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ANSI Pressure Seal Self-tightening Sealing  High Pressure Wedge Gate ValvePressure Seal ValvesPressure seal construction is adopted for Valves for high pressure service, typically in excess of above 170 bars. 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. Specificati..