An online detecting pilot operated safety valve

Abstract

The present application relates to a kind of online detection pilot safety valve, including main valve, pilot valve, main valve includes main valve body, main valve seat, main valve flap, main valve cover, pilot valve includes pilot valve body, pilot valve seat, pilot valve flap, pilot valve cover and pressure setting device;Setting pressure detection device is arranged on pilot valve inlet channel, can be verified and adjusted setting pressure on line, ensure pipeline continuous operation, with setting pressure detection, verification, adjust convenient, setting pressure accurate, stable, improve pipeline system operating efficiency and other advantages.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of valves, and in particular to a pilot safety valve. BACKGROUND

[0002] The pilot safety valve needs to re-verify whether the set pressure of the valve still maintains the original pressure value after being used in the pipeline for a period of time. The traditional pilot safety valve is disassembled from the pipeline and placed on the test bench for detection. The disadvantage is that some pipelines and equipment are in operation all the year round, and if the valve is disassembled, it will cause great loss. If the set pressure of the safety valve is inaccurate during this period, it will cause the valve to open ahead of time or delay, affecting the normal operation of the pipeline or equipment. SUMMARY

[0003] In view of the technical defects in the prior art, the present application provides an online detection pilot safety valve which can detect, verify and adjust the set pressure, is convenient to detect and verify, has good stability and high accuracy of the set pressure.

[0004] The present application is realized by the following technical scheme:

[0005] An online detection pilot safety valve comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve seat, a main valve flap and a main valve cover. The main valve cover is installed on the upper end surface of the main valve body, and the main valve seat is installed in the inner cavity of the main valve body. A guide sleeve is installed between the main valve cover and the main valve body. The main valve flap is provided with a sealing surface that cooperates with the main valve seat. The outer cylindrical surface of the main valve flap and the inner hole wall of the guide sleeve are dynamically sealed to form a piston structure. A main spring is installed in the main piston cavity formed between the upper end surface of the main valve flap and the lower end surface of the main valve cover. The pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve flap, a pilot valve cover and a pressure setting device. The pilot valve inlet channel is communicated with the main valve body inlet cavity through a lower connecting pipe, and the main piston cavity is communicated with the pilot valve pressure injection hole through an upper connecting pipe. The characteristic is that a set pressure detection device is arranged on the pilot valve inlet channel. The set pressure detection device is composed of a detection interface and a flow channel switching device. A plug is installed on the detection interface. The flow channel switching device is composed of a switching hole and a switching rod. The switching hole passes through the pilot valve inlet channel to form a cross-shaped structure perpendicular to each other. The switching hole is concentric with the pressure injection hole, and a limiting step is arranged therebetween. The switching rod is dynamically sealed in the switching hole. The switching rod is provided with a drainage hole composed of a horizontal hole and a vertical hole. The horizontal hole is communicated with the detection interface, and the vertical hole is communicated with the pilot valve seat inlet when the switching rod moves to the right end position. The switching rod is provided with a tension device at one end of the detection interface.

[0006] Preferably, an anti-jamming hole is arranged between the pilot valve inlet channel below the switching hole and the pressure injection hole.

[0007] Preferably, a radial positioning step is arranged between the detection interface and the switching hole, and a positioning block is fixedly arranged on the radial positioning step, the positioning block is provided with an axial flow-through hole and an anti-rotation hole, and the end face of the switching rod is provided with an anti-rotation pin matched with the anti-rotation hole.

[0008] Preferably, the tension device is composed of a reset spring arranged between the positioning block and the end face of the switching rod.

[0009] Preferably, the tension device is composed of magnetic poles arranged between the positioning block and the end face of the switching rod.

[0010] Preferably, a flow regulating rod is arranged on the guide valve inlet channel below the anti-jamming hole.

