The unique feature about the pressure seal 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 body-Bonnet joint.A pressure seal is a valve design concept that offers distinct advantages when compared to a conventional bolted body-to-bonnet sealing mechanism. It uses thevalve system pressure to provide sufficient forces against the valve body’s internal diameter (ID) and the bonnet surfaces.