Views: 0 Author: Site Editor Publish Time: 2024-04-07 Origin: Site
The two main types of gate valves are wedge and parallel.
Parallel Slide Gate Valves work by controlling the flow of fluid by moving a flat gate plate vertically to a position in the middle of the fluid flow direction. This type of gate valve is relatively easy to operate because the friction between the gate and the valve seat is small when opening or closing. Plate gate valves are suitable for applications under high pressure or high temperature conditions, and can effectively cut off fluid flow.
Flexible gate valves have a curved gate plate, often referred to as a "wedge". This design allows the gate to adapt to changes in the valve seat to ensure better sealing performance. During operation, the curvature of the gate allows it to automatically adjust its contact surface with the valve seat, thus maintaining good sealing performance in situations where the fluid temperature or pressure varies greatly.
Both types of gate valves have a wide range of applications in industry and pipework, and the choice of gate valve type usually depends on the nature of the fluid, the pressure and temperature conditions, and the operational performance required.
Gate valves can be classified according to different criteria. Here are several common classification methods:
Flat Gate Valve: The gate is parallel to the axis of the flow channel, commonly used in smaller diameter pipelines.
Slant Gate Valve: The gate is inclined at around a 45-degree angle, suitable for larger diameter pipelines with good cutting performance.
Wedge Gate Valve: The gate is wedge-shaped and can be single or double wedged, often used in high-pressure and high-temperature applications.
Manual Gate Valve: Operated manually using a valve handwheel, lever, or similar device to raise and lower the gate.
Electric Gate Valve: Motor-driven to raise and lower the gate.
Pneumatic Gate Valve: Utilizes pneumatic actuators to raise and lower the gate.
Hydraulic Gate Valve: Utilizes hydraulic actuators to raise and lower the gate.
Metal-seated Gate Valve: The gate and seat are typically made of metal such as stainless steel, offering good high-temperature and wear-resistant properties.
Elastomer-seated Gate Valve: The gate and seat are made of rubber, PTFE, or similar elastomeric materials, providing excellent sealing suitable for corrosive media.
Standard Gate Valve: Used in general industrial pipeline systems for controlling conventional media.
High-Pressure Gate Valve: Designed for high-pressure pipeline systems, featuring excellent pressure resistance.
High-Temperature Gate Valve: Suitable for controlling high-temperature media, with good heat-resistant properties.
These are just some common classification methods for gate valves. In practice, gate valves can also be classified based on other factors such as material and connection type. When selecting a gate valve, it is important to consider actual process requirements, medium properties, and operating environments to choose the appropriate valve type and specifications.
