CN219510193U - Forced open check valve with back pressure - Google Patents
Forced open check valve with back pressure Download PDFInfo
- Publication number
- CN219510193U CN219510193U CN202320661999.9U CN202320661999U CN219510193U CN 219510193 U CN219510193 U CN 219510193U CN 202320661999 U CN202320661999 U CN 202320661999U CN 219510193 U CN219510193 U CN 219510193U
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- valve
- valve clack
- clack
- back pressure
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Abstract
The utility model relates to a forced open check valve with back pressure. The check valve comprises a valve body and a valve seat, wherein the valve seat is provided with a flow passage, a first valve clack is arranged in the valve body in a rotating mode, a medium channel is formed in the first valve clack, a shaft rod is arranged in the valve body in a rotating mode, the first valve clack is arranged on the shaft rod in a free rotating mode, a rocker is arranged on the shaft rod in a synchronous rotating mode, and a second valve clack is arranged on the rocker so as to realize forced opening and closing of the medium channel. The second valve clack is provided with a first sealing surface, and the first valve clack is provided with a second sealing surface in sealing fit with the first sealing surface. The valve body is provided with a driving mechanism for driving the shaft lever to rotate. The check valve with the structure can not only realize the requirement that the second valve clack is forcedly opened under the back pressure to enable downstream medium to flow into the upstream; and can also satisfy the normal forward operation of system, the medium is from the pipeline upstream to come over, and actuating mechanism drives the second valve clack and opens, and forward medium pressure can directly dash out first valve clack, opens the medium runner, reaches the requirement of normal operating.
Description
Technical Field
The utility model relates to the technical field of valves, in particular to a forced open check valve with back pressure.
Background
The check valve is an automatic valve which can automatically open and close the valve clack by means of the flowing of medium, and has the function of preventing the medium from flowing backwards. The check valve is also called a check valve, a one-way valve, a reverse flow valve and a back pressure valve, and has the main functions of preventing the medium from flowing backwards, preventing the reverse rotation of the pump and the driving motor, and preventing the medium in the container from leaking.
The check valve comprises a valve body, a valve seat and a valve clack, wherein the valve clack is rotatably arranged in the valve body through a shaft pin and only allows medium to flow in one direction to prevent reverse flow. The valve is automatically operated, and under the action of fluid pressure flowing in one direction, the valve clack is opened; when fluid flows in the opposite direction, the valve clack is closed by sealing the valve clack with the sealing surface of the valve seat by the pressure of the fluid and the dead weight of the valve clack, so that the aim of preventing the medium from flowing back is fulfilled.
The check valve with the structure is a common structure at present, but the check valve with the structure can only be used in common occasions, namely forward circulation and reverse check working conditions. In some occasions requiring multiple working conditions, the check valve with the conventional structure cannot be applied, for example, in the heating and ventilation field, the medium downstream of the check valve is required to flow into the upstream of the check valve, so that the medium of the operation unit warms turbine blades and the like of the shutdown unit, namely, the working conditions require that the valve clack is opened under the condition of back pressure so that the downstream medium flows into the upstream; the valve has the function of a common check valve, namely the working condition is required to be normal forward operation and reverse check. For the occasion under this special operating mode requirement, the check valve of ordinary structure can't be suitable.
Disclosure of Invention
The utility model aims to provide a back pressure forced open type check valve, which solves the problem that the prior check valve is limited in use because the check valve cannot be opened to allow downstream medium to flow into upstream medium when the upstream pressure of the check valve is lower than the downstream pressure, namely the back pressure is provided.
In order to achieve the above purpose, the back pressure forced open type check valve of the utility model adopts the following technical scheme: the utility model provides a take back pressure forced open check valve, includes valve body and disk seat, and the disk seat has the runner, and the inside rotation of valve body is provided with first valve clack, and first valve clack is used for realizing opening and closing of runner with the disk seat cooperation, set up the medium passageway on the first valve clack, the inside rotation of valve body is provided with the axostylus axostyle, and first valve clack freely rotates and installs on the axostylus axostyle in order to realize its can freely rotate, and synchronous rotation is provided with the rocker on the axostylus axostyle, is provided with the second valve clack that is used for with medium passageway complex on the rocker to realize opening and closing of medium passageway, is provided with first sealed face on the second valve clack, is provided with the second sealed face with first sealed face seal cooperation on the first valve clack; the valve body is provided with a driving mechanism which drives the shaft lever to rotate so as to drive the second valve clack to rotate to forcedly open the medium channel.
