Therefore, it is necessary to improve the existing safety valve so that it has the function of medium reflux after pressure relief.

[0004] In addition, the pressure relief frequency of the safety valve is generally low, that is, the sealing gasket seat (equivalent to the closing disk in this application) inside it will be in a static state for a long time, which can easily cause the sealing gasket seat to rust and get stuck. This situation will affect the pressure relief threshold set in the safety valve and affect the activation of the safety valve. However, it is usually difficult to perform a sticking test on the sealing gasket seat in existing safety valves, so improvement is needed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a reflux safety valve with a storage tank to solve the problem that the current safety valve easily causes material waste and its internal accessories are easily rusted and stuck, thereby affecting the pressure relief threshold.

[0006] The present invention provides the following technical solution: a reflux safety valve with a storage tank, comprising a valve body and a spring barrel fixed on the valve body, and also comprising a storage tank, wherein a valve cavity is provided in the valve body, a liquid inlet pipe is provided in the bottom surface of the valve cavity, and a flange is provided at the end of the liquid inlet pipe extending outside the valve body, a closing disk is slidably connected up and down in the valve cavity, the lower end of the closing disk abuts against the liquid inlet pipe to close it, and an adjusting mechanism for adjusting the pressure of the closing disk on the liquid inlet pipe is provided in the spring barrel;

[0007] A storage chamber is provided in the storage tank, and a vent hole is provided in the side of the storage chamber. The storage chamber is connected to the valve chamber through a No. 1 hose, and a return pipe is provided in the bottom surface of the valve chamber, and a No. 1 one-way valve for downward flow is provided in the return pipe.

[0008] Preferably, a vertically arranged hollow tube is provided on the bottom surface of the storage cavity, the hollow tube is connected to the first hose, and the upper end of the hollow tube is lower than the vent hole;

[0009] The storage chamber is also slidably connected to a liquid lifting plate, which is sleeved on the outside of the hollow tube, and a lifting shaft threadedly connected to the liquid lifting plate is rotatably connected to the storage chamber, and a motor for driving the lifting shaft is fixed on the upper side of the storage tank.

[0010] Preferably, a spring groove is provided in the spring barrel, the adjustment mechanism includes a spring plate slidably connected to the spring groove up and down, the closing disk is fixed to the lower side of the spring plate, an adjustment plate is also slidably connected to the spring groove up and down, the adjustment plate and the spring plate are connected by a spring, and an adjustment shaft threadedly connected to the adjustment plate is also rotatably connected to the upper side of the spring barrel.

[0011] Preferably, a control rod is fixedly disposed on the upper end of the spring plate, which passes through the adjustment plate and extends to the upper side of the spring barrel;

[0012] The upper end of the spring barrel is hinged with a pressure rod, the pressure rod is connected to the upper end of the control rod through a connecting piece, and the other end of the pressure rod is equipped with a handle.

[0013] Preferably, the connecting member includes a tension sensor and a connecting rope connected to the tension sensor, and an end of the connecting rope is mounted on the control rod.

[0014] Preferably, it further comprises a sampling mechanism, wherein the sampling mechanism comprises a shell, an airtight chamber is provided in the shell, a piston is slidably connected up and down in the airtight chamber, and a piston rod connected to the piston extends to the upper side of the shell;

[0015] The control rod comprises a rod body and an upper cover, wherein an installation groove is provided in the upper end surface of the rod body, the outer shell is fixed in the installation groove, and the piston rod is fixed in the upper cover, and further comprises a connecting sleeve, the connecting sleeve is threadedly connected to the outside of the rod body, and the outer curved surface of the upper cover is processed with a thread capable of connecting with the connecting sleeve;

[0016] A sampling tube passing through the liquid inlet pipe is fixedly provided on the end surface of the closing disk, a No. 1 through hole passing through the rod body, the spring plate and the closing disk and connected to the sampling tube is provided in the bottom surface of the airtight cavity, a No. 2 through hole connected to the No. 1 through hole is provided in the curved surface of the closing disk, and a No. 2 through hole is provided, and a sampling port passing outward is provided on the side surface of the valve cavity, and the sampling port is connected to the No. 2 through hole through a No. 2 hose, a No. 2 one-way valve flowing in the direction of the No. 2 hose is provided in the No. 2 through hole, and a No. 3 one-way valve flowing upward is provided in the No. 1 through hole, and the No. 3 one-way valve is located at the lower side of the No. 2 through hole.

