the safety valve structures
The Safety valve structure includes a casing defining an axially extending cylinder having a piston reciprocable therein. A flow passage intersects and traverses the cylinder, and a valve element carried by the piston so as to be movable therewith is adapted to open and close the flow passage so as to control the movement of air therethrough. The piston is spring biased toward an inactive position in which the valve element is in its closed position; and a channel provided by the valve element permits a controlled minimum-flow of air therepast to the downstream side of the flow passage whenever the valve element is closed. A passageway interconnecting the downstream end portion of the flow passage and an end portion of the cylinder is adapted to permit the development of a pressure within the cylinder space effective to displace the piston against the biasing force of the spring into its active position in which the valve element is opened. Any sharp reduction in pressure in the downstream end portion of the flow passage enables the spring to return the piston and valve element to their inactive and closed positions, respectively.
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