Utilize these pilot operated relief valves to control the maximum pressure in a hydraulic circuit. These rugged relief valves are cast iron in construction and used heavily for industrial applications, however they can be used on mobile applications as well. There are two pressure ports, one on each side, to allow the valve to be installed inline on the pressure line. The tank port is located on the rear of this valve. The gauge port is located on the front with the pressure adjustment knob. Rotate the adjustment clockwise to increase the pressure, counterclockwise to decrease the pressure. Use a center back mount gauge if a gauge is desired. All have a 1/4” NPT gauge port.