CN215763607U - Cascade valve clack type pressure reducing valve - Google Patents
Cascade valve clack type pressure reducing valve Download PDFInfo
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- CN215763607U CN215763607U CN202120573911.9U CN202120573911U CN215763607U CN 215763607 U CN215763607 U CN 215763607U CN 202120573911 U CN202120573911 U CN 202120573911U CN 215763607 U CN215763607 U CN 215763607U
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Abstract
The invention relates to a cascade valve clack type pressure reducing valve, belonging to valves for thermal generator sets. The cascade valve clack type pressure reducing valve consists of a valve body, a main valve core, a valve seat, a sleeve, a spring, a guide valve clack, a screw A, a valve rod, a valve cover, a gland, a screw B and the like. The valve body is connected with the valve cover through a screw B, and the valve cover compresses the valve seat through a sleeve; the spring and the pilot valve are placed in the upper cavity of the main valve core, and the gland is connected with the main valve core through a screw A; the valve rod is connected with the guide valve core through threads. The upper part of the pilot valve flap is provided with 4 communicating holes, the main valve core is provided with a pilot valve seat sealing surface and a valve seat hole, and after the pilot valve flap is opened, the main valve core is changed into a balanced structure. The main valve core is provided with three sections of cylinders, the diameter d1 of the outer circle of the upper cylinder is equal to the diameter d2 of the outer circle of the lower cylinder, in the process of opening and closing the valve, acting forces of media on the main valve core are balanced, the operating force of the valve is reduced, the thrust of an actuating mechanism required to be configured for the valve is small, and the valve acts smoothly.
Description
Technical Field
The invention relates to a cascade valve clack type pressure reducing valve, belonging to valves for thermal generator sets.
Background
The pressure reducing valve for the thermal generator set generally comprises an unbalanced valve core and a balanced valve core. When the unbalanced pressure reducing valve is closed, the sealing is tight, but the operating force is large in the valve movement process; the balanced type pressure reducing valve has a small operating force but has poor sealing performance in a valve closed state. The large-caliber high-pressure-difference pressure-reducing valve generally adopts a balanced valve core for reducing the operating force, has low leakage grade, can only reach ASME B16.104 IV grade at most, and cannot meet the use requirement of the working condition requiring tight sealing.
Disclosure of Invention
The invention aims to provide a cascade valve clack type pressure reducing valve which can achieve a good sealing effect and reduce the operating force in the opening and closing process of the valve.
The invention provides a cascade valve clack type pressure reducing valve, which comprises a valve body, a main valve core, a valve seat, a sleeve, a spring, a guide valve clack, a screw A, a valve rod, a valve cover, a gland, a screw B and the like. The valve body is connected with the valve cover through a screw B, and the valve cover compresses the valve seat through a sleeve; the spring and the pilot valve are arranged in the main valve core, and the gland is connected with the main valve core through a screw A; the valve rod is connected with the pilot valve clack through threads.
The upper part of the pilot valve flap is provided with 4 communicating holes for communicating the upper part with the lower part of the pilot valve flap, the lower end of the pilot valve flap is provided with a pilot valve flap sealing surface, and the pilot valve flap is provided with a threaded hole.
The main valve core is provided with an upper cavity and a lower cavity, and the middle part of the inner cavity of the main valve core is provided with a guide valve seat sealing surface which is matched with the guide valve flap sealing surface in size. The sealing surface is provided with a valve seat hole for communicating the upper cavity and the lower cavity of the main valve core, the same height of the sealing surface is provided with a drain hole, and the pilot valve flap discharges accumulated water in the upper cavity of the main valve core when closed.
The main valve core is provided with three sections of cylinders, the diameter of the outer circle of the upper cylinder is D1, the diameter of the outer circle of the lower cylinder is D2, the diameter of the outer circle of the middle cylinder is D, D is larger than D1 and D2, and D1 is equal to D2; the lower end of the middle cylinder is provided with a main valve core sealing surface, and the circumferential direction of the lower cylinder is provided with a throttling hole.
