2016年7月5日星期二

difference between floating and trunnion mounted ball valve

Difference between floating and trunnion mounted ball valve

Starting from the float is floating and floating ball valve is floating, it is this attitude, usually starting with a small-caliber float, so the large-diameter ball type should be floating instead of Q47 Q41F

Two kinds of layout is not the same ball, the ball valve also has a floating lower floating shaft, valve switching process, the ball is around the vertical axis transformation, the sky is not the lower part of the float valve shaft. 200 caliber usually less use from the float valve, 200 caliber above are floating ball.

First, since the floating ball valve
The ball valve is floating from under medium pressure effect, the ball can occur and must be pressed in the displacement of the sealing surface of the outlet end, the outlet end of the guarantee seal.
From the float valve layout simple, good sealing, but the ball accepting jobs medium load all pass the exit ring seal and thus need to think about whether the information is maintained suffered job load media sphere. This layout is widely used in the low-pressure valve.

Second, floating ball valve
The ball valve is floating, the move does not occur after compression. floating ball valve with both starting floating valve seat, by the media pressure, moving the seat occurs, the seal is pressed onto the ball, in order to guarantee the seal. Usually with the ball, the lower shaft with bearings, operating torque is small, suitable for high pressure and large diameter valve.

To cut valve operating torque level and add reliable seal these years and presents the valve seals, both pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the seal, but also reduce operating torque , more suitable for large diameter high pressure valve.

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