How much is a pneumatic double eccentric butterfly valve and an electric ball valve? The inspection of valve body is also the key point of the inspection of pneumatic butterfly valve. The main inspection is to check whether the appearance of the main body is kept in a new state and whether there is gas leakage in the flange installed on the main body. If there is more time, the sealing condition of the valve body can be further checked and whether there is large wear loss on the surface. Finally, the condition of the valve surface needs to be checked, Check whether the valve plate operates flexibly,
、 The valve seat is an inclined conical elliptical sealing surface, which forms a sealing pair with a regular circular elastic sealing ring embedded on the butterfly plate. The sealing ring can float in the inner diameter of the butterfly plate groove. When the valve is closed, the elastic sealing ring first contacts the short axis of the elliptical sealing surface, and gradually pushes the sealing ring inward with the rotation of the plunger valve stem, forcing the elastic ring to contact the long axis of the inclined cone surface again, eventually leading to the full contact between the elastic sealing ring and the elliptical sealing surface. Its sealing is achieved by deformation of the elastic ring. Therefore, when the valve body or butterfly plate is deformed at low temperature, it will be absorbed and compensated by the elastic seal ring, without leakage and seizure. When the valve is opened, the elastic deformation disappears immediately, and there is basically no relative friction during the opening and closing process, so the service life is long. 2) Leakage of valve: one is that when the valve and pipeline are connected by flange, the leakage is caused by the relaxation caused by the unsynchronized shrinkage between the connecting gasket, connecting bolts and connecting pieces at low temperature. Therefore, we changed the connection mode of valve body and pipeline from flange connection to welding structure to avoid low-temperature leakage.
Previous: Is the price of pneumatic balance regulating valve butterfly valve dn700 signal butterfly valve?
Next: How to install pneumatic multi blade round butterfly valve due to failure?
