A safety valve comprising a piston slidably engaged within a bore for a housing and having releasable retaining means holding the piston against the effect of pressurized fluid, and further means responsive to a precalculated change of pressure to release the retaining means and release the fluid.
A pressure relief valve trigger is formed by a diaphragm chamber communicating with fluid in a container being monitored by a pressure collapisible pin axially maintaining the diaphragm in the chamber in a given position. A flapper valve latch member released by movement of the diaphragm in response to collapse of the pin releases a flapper valve on the container to open in response to fluid pressure above a predetermined value biasing the diaphragm to a pin collapsed position.
4149555 - Gas-actuated valves - Owned by The United States of America as represented by the Secretary of the Navy (Washington, DC)
A plurality of gas actuated valves capable of high-speed action, great prure endurance and withstanding shock, vibration and a marine environment. A sliding member, closing the valves inlet ports, may be retained by a frangible flange. Electrically-initiated gas cartridges produce a rapid pressure rise causing the sliding member to be displaced thereby shearing the flange and allowing the sliding member to uncover the inlet ports for ambient fluid entry. A plurality of O-rings minimize functional sensitivity to external pressure and seal the valve against the entry of the ambient fluid.
