Triple eccentric metal hard seal butterfly working principle of pneumatic valve

triple eccentric metal hard seal butterfly pneumatic valve working principle: the typical pneumatic valve, three eccentricity metal seal butterfly in addition to the pneumatic valve stem and pneumatic valve plate, there are two eccentric, pneumatic valve plate and seat sealing surfaces appear inclined frustum of a cone shape ( This is the so-called triple eccentric third eccentric) 。 Pneumatic valve closing pneumatic valve plate because of the eccentric push, pneumatic valve plate and seat do not produce friction in the process of closing, pneumatic valve plate direct pressure on the pneumatic valve seat, thus ensures the service life of pneumatic valves; In addition, owing to the pneumatic valve sealing ring ( No matter in a pneumatic seat or pneumatic valve plate) Have certain elasticity, and elasticity of convex platform with elastic ring with a small amount of clearance between can make a slight displacement of elastic ring; By closing force in pneumatic valve is closed, the role of the elastomer seal can automatically move to stress the position of the uniform; Plus a small amount of elastic ring deformation, make the pneumatic sealing ring uniform stress in the seat, to achieve the best sealing state.
different eccentric structure adjustment of the pneumatic valve, pneumatic valve plate offset by the increase in the number, the thickness of the pneumatic valve plate is also increasing, the fluid flows through the triple eccentric butterfly pneumatic valve resistance increased; With the increase of number of eccentric butterfly pneumatic valve, pneumatic valve performance also has changed a lot. From four different structure adjustment of the pneumatic valve comparison we can see: triple eccentric butterfly pneumatic valve can produce larger pressure drop, can be used as regulating pneumatic valve; When the fluid flows through the pneumatic valve pressure drop increases with the increase of the number of eccentric; But compared with other non butterfly pneumatic valve, triple eccentric butterfly pneumatic valve pressure drop is relatively small. As the change of number of eccentric butterfly pneumatic valve, pneumatic valve seat sealing performance is also changed, triple eccentric butterfly pneumatic valve has excellent sealing performance. Eccentric number increase, pneumatic valve opening and closing the required torque is reduced, so the triple eccentric butterfly pneumatic valve opening and closing the required torque than other types of butterfly pneumatic valve is much smaller. , along with the change of the number of eccentric adjustment range of temperature and pressure levels pneumatic valve and the applicable temperature range will have larger changes, triple eccentric butterfly the scope of the application of the pneumatic valve temperature and pressure rating is unmatched by other type pneumatic valve adjustment.
triple eccentric butterfly pneumatic valve: the advantages of good cutting performance triple eccentric metal seal butterfly cut pneumatic valve, pneumatic valve using torque had excellent sealing performance, so the pneumatic valve seat reason someone called zero leakage of pneumatic valve. Medium containing solid particles or dirt of triple eccentric metal seal butterfly not significantly affect the cutting performance of pneumatic valve, because the pneumatic valve close to closing, the medium flow rate is very high, make the dirt to accumulate the pneumatic valve seat.