What does unloader valve look like?

An unloader valve is a pressure relief valve used in compressed air systems. It is designed to prevent the pressure from exceeding a set limit by releasing excess air. Unloader valves are typically located at the outlet of the compressor or air receiver.

Unloader valves can be either manual or automatic. Manual unloader valves are operated by hand, while automatic unloader valves are controlled by a pressure switch. When the pressure in the system reaches the set limit, the unloader valve opens and releases air until the pressure drops below the set limit.

Unloader valves are typically made of brass or stainless steel. They have a body with a threaded inlet and outlet connection, a valve seat, and a valve poppet. The valve poppet is held in place by a spring. When the pressure in the system reaches the set limit, the spring is compressed and the valve poppet lifts off the valve seat, allowing air to escape.

Unloader valves are an important part of compressed air systems. They help to protect the compressor and other components from damage caused by excessive pressure.