![]() Adjust the tension on the new unloader valve according to the pump manufacturer’s specified pressure.įind Reciprocating Compressor Unloader Valve Parts at Quincy CompressorĪ new unloader valve can save you significant time and expenses.Cut a small amount of the line with the snipping pliers to ensure a clean connection.Apply thread lubricant to the new valve.Disconnect the wires from the pressure switch.Īfter removing the old valve, you can install the new one with these instructions:.Use the adjustable pliers or a wrench to remove the quick-connect fitting if the valve has one.It’s connected to a hose that transfers water to the recirculation pump. After the pressure releases, identify the unloader valve. Whether you’re working with a toggle switch on the side of the pressure controller or a valve that mounts directly to the unit, both types require the same materials for replacements:įirst, open the drain valve to depressurize the tank. ![]() Various air compressors have different types of unloader valves. Learn more about how to replace an unloader valve below. You should replace faulty unloader valves as soon as possible before they impact other critical compressor components. When the interior components can’t move, this prevents the engine shaft from opening. Closed valves result in significant pressure buildups that can restrict the pump’s internal components. Open valves release a continuous stream of leaking air. When the unloader valve malfunctions, it becomes unable to open or close. When the air cannot escape from the tank, the built-up pressure often hinders the unit’s ability to restart. How to Replace an Unloader ValveĪ malfunctioning unloader valve is one of the most common issues that prevents a compressor from operating properly. This action results in the release of the unloader valve’s pin, preventing the escape of compressed air into the atmosphere. When the tank pressure drops back down to the predetermined setting on the pressure switch, it causes the switch to trip again. After the power supply turns off, the unloader valve opens and vents the accumulated air. When the air pressure within the compressor tank arrives at the point where it cannot deliver any more air, the valve switch automatically disrupts the power supply to the motor. A small tube or pipe runs from the check valve - a device that keeps the entire tank from draining - to the unloader valve.Ī larger air compressor usually contains a larger unloader valve. It’s controlled by air pressure that’s released from a smaller pilot valve. In this arrangement, the valve typically sits next to the compressor. Unloader valves are located on top of or inside the pressure switch in smaller reciprocating air compressors. When the switch shuts the compressor off, it actuates the valve. When the motor tries to restart, the trapped air produces a load that restricts its ability to switch on. By venting the air, the unloader valve minimizes the load across the piston, which encourages the repowering process. The compressor pump, which is attached to the motor shaft, also stops. The device contains a pressure switch that responds to air accumulation by shutting off the motor’s power supply. ![]() What Is the Purpose of an Unloader Valve?ĭuring the operation of a typical reciprocating air compressor, the machine’s electric motor-driven tank fills with air. Others have an integral valve installed under the pressure switch. ![]() Some operate via a toggle switch on the side of the unit’s pressure switch. If the unloader valve cannot release the air, the built-up pressure might prevent the motor from starting.Īn air compressor’s valve type depends on the machine’s make and size. The valve releases trapped air from inside the compressor’s tank, which allows the motor to restart. What Is an Unloader Valve?Ī compressor unloader valve is a small part, usually sized between 4 and 5 inches. An unloader valve is a small and essential part that ensures the effective, efficient operation of a reciprocating compressor. A reciprocating air compressor is a positive displacement mechanical device that uses a cylinder and crankshaft-driven piston to produce compressed air. ![]()
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