Why has electric ball valve become an important actuator in industrial automation control system?
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2020-08-01
The electric ball valve is small in size, light in weight, large in thrust, strong in function, with built-in servo amplifier, convenient operation and high reliability. The ball valve and the actuator are directly connected. The built-in servo system does not need to be equipped with a servo amplifier. The input and output signal of 4-20mA and 220 VAC power supply can control the operation.
The electric ball valve has the advantages of simple connection, compact structure, stable and reliable action. The electric ball valve can cut off and circulate the medium in the transportation pipeline of petroleum, chemical, paper, metallurgy, sewage treatment, oil tank truck, etc.
Features of electric ball valve products:
(1) The fluid resistance is small, ball valve is one of the smallest in all kinds of valves, even the reduced ball valve, its fluid resistance is quite small.
(2) The thrust bearing can reduce the friction torque of the valve stem and make the valve stem operate stably and flexibly for a long time.
(3) The sealing performance of the valve seat is good, and the sealing ring made of polytetrafluoroethylene is easy to seal, and the sealing capacity of ball valve increases with the increase of medium pressure.
(4) The valve rod seal is reliable. Because the valve rod only rotates and does not move up and down, the packing seal of the valve rod is not easy to be damaged, and the sealing capacity increases with the increase of medium pressure.
(5) As PTFE and other materials have good self-lubricating property, the friction loss with the ball is small, and the service life of the ball valve is long.
(6) The bottom mounted valve stem and the convex step at the head of the valve stem can prevent the valve stem from ejecting out. If the valve rod seal is damaged due to fire, metal contact can be formed between the convex step and the valve body to ensure the valve stem seal.
