CN214946555U - Hard sealing ball valve with middle cavity pressure relief function - Google Patents
Hard sealing ball valve with middle cavity pressure relief function Download PDFInfo
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- CN214946555U CN214946555U CN202121383170.4U CN202121383170U CN214946555U CN 214946555 U CN214946555 U CN 214946555U CN 202121383170 U CN202121383170 U CN 202121383170U CN 214946555 U CN214946555 U CN 214946555U
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Abstract
The utility model relates to a hard sealing ball valve with middle cavity pressure relief function, which comprises a valve body, a valve seat, a ball body, a valve rod and a transmission device, wherein the valve body consists of a left valve body, a middle valve body and a right valve body, the valve seat is made of hard alloy, a fixed seal is embedded in a valve cavity at the inlet and outlet passage of the valve body, and a sealing surface and the ball body are mutually ground to form a double metal sealing pair; the method is characterized in that: a one-way pressure relief valve is arranged between the valve cavity and the inlet channel of the valve body, the inlet of the one-way pressure relief valve is communicated with the valve cavity, and the outlet of the one-way pressure relief valve is communicated with the inlet channel of the valve body; the one-way pressure relief valve consists of a one-way valve body and a valve core, wherein the one-way valve body is provided with an inlet joint and an outlet joint, the inlet joint is communicated with the valve cavity, and the outlet joint is communicated with an inlet channel of the valve body; when the gas in the valve cavity generates abnormal high pressure due to temperature change, the one-way pressure release valve is automatically opened to release the pressure in the valve cavity to the inlet channel of the valve body, so that the valve body is prevented from explosion accidents, and the safety performance is good.
Description
Technical Field
The utility model belongs to the valve field especially relates to a hard seal ball valve.
Background
The ball valve is widely used in the control valve of gas medium conveying pipelines for power station desulfurization, exhaust and the like due to simple structure and convenient opening and closing, and the structure of the ball valve comprises a valve body, a valve seat, a ball body, a valve rod and a transmission device, wherein the valve seat is arranged in an inlet and outlet channel of the valve body and forms an inlet side double sealing pair and an outlet side heavy sealing pair with the ball body, and in order to improve the wear resistance, the valve seat and the ball body adopt hard alloy to mutually cooperate to form a hard sealing pair. The main disadvantages are: in a closed state, when the temperature of gas fully stored in the valve cavity rises, the gas expands at high temperature to generate abnormal high pressure, so that safety accidents such as valve body explosion and the like are caused.
Disclosure of Invention
The utility model discloses shortcoming to prior art exists provides one kind and can release the abnormal high pressure of valve pocket automatically, prevents that the valve body superpressure from bursting, the hard seal ball valve that has middle chamber pressure release function that the security performance is good.
The technical scheme of the utility model comprises a valve body, a valve seat, a ball body, a valve rod and a transmission device, wherein the valve body comprises a left valve body, a middle valve body and a right valve body, the valve seat is made of hard alloy, a fixed seal is embedded in a valve cavity at the inlet and outlet passage of the valve body, and a sealing surface and the ball body are mutually ground to form a double metal seal pair; the method is characterized in that: a one-way pressure relief valve is arranged between the valve cavity and the inlet channel of the valve body, the inlet of the one-way pressure relief valve is communicated with the valve cavity, and the outlet of the one-way pressure relief valve is communicated with the inlet channel of the valve body; the one-way pressure relief valve consists of a one-way valve body and a valve core, wherein the one-way valve body is provided with an inlet joint and an outlet joint, the inlet joint is communicated with the valve cavity, and the outlet joint is communicated with an inlet channel of the valve body; the valve core is an umbrella-shaped rubber valve core and is arranged in a cylindrical valve cavity between the inlet joint and the outlet joint, one end of an umbrella-shaped plane of the umbrella-shaped rubber valve core is arranged towards the outlet joint, and the outer conical surface of the other end of the umbrella-shaped rubber valve core is provided with a radial step which is matched with a radial inner step in the cylindrical valve cavity on one side of the inlet joint to form a one-way circulation sealing pair; the umbrella-shaped plane of the umbrella-shaped rubber valve core is provided with a circular groove, and a cylindrical valve cavity at one side of the outlet connector is internally provided with a limiting cylinder which is matched with the circular plane at the inner side of the circular groove.
