A pilot operated water hammer relief valve

Abstract

A pilot water hammer relief valve, comprising a water hammer relief valve and a pilot valve, the pilot valve comprising a pilot valve body, a pilot valve core arranged in the pilot valve body, a pilot valve seat arranged between the pilot valve core and the pilot valve body, the pilot valve seat located in the middle of the pilot valve core, an A hole opened in the rear wall of the pilot valve body; an adjusting hole opened from the top surface of the pilot valve body to the A hole, an adjusting device arranged in the adjusting hole; a C hole opened in the rear wall of the pilot valve body; a first pilot hole opened in the front end of the pilot valve body; an M hole opened in the bottom surface of the pilot valve body; a B hole and an opening and closing hole opened in the front wall of the pilot valve body, the opening and closing hole located between the B hole and the M hole, an opening and closing device arranged in the opening and closing hole; one end of a first pilot pressure pipeline in communication with an upstream pipeline of a main valve body, the other end in communication with the pilot valve body; one end of a second pressure pipeline in communication with an inlet end of the main valve body, the other end in communication with the A hole; one end of a third pressure pipeline in communication with the main valve body at the front end of the valve disc, the other end in communication with the B hole; one end of a relief pipeline in communication with the rear end of the main valve body, the other end in communication with the C hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water hammer relief valve, in particular to a pilot water hammer relief valve. BACKGROUND

[0002] Water hammer relief valve is usually the last line of defense to protect the pipeline, which can protect the entire pipeline system when all other safety devices fail. The traditional pilot water hammer relief valve mainly has the following shortcomings:

[0003] 1. In order to facilitate the pilot valve debugging, a needle valve is generally arranged on the outside pipeline of the pilot valve body to adjust the flow into the relief valve cavity, so as to reduce the difficulty of pilot valve setting. However, the needle valve is arranged separately on the outside pipeline, and the opening of the needle valve is easily affected by external factors to cause position change or damage, so that it cannot be ensured that the set value of the pilot valve is accurate, and further it will affect the accuracy of the relief valve.

[0004] 2. The medium entering the relief valve passes through the pipeline filter and the micro channel of the pilot valve, and naturally has the function of throttling and pressure reduction, so the pressure entering the valve cavity is generally lower than the pressure of the pipeline before the relief valve. When the set pressure value of the relief valve is low, or the operating pressure is low, the pressure difference may cause the relief valve to fail to close and seat, thereby causing an accident. SUMMARY

[0005] In order to solve the above problems, the present application provides the following solutions:

[0006] The application discloses a pilot water hammer relief valve, which comprises a water hammer relief valve and a pilot valve, the water hammer relief valve comprises a main valve body, a valve sleeve, a valve clack and a valve shaft are arranged in the main valve body, the valve shaft is sleeved with the valve clack, the valve sleeve is sleeved outside the valve clack, an inner part of the valve sleeve is formed with a piston cavity, and a rear end of the valve clack is used as a piston and moves in the piston cavity; the pilot valve comprises a pilot valve body, the pilot valve body comprises a front cavity body and a rear cavity body, a limiting surface is arranged between the front cavity body and the rear cavity body, a through hole is formed in the center of the limiting surface, a pilot valve core is arranged in the pilot valve body, and a rear end surface of a front end head of the pilot valve core can abut against a front end of the limiting surface; a pilot valve seat is embedded in a front end of the rear cavity body, a sealing ring is embedded in a rear end of the rear cavity body, and a gap is formed between the pilot valve seat and the limiting surface, the gap is a pilot groove, and a rear end of the pilot valve core passes through the through hole, the pilot valve seat and the sealing ring in sequence; the pilot valve core can slide back and forth along the pilot valve seat and the sealing ring, a flow guide groove is formed in a side wall of the pilot valve core between the sealing ring and the pilot valve seat, an A hole is formed in a rear wall of the pilot valve body and corresponds to the pilot groove, an adjusting hole is formed from a top surface of the pilot valve body to the A hole, an adjusting device for adjusting the flow of the A hole is arranged in the adjusting hole, a C hole is formed in the rear wall of the pilot valve body and communicates with the flow guide groove, a first pilot hole is formed from a top part of a front end of the pilot valve body to a front end of the pilot valve core, an M hole is formed from a bottom surface of the pilot valve body to the pilot valve core and communicates with the piston cavity in the main valve body, a B hole and an on-off hole are formed in a front wall of the pilot valve body from a front end to a rear end in sequence, the B hole and the M hole are arranged to communicate with a communication channel, the on-off hole corresponds to the communication channel between the B hole and the M hole, an on-off device for opening or closing the communication channel between the B hole and the M hole is arranged in the on-off hole, the pilot water hammer relief valve further comprises a first pilot pressure introduction pipeline, a second pilot pressure introduction pipeline, a third pilot pressure introduction pipeline and a pressure relief pipeline, one end of the first pilot pressure introduction pipeline communicates with an upstream pipeline of the main valve body, the other end of the first pilot pressure introduction pipeline communicates with a gap between the front end surface of the limiting surface and the pilot valve core through the first pilot hole, one end of the second pressure introduction pipeline communicates with an inlet end of the main valve body, the other end of the second pressure introduction pipeline communicates with the A hole, one end of the third pressure introduction pipeline communicates with a front end of the valve clack and the main valve body, the other end of the third pressure introduction pipeline communicates with the B hole, and one end of the pressure relief pipeline communicates with a rear end of the main valve body, the other end of the pressure relief pipeline communicates with the C hole.

