dd15 air compressor safety valve supplier

New replacement air compressor pressure safety relief valves. Using the correct one for your application is critical for safety. If you need help picking the right one, please call us for assistance.

Why do you think it is the unloader valve? Was the system purging like it is now prior. replacing the dryer cartridge? Something to consider, just because you replaced the dryer cartridge, does not fix the purge valve or heater element.

Working on the air compressor on a DD15 can be difficult, it is mounted at the rear of the engine on the drivers side, off of the accesory drive. It has the power steering pump mounted to the end of the compressor.

When getting into the compressor and other items running off the acessory drive, you really need to put things back together with new O-rings, seals, gaskets bolts and crush washers.

A reciprocating air compressor is a positive displacement mechanical device that relies on a cylinder and crankshaft-driven piston to produce compressed air. An unloader valve is one of the many small but essential parts and components that ensure the effective, efficient operation of a reciprocating compressor.

A compressor unloader valve is a small part, typically measuring approximately 4-5 inches in length and width. It performs the critical function of releasing trapped air inside the tank, enabling the motor to restart. An unloader valve malfunction is one of the more common air compressor issues. If the trapped air cannot escape, the accumulated pressure may be enough to keep the motor from restarting.

The type of unloader valve found in an air compressor depends on the machine’s make and size. Some operate via a toggle switch on the side of the unit’s pressure switch. Others have an integral valve installed under the pressure switch.

During the operation of a typical reciprocating air compressor, the machine’s electric motor-driven tank fills with air. The device contains a pressure switch that responds to the air accumulation by shutting off the motor’s power supply. The compressor pump, which is attached to the motor shaft, also stops.

When the motor attempts to restart, the air trapped inside the cylinder generates a load that makes it more challenging to execute the task. By venting the air, the unloader valve reduces the load over the piston, facilitating the restarting process.

If you own a smaller reciprocating air compressor, you’ll likely find the unloader valve mounted on or inside the pressure switch. When the switch shuts the compressor off, it actuates the valve. A small tube or pipe runs from the check valve, a device that keeps the entire tank from draining, to the unloader valve.

A larger air compressor often features a more sizeable unloader valve controlled by air pressure emanating from a smaller pilot valve. In this arrangement, the valve typically sits next to the compressor.

When the air pressure inside the compressor’s tank reaches the pressure switch’s cut out pressure (the point when air is no longer delivered), the switch automatically trips off and interrupts the power supply to the motor. This process causes the unloader valve to open and vent the accumulated air.

When the tank pressure drops back down to the predetermined setting on the pressure switch, it causes the switch to trip again. This action results in the release of the unloader valve’s pin, preventing the escape of compressed air into the atmosphere.

As a leading provider of high-quality compressed air equipment for companies in a wide range of industries, Quincy Compressor can answer all your questions about unloader valves, their purpose and how they work. Feel free to contact us today for more information.

If the tank is over pressurized, the pressure switch isn"t shutting off the motor when the air tank fills to the cut-out pressure. Move the pressure switch lever to the off position. If the compressor continues to run, replace the pressure switch, because the switch isn"t shutting off the compressor motor.

If the compressor shuts off when you move the pressure switch lever to the off position, pull the safety valve ring and release all air from the tank. Switch the pressure switch lever to the on position and allow the tank to fill. If the compressor doesn"t shut off when the air tank fills to the cut-out pressure, replace the pressure switch, because the switch isn"t shutting off the compressor motor when tank pressure reaches the cut-out pressure.

If the tank is over pressurized, the pressure switch isn"t shutting off the motor when the air tank fills to the cut-out pressure. Move the pressure switch lever to the off position. If the compressor continues to run, replace the pressure switch, because the switch isn"t shutting off the compressor motor.

If the compressor shuts off when you move the pressure switch lever to the off position, pull the safety valve ring and release all air from the tank. Switch the pressure switch lever to the on position and allow the tank to fill. If the compressor doesn"t shut off when the air tank fills to the cut-out pressure, replace the pressure switch, because the switch isn"t shutting off the compressor motor when tank pressure reaches the cut-out pressure.

We are a leading manufacturer of high quality valves serving the compressed air, pressure washer, automotive, fluid power, fire protection, specialty gas, and pneumatic industries.

The Model “ST” safety valve is our standard safety valve for small air compressor systems and related applications. Even though the size is compact, flow capacities are high.

Resilient rubber pad, offered in silicone or flourocarbon, insures valve is bubble-tight to within 10% of set pressure. Three inlet sizes are available: 1/8″ NPT, 1/4″ NPT, and 3/8″ NPT.

Model “SV” ASME safety valves are designed for systems where large flow capacities are needed. Resilient pad insures valve is bubble-tight to within 10% of set pressure. Inlet size: 1/2″ NPT.

Model “SB” safety valves offer Control Devices value to users of high capacity ASME safety valves. Unique O-ring seal insures valve is bubble-tight to within 10% of set pressure. 1/2″ NPT and 3/4″ NPT inlets available.

The model “SW” valve is our highest capacity ASME safety valve. Unique O-ring seal insures valve is bubble-tight to within 10% of set pressure. 1″ NPT and 1¼” NPT inlets available.

The Super-Chek® design has been proven over the last 15 years to be the standard for air compressor in-tank check valves. One-piece brass bodies, stainless steel springs, and glass-filled fluoropolymer poppets all add up to long term reliability, while the eight discharge holes insure quiet operation.

Valves may be disassembled for cleaning or repair. Valves are 100% tested for backflow leakage performance. 450 PSI max pressure, 400 deg. F max temperature.

These cast-brass check valves have been specifically designed for installation into air compressor discharge lines. Extra-heavy walled cast brass bodies, glass-filled fluoropolymer poppets, and stainless springs resist corrosion and insure long life.