[0017] Preferably, a step groove is provided in the upper side surface of the valve body, and a sliding sleeve is installed in the step groove, the closing plate is slidably connected in the sliding sleeve up and down, a vertical oil guide groove is provided in the control rod, and an oil inlet hole and an oil outlet hole connected to the oil guide groove are provided in the outer curved surface of the control rod, and the oil outlet hole is located on the lower side of the spring plate.

[0018] Preferably, the oil inlet hole is located at the lower side of the upper end surface of the spring barrel, and the distance between the oil inlet hole and the upper end surface of the spring barrel is smaller than the up and down stroke of the control rod.

[0019] Preferably, an oil retaining ring is provided on the upper end surface of the spring barrel, and the oil retaining ring surrounds the outside of the control rod.

[0020] Preferably, a plug is provided at the sampling port, and the plug is threadedly connected to the sampling port.

[0021] The present invention provides a reflux safety valve with a storage tank, which has the following beneficial effects:

[0022] The present invention is provided with a storage tank. When the pressure of the pipeline connected to the valve body of the present invention is too high and pressure relief is performed, the medium can be temporarily stored in the storage tank, and when the pipeline pressure is stable, the medium in the storage tank can flow back into the pipeline to avoid waste.

[0023] A pressure rod is provided on the valve body in the present invention, and the staff can control the pressure rod to perform a sticking test of the closing disk in the valve body and a sampling of the medium in the pipeline connected to the valve body, thereby improving the accuracy of the pressure relief pressure control of the present invention and increasing the scope of application of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure in the valve body of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure in the storage tank of the present invention;

[0026] Figure 3 yes Figure 1 The enlarged schematic diagram of point A in the middle;

[0027] Figure 4 yes Figure 1 An enlarged schematic diagram of the middle through hole No. 1;

[0028] Figure 5 It is a schematic diagram of the appearance of the present invention.

[0029] In the figure:

[0030] 11. Valve body; 12. Spring barrel; 13. Storage tank; 14. Valve cavity; 15. Liquid inlet pipe; 16. Closing disk; 17. Storage cavity; 18. No. 1 hose; 19. Return pipe; 20. Hollow tube; 21. Liquid lifting plate; 22. Lifting shaft; 23. Motor; 24. Spring groove; 25. Spring plate; 26. Adjusting plate; 27. Adjusting shaft; 28. Control rod; 29. ​​Pressure rod; 30. Tension sensor; 31. Connecting rope; 32. Shell; 33. Airtight cavity; 34. Piston; 35. Sampling tube; 36. No. 1 through hole; 37. No. 2 through hole; 38. No. 2 hose; 39. Sliding sleeve; 40. Oil inlet hole; 41. Oil outlet hole; 42. Oil retaining ring; 43. Plug; 91. Rod body; 92. Upper cover; 93. Connecting sleeve. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference Figure 1-Figure 5 According to an embodiment of the present invention, a reflux safety valve with a storage tank includes a valve body 11 and a spring barrel 12 fixed on the valve body 11, and also includes a storage tank 13. A valve cavity 14 is provided in the valve body 11, and a liquid inlet pipe 15 is provided in the bottom surface of the valve cavity 14, and a flange is provided at the end of the liquid inlet pipe 15 extending outside the valve body 11, and a closing disk 16 is slidably connected to the valve cavity 14 up and down, and the lower end of the closing disk 16 abuts against the liquid inlet pipe 15 to close it, and an adjusting mechanism for adjusting the pressure of the closing disk 16 on the liquid inlet pipe 15 is provided in the spring barrel 12.