[0007] Further, the on-off device comprises an on-off valve core, an on-off sleeve and a blocking cover, the on-off valve core is sleeved with the on-off sleeve, the on-off sleeve and the on-off valve core are screwed with each other, the on-off sleeve is screwed with an inner wall of the on-off hole to arrange the on-off valve core in the on-off hole, and the outer end of the on-off sleeve is provided with the blocking cover to block the on-off hole.

[0008] Further, the adjusting device comprises an adjusting valve core, an adjusting sleeve and a protection cover, the adjusting sleeve is screwed outside the adjusting valve core, the adjusting sleeve is screwed in the adjusting hole, and the top end of the adjusting sleeve is sleeved with the protection cover.

[0009] Further, the communication channels of the B hole and the M hole communicate with the side wall of the pilot valve body, and the end of the communication channel is blocked by the blocking block.

[0010] Further, a filter is arranged on the second pilot pressure introduction pipeline.

[0011] Further, the guide valve body top is further provided with a detection hole corresponding to the M hole and communicated with the guide valve core, and a pressure gauge assembly is arranged in the detection hole; the pressure gauge assembly comprises a pressure gauge valve and a pressure gauge, the lower end of the pressure gauge valve is communicated with the detection hole, and the upper end of the pressure gauge valve is connected with the pressure gauge.

[0012] Further, the guide valve body front end is provided with a coarse adjustment device, and the guide valve body rear end is provided with a fine adjustment device, the coarse adjustment device and the fine adjustment device adjust the pilot valve setting pressure value by rotating and adjusting the initial position of the guide valve core.

[0013] The beneficial effects of the present application are:

[0014] 1. The adjustment device and the switch device are integrated on the guide valve body, which can effectively avoid the interference of external factors on the adjustment accuracy, reduce the pipeline leakage points and save the installation space.

[0015] 2. The medium at the front end of the main valve body is directly introduced into the main valve piston cavity through the main valve body and the switch device, which can provide power for the valve clack back seat in the main valve body, and avoid the problem that the pressure relief valve cannot be closed after being opened due to small medium pressure drop. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an illustrative diagram of the application;

[0017] Figure 2 It is a switch device communication structure schematic diagram;

[0018] Figure 3 It is a top view of the application;

[0019] Figure 4 It is a pilot valve structure schematic diagram;

[0020] Figure 5 It is a Figure 1 pilot valve front view in the middle;

[0021] Figure 6 It is a Figure 5 A-A sectional view in the middle;

[0022] Figure 7 It is a Figure 5 B-B sectional view in the middle;

[0023] Figure 8 It is a Figure 5 C-C sectional view in the middle;

[0024] Figure 9 It is a Figure 5 D part enlarged schematic diagram in the middle.

