Pilot type atmosphere relief valve

Abstract

The pilot type atmosphere relief valve is characterized by further comprising a self-tightening sealing ring which is arranged among a valve cover, a valve body and a valve cover pressing plate and is self-adaptive according to pressure; an inclined face is arranged on one side of the lower end of the self-tightening sealing ring in an inclined mode, and an inclined face matched with the inclined face is arranged on the valve cover. The self-tightening sealing ring is additionally arranged among the valve cover, the valve body and the valve cover pressing plate, when upward pressure is exerted on the valve cover by a medium, the valve cover exerts extrusion force on the self-tightening sealing ring through cooperation of the inclined faces, the self-tightening sealing ring deforms after being pressed to be tightly attached to the valve cover, the valve body and the valve cover pressing plate, and therefore the valve cover is tightly pressed. And the self-tightening sealing ring is a graphite ring, so that the self-tightening sealing ring is convenient to disassemble and assemble by means of the self-lubricating property of the graphite ring, and the problem of jamming is not easy to occur.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of atmospheric release valves, specifically pilot type atmospheric release valve. BACKGROUND

[0002] Atmospheric release valve is an important safety protection device, widely used in petroleum, chemical industry, electric power and other industries of pressure vessel or pipeline system, its core function is when system pressure is abnormally high, automatically open, excess medium is discharged to atmosphere, so as to protect system equipment from overpressure damage;When pressure returns to normal, it can also be automatically closed, maintain the normal operation of system.

[0003] Atmospheric release valve in prior art, some common problems are exposed in long-term use. First, the static seal between valve cover and valve body usually uses gasket or O-ring, this kind of seal is prone to external leakage caused by sealing not tight when system pressure fluctuates, especially when pressure is high, not only causes medium loss, but also may cause safety and environmental accidents. Secondly, the traditional single-stage valve core needs to provide huge operating force by actuator to overcome the pressure of medium at the moment of opening, which not only requires high output of actuator, leads to large size and high cost, but also makes it difficult to improve the adjustment accuracy and response speed of valve. In addition, when the valve is opened under high pressure difference, high-speed medium flow will cause severe scouring and impact on internal parts such as valve seat and valve core, which is easy to cause damage to parts, sealing failure and shorten the service life of valve. Therefore, a pilot type atmospheric release valve is proposed. SUMMARY

[0004] The purpose of the present application is to solve the above problems and provide a pilot type atmospheric release valve.

[0005] In order to achieve the above purpose, the present application provides a pilot type atmospheric release valve, which comprises a valve body, a valve seat arranged in the valve body, a valve cover connected to the valve body, a valve cover pressing plate mounted on the valve body for pressing the valve cover to the valve body, a bracket connected to the valve cover, an actuator connected to the bracket, a valve stem having one end connected to the actuator and one end in the valve body, and a pilot valve core connected to the valve stem;It is characterized in that it further comprises a self-tightening sealing ring arranged between the valve cover, the valve body and the valve cover pressing plate, which is self-adaptive according to pressure;The lower end of the self-tightening sealing ring is provided with an inclined surface, and the valve cover is provided with an inclined surface matched with the inclined surface.

[0006] Further preferably, the self-tightening sealing ring is a graphite ring.

[0007] Further preferably, it further comprises a metal edge arranged on the upper and lower sides of the graphite ring to prevent the graphite ring from breaking and loosening after being pressed.

[0008] Further preferably, the sleeve is arranged between the valve cover and the valve seat, and the throttling plates are arranged in a superimposed manner on the sleeve.

[0009] Further preferably, the bottom pad, the spacer, the packing and the anti-extrusion ring are arranged in sequence from bottom to top between the valve cover and the valve stem, and the pressing plate is arranged between the valve cover and the valve stem for pressing the bottom pad, the spacer, the packing and the anti-extrusion ring.

[0010] Further preferably, the pilot valve core comprises a main valve core in sliding connection with the sleeve, a pilot valve core connected to one end of the valve stem and arranged in the main valve core, and a plurality of springs arranged between the main valve core and the pilot valve core, and the main valve core and the pilot valve core are provided with the medium channel.

