An excess pressure relieving means is illustrated for use with fluid pressure reducing apparatus wherein fluid passes from a high pressure inlet chamber to a reduced pressure outlet chamber and includes a valve member having a relief port carried by a diaphragm which extends across the outlet chamber, Balance Valves a closure member carried by the diaphragm normally closing the fluid relief port, and an operator carried by the closure member engaging a stop which limits movement of the closure member but which permits further movement of the valve member producing a separation of the valve and closure members permitting excess fluid pressure to be dissipated through the relief port.  A safety device for fluid pressure reducing apparatus having a fluid pressure reducing valve,Gate Valves through which fluid passes from a high pressure inlet chamber to a reduced pressure outlet chamber, operable responsive to a predetermined reduced pressure simulating means carried in alignment with the fluid pressure reducing valve, API CAST STEEL VALVESand a diaphragm interposed between said reduced pressure outlet chamber and said predetermined reduced pressure simulating means including: a stop carried adjacent said pressure simulating means at a predetermined position on a side of said diaphragm opposite said fluid pressure reducing valve; a valve member carried by said diaphragm having a fluid relief port communicating with said reduced pressure outlet chamber; a closure member carried by said diaphragm normally in position closing said fluid relief port; an operator means carried adjacent said closure member in alignment therewith for actuating said fluid pressure reducing valve adjacent one end thereof responsive to said reduced pressure simulating means; a port extending longitudinally in said operator means; means sealing said port during such actuation of said fluid pressure reducing valve but which is opened by movement of said operator when pressure in said regulated pressure outlet chamber exceeds said simulated pressure; and said operator means being in spaced relation with said stop adjacent the other end thereof which engages said stop upon further movement of said operator restraining said closure member carried thereby against further movement when said diaphragm and said valve and closure members carried thereby are moved responsive to an excessive pressure in said reduced pressure outlet chamber but permitting further movement of said diaphragm and valve member carried thereby separating said valve member from said closure member; whereby said fluid relief port is opened permitting fluid to escape therethrough relieving excessive pressure in said reduced pressure outlet chamber.

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