In the technical scheme, a guide rod is arranged between the umbrella-shaped rubber valve core and the inlet channel of the one-way valve body.
In the technical scheme, a middle cavity composite sealing device is arranged between a middle valve body and a valve rod and consists of a sealing seat and a filler, the sealing seat is fixedly installed in a shaft hole of the middle valve body, the lower end face of the sealing seat is pressed on an inner step of the shaft hole of the middle valve body and a radial outer step of the valve rod, a sealing ring is arranged between the outer circular surface of the sealing seat and the shaft hole of the middle valve body, the inner hole wall of the sealing seat is in dynamic sealing fit with the outer circular surface of the valve rod, and two O-shaped sealing rings are arranged on the inner hole wall of the sealing seat; an annular sealing cavity is formed between the upper end of the shaft hole of the sealing seat and the outer circular surface of the valve rod, and the packing is sealed and pressed in the annular sealing cavity by a gland.
In the technical scheme, a composite sleeve is arranged between the lower part of the step in the shaft hole of the middle valve body and the second radial outer step of the valve rod.
The utility model discloses beneficial effect compared with prior art sets up one-way relief valve between valve pocket and valve body inlet channel, and when the gaseous unusual high pressure that produces because of temperature variation in the valve pocket, automatically open one-way relief valve, release valve pocket internal pressure to valve body inlet channel, prevent the valve body accident of exploding, the security performance is good.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the one-way relief valve in fig. 1 according to the present invention.
In the figure: the valve comprises a right valve body 1, a middle valve body 2, a positioning shaft 3, a left valve body 4, a ball 5, a valve seat 6, a valve rod 7, a composite sleeve 8, a sealing seat 9, a transmission device 10, a gland 11, packing 12, a one-way pressure release valve 13, a one-way valve body 14, a valve core 15, an inlet joint 16, an outlet joint 17 and a limiting cylinder 18.
Detailed Description
As shown in fig. 1, the hard seal ball valve with the middle cavity pressure relief function comprises a valve body, a valve seat 6, a ball body 5, a valve rod 7 and a transmission device 10, wherein the valve body consists of a left valve body 4, a middle valve body 2 and a right valve body 1, the lower end of the valve rod 7 is connected with the upper end of the ball body 5, the upper end of the valve rod passes through a shaft hole of the middle valve body 2 and is connected with a rotating shaft of the transmission device 10 fixedly installed on a support, the lower end of the ball body 5 is fixedly installed on the middle valve body 2 through a positioning shaft 3, the valve seat 6 adopts a hard alloy sealing ring, the valve seat is fixedly and hermetically installed in a valve cavity at an inlet and outlet channel of the valve body, a sealing surface of the valve seat and the ball body 5 are ground to form a double metal sealing pair matched with each other, the hard seal ball valve is suitable for abrasive gas media with dust and particles, and the valve seat 6 is installed in channels of the left valve body 4 and the right valve body 1 by welding; the method is characterized in that: a one-way pressure relief valve 13 is arranged between the valve cavity and the inlet channel of the valve body, the inlet of the one-way pressure relief valve 13 is communicated with the valve cavity, the outlet of the one-way pressure relief valve 13 is communicated with the inlet channel of the valve body, when the gas in the valve cavity generates abnormal high pressure due to temperature change in the closed state, the high-pressure gas in the valve cavity is automatically released to the inlet channel of the valve body through the one-way pressure relief valve 13, and the valve body is prevented from bursting; the one-way pressure relief valve 13 consists of a one-way valve body 14 and a valve core 15, the one-way valve body 14 is provided with an inlet joint 