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WHAT IS IT?
 This is a two position, three way, normally closed hydraulic solenoid valve rated at 3000 psi. It uses metal to metal poppet and seat design with a maximum leakage of 4.0 cc/min.
The solenoid assembly contains three redundant coils. The valve will function normally with any two coils in operation and under all conditions. Radio frequency noise suppression is provided by three sets of diodes.
This design is configured as a manifold face mount type. Plug-in or line mounting schemes are also available. The electrical connector engages its mate as the valve is installed on the manifold.
The coil assembly and diode set are vacuum potted and isolated from the fluid. All wetted surfaces in the valves are either stainless steel or nickel plated magnetic alloys. The design uses two mutually opposed seats and two trapped spherical balls, both made of 440 stainless steel. Static seals are compatible with MIL-H-83282 hydraulic oil.
The dry weight of the unit is 0.9 pounds. |
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HOW DOES IT WORK?
 Supply pressure at 3000 psi is introduced to the inlet port located at the end of the valve housing. In the de-energized mode, pressure is blocked and the cylinder port is connected to return. When energized, the return port is blocked and pressure is ported to the cylinder. The valve will flow 0.5 gpm (minimum) through either port with a nominal 200 psi differential across the valve under all conditions.
The three coil solenoid assembly is designed such that the valve will operate properly when any two of the three coils are energized at 10 VDC maximum at 70 degrees F stabilized ambient and fluid temperature. This de-rated voltage corresponds to the minimum operating voltage of the 13.4 VDC at 160 degrees F ambient and 275 degrees F fluid temperatures. The solenoid holding force will allow the valve to move to the de-energized position at no less than 0.5 VDC after the signal is removed from all three coils (drop-out voltage).
 The valve features differential flow areas between the supply and control parts and the control and return parts. This characteristic provides a greater flow capacity to return and uses differential pressure to operate the valve more quickly.
The maximum drop-out time for the solenoid valve is 5 milli-seconds with two or three coil simultaneous de-energizations. Drop-out time is defined as the elapsed time from start of voltage decay until the cylinder pressure drops to 250 psi above return pressure. |
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