After the valve is opened, the pilot valve flap is in an open state, the upper cavity and the lower cavity of the main valve core are communicated, and medium pressures are the same and are all P2; and the main spool upper chamber outer diameter d1 is equal to the lower chamber outer diameter d 2. Thus, the upward and downward forces of the medium on the main spool cancel each other out. If D1 equals D, then D1 is greater than D2 and the main spool will be forced upward during valve closing, F, equal to 0.785 (D)2-d22) (P1-P2) increasing the valve closing force.
When the cascade valve clack type pressure reducing valve is closed, the sealing surface of the main valve core is in contact sealing with the valve seat, and after the valve rod drives the guide valve clack to compress the spring, the guide valve clack is in contact sealing with the sealing surface of the guide valve seat, so that zero leakage of the valve is realized. When the valve is opened, the valve rod drives the pilot valve flap to move upwards, the pilot valve flap is gradually opened, the upper cavity of the main valve core is communicated with the lower cavity, the main valve core is changed into a balanced structure, and the pressure of the upper cavity of the main valve core is the same as that of the lower cavity; when the guide valve clack rises to the gland, the valve rod drives the main valve core to move upwards, and the main valve core is gradually opened. In the closing process of the valve, the valve rod drives the guide valve clack, the guide valve clack pushes the main valve core to move downwards through the spring, and the main valve core is firstly contacted with the valve seat to be closed; after the main valve core is closed, the guide valve flap compresses the spring and contacts with the sealing surface of the guide valve seat, and the valve is completely closed.
The invention has the beneficial effects that: the main valve core is 3 cylinders with different outer diameters, the main valve core is provided with an upper cavity and a lower cavity, a guide valve clack, a spring and a drain hole are arranged in the upper cavity, and the drain hole can drain accumulated water in the upper cavity of the main valve core; the pilot valve flap is provided with a communicating hole and can communicate the upper cavity and the lower cavity of the main valve core after being opened, so that the main valve core becomes a balanced structure. Because the diameters of the outer circles of the upper cylinder and the lower cylinder of the main valve core are the same, unbalanced thrust cannot be generated on the main valve core by media in the closing process of the valve, the thrust of an actuating mechanism required to be configured by the valve is small, and the valve acts smoothly.
Drawings
FIG. 1 is a schematic structural view of a cascade valve flap type pressure reducing valve
FIG. 2 is a schematic view of the structure of the guide flap
FIG. 3 is a schematic view of the main spool structure
FIG. 4 is a schematic view of the media flow when the valve is open
In the figure, 1, a valve body, 2, a main valve core, 3, a valve seat, 4, a sleeve, 5, a spring, 6, a guide valve clack, 7, a screw A, 8, a valve rod, 9, a valve cover, 10, a gland and 11, a screw B
Detailed Description
In the embodiment shown in fig. 1, the invention provides a cascade valve flap type pressure reducing valve which comprises a valve body (1), a main valve core (2), a valve seat (3), a sleeve (4), a spring (5), a pilot valve flap (6), a screw A (7), a valve rod (8), a valve cover (9), a gland (10) and a screw B (11). The valve body (1) is connected with the valve cover (9) through a screw B (11), the valve cover (9) compresses the sleeve (4), and the sleeve (4) compresses the valve seat (3); a spring (5) and a pilot valve flap (6) are placed in an upper cavity of the main valve core (2), and a gland (10) is connected with the main valve core (2) through a screw A (7) to limit the stroke of the pilot valve flap (6); the valve rod (8) is connected with the pilot valve flap (6) through threads.
As shown in figure 2, the upper part of the pilot valve flap (6) is provided with 4 communicating holes for communicating the upper part and the lower part of the pilot valve flap (6), the lower end of the pilot valve flap (6) is provided with a sealing surface of the pilot valve flap, and the middle part of the pilot valve flap is provided with a threaded hole.
As shown in figure 3, the main valve core (2) is provided with an upper cavity and a lower cavity, and the middle part of the inner cavity is provided with a guide valve seat sealing surface which is matched with the guide valve flap sealing surface in size. The sealing surface is provided with a valve seat hole for communicating the upper cavity and the lower cavity of the main valve core (2), the same height of the sealing surface is provided with a drain hole d3, and accumulated water in the upper cavity of the main valve core (2) is drained when the pilot valve clack (6) is closed.