[0025] In the figure: 1. main valve body; 2. pilot valve; 211. pilot valve body; 212. pilot valve seat; 213. sealing ring; 214. pilot valve core; 215. pressure gauge; 216. adjusting device; 2161. protective cover; 2162. adjusting sleeve; 2163. adjusting valve core; 217. switch device; 2171. cover; 2172. switch sleeve; 2173. switch valve core; 218. sealing block; 219. limiting surface; 21. coarse adjusting device; 22. fine adjusting device; 23. filter; 3. first pilot pressure pipeline; 4. second pilot pressure pipeline; 5. third pilot pressure pipeline; 6. pressure relief pipeline; 7. B hole; 8. M hole; 9. A hole; 10. C hole; 11. valve sleeve; 12. valve flap; 13. valve shaft; 14. piston cavity; 15. pilot groove; 16. flow guide groove. DETAILED DESCRIPTION

[0026] The application will now be described in further detail with reference to the drawings. These drawings are simplified schematic diagrams which only show the basic structure of the application in a schematic manner, and thus only show the components which are relevant to the application.

[0027] Example 1: As shown in Figures 1-9

[0028] ​The application discloses a pilot water hammer relief valve, which comprises a water hammer relief valve and a pilot valve 2. The water hammer relief valve comprises a main valve body 1, a valve sleeve 11, a valve clack 12 and a valve shaft 13 arranged in the main valve body 1, the valve shaft 13 is sleeved with the valve clack 12, the valve sleeve 11 is sleeved outside the valve clack 12, an inner part of the valve sleeve 11 is formed with a piston cavity 14, and a rear end of the valve clack 12 is arranged as a piston and moves in the piston cavity 14. The pilot valve 2 comprises a pilot valve body 211, the pilot valve body 211 comprises a front cavity and a rear cavity, a limiting surface 219 is arranged between the front cavity and the rear cavity, a through hole is formed in the center of the limiting surface 219, a pilot valve core 214 is arranged in the pilot valve body 211, and a rear end surface of a front end head of the pilot valve core 214 can abut against a front end of the limiting surface 219. A pilot valve seat 212 is embedded at a front end of the rear cavity, a sealing ring 213 is embedded at a rear end of the rear cavity, and a gap is formed between the front end of the pilot valve seat 212 and the limiting surface 219, the gap is a pilot groove 15, and the rear end of the pilot valve core 214 passes through the through hole, the pilot valve seat 212 and the sealing ring 213 in sequence. The pilot valve core 214 can slide forward and backward along the pilot valve seat 212 and the sealing ring 213, a flow guide groove 16 is formed in a side wall of the pilot valve core 214 between the sealing ring 213 and the pilot valve seat 212, an A hole 9 is formed in a rear wall of the pilot valve body 211 and corresponds to the pilot groove 15, an adjusting hole is formed from a top surface of the pilot valve body 211 to the A hole 9, an adjusting device 216 for adjusting the flow of the A hole 9 is arranged in the adjusting hole, a C hole 10 is formed in the rear wall of the pilot valve body 211 and communicates with the flow guide groove 16, a first pilot hole is formed from a top part of a front end of the pilot valve body 211 to a front end of the pilot valve core 214, an M hole 8 is formed from a bottom surface of the pilot valve body 211 to the pilot valve core 214, and the M hole 8 communicates with the piston cavity 14 in the main valve body 1, a B hole 7 and an on-off hole are formed in a front wall of the pilot valve body 211 from a front end to a rear end in sequence, the B hole 7 and the M hole 8 are arranged to communicate with each other, the on-off hole corresponds to the communication channel between the B hole 7 and the M hole 8, and an on-off device 217 for opening or closing the communication channel between the B hole 7 and the M hole 8 is arranged in the on-off hole. The pilot water hammer relief valve further comprises a first pilot pressure introduction pipeline 3, a second pilot pressure introduction pipeline 4, a third pilot pressure introduction pipeline 5 and a pressure relief pipeline 6. One end of the first pilot pressure introduction pipeline 3 communicates with an upstream pipeline of the main valve body 1, the other end of the first pilot pressure introduction pipeline 3 communicates with a gap between the pilot valve core 214 and the front end surface of the limiting surface 219 through the first pilot hole. One end of the second pilot pressure introduction pipeline 4 communicates with an inlet end of the main valve body 1, and the other end of the second pilot pressure introduction pipeline 4 communicates with the A hole 9. One end of the third pilot pressure introduction pipeline 5 communicates with a front end of the valve clack 12 and the main valve body 1, and the other end of the third pilot pressure introduction pipeline 5 communicates with the B hole 7. One end of the pressure relief pipeline 6 communicates with a rear end of the main valve body 1, and the other end of the pressure relief pipeline 6 communicates with the C hole 10.

