Importance

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Abstract

This invention represents an improvement in a gas pressure regulator of the type comprising a body having an inlet, an outlet, a gas flow passage in the regulator body interconnecting the inlet and outlet, and a regulator mechanism in the valve body including a relief valve which is set to open when the pressure of the gas in the flow passage exceeds a predetermined pressure. The improvement comprises a valve seat in the gas flow passage immediately upstream from the outlet in the body of the regulator, and a check valve member in the gas flow passage disposed between the valve seat and the outlet in the body of the regulator, the check valve member being movable between an open position in which it is spaced from the valve seat to permit flow in downstream direction from the inlet to the outlet past the valve seat, and a closed position in which the check valve member prevents reverse flow in upstream direction past the valve seat. In the event gas is introduced into a downstream line to test the downstream gas line and its connection to the outlet of the regulator body, the check valve member closes to prevent opening of the relief valve even if the pressure of the gas introduced into the downstream line for testing is greater than the pressure at which the relief valve in the regulator is set to open.

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First Claim