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Valve Wikipedia

A valve is a device or natural object that regulates, directs, or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways.

What is the Function of Valve?

• • Ball valve:

    • • The ball valve is a common valve type, which is improved from the plug valve and replaces the plunger with a ball. The ball is provided with a through-the-hole, and the rotation of the ball can control the cooperation between the through-the-hole and the flow channel to adjust the opening and closing of the valve. The ball valve is used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be rotated 90 degrees and a small torque can be closed tightly. The valve seat can be made of suitable material according to the working conditions. It is widely used because of its good sealing performance, simple structure, and easy operation and maintenance.

• • Globe valve:

    • • It is called because its shape resembles a ball. It opens or closes the flow channel with the cooperation of the valve plate and the valve seat. It is often used for cutting off and throttling. The flow channel in the valve body is S-shaped, when the fluid passes through, the flow direction will be changed, which will increase the resistance and reduce the fluid pressure.

• • Gate valve:

    • • The valve stem is used to drive the gate to move in a straight line, and the gate is lifted to open or close the flow channel. When the gate is half-opened, the fluid impacting the gate will easily cause the valve seat to vibrate and be damaged, so it is not suitable for throttling use. It is only suitable for fully open or fully closed occasions.

• • Check valve:

    • • A check valve is also called a one-way valve. It is a valve that automatically opens and closes according to the pressure difference between the front and rear of the valve disc, allowing only a one-way flow of fluid. Under the action of fluid pressure in one direction, the valve flap opens to make the flow channel unblocked. Conversely, when the fluid pressure in the other direction acts, the valve flap is closed to prevent backflow.

• • Butterfly valve:

    • • The butterfly valve can adjust the opening and closing and flow rate by controlling the rotation angle of the valve plate. Butterfly valves can be divided into elastic seals and metal direct seals. The elastic seals use rubber rings to prevent leakage and have good low-pressure sealing, but the rubber rings have temperature and pressure limitations. Metal direct sealing is direct contact between metal surfaces and has a wide operating temperature range. Butterfly valves are suitable for installation on large-diameter pipes.

• • Plug valve:

    • • The plug valve is mainly composed of a valve body and a plug, and the faucet is a kind of plug valve.

How is the Valve Produced?

Valves can be produced in any desired diameter and from various materials. Valves can control all fluids, from gases to high-impact chemicals, steam, toxic gases, and radioactive materials. They can operate from very low temperatures to the highest temperatures, from vacuum pressures to hundreds of bar high-pressure conditions. The valve varies according to pipe diameters, system structure, and system pressure.