[0011] Preferably, the guide valve body is composed of a lower valve body and an upper valve body which are sealingly connected to each other through threads, the lower valve body is fixedly arranged on the plane of the main valve cover through a connecting plate, the pressure setting detection device is arranged in the upper valve body, and the guide valve seat is arranged on the upper end face of the upper valve body; the guide valve cover is fixedly arranged on the outer circular face of the upper end of the upper valve body through threads, and the side wall of the guide valve cover is provided with a discharge port; the lower end face of the guide valve flap is provided with a sealing face matched with the guide valve seat, the outer periphery of the guide valve flap is arranged in the guide hole of the guide valve cover, the upper end face is connected with the pressure setting device, and the pressure setting device is a spring type pressure setting device.

[0012] The present application has the advantages that the pressure setting detection device arranged on the guide valve inlet channel can detect, verify and adjust the setting pressure on line, ensures continuous operation of the pipeline, has the advantages of convenient setting pressure detection, verification and adjustment, accurate and stable setting pressure, and improved pipeline system operation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a structural schematic view of the present application.

[0014] In the figure, 1 is a main valve body, 2 is an inlet cavity, 3 is a main valve seat, 4 is a main valve flap, 5 is a guide sleeve, 6 is a main spring, 7 is an outlet cavity, 8 is a main valve cover, 9 is an upper connecting pipe, 10 is a connecting plate, 11 is a flow regulating rod, 12 is a switching hole, 13 is a sealing ring, 14 is an inlet channel, 15 is a lower connecting pipe, 16 is a lower valve body, 17 is an upper valve body, 18 is a switching rod, 19 is a screw plug, 20 is an anti-rotation pin, 21 is a positioning block, 22 is an axial flow-through hole, 23 is a reset spring, 24 is a drainage hole, 25 is a discharge port, 26 is a regulating ring, 27 is a guide valve flap, 28 is a guide valve rod, 29 is a spring, 30 is a regulating screw sleeve, 31 is a valve cap, 32 is an anti-jamming hole, 33 is a guide valve cover, and 34 is a main piston cavity. DETAILED DESCRIPTION

[0015] As Figure 1The online detection pilot safety valve comprises a main valve and a pilot valve, the main valve comprises a main valve body 1, a main valve seat 3, a main valve flap 4, and a main valve cover 8, the main valve cover 8 is installed on the upper end surface of the main valve body 1, the main valve seat 3 is installed in the inner cavity of the main valve body 1, a guide sleeve 5 is installed between the main valve cover 8 and the main valve body 1, the main valve flap 4 is provided with a sealing surface matched with the main valve seat 3, the outer cylindrical surface of the main valve flap 4 and the inner hole wall of the guide sleeve 5 are in dynamic sealing cooperation to form a piston structure, a main spring 6 is installed in the main piston cavity 34 formed between the upper end surface of the main valve flap 4 and the lower end surface of the main valve cover 8, so as to prevent the main valve flap 4 from vibrating and damaging the sealing surface, and the main valve body 1 is provided with an inlet cavity 2 and an outlet cavity 7; the pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve flap 27, a pilot valve cover 33, and a pressure setting device, the inlet channel 14 of the pilot valve is communicated with the inlet cavity 2 of the main valve body 1 through a lower connecting pipe 15, the main piston cavity 34 is communicated with a pilot valve injection pressure hole through an upper connecting pipe 9, and the pilot valve injection pressure hole is communicated with the inlet channel 14; the pilot valve is characterized in that a setting pressure detection device is arranged on the inlet channel 14 of the pilot valve, the setting pressure detection device is composed of a detection interface and a flow channel switching device, a screw plug 19 is installed on the detection interface, the flow channel switching device is composed of a switching hole 12 and a switching rod 18, the switching hole 12 penetrates through the inlet channel 14 of the pilot valve to form a cross-shaped structure perpendicular to each other, that is, the two side ports of the switching hole 12 are located on the two sides of the inlet channel 14 in the radial direction, the switching hole 12 is concentric with the injection pressure hole, a limiting step is arranged between the switching hole 12 and the injection pressure hole to limit the moving position of the switching rod 18 to the right, and the switching hole 12 can also be located on the upper side of the injection pressure hole; the switching rod 18 is installed in dynamic sealing in the switching hole 12, the switching rod 18 is provided with a drainage hole 24 composed of a horizontal hole and a vertical hole, the horizontal hole is communicated with the detection interface, and the vertical hole is communicated with the flow channel of the pilot valve seat when the switching rod 18 moves to the right end position, the switching rod 18 is provided with a tension device at one end of the detection interface to generate a tension force to the detection interface direction, so as to ensure that the inlet channel 14 is communicated with the flow channel of the pilot valve seat in the working state. A sealing ring 13 is installed on the outer cylindrical surface of the switching rod 18 to improve the sealing performance between the switching rod 18 and the switching hole 12. In the normal working state of the valve, the screw plug 19 is installed on the detection interface, the switching rod 18 is located on one side of the detection interface, the medium pressure in the main valve inlet cavity 2 is introduced into the inlet channel 14 of the pilot valve through the lower connecting pipe 15, and then introduced into the main piston cavity 34 through the upper connecting pipe 9, the main valve flap 4 is closed when the medium pressure in the main valve inlet cavity 2 is less than the setting pressure, and the main valve flap 4 is opened when the medium pressure in the main valve inlet cavity 2 is greater than the setting pressure; when it is necessary to detect and adjust the setting pressure, the pilot valve detection interface joint is pressurized, the switching rod 18 moves to the right under the action of the gas pressure, the channel between the flow channel of the pilot valve seat and the inlet channel 14 and the pilot valve injection pressure hole is cut off, and the gas pressure enters the pilot valve seat inlet through the drainage hole 24 to detect and debug the setting pressure of the pressure setting device.