[0036] A storage chamber 17 is provided in the storage tank 13, and a vent hole is provided in the side of the storage chamber 17. The storage chamber 17 is connected to the valve chamber 14 through a No. 1 hose 18, and a return pipe 19 is provided in the bottom surface of the valve chamber 14. A No. 1 one-way valve for downward flow is provided in the return pipe 19.

[0037] When the reflux safety valve with a storage tank is installed on a pipeline, the flange is fixed on the pipeline so that the pipeline is connected to the liquid inlet pipe 15, and the pipeline is connected to the reflux pipe 19. When the pressure in the pipeline is too high, the fluid in the pipeline will squeeze the closing disk 16 upward and flow into the valve cavity 14. Thereafter, the fluid in the valve cavity 14 will enter the storage cavity 17 through the No. 1 hose 18. At this time, the reflux safety valve with a storage tank is in a pressure relief state. The function of the air vent is to prevent a pressure difference between the storage cavity 17 and the outside of the storage tank 13 in this case, and to enable the liquid to be discharged through the air vent after the storage cavity 17 is filled with liquid, thereby avoiding failure of the safety valve.

[0038] When the pressure in the pipeline is stable, the closing disk 16 will continue to abut against the liquid inlet pipe 15 to close it, and at this time the fluid in the storage chamber 17 can enter the valve chamber 14 through the No. 1 hose 18 and flow back to the pipeline through the reflux pipe 19 to reduce material waste.

[0039] In the first embodiment of the above-mentioned storage chamber 17, the No. 1 hose 18 is connected to the lower side of the storage chamber 17, which causes pressure to be generated when the liquid level in the storage chamber 17 gradually rises, so as to indirectly increase the pressure required for the pressure relief of the reflowable safety valve with a storage tank. Therefore, in the second embodiment of the reflowable safety valve with a storage tank, a vertically arranged hollow tube 20 is provided in the bottom surface of the storage chamber 17, and the lower end of the hollow tube 20 is connected to the No. 1 hose 18, and the upper end of the hollow tube 20 is lower than the vent hole. Such an arrangement ensures that the pressure relief pressure is stable when the reflowable safety valve with a storage tank performs pressure relief work.

[0040] In addition, in this second embodiment, in order to allow the fluid in the storage chamber 17 to flow back, a liquid lifting plate 21 is slidably connected to the storage chamber 17, and the liquid lifting plate 21 is sleeved on the outside of the hollow tube 20. A lifting shaft 22 threadedly connected to the liquid lifting plate 21 is rotatably connected to the storage chamber 17. A motor 23 for driving the lifting shaft 22 is fixed on the upper side of the storage tank 13. Two lifting shafts 22 are provided and connected by a No. 1 synchronous belt. When the pressure in the pipeline is stable, the motor 23 is energized (controlled according to other equipment installed on the pipeline, such as a flow meter, etc.) and drives the lifting shaft 22 to rotate, so that the liquid lifting plate 21 rises slowly. During this process, the fluid in the storage chamber 17 can enter the hollow tube 20 through the upper end of the hollow tube 20, and flow back to the pipeline through the reflux pipe 19. During the actual installation process, it is also necessary to adjust the height of the storage tank 13 relative to the valve body 11 to enable smooth reflux.

[0041] A spring slot 24 is provided in the spring barrel 12, and the adjustment mechanism includes a spring plate 25 slidably connected to the spring slot 24 up and down, and the closing disk 16 is fixed to the lower side of the spring plate 25. An adjustment plate 26 is also slidably connected to the spring slot 24 up and down, and the adjustment plate 26 is connected to the spring plate 25 through a spring. An adjustment shaft 27 threadedly connected to the adjustment plate 26 is also rotatably connected to the upper side of the spring barrel 12. Two adjustment shafts 27 are provided and connected through a No. 2 synchronous belt. The staff can control the upper and lower positions of the adjustment plates 26 by rotating the adjustment shafts 27, thereby controlling the initial compression degree of the spring, and the compression degree of the spring controls the threshold value of the pressure in the pipeline required for the closing disk 16 to move upward to relieve pressure.

