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The Structure Of The Ball Valve
Nov 01, 2018

The seal is good, but the ball is subjected to the work medium load all passes to the export seal ring, therefore must consider whether the seal material can withstand the working load of the sphere medium, when subjected to the high pressure impact, the sphere may shift.

This structure is generally used for medium and low pressure ball valves. The sphere of the ball valve is fixed and does not produce movement after being pressed. Fixed ball valves are equipped with a floating valve seat, subject to media pressure, the valve seat to create movement, so that the sealing ring pressed on the ball to ensure the seal.

Usually in the upper and lower shaft with the ball bearing, operation torque is small, suitable for high-pressure and large-caliber valves.

In order to reduce the operating torque of the ball valve and increase the reliability of the seal, there has been an oil seal ball valve, both in the sealing surface pressure injection of special lubricants to form a layer of oil film, that is, enhance the sealing, but also reduce the operating torque, more suitable for high-pressure large-caliber ball valve.


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