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WHAT IS IT?
 This is a two position, two way, normally closed solenoid valve rated at 325 psi. The valve poppet has an integral elastomeric pad which operates against the metal seat, with a maximum leakage of 5 cc/min. at 225 psi. The poppet is pressure assisted closed to aid in leakage reduction as pressure rises.
This valve's single coil has a nominal 75 ohms resistance and is designed for a 24 volt system. The valve will operate with a signal as low as 17 volts and accept signals as high as 30 volts. The coil is rated for continuous duty with ambient temperatures ranging from -65 degrees to 280 degrees F and fluid temperatures from -65 degrees to 210 degrees F. The valve construction utilizes all stainless steel structural parts. The bobbin/valve body assembly uses magnetic and non-magnetic stainless steels which are laser welded together, providing simplicity in construction. This economical approach results in a 4.8 oz. valve which has a flow capacity over 100 pph of JP-4 at 50 PSI, for example. The valve is built to aerospace quality standards.
The valve is available in a manifold or plug-in type. This configuration shows pigtail wires which may be inserted into a conduit for connection elsewhere in the assembly. The customer's selection for a connector may also be incorporated. |
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HOW DOES IT WORK?
 Supply pressure at the inlet port enters the valve and is visible to all sides of the poppet, which is also the armature. Thus, pressure assists the spring loaded armature closed, causing the elastomeric material to rest on the seat. This approach permits very low leakage characteristics.
When the coil is energized, the armature is attracted to the pole piece, overcoming the compression spring and pressure to cause the valve to open. The flow then passes through the seat and moves on to the outlet. When the electrical signal is removed, the compression spring and pressure differential acting on the poppet due to the seat area cause the valve to again close.
The valve must drop out before the current drops to 15 mA at room temperature. |
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| HOW IS IT USED? |
| This economical valve uses materials compatible with aviation fuels. The wide temperature range permits its use at various locations in the fuel system. The two-way normally closed configuration may be used to bypass flow from a control circuit when energized. Since it is rated continuous duty, it could also be used to enable a pilot flow control circuit, with a fail-closed characteristic if the circuit designer prefers. The valve is also compatible with hydraulic fluids. While this valve has a proof pressure rating of 1500 PSI, higher pressures are possible. |
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