[0042] In order to facilitate the staff to feel the force required to lift the closing plate 16, a control rod 28 is fixedly provided on the upper end of the spring plate 25, which passes through the adjustment plate 26 and extends to the upper side of the spring barrel 12. In order to avoid interference between the second synchronous belt and the control rod 28, a sleeve 43 is rotatably connected to the upper side of the spring groove 24, and the second synchronous belt is attached to the outside of the sleeve 43 to avoid contact with the control rod 28.

[0043] A pressure rod 29 is hinged at the upper end of the spring barrel 12 . The pressure rod 29 is connected to the upper end of the control rod 28 through a connecting piece, and a handle is provided at the other end of the pressure rod 29 .

[0044] In order to digitize the force required to lift the closing plate 16 so as to test whether the closing plate 16 is rusted and stuck, the connecting piece includes a tension sensor 30 and a connecting rope 31 connected to the tension sensor 30. The tension sensor 30 is fixed in the pressure rod 29, and the end of the connecting rope 31 is installed on the control rod 30.

[0045] That is, the user can press down the right end of the pressure rod 29 to make the left end of the pressure rod 29 tilt up, and pull the control rod 28 and the closing plate 16 upward through the connecting rope 31. During this process, the staff can judge the pressure relief pressure of the reflowable safety valve with a storage tank based on the indication of the tension sensor 30.

[0046] The installation method of the closing disk 16 is as follows: a step groove is provided in the upper side surface of the valve body 11, and a sliding sleeve 39 is installed in the step groove. The closing disk 16 is slidably connected to the sliding sleeve 39 up and down. In order to avoid rust between the closing disk 16 and the sliding sleeve 39 to cause the closing disk 16 to get stuck, a vertical oil guide groove is provided in the control rod 28, and an oil inlet hole 40 and an oil outlet hole 41 connected to the oil guide groove are provided in the outer curved surface of the control rod 28. The oil outlet hole 41 is located at the lower side of the spring plate 25 and at the upper side of the sliding sleeve 39, and the oil inlet hole 40 is located at the lower side of the spring plate 25 and at the upper side of the sliding sleeve 39. 2, and the distance between the oil inlet hole 40 and the upper end surface of the spring barrel 12 is smaller than the up and down stroke of the control rod 28. When the control rod 28 is not lifted, the oil inlet hole 40 is in a closed state to avoid contamination. When the right end of the pressure rod 29 is pressed down to lift the control rod 28, the oil inlet hole 40 can be exposed. At this time, if the staff injects lubricating oil into it, the lubricating oil will pass through the oil guide groove and the oil outlet hole 41. The discharged lubricating oil will act between the closing disk 16 and the sliding sleeve 39 to avoid the closing disk 16 from getting stuck.

[0047] In order to facilitate the oil filling work, an oil retaining ring 42 is arranged on the upper end surface of the spring barrel 12, and the oil retaining ring 42 is wound around the outside of the control rod 28. With this arrangement, the staff only needs to pour the lubricating oil into the oil retaining ring 42, and then repeatedly press the pressure rod 29 down to lubricate the closing disk 16 and the sliding sleeve 39.

