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The Pressure seal bonnet (PSB) gate valves provided by Weldon are adopted for high pressure service. Compared to Bolted Bonnet (BB) valve, which the body flange and bonnet flange are joined by studs and nuts, when the system pressure increases, the potential for leakage through the body/Bonnet joint also increases, the unique structure of the pressure seal Bonnet gate valves is that the body-Bonnet joints seals improves as the internal pressure in the gate valve increases, the higher the internal pressure, the greater the sealing force.

Weldon pressure seal gate valves are available in size ranges from 2 inches to 24 inches, and pressure classes from Class 600 to Class 2500 LB.

 
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