16 and an outlet joint 17, the inlet joint 16 is communicated with a valve cavity of the valve body, and the outlet joint 17 is communicated with an inlet channel of the valve body; the valve core 15 is an umbrella-shaped rubber valve core and is arranged in a cylindrical valve cavity between the inlet joint 16 and the outlet joint 17, one end of an umbrella-shaped plane of the umbrella-shaped rubber valve core is arranged towards the direction of the outlet joint 17, and the outer conical surface of the other end is provided with a radial step which is matched with a radial inner step in the cylindrical valve cavity at one side of the inlet joint 16 to form a one-way circulation sealing pair; a circular groove is arranged in the umbrella-shaped plane of the umbrella-shaped rubber valve core, when the pressure of the valve cavity is greater than the pressure of the inlet channel of the valve body, the outer conical surface of the umbrella-shaped rubber valve core is compressed and radially contracted, a medium is discharged to the inlet channel of the valve body from the space between the outer conical surface of the umbrella-shaped rubber valve core and the inner wall of the cylindrical valve cavity of the one-way valve body 14, when the pressure of the inlet channel of the valve body is greater than the pressure of the valve cavity, the medium pressure in the circular groove of the umbrella-shaped rubber valve core radially props up the umbrella-shaped rubber valve core to enable the outer conical surface of the umbrella-shaped rubber valve core and the inner wall of the cylindrical valve cavity of the one-way valve body 14 to be tightly sealed, meanwhile, the radial step of the outer conical surface of the umbrella-shaped rubber valve core and the radial inner step in the cylindrical valve cavity are tightly sealed to form a double sealing structure, the medium of the inlet channel of the valve body is prevented from entering the valve cavity, a limiting cylinder 18 matched with the circular groove is arranged in the cylindrical valve cavity at one side of the outlet joint 17, the movement distance of the umbrella-shaped rubber valve core pushed by the pressure of the valve cavity is limited, so that the outer conical surface of the umbrella-shaped rubber valve core is reliably compressed and contracted, as shown in fig. 2.
A guide rod is arranged between the umbrella-shaped rubber valve core and the inlet channel of the one-way valve body 14, and the guide rod and the umbrella-shaped rubber valve core are integrally manufactured, so that the umbrella-shaped rubber valve core is prevented from radially swinging, and the movement stability of the umbrella-shaped rubber valve core is improved.
A middle cavity composite sealing device is arranged between the middle valve body 2 and the valve rod 7 and consists of a sealing seat 9 and a filler 12, the sealing seat 9 is fixedly arranged in a shaft hole of the middle valve body 2, the lower end surface of the sealing seat is pressed on a step in the shaft hole of the middle valve body 2 and a step outside the radial direction of the valve rod 7 to prevent the valve rod 7 from being knocked out by medium pressure, a sealing ring is arranged between the outer circular surface of the sealing seat 9 and the shaft hole of the middle valve body 2, the inner hole wall of the sealing seat 9 is in dynamic sealing fit with the outer circular surface of the valve rod 7, and two O-shaped sealing rings are arranged on the inner hole wall of the sealing seat 9 to form a hard and soft double sealing structure between the valve rod 7 and the sealing seat 9; an annular sealing cavity is formed between the upper end of the shaft hole of the sealing seat 9 and the outer circular surface of the valve rod 7, and the packing 12 is hermetically pressed in the annular sealing cavity through the gland 11 to form a third sealing structure of the middle cavity.
And a composite sleeve 8 is arranged between the lower part of the inner step of the shaft hole of the middle valve body 2 and the second radial outer step of the valve rod 7, so that the rotating friction force of the valve rod 7 is reduced, and the anti-knock-out capability of the valve rod 7 is improved.