[0048] In the second embodiment of the spring barrel 12, a sampling mechanism is further included, the sampling mechanism includes a shell 32, an airtight chamber 33 is provided in the shell 32, and a piston 34 is slidably connected to the airtight chamber 33, and a piston rod connected to the piston 34 extends to the upper side of the shell 32;

[0049] The control rod 28 includes a rod body 91 and an upper cover 92. The upper end surface of the rod body 91 is provided with a mounting groove, and the housing 32 is fixed in the mounting groove, and the piston rod is fixed in the upper cover 92. It also includes a connecting sleeve 93, and the connecting sleeve 93 is threadedly connected to the outside of the rod body 91, and the outer curved surface of the upper cover 92 is processed with a thread that can connect the connecting sleeve 93, that is, when the connecting sleeve 93 is connected to the upper cover 92 and the rod body 91, when the pressure rod 29 is swung, it will only drive the closing disk 16 to move up and down to perform the pressure relief pressure test and the injection of lubricating oil. When the connecting sleeve 93 is only sleeved on the outside of the rod body 91, when the pressure rod 29 is swung, the piston 34 will move up and down periodically (when the left end of the pressure rod 29 moves downward, the piston 34 and the piston rod will move downward due to their own weight).

[0050] In addition, a sampling tube 35 that passes through the liquid inlet pipe 15 is fixedly provided on the end surface of the closing disk 16, a No. 1 through hole 36 that passes through the rod body 91, the spring plate 25 and the closing disk 16 and is connected to the sampling tube 35 is provided in the bottom surface of the airtight cavity 33, a No. 2 through hole 37 that is connected to the No. 1 through hole 36 is provided in the curved surface of the closing disk 16, a sampling port that passes outward is provided on the side of the valve cavity 14, and the sampling port is connected to the No. 2 through hole 37 through a No. 2 hose 38, a No. 2 one-way valve that flows in the direction of the No. 2 hose 38 is provided in the No. 2 through hole 37, and a No. 3 one-way valve that flows upward is provided in the No. 1 through hole 36, and the No. 3 one-way valve is located at the lower side of the No. 2 through hole 37.

[0051] When the piston 34 moves upward, the fluid in the pipeline will enter the No. 1 through hole 36 through the sampling tube 35 and flow to the No. 2 through hole 37 and the upper side of the No. 3 one-way valve. When the piston 34 moves downward, the fluid in the No. 1 through hole 36 will flow out through the No. 2 through hole 37 and the No. 2 hose 38 through the sampling port, making it convenient for staff to take samples.

[0052] In addition, a plug 43 is provided at the sampling port, and in order to prevent the plug 43 from being squeezed out when the pipeline is in a high-pressure state, the plug 43 is threadedly connected to the sampling port. When the staff is not sampling, they need to close the sampling port with the plug 43 to prevent the medium from flowing out through the sampling port when the pressure in the pipeline is too high.

