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Hydraulic-Pneumatic Interface Valves for Control Systems This hydraulic, three-way, two position, normally closed, 316 SS valve permits a low-pressure pneumatic signal to control a high-pressure-hydraulic signal. In this unique spool valve design, the usual pilot diaphragm is replaced by a piston. The use of a stainless steel piston and an O-ring or Teflon “cup” seal eliminates failures due to diaphragm leakage and incompatibility of diaphragm with process fluids. The high ratio of hydraulic power pressure to pilot control pressure insures safe operation and positive

ve control under all conditions. Pneumatic Pilot Section Fluid Air or hydraulic Operating pressure 50 PSI (3.4 BAR) controls 5,000 PSI (344.7 BAR) 100 PSI (6.9 BAR) controls 10,000 PSI (689.5 BAR) Maximum pressure 1,000 PSI (68.9 BAR) Proof pressure 1,500 PSI (103.4 BAR) Hydraulic Valve Section Fluid Hydraulic or diesel Operating pressure 6,000 PSI (413.7 BAR); | 10,000 PSI (689.5 BAR) Proof pressure 15,000 PSI (1034.2 BAR) Burst pressure 20,000 PSI (1379 BAR) Operating temperature -40° to 450°F (-40° to 230°C) Flow capacity +0.5 Cv (equivalent .224” diameter orifice) Flow 39 GPM at 5,000 PSI (149 LPM at 344.7 BAR) Internal/external leakage Zero Port connections 1/4" FNPT
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