[0029] The on-off device 217 comprises an on-off valve core 2173, an on-off sleeve 2172 and a cover 2171. The on-off valve core 2173 is sleeved with the on-off sleeve 2172, the on-off sleeve 2172 and the on-off valve core 2173 are screwed with each other, the on-off sleeve 2172 is screwed with an inner wall of the on-off hole to arrange the on-off valve core 2173 in the on-off hole, and the outer end of the on-off sleeve 2172 is provided with the cover 2171 to block the on-off hole.

[0030] The adjusting device 216 comprises an adjusting valve core 2163, an adjusting sleeve 2162 and a protective cover 2161, the adjusting sleeve 2162 is screwed on the adjusting valve core 2163, the adjusting sleeve 2162 is screwed in the adjusting hole, and the adjusting sleeve 2162 is sleeved with the protective cover 2161 at the top end.

[0031] The top of the pilot valve body 211 is also provided with a detection hole, the detection hole is arranged in correspondence with the M hole 8 and is in communication with the pilot valve core 214, and a pressure gauge assembly is arranged in the detection hole; the pressure gauge assembly comprises a pressure gauge valve and a pressure gauge 215, the lower end of the pressure gauge valve is in communication with the detection hole, and the upper end of the pressure gauge valve is connected with the pressure gauge 215.

[0032] The front end of the pilot valve body 211 is provided with a coarse adjusting device 21, the rear end of the pilot valve body 211 is provided with a fine adjusting device 22, the coarse adjusting device 21 and the fine adjusting device 22 adjust the set pressure value of the pilot valve by rotating the initial position of the pilot valve core 214.

[0033] The channels where the B hole 7 and the M hole 8 are located are in communication with the side wall of the pilot valve body 211, and the end of the channel is blocked by the sealing block 218.

[0034] The second pilot pressure pipeline 4 is provided with a filter 23.

[0035] In normal operation, the switch device 217 is in a closed state, the pilot valve core 214 is sealed with the sealing ring 213, the protective cover 2161 of the adjusting device 216 is removed, and the flow of the medium into the piston cavity of the main valve body 1 can be adjusted by changing the screwed length of the adjusting valve core 2163. When the pipeline pressure on the upstream side of the main valve body 1 rises and is higher than the set pressure, the pilot valve core 214 moves to the left under the action of the medium and is sealed with the pilot valve seat 212, a gap is formed between the pilot valve core 214 and the sealing ring 213, the medium in the piston cavity of the main valve body 1 is discharged to the downstream pipeline, the main valve body 1 is opened, and the high-pressure medium on the upstream side is discharged.

[0036] When the pipeline pressure is discharged and the valve leaks, the switch device 217 is opened, and the medium at the front end of the main valve body 1 is directly introduced into the piston cavity 14 of the main valve body 1 through the second pilot pressure pipeline 4 and the third pilot pressure pipeline 5. If the valve is sealed at this time, it can be judged that the cause of the valve leakage is that the valve disc 12 is not back to the seat; if the valve still leaks, the sealing surface of the valve disc 12 has been damaged and needs to be repaired.

[0037] The adjusting device 216 and the switch device 217 are integrated on the pilot valve body 11, and a protection device is arranged, so that the influence of human factors, mechanical collision and other external factors is avoided, and the leakage points and installation space of the pipeline outside the pilot valve body 211 are reduced.

[0038] The adjusting device 216 and the switch device 217 are integrated on the pilot valve body 211, so that the interference of external factors on the adjusting precision can be effectively avoided, meanwhile, the pipeline leakage points are reduced and the installation space is saved. Through the main valve body 1 and the switch device 217, the medium at the front end of the main valve body 1 is directly introduced into the piston cavity 14 of the main valve body 1, so that the power for the valve disc 12 in the main valve body to return to the seat can be provided, and the problem that the pressure relief valve cannot be closed after being opened due to small pressure drop of the medium can be avoided.

