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 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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