The shaft lever is connected with a valve rod through a jaw structure, the driving mechanism drives the shaft lever to rotate through the valve rod and the jaw structure, the jaw structure comprises a central groove arranged at the end part of the shaft lever, a mounting groove is formed in the groove wall of the central groove, the end part of the valve rod is provided with a loading part which is loaded into the central groove, and a force application protrusion which is loaded into the mounting groove and is used for being in contact with the groove wall of the mounting groove to transmit power is arranged on the loading part; the width of the force application protrusion is smaller than the groove width of the mounting groove, so that an idle stroke exists between the valve rod and the shaft rod in the rotation process, and the second valve clack can freely close the medium channel under the action of medium backflow thrust and/or self gravity.
The first valve clack is provided with a first limiting rib plate, and the first limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the first valve clack.
The second valve clack is provided with a second limiting rib plate, and the second limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the second valve clack.
The rocker is provided with a valve clack mounting hole, the second valve clack comprises a valve clack plate and a mounting column used for being mounted in the valve clack mounting hole, a mounting step is formed at the joint of the mounting column and the valve clack plate, an adjusting gasket is arranged on the mounting step, one side surface of the adjusting gasket is contacted with the step surface of the mounting step, the other side surface of the adjusting gasket is contacted with one end surface of the valve clack mounting hole, a valve clack cover is in limit fit on the other end surface of the valve clack mounting hole, and the valve clack cover is connected with the mounting column through a screw.
The valve clack mounting hole is the bell mouth, and the erection column is the cylinder for the second valve clack can realize sealing with first valve clack for the automatic alignment of valve clack mounting hole.
The first valve clack is provided with a balancing weight.
The first sealing surface and the second sealing surface are both sealing surfaces formed by hard metal overlaying.
The utility model has the beneficial effects that: when the back pressure exists at the downstream of the check valve in the pipeline and the valve is required to be forcedly opened, the shaft rod and the second valve clack on the shaft rod are rotated through the driving mechanism, the medium channel on the first valve clack is opened, the second valve clack is opened to enable the upstream and the downstream of the check valve to be communicated, and the medium flows into the upstream from the downstream of the check valve, so that the second valve clack is forcedly opened under the back pressure to be communicated with the upstream and the downstream of the check valve, and the requirement of opening the valve with the back pressure on site is met. When the system normally runs forward, the medium flows through the upstream of the pipeline, the driving mechanism can drive the second valve clack to open, the first valve clack can be directly punched by forward medium pressure, and the medium flow channel is opened, so that the requirement of normal running is met.
Drawings
FIG. 1 is a schematic illustration of the construction of one embodiment of the back pressure forced open check valve of the present utility model;
FIG. 2 is a schematic diagram of a second embodiment of the back pressure forced open check valve of the present utility model;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic view of the mounting structure between the second valve flap and the rocker;
fig. 5 is a schematic structural view of the first valve flap.
Detailed Description
The embodiment of the back pressure forced open type check valve comprises a valve body 1 and a valve seat 2, wherein the valve seat is provided with a flow passage, a first valve clack 4 is rotatably arranged in the valve body, and the first valve clack is used for being matched with the valve seat to realize the opening and closing of the flow passage. The medium channel 22 is arranged on the first valve clack, the shaft lever 3 is arranged in the valve body in a rotating way, the first valve clack 4 is arranged on the shaft lever in a free rotating way so as to realize free rotation, namely, the first valve clack can rotate relative to the shaft lever in a free way, and the first valve clack and the shaft lever do not interfere with each other. Specifically, as shown in fig. 5, the back surface of the first valve flap 4 is provided with a first mounting portion 21, on which a first mounting hole that is fitted over the shaft is provided. When the fluid medium flows positively, the first valve clack is pushed away by the acting force of the fluid medium, so that the purpose of normal operation is achieved, and when the field fails, the first valve clack can be automatically closed by means of gravity and the backflow thrust of the fluid medium.
