Description

FULL WELDED BALL VALVE 1.Bow-out proof stem For the purpose of preventing the stem from flying off resulting in abnormal rising of the inner pressure of valve, shoulder is fixed at the lower part of the ***** addition, in order to prevent leakage resulting from burnout of packing set of the stem in a fire, thrust bearing is set at the contact position of the shoulder at lower part of the stem and valve ***** an inverse seal seat is formed which will prevent leakage and avoid accident. 2.Anti-fire safe design When the trunnion ball valve be used normally, its sealed by seat and ball surface, seat retainer sealed by O-ring and body, this is soft sealed and reliable sealing.When the seat and O-ring are burnt, the seat retainer and body will be sealed by expanded ***** act anti-fire safe purpose.