The following is a detailed introduction to the fixed ball valve:
1. Structure and working principle
Ball: The ball is fixed on the upper and lower bearings and cannot float freely. It is usually designed as an integrated whole with the valve stem.
Valve seat: The valve seat is usually made of elastic materials (such as PTFE, PEEK, etc.), installed inside the valve body, and forms a seal with the ball.
Valve stem: The valve stem is connected to an external operating mechanism (such as a handle, gearbox or actuator) to control the rotation of the ball.
Working principle: When the channel of the ball is aligned with the pipeline, the fluid can pass through; when the ball is rotated 90 degrees and the channel is perpendicular to the pipeline, the fluid is blocked.
2. Main features
High sealing: The sealing performance between the ball and the valve seat of the fixed ball valve is excellent, and it is suitable for high pressure and high temperature conditions.
Low operating torque: Since the ball is fixed on the bearing, the friction is small during operation, and it is easy to open and close.
Bidirectional sealing: The fixed ball valve is usually designed as a bidirectional seal, which is suitable for bidirectional flow conditions.
High pressure resistance: It is suitable for high pressure environments, and the ball will not be displaced due to the medium pressure.
Long life: stable structure, low wear and long service life.
3. Application areas
Oil and gas: used for fluid control in long-distance pipelines, storage tanks and refining plants.
Chemical industry: suitable for corrosive media, high temperature and high pressure conditions.
Power industry: used for boiler systems, steam pipes, etc.
Water treatment: suitable for high-pressure water supply and drainage systems.
Ship and marine engineering: used for the control of media such as seawater and oil products.
4. Advantages
Excellent high-pressure performance: suitable for high-pressure conditions, stable sealing performance.
Low flow resistance: full-bore design, small flow resistance, suitable for high flow conditions.
Easy to operate: due to the fixed ball, the operating torque is small, suitable for large-diameter valves.
Easy maintenance: modular design, easy to disassemble and maintain.
Bidirectional sealing: suitable for bidirectional flow conditions.
5. Disadvantages
Higher cost: compared with Floating Ball valves, fixed ball valves have more complex structures and higher manufacturing costs.
Large volume: due to the need for supporting structures, fixed ball valves are usually larger in volume than floating ball valves.