The shaft lever is synchronously rotated and provided with a rocker 13, and the rocker is provided with a second valve clack 5 matched with the medium channel so as to realize the opening and closing of the medium channel. Specifically, as shown in fig. 4, the rocker includes a second mounting portion 19, a second mounting hole sleeved on the shaft rod is formed in the second mounting portion, a first key groove 20 is formed in the hole wall of the second mounting hole, a second key groove is formed in the shaft rod, and flat keys are mounted in the first key groove and the second key groove, so that the rocker can synchronously rotate along with the shaft rod.
The rocker 13 is provided with a valve clack mounting hole 14, the second valve clack comprises a valve clack plate and a mounting column 15 used for being mounted in the valve clack mounting hole, a mounting step 18 is formed at the joint of the mounting column and the valve clack plate, an adjusting gasket is arranged on the mounting step, one side surface of the adjusting gasket is contacted with the step surface of the mounting step, the other side surface of the adjusting gasket is contacted with one end surface of the valve clack mounting hole, a valve clack cover 16 is in limit fit on the other end surface of the valve clack mounting hole, and the valve clack cover is connected with the mounting column through a screw 17. And the thickness or the number of the adjusting gaskets is changed to adjust the complete sealing fit between the second valve clack and the second valve clack. The valve clack mounting hole 14 is the bell mouth, and the erection column 15 is the cylinder for the second valve clack can realize sealing with first valve clack for the valve clack mounting hole automatic alignment. The first valve clack is provided with a balancing weight 8. The balancing weight is used for enabling the first valve clack to be quickly closed when the fluid medium stops.
The second valve clack 5 is provided with a first sealing surface 12, and the first valve clack 4 is provided with a second sealing surface 11 in sealing fit with the first sealing surface. The first sealing surface and the second sealing surface are both sealing surfaces formed by hard metal overlaying welding, and the hard metal can be cobalt-chromium-tungsten alloy. The valve body is provided with a driving mechanism which drives the shaft lever to rotate so as to drive the second valve clack to rotate to forcedly open the medium channel. The driving mechanism can adopt a pneumatic actuating mechanism or a driving motor and can drive the shaft lever to rotate. The shaft lever is connected with a valve rod 7 through a jaw structure 6, and the driving mechanism drives the shaft lever to rotate through the valve rod and the jaw structure. Specifically, the jaw structure comprises a central groove arranged at the end part of the shaft rod, a mounting groove is arranged on the groove wall of the central groove, the end part of the valve rod is provided with a loading part which is loaded in the central groove, and a force application protrusion which is loaded in the mounting groove and is used for being in contact with the groove wall of the mounting groove to transmit power is arranged on the loading part. The width of the force application protrusion is smaller than the groove width of the mounting groove, so that an idle stroke exists between the valve rod and the shaft rod in the rotation process, and the second valve clack can freely close the medium channel under the action of medium backflow thrust and/or self gravity.
The first valve clack 4 is provided with a first limiting rib plate 10, and the first limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the first valve clack. The second valve clack 5 is provided with a second limiting rib plate 9, and the second limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the second valve clack. The opening angles of the first valve clack and the second valve clack are prevented from being too large, when the fluid medium flows backwards, the first valve clack and the second valve clack float on the fluid medium because the fluid medium flows backwards too fast, and the valve cannot be closed fast.
