[chongzivalve0809]

The unique feature about the pressure seal gate valve bonnet is that the body - bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the gate valve body-bonnet joint.

[chongzivalve0809]

Lined Butterfly valves are relatively easy to maintain. The resilient seat is held in place by mechanical means, and neither bonding nor cementing is necessary, Because the seat is replaceable, the lined butterfly valve seat does not require lapping, grinding, or machine work.