Normally open relay valve for Williams WM338

The WM338P is a normally open, non-compensating, adjustable relay valve engineered for pneumatic control systems. In its default state, the valve allows airflow, and it operates as a relay to amplify signals, using a pilot control pressure to regulate a larger volume or higher pressure air flow. The adjustable design allows technicians to calibrate the output pressure to meet specific system requirements. This component is part of the Williams WM338 series, which is utilized in heavy machinery and industrial vehicles relying on compressed air for critical operations.

This relay valve is compatible with the Williams WM338 series. As a non-compensating unit, the pressure set point may shift in response to variations in supply pressure, a factor to account for during system calibration. The adjustment mechanism allows for precise manual configuration of the output pressure levels. Relay valves of this type are commonly integrated into pneumatic circuits such as air brake systems, transmission controls, and various pneumatic actuators found in cranes, trucks, and construction equipment.

Relay valves serve to speed up the response of pneumatic systems by reducing the distance air must travel from the supply source to the actuator. By receiving a control signal, they allow a direct, high-volume air supply to fill or exhaust the actuator, ensuring rapid and controlled movement of the machine components.