[0016] Radial positioning step is arranged between detecting interface and switching hole 12, positioning block 21 is fixedly installed on the radial positioning step, positioning block 21 is provided with axial flow hole 22 and anti-rotation hole, end surface of switching rod 18 is provided with anti-rotation pin 20 matched with the anti-rotation hole, and rotation of switching rod 18 is prevented.

[0017] The pulling device is composed of reset spring 23 installed between positioning block 21 and end surface of switching rod 18, and the switching rod 18 is pulled to left reset under normal working state of the valve.

[0018] The pulling device is composed of magnetic poles matched with each other arranged between positioning block 21 and end surface of switching rod 18.

[0019] Anti-blocking hole 32 is arranged between inlet channel 14 below switching hole 12 and injection hole, medium in inlet channel 14 passes through anti-blocking hole 32 to enter right end of switching rod 18, and switching rod 18 is pushed to move left, so that switching rod 18 is prevented from blocking the channel between inlet channel 14 and guide valve seat flow channel and injection hole under working state of the valve.

[0020] Flow adjusting rod 11 is arranged on inlet channel below anti-blocking hole 32, and the speed of medium entering main piston cavity 34 is controlled.

[0021] The guide valve body is composed of lower valve body 16 and upper valve body 17 sealedly connected with each other through threads, lower valve body 16 is fixedly installed on the plane of main valve cover 8 through connecting plate 10, pressure detecting device is arranged in upper valve body 17, and guide valve seat is arranged on the upper end surface of upper valve body 17; guide valve cover 33 is fixedly installed on the outer circumferential surface of upper end of upper valve body 17 through threads, discharge port 25 is arranged on the side wall of guide valve cover 33; lower end surface of guide valve flap 27 is provided with sealing surface matched with guide valve seat, guide valve flap 27 is installed in the guide hole of guide valve cover 33 in outer periphery, upper end surface is connected with pressure adjusting device, and the pressure adjusting device is spring type pressure adjusting device. The spring type pressure adjusting device is composed of guide valve rod 28, spring 29 and adjusting screw sleeve 30, and valve cap 31 is arranged on guide valve cover 33 on the upper end of adjusting screw sleeve 30. Adjusting ring 26 is arranged on the outer circumference of guide valve seat, and opening and closing pressure difference is adjusted.