[0039] Finally, it should be noted that the above enumeration is only a specific embodiment of the present application. Obviously, the present application is not limited to the above embodiment, but can have many variations. All variations that can be directly derived or inferred from the disclosed content by those of ordinary skill in the art should be considered as the protection scope of the present application.

Claims

1. A pilot operated water hammer relief valve, comprising a water hammer relief valve and a pilot valve, the water hammer relief valve comprising a main valve body, a valve sleeve, a valve disc and a valve shaft, the valve shaft being sleeved with the valve disc, the valve sleeve being sleeved outside the valve disc, an inner part of the valve sleeve forming a piston cavity, a rear end of the valve disc serving as a piston moving in the piston cavity; characterized in that: The pilot valve comprises a pilot valve body, the pilot valve body comprises a front cavity and a rear cavity, a limiting surface is arranged between the front cavity and the rear cavity, a through hole is arranged in the center of the limiting surface, a pilot valve core is arranged in the pilot valve body, and the rear end surface of the front end head of the pilot valve core can abut against the front end of the limiting surface; a pilot valve seat is embedded in the front end of the rear cavity, a sealing ring is embedded in the rear end of the rear cavity, and a gap exists between the front end of the pilot valve seat and the limiting surface, the gap being a pilot groove, the rear end of the pilot valve core sequentially passes through the through hole, the pilot valve seat and the sealing ring; the pilot valve core can slide forward and backward along the pilot valve seat and the sealing ring, a flow guide groove is arranged in the side wall of the pilot valve core between the sealing ring and the pilot valve seat; an A hole is arranged in the rear wall of the pilot valve body corresponding to the pilot groove; an adjusting hole is arranged from the top surface of the pilot valve body to the A hole, and an adjusting device for adjusting the flow of the A hole is arranged in the adjusting hole; a C hole is arranged in the rear wall of the pilot valve body and communicates with the flow guide groove; a first pilot hole is arranged from the top of the front end of the pilot valve body to the front end of the pilot valve core; an M hole is arranged from the bottom surface of the pilot valve body to the pilot valve core and communicates with the piston cavity in the main valve body; a B hole and an on-off hole are sequentially arranged in the front wall of the pilot valve body from the front end to the rear end, the B hole and the M hole are arranged to communicate through a communication channel, the on-off hole corresponds to the communication channel between the B hole and the M hole, and an on-off device for opening or closing the communication channel between the B hole and the M hole is arranged in the on-off hole; the pilot water hammer relief valve further comprises a first pilot pressure introduction pipeline, a second pilot pressure introduction pipeline, a third pilot pressure introduction pipeline and a pressure relief pipeline; one end of the first pilot pressure introduction pipeline communicates with the upstream pipeline of the main valve body, and the other end communicates with the gap between the front end surface of the limiting surface and the pilot valve core through the first pilot hole; one end of the second pilot pressure introduction pipeline communicates with the inlet end of the main valve body, and the other end communicates with the A hole; one end of the third pilot pressure introduction pipeline communicates with the main valve body at the front end of the valve disc, and the other end communicates with the B hole; one end of the pressure relief pipeline communicates with the rear end of the main valve body, and the other end communicates with the C hole.

2. A pilot operated water hammer relief valve as defined in claim 1 wherein: The on-off device comprises an on-off valve core, an on-off sleeve and a cover, the on-off sleeve is sleeved on the outside of the on-off valve core, the on-off sleeve and the on-off valve core are screwed with each other, the on-off sleeve is screwed with the inner wall of the on-off hole to arrange the on-off valve core in the on-off hole, and the outer end of the on-off sleeve is provided with the cover to block the on-off hole.

3. A pilot operated water hammer relief valve as defined in claim 1 wherein: The adjusting device comprises an adjusting valve core, an adjusting sleeve and a protection cover, the adjusting sleeve is screwed on the outside of the adjusting valve core, the adjusting sleeve is screwed in the adjusting hole, and the top end of the adjusting sleeve is sleeved with the protection cover.

4. A pilot operated water hammer relief valve as defined in claim 1 wherein: The channels where the B hole and the M hole are located both communicate with the side wall of the pilot valve body, and the end of the channel is blocked by a blocking block.

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