[0053] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A reflux safety valve with a storage tank, comprising a valve body (11) and a spring barrel (12) fixed to the valve body (11), characterized in that: It also comprises a storage tank (13), wherein the valve body (11) is provided with a valve cavity (14), a liquid inlet pipe (15) is provided in the bottom surface of the valve cavity (14), and a flange is provided at the end of the liquid inlet pipe (15) extending outside the valve body (11), a closing disk (16) is slidably connected up and down in the valve cavity (14), the lower end of the closing disk (16) abuts against the liquid inlet pipe (15) to close it, and an adjusting mechanism for adjusting the pressure of the closing disk (16) on the liquid inlet pipe (15) is provided in the spring barrel (12); The storage tank (13) is provided with a storage chamber (17), a vent hole is also provided in the side of the storage chamber (17), the storage chamber (17) is connected to the valve chamber (14) through a No. 1 hose (18), and a return pipe (19) is provided in the bottom surface of the valve chamber (14), and a No. 1 check valve for downward flow is provided in the return pipe (19); A vertically arranged hollow tube (20) is provided on the bottom surface of the storage cavity (17), the hollow tube (20) is connected to the first hose (18), and the upper end of the hollow tube (20) is lower than the vent hole; The spring barrel (12) is provided with a spring slot (24), the adjustment mechanism comprises a spring plate (25) slidably connected to the spring slot (24) up and down, the closing disk (16) is fixed to the lower side of the spring plate (25), an adjustment plate (26) is slidably connected to the spring slot (24) up and down, the adjustment plate (26) and the spring plate (25) are connected via a spring, and an adjustment shaft (27) threadedly connected to the adjustment plate (26) is rotatably connected to the upper side of the spring barrel (12); A control rod (28) is also fixedly disposed at the upper end of the spring plate (25), which passes through the adjustment plate (26) and extends to the upper side of the spring barrel (12); A pressure rod (29) is hingedly connected to the upper end of the spring barrel (12), the pressure rod (29) is connected to the upper end of the control rod (28) through a connecting piece, and a handle is provided at the other end of the pressure rod (29); The connecting member comprises a tension sensor (30) and a connecting rope (31) connected to the tension sensor (30), wherein the end of the connecting rope (31) is mounted on the control rod (28); It also includes a sampling mechanism, the sampling mechanism including a housing (32), an airtight chamber (33) being provided in the housing (32), a piston (34) being slidably connected up and down in the airtight chamber (33), and a piston rod connected to the piston (34) extending to the upper side of the housing (32); The control rod (28) comprises a rod body (91) and an upper cover (92), wherein an installation groove is provided in the upper end surface of the rod body (91), the housing (32) is fixed in the installation groove, and the piston rod is fixed in the upper cover (92), and further comprises a connecting sleeve (93), the connecting sleeve (93) is threadedly connected to the outside of the rod body (91), and the outer curved surface of the upper cover (92) is processed with a thread capable of connecting to the connecting sleeve (93); A sampling tube (35) penetrating the liquid inlet tube (15) is fixedly arranged on the end surface of the closing disk (16); a No. 1 through hole (36) penetrating the rod body (91), the spring plate (25) and the closing disk (16) and connected to the sampling tube (35) is arranged in the bottom surface of the airtight cavity (33); a No. 2 through hole (37) connected to the No. 1 through hole (36) is arranged in the curved surface of the closing disk (16); a sampling port penetrating outward is arranged on the side surface of the valve cavity (14); the sampling port is connected to the No. 2 through hole (37) via a No. 2 hose (38); a No. 2 one-way valve for flowing in the direction of the No. 2 hose (38) is arranged in the No. 2 through hole (37); and a No. 3 one-way valve for flowing upward is arranged in the No. 1 through hole (36); the No. 3 one-way valve is located at the lower side of the No. 2 through hole (37).

2. A reflux safety valve with a storage tank according to claim 1, characterized in that: A liquid lifting plate (21) is also slidably connected up and down in the storage chamber (17), the liquid lifting plate (21) is sleeved outside the hollow tube (20), and a lifting shaft (22) threadedly connected to the liquid lifting plate (21) is rotatably connected in the storage chamber (17), and a motor (23) for driving the lifting shaft (22) is fixedly provided on the upper side of the storage tank (13).

3. A reflux safety valve with a storage tank according to claim 1, characterized in that: The valve body (11) has a stepped groove in its upper side surface, and a sliding sleeve (39) is installed in the stepped groove. The closing plate (16) is slidably connected to the sliding sleeve (39) up and down. The control rod (28) has a vertical oil guide groove in its inner surface, and an oil inlet hole (40) and an oil outlet hole (41) in communication with the oil guide groove are provided in the outer curved surface of the control rod (28). The oil outlet hole (41) is located at the lower side of the spring plate (25).

4. A reflux safety valve with a storage tank according to claim 3, characterized in that: The oil inlet hole (40) is located at the lower side of the upper end surface of the spring barrel (12), and the distance between the oil inlet hole (40) and the upper end surface of the spring barrel (12) is smaller than the up and down travel of the control rod (28).

5. A reflux safety valve with a storage tank according to claim 1, characterized in that: An oil retaining ring (42) is provided on the upper end surface of the spring barrel (12), and the oil retaining ring (42) is wound around the outside of the control rod (28).

6. A reflux safety valve with a storage tank according to claim 1, characterized in that: A plug (43) is provided at the sampling port, and the plug (43) is threadedly connected inside the sampling port.

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