Claims

1. An online detecting pilot operated safety valve, comprising a main valve and a pilot valve, the main valve comprising a main valve body (1), a main valve seat (3), a main valve disc (4), a main valve cover (8), the main valve cover (8) being installed on the upper end surface of the main valve body (1), the main valve seat (3) being installed in the inner cavity of the main valve body (1), a guide sleeve (5) being installed between the main valve cover (8) and the main valve body (1), the main valve disc (4) being provided with a sealing surface matched with the main valve seat (3), the outer cylindrical surface of the main valve disc (4) and the inner hole wall of the guide sleeve (5) being matched in dynamic sealing to form a piston structure, a main spring (6) being installed in the main piston cavity (34) formed between the upper end surface of the main valve disc (4) and the lower end surface of the main valve cover (8), the main valve body (1) being provided with an inlet cavity (2) and an outlet cavity (7); the pilot valve comprising a pilot valve body, a pilot valve seat, a pilot valve disc (27), a pilot valve cover (33) and a pressure setting device, the inlet channel (14) of the pilot valve being communicated with the inlet cavity (2) of the main valve body (1) through a lower connecting pipe (15), the main piston cavity (34) being communicated with the pilot valve injection hole through an upper connecting pipe (9), the pilot valve injection hole being communicated with the inlet channel (14); the valve is characterized in that: The setting pressure detection device is arranged on the inlet channel of the pilot valve, and is composed of a detection interface and a flow channel switching device. A screw plug (19) is arranged on the detection interface. The flow channel switching device is composed of a switching hole (12) and a switching rod (18). The switching hole (12) passes through the inlet channel of the pilot valve to form a cross-shaped structure perpendicular to each other. The switching hole (12) is concentric with the injection hole, and a limiting step is arranged between the switching hole (12) and the injection hole. The switching rod (18) is arranged in the switching hole (12) and is dynamically sealed. A drainage hole (24) composed of a horizontal hole and a vertical hole is arranged in the switching rod (18). The horizontal hole is communicated with the detection interface, and the vertical hole is communicated with the flow channel of the pilot valve seat when the switching rod (18) is located at the right end position. A tension device is arranged at one end of the switching rod (18). A sealing ring (13) is arranged on the outer cylindrical surface of the switching rod (18). In the working state of the valve, the screw plug (19) is arranged on the detection interface, and the switching rod (18) is located at one side of the detection interface.

2. The online pilot operated safety valve of claim 1 wherein: A radial positioning step is arranged between the detection interface and the switching hole (12). A positioning block (21) is fixedly arranged on the radial positioning step. The positioning block (21) is provided with an axial flow hole (22) and an anti-rotation hole. An anti-rotation pin (20) is arranged on the end face of the switching rod (18) and matched with the anti-rotation hole.

3. The online pilot operated safety valve of claim 2, wherein: The tension device is composed of a reset spring (23) arranged between the positioning block (21) and the end face of the switching rod (18).

4. The online pilot operated safety valve of claim 2, wherein: The tension device is composed of magnetic poles arranged between the positioning block (21) and the end face of the switching rod (18) and matched with each other.

5. The online pilot operated safety valve of claim 1, wherein: A clamping prevention hole (32) is arranged between the inlet channel below the switching hole (12) and the injection hole.

6. The online detecting pilot operated safety valve according to claim 1 or 2 or 3 or 4 or 5, characterized in that: A flow adjusting rod (11) is arranged on the inlet channel below the clamping prevention hole (32).

7. The online detecting pilot operated safety valve according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The pilot valve body is composed of a lower valve body (16) and an upper valve body (17) which are sealedly connected through threads. The lower valve body (16) is fixedly arranged on the plane of the main valve cover (8) through a connecting plate (10). The setting pressure detection device is arranged in the upper valve body (17), and the pilot valve seat is arranged on the upper end face of the upper valve body (17). A pilot valve cover (33) is fixedly arranged on the outer cylindrical surface of the upper end of the upper valve body (17) through threads. A discharge port (25) is arranged on the side wall of the pilot valve cover (33). A pilot valve flap (27) is arranged in the guide hole of the pilot valve cover (33) through the outer periphery. The lower end face of the pilot valve flap (27) is provided with a sealing surface matched with the pilot valve seat. The upper end face of the pilot valve flap (27) is connected with a pressure setting device. The pressure setting device is a spring type pressure setting device.

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