This power-off solenoid vent valve works as an air compressor unloader valve: a square cast aluminium valve body with a brass plunger tube and black knob, driven by a 220V coil, that vents trapped pressure when the power is cut. It is sold as the valve body alone, as a coil with indicator light and no wire, or as a coil with light and a wire of approx. 36cm, so you can choose the part you need to replace.
Features and benefits:
- Power-off vent: releases excess pressure when the coil loses power, which helps protect the compressor from starting against a loaded head.
- Square valve body in cast aluminium with a silver finish, a brass plunger tube and a black plastic knob.
- Threaded connection port on one side of the body for fitting into the compressor air line.
- 220V coil rated AC220V 5.5VA at 100% ED and IP65, with an indicator light so you can see when it is energised.
- Supplier describes it as mute and oil-free in design, for quiet running and clean air output.
- Three variants: valve body only, coil with light and no wire, or coil with light and wire (wire length approx. 36cm), so a failed part can be replaced on its own.
Applications:
- Replacing a worn or failed unloader valve on an oil-free air compressor
- Replacing a burnt-out 220V solenoid coil on a power-off vent valve
- Workshop, school and maintenance compressor repair
- Spares stock for small pneumatic systems
In the box:
One item per order, depending on the option chosen: 1 x square valve body, or 1 x coil with light and no wire, or 1 x coil with light and wire.
Note: Mains voltage item. Isolate the compressor and release all air pressure before removing or fitting the valve or coil, and have the wiring done by a competent person. Check the coil label and port thread against your compressor before ordering. Colour and size may differ slightly from the pictures.
Type: Power-off solenoid vent valve (unloader). Valve body material: Cast aluminium, silver finish. Plunger tube: Brass, with black plastic knob. Valve body shape: Square. Coil voltage: 220V AC. Coil rating: AC220V 5.5VA. Coil voltage range: AC187V to 253V (one label reads AC175V to 253V). Duty rating: 100% ED. Ingress protection: IP65. Coil wire length: Approx. 36cm (wire version). Coil indicator: Light fitted. Options: A: valve body only; B: coil with light, no wire; C: coil with light and wire. Design: Oil-free, mute (supplier description). Connection: Threaded port on one side of the body. Body material: Cast aluminium. Finish: Silver body, black knob. Wire length: Approx. 36cm. Coil label (one version): EVI 7/9, 220V AC, 6.0VA, 29mA, 100% ED, IP 65. Coil label (other version): AC220V 5.5VA. Supply: 220V AC mains, hard-wired coil (no plug). Package contents: 1 x valve body, or 1 x coil with light and no wire, or 1 x coil with light and wire. Size tolerance: Supplier notes slight manual measurement deviation. Q: Where is the unloader valve on an air compressor? A: It is normally fitted on or beside the pump head or the line from the head to the tank, where it can vent air when the motor stops. Check your compressor manual for the exact position.. Q: What does a power-off solenoid vent valve do? A: When the coil loses power the valve opens and releases trapped pressure from the pump head. This lets the motor restart without pushing against a loaded head.. Q: Can I buy just the coil or just the valve body? A: Yes. Option A is the valve body only, option B is the 220V coil with light and no wire, and option C is the coil with light and a wire of approx. 36cm.. Q: What voltage does the coil run on? A: It is a 220V AC coil, labelled AC220V 5.5VA, with a stated range of AC187V to 253V. One label reads AC175V to 253V.. Q: Is this valve suitable for oil-free compressors? A: The supplier describes it as an oil-free design for oil-free air compressors. Check that the port thread and fitting suit your machine before ordering..