Posted by: Premium machine --Valve testing

Wedge gate valve closure is a wedge-shaped pieces, using wedge-shaped secondary purpose is to improve the sealing load, so that the metal sealed wedge gate valve not only guarantees a high sealed medium pressure, but also to the low-medium pressure sealed. In this way, metal sealed wedge gate valve sealing of the reach of potential than ordinary metal seal valve parallel to the high, however, metal sealed wedge gate valve produced by the wedging effect of the import side sealing load is often insufficient to achieve the import side seal. Wedge Gate Valve have set up a body-oriented institutions, to prevent gate rotation in the open or closed, thus ensuring the sealing surface of the corresponding alignment, and to gate in the closed position does not meet until the friction is not with the valve seat, thus reducing the sealing surface wear and tear. The disadvantage is the wedge-type valve can not be like with a diversion valve hole, as can be set up parallel diversion holes, and also cause thermal expansion of stem sealing surface overload. and wedge gate valve sealing surface than the Parallel Gate Valve flow more easily mixed with solid particles carried by media. Compared with a parallel-type valve. Wedge Gate Valve used in electric drive unit is more complicated, because the electric drive unit is not limited itinerary, but the torque. Wedge Gate Valve must be large enough to close the torque to the valve closed, so that wedge gate valve seat to seal. In order to be able to open in full under pressure and allow the valve parts due to thermal expansion increases The open and close torque, drives must have a sufficient torque margin. Previous:Basics - valve test pressure