[0011] The application has the following beneficial effects: the self-tight sealing ring is arranged between the valve cover, the valve body and the valve cover pressing plate, when the valve cover is subjected to upward pressure from the medium, the valve cover applies extrusion force to the self-tight sealing ring through the cooperation of the inclined surface and the inclined surface, the self-tight sealing ring is deformed to tightly adhere to the valve cover, the valve body and the valve cover pressing plate after being subjected to pressure, the sealing performance is better after being subjected to pressure, and the self-tight sealing ring is a graphite ring, which is convenient to disassemble and assemble due to the self-lubricating property of the graphite ring, and is not prone to be stuck. The metal edge is arranged on the upper and lower sides of the graphite ring, and the graphite ring is prevented from being broken and loose after being subjected to pressure, so that the sealing function cannot be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the application; Figure 2 is a local structural schematic diagram of the pilot valve core in the application; Figure 3 is a local structural schematic diagram of the self-tight sealing ring in the application; Figure 4 is a sectional structural schematic diagram of the self-tight sealing ring in the application; Figure 5 is a local structural schematic diagram of the packing in the application.

[0013] Legend: 1, valve body; 2, valve seat; 3, valve cover; 31, inclined surface; 4, valve cover pressing plate; 5, bracket; 6, actuator; 7, pilot valve core; 71, main valve core; 72, pilot valve core; 73, spring; 74, medium channel; 8, self-tight sealing ring; 81, inclined surface; 81, metal edge; 9, sleeve; 91, throttling plate; 92, bottom pad; 93, spacer; 94, packing; 95, anti-extrusion ring; 97, pressing plate; 10, valve stem. DETAILED DESCRIPTION

[0014] The pilot type atmosphere release valve is further described below in combination with the drawings.

[0015] It should be noted that all directional indications such as upper, lower, left, right, front, back, etc. used in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture such as shown in the drawings, and if the specific posture changes, the directional indications also change accordingly.

[0016] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense; for example, "fixation" can be fixed connection, or detachable connection, or integral; and can be mechanical connection, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0017] Referring to Figures 1-5 A pilot type atmosphere release valve, comprising a valve body 1, a valve seat 2 arranged in the valve body 1, a valve cover 3 connected to the valve body 1, a valve cover pressing plate 4 arranged on the valve body 1 for pressing the valve cover 3 to be tightly arranged on the valve body 1, a bracket 5 connected to the valve cover 3, an actuator 6 connected to the bracket 5, a valve rod 10 having one end connected to the actuator 6 and one end arranged in the valve body 1, and a pilot valve core 7 connected to the valve rod 10; characterized in that it further comprises a self-tight sealing ring 8 arranged between the valve cover 3, the valve body 1 and the valve cover pressing plate 4 and self-adapting to pressure; one side of the lower end of the self-tight sealing ring 8 is provided with an inclined surface 81 arranged in an inclined manner, and the valve cover 3 is provided with an inclined surface 31 matched with the inclined surface 81. The self-tight sealing ring 8 is a graphite ring; The actuator 6 is a pneumatic actuator 6; By additionally arranging the self-tight sealing ring 8 between the valve cover 3, the valve body 1 and the valve cover pressing plate 4, when the valve cover 3 is subjected to upward pressure applied by the medium, the valve cover 3 will apply extrusion force to the self-tight sealing ring 8 through the cooperation of the inclined surface 31 and the inclined surface 81, and the self-tight sealing ring 8 will deform to tightly adhere to the valve cover 3, the valve body 1 and the valve cover pressing plate 4 after being subjected to pressure, and its sealing performance is better after being subjected to pressure. Moreover, the self-tight sealing ring 8 is a graphite ring, and by virtue of the self-lubricating property of the graphite ring, the graphite ring is convenient to disassemble and assemble, and is not prone to jamming. In one embodiment, a metal edge 82 is arranged on the upper and lower sides of the graphite ring to prevent the graphite ring from being broken and loose after being subjected to pressure; By arranging the metal edge 82 on the upper and lower sides of the graphite ring, the metal edge 82 can effectively limit the radial and axial deformation of the graphite material, prevent it from being extruded out, and prevent the graphite ring from being broken and loose after being subjected to pressure, so as to fail to play a sealing role.

[0018] In one embodiment, the sleeve 9 is arranged between the valve cover 3 and the valve seat 2, and a plurality of throttling plates 91 are arranged in a stacked manner on the sleeve 9. The plurality of throttling plates 91 arranged in a stacked manner in the sleeve 9 can reduce the pressure of the medium in front of the valve, avoid damage to the inner cavity of the valve body 1, the valve core, and the valve seat 2 caused by the impact of the medium in front of the valve, and improve the service life of the valve.

[0019] In one embodiment, a bottom pad 92, a spacer pad 93, a packing 94, and an anti-extrusion ring 95 are arranged in sequence from bottom to top between the valve cover 3 and the valve stem 10, and a pressing plate 97 is arranged for pressing and mounting the bottom pad 92, the spacer pad 93, the packing 94, and the anti-extrusion ring 95 between the valve cover 3 and the valve stem 10. The bottom pad 92, the spacer pad 93, and the packing 94 are arranged to enhance the sealing between the valve stem 10 and the valve cover 3, and prevent leakage. The anti-extrusion ring 95 and the pressing plate 97 are arranged, the pressing plate 97 is fixedly mounted on the valve cover 3 by screws, and the bottom pad 92, the spacer pad 93, and the packing 94 are pressed and mounted between the valve stem 10 and the valve cover 3 to prevent the bottom pad 92, the spacer pad 93, and the packing 94 from being affected by the sealing performance due to being pressed out.

