A pressure reducing valve has a plunger having an axial hole, which plunger is movable in a valve body between two extreme positions defined by stops and under the action of resilient means.Resilient Seated Gate Valves A stem valve is movable in the axial hole and is adapted to assume a stop position such that it closes the axial hole when the plunger is in a rest position and that it leaves the hole open when the plunger is in the other positions. Reducing ValvesA control aperture admits a control pressure to a reaction surface on the plunger in order to produce a regulable increase in the resistance offered by the resilient means to the movement of the plunger.GLOBE VALVE A pressure reducing valve comprising a hollow cylinder having an inlet port, an outlet port, an exhaust port and a control port; a plunger having two flanges at opposite ends of an intermediate reduced diameter portion an an axial bore extending through the flanges and the reduced diameter portion, said plunger being slidable in the hollow cylinder between a first position and a second position, one flange of the plunger defining an inlet chamber with the wall of said cylinder adjacent the inlet port and the opposite flange defining an outlet chamber with the wall of said cylinder adjacent the outlet and exhaust ports; said cylinder having an internal annular shoulder disposed between the flanges of said plunger, said shoulder having an annular groove facing the side of said one flange opposite said inlet chamber and means communicating said groove with the control port; resilient means disposed in said outlet chamber biasing said plunger to said first position where said opposite flange rests against said shoulder; a two-headed stem valve movably mounted in said axial bore of the plunger, spring means biasing one head of the stem valve into engagement with said exhaust port to close said exhaust port when said plunger is in said second position, the other head of said stem valve being arranged to cooperate with the axial bore in said one flange whereby said axial bore will be open when said plunger is disposed in said second position and whereby when said plunger is disposed in said first position, said one head of said stem valve will open said exhaust port and the other head of said stem valve will close said axial bore; said plunger being shiftable from said first position to said second position where said one flange rests against said shoulder when a pressure in said inlet chamber exerts a force on said plunger exceeding the combined force of the pressure in said control port, the pressure in said outlet chamber and the force of said resilient means.

MORE NEWS