Claims (4)
1. A hard seal ball valve with a middle cavity pressure relief function comprises a valve body, a valve seat (6), a ball body (5), a valve rod (7) and a transmission device (10), wherein the valve body consists of a left valve body (4), a middle valve body (2) and a right valve body (1), the valve seat (6) is a hard alloy seal ring, the hard alloy seal ring is fixedly and hermetically arranged in a valve cavity at an inlet and outlet channel of the valve body, and a sealing surface of the hard seal ball valve and the ball body (5) are ground to form a double metal seal pair which is matched with each other; the method is characterized in that: a one-way pressure relief valve (13) is arranged between the valve cavity and the inlet channel of the valve body, the inlet of the one-way pressure relief valve (13) is communicated with the valve cavity, and the outlet of the one-way pressure relief valve is communicated with the inlet channel of the valve body; the one-way pressure relief valve (13) consists of a one-way valve body (14) and a valve core (15), the one-way valve body (14) is provided with an inlet joint (16) and an outlet joint (17), the inlet joint (16) is communicated with a valve cavity of the valve body, and the outlet joint (17) is communicated with an inlet channel of the valve body; the valve core (15) is an umbrella-shaped rubber valve core and is arranged in a cylindrical valve cavity between the inlet joint (16) and the outlet joint (17), one end of an umbrella-shaped plane of the umbrella-shaped rubber valve core is arranged towards the outlet joint (17), and the outer conical surface of the other end is provided with a radial step which is matched with a radial inner step in the cylindrical valve cavity at one side of the inlet joint (16) to form a one-way circulation sealing pair; a circular groove is arranged in the umbrella-shaped plane of the umbrella-shaped rubber valve core, and a limiting cylinder (18) which is matched with the circular plane at the inner side of the circular groove is arranged in the cylindrical valve cavity at one side of the outlet joint (17).
2. The hard seal ball valve with the middle cavity pressure relief function as claimed in claim 1, wherein: a guide rod is arranged between the umbrella-shaped rubber valve core and the inlet channel of the one-way valve body (14).
3. The hard seal ball valve with the middle cavity pressure relief function according to claim 1 or 2, characterized in that: a middle cavity composite sealing device is arranged between the middle valve body (2) and the valve rod (7), the middle cavity composite sealing device consists of a sealing seat (9) and a filler (12), the sealing seat (9) is fixedly arranged in a shaft hole of the middle valve body (2), the lower end surface of the sealing seat is pressed on a step in the shaft hole of the middle valve body (2) and a step outside the radial direction of the valve rod (7), a sealing ring is arranged between the outer circular surface of the sealing seat (9) and the shaft hole of the middle valve body (2), the inner hole wall of the sealing seat (9) is in dynamic sealing fit with the outer circular surface of the valve rod (7), and two O-shaped sealing rings are arranged on the inner hole wall of the sealing seat (9); an annular sealing cavity is arranged between the upper end of the shaft hole of the sealing seat (9) and the outer circular surface of the valve rod (7), and the packing (12) is pressed in the annular sealing cavity in a sealing mode through a gland (11).
4. The hard seal ball valve with the middle cavity pressure relief function as claimed in claim 3, wherein: a composite sleeve (8) is arranged between the lower part of the inner step of the shaft hole of the middle valve body (2) and the second radial outer step of the valve rod (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121383170.4U CN214946555U (en) | 2021-06-22 | 2021-06-22 | Hard sealing ball valve with middle cavity pressure relief function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121383170.4U CN214946555U (en) | 2021-06-22 | 2021-06-22 | Hard sealing ball valve with middle cavity pressure relief function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214946555U true CN214946555U (en) | 2021-11-30 |
Family
ID=79049253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121383170.4U Active CN214946555U (en) | 2021-06-22 | 2021-06-22 | Hard sealing ball valve with middle cavity pressure relief function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214946555U (en) |
-
2021
- 2021-06-22 CN CN202121383170.4U patent/CN214946555U/en active Active
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