Feel free to contact us today for more information. If the trapped air cannot escape, the accumulated pressure may be enough to keep the motor from restarting. CDN$64.95. This short video shows the various types of Unloader Valves available. Pressure relief valves can be used wherever a low-flow, variable-pressure relief valve is required. When the air compressor switch trips, the valve relieves any pressure that might be trapped between the check valve and the pump. The type of unloader valve found in an air compressor depends on the machine’s make and size. All rights Reserved. Tool Repair is not affiliated with, or sponsored or endorsed by, the Husky or Workforce The Unloader Idle Piston is a device that, once the unloader valve is activated, brings the revs of the engine down to idle, so both compressor and engine are working at a much reduced speed. California residents 125 - 155 psi; Faulty unloader valves will cause the compressor to labor or have difficulty starting at all This valve serves a similar purpose to the unloader valve discussed above. Website by, (Contact us if your Country is not listed. Center, Bosch Square D Pumptrol Pressure switch for compressed air compressor 9013FHG12J52M1X 95-125 psi With Unloader & On/Off Lever (Paks) 4.6 out of 5 stars 199 $32.90 $ 32 . An unloader valve malfunction is one of the more common air compressor issues. Find out how Canfor Southern Pine as improved their operation by switching to Quincy Compressor. The rugged 69H series pressure switch is designed for the demanding requirement of larger, heavy duty commercial air compressors (up to 250 psi). Brand new Square D brand, Pumptrol air compressor pressure switch, model: 9013FHG42J59M1X 135-175 PSI with unloader control valve and On / Off switch. 68 If your compressor does not have an unloader line then this valve can be left not hooked up and the pressure switch will still function properly. Regardless of the location, when the air pressure in the storage tank reaches the cut-out pressure, the pressure switch turns off, which also stops the air compressor. If you buy a new pressure switch together with an unloader valve, make sure that the physical compressed air connection is the same. The device contains a pressure switch that responds to the air accumulation by shutting off the motor’s power supply. why? The unloader valve that is shown in the image above is typically found on the side of a compressor pressure switch, and is operated by a toggle lever coming out of the side of the pressure switch. C $92.60. CW210600SJ CAMPBELL HAUSFELD 100-135 PSI 4-PORT ... We have been proudly serving our customers for over 30 years and can answer any questions you have about your air compressor or dryer. Home » Blog » Unloader Valve: Its Purpose. KK-4315 UNLOADER PRESSURE RELIEF VALVE 69DCA The KK-4315 is the Pressure Relief Kit that screws to the side of the ON/OFF Pressure switch. There are few components on an air compressor that can multi-task quite like the piloted unloader valve. An unloader valve is one of the many small but essential parts and components that ensure the effective, efficient operation of a reciprocating compressor. The unloader valve mechanism is commonly part of a compressor pressure switch assembly. The compressor pump, which is attached to the motor shaft, also stops. 1/4″ or 6mm 90 0 unloader – Slow pressure release device. (There is another type of unloader valve , which can be found at the inlet of rotary screw compressors , also called inlet valve or loading valve). Pressure Release Valve/ Unloader Valve; The unloader may be located either on the side or bottom of the switch. They are available with an unloader valve, which prevents compressors from starting under load, and an auto-off disconnect lever for manual cut off the compressor. The air compressor unloader is valve is a small, but important, part of the reciprocating piston compressor. What the unloader valve does is that is responds to the compressor pressure switch turning the power off to the motor and allows any air that may be trapped over the piston, or pistons on a multi-cylinder air compressor, to vent to atmosphere, removing any load that the trapped air … Some operate via a toggle switch on the side of the unit’s pressure switch. 90 Dry Air Pac® - Compressor/Dryer Packages. 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