Views: 0 Author: J-VALVES Publish Time: 2024-04-24 Origin: Site
I. Advantages of Traditional Sealing Design
(I) Rigid Gate and Flexible Gate
The gate of a wedge gate valve can be designed as a rigid gate or a flexible gate. The rigid gate has strong integrity and is suitable for high-pressure working conditions. The flexible gate, through the elastic groove in the middle, generates a small amount of deformation under the action of the medium pressure, further improving the sealing performance. This design can effectively compensate for machining deviations and ensure the close fit of the sealing surfaces.
(II) Self-sealing and Forced Sealing
The sealing methods of a wedge gate valve are divided into self-sealing and forced sealing. Self-sealing relies on the medium pressure to press the gate against the valve seat to achieve sealing. Forced sealing presses the gate tightly on the valve seat through external force (such as a handwheel or actuator), which is suitable for higher pressures and more stringent sealing requirements.
(III) Multi-stage Sealing Structure
In order to further improve the sealing performance, wedge gate valves usually adopt a multi-stage sealing structure. For example, at the valve stem, a combined seal of a stuffing box and an O-ring is used to ensure no leakage during the operation of the valve stem. This design not only improves the overall sealing performance of the valve but also extends its service life.
II. Optimization of Modern Technologies
(I) Material Upgrade
Modern wedge gate valves widely adopt high-performance materials, such as stainless steel and nickel-based alloys. These materials have higher strength and better corrosion resistance. The sealing surfaces of the valve seat and gate are usually fabricated by hard alloy surfacing technology to further improve wear resistance and anti-scuffing performance.
(II) Structural Optimization
Through modern design methods such as finite element analysis, the structural design of the gate valve is optimized to reduce stress concentration and improve the strength and durability of the valve. For example, the new wedge double gate valve adopts a spherical top center and an arc hinge structure, which can automatically adjust the angle of the sealing surface and avoid jamming and scuffing caused by temperature changes.
(III) Improvement of Machining Accuracy
High-precision processing technology ensures the flatness and smoothness of the sealing surface, reducing the possibility of medium penetration. Advanced CNC machining equipment and testing technologies enable the manufacturing accuracy of wedge gate valves to be higher and the sealing performance to be more reliable.
