A double-seat check valve
By employing a dual-seat structure and a flexible seat design, the problem of poor sealing in traditional check valves under high and low pressure conditions is solved, achieving zero-leakage sealing under different pressures and improving the sealing performance of the check valve.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN HBC VALVE
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional check valves cannot achieve zero leakage sealing under both high and low pressure conditions. The sealing surface force is insufficient under low pressure conditions, and the sealing surface is prone to deformation under high pressure conditions, leading to leakage.
It adopts a dual-seat structure, with the elastic seat designed as a cone shape and the hard sealing surface made of hard alloy welded together. The elastic seat is fixed to the valve disc assembly. Under low pressure, it forms an elastic soft seal, and under high pressure, the elastic deformation increases the contact of the hard seal, thus achieving sealing across the entire pressure range.
It can achieve zero leakage sealing under both high and low pressure conditions, improving the sealing performance of the valve and avoiding the high pressure load problem caused by the reduction of the sealing surface width.
Smart Images
Figure CN224453801U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a double-seat check valve, which can simultaneously meet the zero-leakage sealing requirements of check valves under both high-pressure and low-pressure conditions, thereby improving product performance. Background Technology
[0002] Currently, traditional check valves used in industries such as nuclear power, electric power, petrochemicals, and metallurgy can achieve good sealing performance under high operating pressure conditions when the system is running. However, under low operating pressure conditions, the force acting on the back of the valve disc is insufficient to provide the force required for the metal hard sealing surface to achieve a sealing effect. Therefore, check valves have a higher leakage rate under low-pressure conditions.
[0003] To achieve effective sealing under low-pressure conditions, the width of the sealing surface is typically reduced to improve sealing performance. However, under normal high-pressure operating conditions, the sealing surface is subjected to higher loads, which can easily cause deformation and lead to valve leakage.
[0004] In summary, there is an urgent need for a check valve that can simultaneously meet the zero-leakage sealing requirements under both high-pressure and low-pressure conditions. Summary of the Invention
[0005] This invention provides a double-seat check valve that can simultaneously meet the zero-leakage sealing requirements under both high-pressure and low-pressure conditions, thereby improving product performance. The technical solution of this utility model is as follows: It is composed of a valve body, valve seat, valve disc, valve cover, spring, elastic valve seat, deformation groove, fixing plate, screws, and other components. Its features are: after the valve disc and elastic valve seat are installed, they are fixed with a fixing plate and screws to form a valve disc assembly; the elastic valve seat adopts a conical design, with a small head and a large tail, ensuring it will not fall off after installation; both the valve seat and valve disc are overlaid with hard alloy to form a hard sealing surface; the elastic valve seat is slightly higher than the hard sealing surface of the valve disc. When the valve is closed, the head of the elastic valve seat first contacts the hard sealing surface of the valve seat, forming an elastic soft seal. The elastic valve seat is made of elastic rubber material, which can deform even under low pressure, satisfying good sealing performance under low-pressure conditions; when applied to high-pressure conditions, the elastic valve seat will be further compressed, and the deformation groove at the tail of the elastic valve seat allows sufficient deformation, thereby enabling the hard sealing surface of the valve disc to contact the hard sealing surface of the valve seat, achieving a good sealing effect.
[0006] Technical features: Simple structure, easy installation, can meet the zero-leakage sealing requirements under both high-pressure and low-pressure conditions, without reducing the width of the hard seal surface, effectively improving product performance. Attached Figure Description
[0007] The present invention will be further described below with reference to the accompanying drawings and examples.
[0008] Figure 1 This is a schematic diagram of a double-seat check valve. In the diagram: 1. Valve body, 2. Valve seat, 3. Valve disc assembly, 4. Spring, 5. Valve cover.
[0009] Figure 2 This is a schematic diagram of the valve disc assembly. In the diagram: 6. Valve disc, 7. Resilient valve seat, 8. Fixing plate, 9. Screw.
[0010] Figure 3 This is a schematic diagram of the sealing surface under low-pressure conditions. In the diagram, 10 is the hard sealing surface of the valve seat, 11 is the hard sealing surface of the valve disc, and 12 is the deformation groove.
[0011] Figure 4 This is a schematic diagram of the sealing surface under high-pressure conditions. Detailed Implementation
[0012] exist Figure 1 In the illustrated embodiment, the valve body (1) and valve cover (5) are connected by bolts to compress the spring (4). The spring force after the spring (4) is compressed is used to assist the sealing of the valve seat (2) and valve disc assembly (3). The valve body (1) and valve seat (2) are connected by welding. The valve seat (2) is overlaid with hard alloy to form a valve seat hard sealing surface (10). The valve disc (6) and elastic valve seat (7) are pressed together by fixing plate (8) and screws (9) to form valve disc assembly (3). The valve disc (6) is overlaid with hard alloy to form a valve disc hard sealing surface (11). The elastic valve seat (7) is slightly higher than the hard sealing surface (11) of the valve disc. When the valve is closed, the elastic valve seat (7) first contacts the hard sealing surface (10) of the valve seat to form an elastic soft seal, which can achieve a good sealing effect under low pressure conditions. When applied to high pressure conditions, the elastic valve seat (7) will be further compressed. The deformation groove (12) at the tail of the elastic valve seat allows the elastic valve seat to generate sufficient deformation, so that the hard sealing surface (11) of the valve disc contacts the hard sealing surface (10) of the valve seat to achieve a good sealing effect.
Claims
1. A double valve seat structure check valve, comprising a valve body, a valve seat, a valve disc, a valve cover, a spring, an elastic valve seat, a deformation groove, a fixed plate, a screw; characterized in that: After installation, the valve disc and resilient valve seat are secured with a fixing plate and screws, forming the valve disc assembly. The resilient valve seat features a tapered design with a small head and a large tail, ensuring it will not detach after installation. Both the valve seat and valve disc are overlaid with hard alloy to form a hard sealing surface. The resilient valve seat is slightly higher than the valve disc's hard sealing surface. When the valve is closed, the resilient valve seat first contacts the valve seat's hard sealing surface, forming an elastic soft seal. The resilient valve seat is made of elastic rubber material, which deforms under low pressure to achieve good sealing performance under low-pressure conditions. When applied to high-pressure conditions, the resilient valve seat is further compressed. The deformation groove at the tail of the resilient valve seat allows for sufficient deformation, enabling the valve disc's hard sealing surface to contact the valve seat's hard sealing surface, achieving a good sealing effect.