A safety pressure reducing regulator for use in systems operable by pressurized gas incorporates multiple safety features which preclude excessive pressure buildup in the system and provide protection against catastrophic failures.REDUCING VALVES The regulator includes primary and secondary regulator stages through which pressurized gas from a gas pressure source is supplied to a pressure control chamber which provides the operating pressure for the system. Gate ValvesThe primary regulator stage is designed to reduce the inlet gas pressure to an intermediate level. The secondary regulator stage is designed to automatically regulate the supply of the pressurized gas at the intermediate pressure to the pressure control chamber to maintain a desired operating pressure therein.Balance Valves A flexible diaphragm is normally disposed across the pressure control chamber which is adapted to function as a check valve to control communication between the secondary regulator stage and the pressure control chamber. A clamping piston provided with a central passage normally clamps the flexible diaphragm in place across the pressure control chamber. In the event of excess pressure buildup in the pressure control chamber, the piston unclamps the diaphragm which collapses into its central passage to permit the pressurized gas to escape through exhaust vents.

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