Casting P.S.B Gate Valve

Casting P.S.B gate valve uses the pressure of the medium itself to achieve the purpose of sealing. The greater the pressure, the greater the sealing force generated, and the more reliable the seal. The outer diameter of the bonnet has a smooth tapered surface, and the tapered surface is closely attached to the self-tightening sealing ring, and the outer diameter of the sealing ring is closely attached to the valve body. The pressure self-sealing should have sufficient pre-tightening force to achieve sealing when the pressure inside the valve is not high. This preload can be produced by tightening the threads of the support gland, or it can be constructed with several bolts.