When back pressure exists at the downstream of the check valve in the pipeline and the valve needs to be forcedly opened, the shaft rod and the second valve clack on the shaft rod rotate through the driving mechanism, and the second valve clack opens a medium channel on the first valve clack, so that the upstream and the downstream of the check valve are communicated, a medium flows into the upstream from the downstream of the valve clack under the action of the back pressure, and the forced opening of the second valve clack under the back pressure is realized so as to be communicated with the upstream and the downstream of the check valve. When the system normally operates, the medium flows from the upstream of the pipeline, the driving mechanism can drive the second valve clack to open, the first valve clack is pushed open by the acting force of the fluid medium, and the system normally operates. When the system fails or needs to be shut down, the first valve clack and the second valve clack are quickly closed by means of dead weight and medium backflow thrust when power is lost and gas is lost, fluid medium backflow is prevented, and the driving mechanism plays an auxiliary closing role.
In other embodiments of the present utility model, when the first valve clack and the second valve clack are ensured to be closed smoothly, the first valve clack may not be provided with a first limiting rib plate, and the second valve clack may not be provided with a second limiting rib plate.
Claims (8)
1. The utility model provides a take back pressure forced open check valve, includes valve body and disk seat, and the disk seat has the runner, and the inside rotation of valve body is provided with first valve clack, and first valve clack is used for realizing opening and closing of runner, its characterized in that with the disk seat cooperation: the valve comprises a valve body, a rocker, a first valve clack, a second valve clack, a first sealing surface and a second sealing surface, wherein a medium channel is formed in the first valve clack; the valve body is provided with a driving mechanism which drives the shaft lever to rotate so as to drive the second valve clack to rotate to forcedly open the medium channel.
2. The back pressure forced open check valve according to claim 1, wherein: the shaft lever is connected with a valve rod through a jaw structure, the driving mechanism drives the shaft lever to rotate through the valve rod and the jaw structure, the jaw structure comprises a central groove arranged at the end part of the shaft lever, a mounting groove is formed in the groove wall of the central groove, the end part of the valve rod is provided with a loading part which is loaded into the central groove, and a force application protrusion which is loaded into the mounting groove and is used for being in contact with the groove wall of the mounting groove to transmit power is arranged on the loading part; the width of the force application protrusion is smaller than the groove width of the mounting groove, so that an idle stroke exists between the valve rod and the shaft rod in the rotation process, and the second valve clack can freely close the medium channel under the action of medium backflow thrust and/or self gravity.
3. The back pressure forced open check valve according to claim 1, wherein: the first valve clack is provided with a first limiting rib plate, and the first limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the first valve clack.
4. The back pressure forced open check valve of claim 3 wherein: the second valve clack is provided with a second limiting rib plate, and the second limiting rib plate is contacted with the inner wall of the valve body to limit the opening angle of the second valve clack.
5. The back pressure forced open check valve according to any of claims 1-4, wherein: the rocker is provided with a valve clack mounting hole, the second valve clack comprises a valve clack plate and a mounting column used for being mounted in the valve clack mounting hole, a mounting step is formed at the joint of the mounting column and the valve clack plate, an adjusting gasket is arranged on the mounting step, one side surface of the adjusting gasket is contacted with the step surface of the mounting step, the other side surface of the adjusting gasket is contacted with one end surface of the valve clack mounting hole, a valve clack cover is in limit fit on the other end surface of the valve clack mounting hole, and the valve clack cover is connected with the mounting column through a screw.
6. The back pressure forced open check valve according to claim 5, wherein: the valve clack mounting hole is the bell mouth, and the erection column is the cylinder for the second valve clack can realize sealing with first valve clack for the automatic alignment of valve clack mounting hole.
7. The back pressure forced open check valve according to claim 1, wherein: the first valve clack is provided with a balancing weight.
8. The back pressure forced open check valve according to claim 1, wherein: the first sealing surface and the second sealing surface are both sealing surfaces formed by hard metal overlaying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661999.9U CN219510193U (en) | 2023-03-29 | 2023-03-29 | Forced open check valve with back pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320661999.9U CN219510193U (en) | 2023-03-29 | 2023-03-29 | Forced open check valve with back pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219510193U true CN219510193U (en) | 2023-08-11 |
Family
ID=87524993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320661999.9U Active CN219510193U (en) | 2023-03-29 | 2023-03-29 | Forced open check valve with back pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219510193U (en) |
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2023
- 2023-03-29 CN CN202320661999.9U patent/CN219510193U/en active Active
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