[0020] In one embodiment, the pilot valve core 7 includes a main valve core 71 in sliding connection with the sleeve 9, a pilot valve core 72 connected to one end of the valve stem 10 and located in the main valve core 71, and a plurality of springs 73 arranged between the main valve core 71 and the pilot valve core 72. The main valve core 71 and the pilot valve core 72 are provided with a medium passage 74. Through the arrangement of the pilot valve core 7, when the actuator 6 drives the pilot valve core 7 to act upward to open the flow path, the pilot valve core 72 is first driven to move upward, the flow path between the upper and lower cavities of the pilot valve core 7 is opened, the pressure between the upper and lower cavities is balanced, and the force required to open the main valve core 71 is reduced, and the balance force when the main valve core 71 is opened is improved. Since the operating force required for opening is greatly reduced, the output of the actuator 6 can be more finely used to adjust the position of the main valve core 71, rather than mainly used to overcome the huge static pressure, thereby significantly improving the accuracy, stability, and response speed of the valve control.

[0021] In use, the device gas pressure is guided into the pneumatic actuator 6 to drive the pneumatic actuator 6 to move the valve rod 10 upward, the valve rod 10 drives the pilot valve core 72 to move upward in the process of moving upward, the pilot valve core 72 opens the flow path between the pilot valve core 72 and the main valve core 71 after moving upward, the two cavities of the pilot valve core 7 are communicated, the pressures are counteracted, the main valve core 71 is driven to move upward in the process of the pilot valve core 7 continuously moving upward, the main valve core 71 opens the valve flow path to release the excess medium after moving upward, and the flow path is cut off after the pneumatic actuator 6 drives the pilot valve core 7 to move downward after the pressure returns to normal.

[0022] The protection scope of the present application is not limited to the above embodiments and their transformations. The routine modifications and replacements made by the skilled in the art based on the content of the embodiments all belong to the protection scope of the present application.

Claims

1. A pilot-operated atmospheric relief valve, comprising a valve body (1), a valve seat (2) disposed within the valve body (1), a valve cover (3) connected to the valve body (1), a valve cover pressure plate (4) mounted on the valve body (1) for pressing the valve cover (3) against the valve body (1), a bracket (5) connected to the valve cover (3), an actuator (6) connected to the bracket (5), a valve stem (10) with one end connected to the actuator (6) and the other end located within the valve body (1), and a pilot-operated valve core (7) connected to the valve stem (10); characterized in that It also includes a self-tightening sealing ring (8) that adapts to pressure and is disposed between the valve cover (3), the valve body (1) and the valve cover pressure plate (4); the self-tightening sealing ring (8) has an inclined surface (81) on one side of its lower end, and the valve cover (3) has an inclined surface (31) that cooperates with the inclined surface (81).

2. The pilot-operated atmospheric relief valve according to claim 1, characterized in that: The self-tightening sealing ring (8) is a graphite ring.

3. A pilot-operated atmospheric relief valve according to claim 2, characterized in that: It also includes metal edging (82) on the upper and lower sides of the graphite ring to prevent the graphite ring from cracking or loosening under pressure.

4. The pilot-operated atmospheric relief valve according to claim 1, characterized in that: It also includes a sleeve (9) disposed between the valve cover (3) and the valve seat (2) and several throttling plates (91) disposed on the sleeve (9) in a stacked manner.

5. A pilot-operated atmospheric relief valve according to claim 1, characterized in that: It also includes a bottom gasket (92), a septum (93), a packing (94) and an anti-extrusion ring (95) arranged from bottom to top between the valve cover (3) and the valve stem (10) for sealing, as well as a pressure plate (97) for pressing the bottom gasket (92), the septum (93), the packing (94) and the anti-extrusion ring (95) between the valve cover (3) and the valve stem (10).

6. A pilot-operated atmospheric relief valve according to claim 1, characterized in that: The pilot valve core (7) includes a main valve core (71) slidably connected to the sleeve (9), a pilot valve core (72) connected to one end of the valve stem (10) and located inside the main valve core (71), and a number of springs (73) disposed between the main valve core (71) and the pilot valve core (72). The main valve core (71) and the pilot valve core (72) are provided with medium channels (74).

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