The main valve core (2) is provided with three sections of cylinders, the diameter of the outer circle of the upper cylinder is D1, the diameter of the outer circle of the middle cylinder is D, and the diameter of the outer circle of the lower cylinder is D2; the lower end of the middle cylinder is provided with a main valve core sealing surface, the lower cylinder is provided with a throttling hole in the circumferential direction, the outer circle diameter D of the middle cylinder is larger than D1 and D2, and D1 is equal to D2.
As shown in fig. 4, when the valve is opened, the pilot valve flap (6) is opened first, the upper cavity and the lower cavity of the main valve element (2) are communicated through the communication hole and the valve seat hole of the pilot valve flap (6), and the medium pressures of the upper cavity and the lower cavity of the main valve element (2) are the same and are both P2; when the valve is opened to be closed, because the diameter d1 of the outer circle of the upper cavity of the main valve element (2) is equal to the diameter d2 of the outer circle of the lower cavity, and the medium pressure is P2, the upward and downward acting forces of the medium on the main valve element (2) are mutually offset.
When the cascade valve clack type reducing valve is in a closed state, the sealing surface of the main valve core (2) is matched with the valve seat (3), and the pilot valve clack (6) is in contact sealing with the pilot valve seat, so that zero leakage of the valve is realized. When the valve is opened, the valve rod (8) drives the guide valve clack (6) to move upwards, the guide valve clack (6) is gradually opened, an upper cavity and a lower cavity of the main valve core (2) are communicated through a communication hole and a valve seat hole of the guide valve clack (6), the main valve core (2) becomes a balanced structure, and the pressure of the upper cavity and the lower cavity of the main valve core (2) is the same; when the guide valve clack (6) rises to the gland (10), the valve rod (8) drives the main valve core (2) to move upwards, and the main valve core (2) is gradually opened. In the closing process of the valve, the valve rod (8) drives the guide valve flap (6), the guide valve flap (6) pushes the main valve core (2) to move downwards through the spring (5), and the main valve core (2) is firstly contacted with the valve seat (3) to be closed; after the main valve core (3) is closed, the guide valve clack (6) compresses the spring (5) and then contacts with the sealing surface of the guide valve seat, and the valve is completely closed.
Claims (4)
1. A cascade flap pressure reducing valve, characterized by: the valve comprises a valve body (1), a main valve core (2), a valve seat (3), a sleeve (4), a spring (5), a pilot valve flap (6), a screw A (7), a valve rod (8), a valve cover (9), a gland (10) and a screw B (11); the valve body (1) is connected with the valve cover (9) through a screw B (11), the valve cover (9) compresses the valve seat (3) through the sleeve (4), the spring (5) and the pilot valve flap (6) are placed in the main valve core (2), and the gland (10) is connected with the main valve core (2) through a screw A (7).
2. A cascade flapper pressure reducing valve according to claim 1, wherein: the upper part of the guide valve clack (6) is provided with 4 communicating holes, and the lower part is provided with a guide valve clack sealing surface.
3. A cascade flapper pressure reducing valve according to claim 1, wherein: the inner cavity of the upper part of the main valve core (2) is provided with a guide valve seat sealing surface, and a drain hole d3 is arranged at the same height with the sealing surface.
4. A cascade flapper pressure reducing valve according to claim 1, wherein: the main valve core (2) is provided with three sections of cylinders, the diameter D1 of the outer circle of the upper cylinder is the same as the diameter D2 of the outer circle of the lower cylinder, and the diameter D of the outer circle of the middle cylinder is larger than D1 and D2; the lower end of the middle cylinder is provided with a main valve core sealing surface, and the lower cylinder is provided with a throttling hole in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120573911.9U CN215763607U (en) | 2021-03-17 | 2021-03-17 | Cascade valve clack type pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120573911.9U CN215763607U (en) | 2021-03-17 | 2021-03-17 | Cascade valve clack type pressure reducing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215763607U true CN215763607U (en) | 2022-02-08 |
Family
ID=80094113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120573911.9U Active CN215763607U (en) | 2021-03-17 | 2021-03-17 | Cascade valve clack type pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215763607U (en) |
-
2021
- 2021-03-17 CN CN202120573911.9U patent/CN215763607U/en active Active
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