HYDAX Gauge Isolator Valve protects the pressure gauge from damage due to pressure surges, hydraulic shock and mechanical vibrations. The fluid is completely isolated from the gauge and connected directly to the gauge port as long as the knob is kept pressed thereby giving instant and accurate readings on the gauge. On release of the knob, the spring-loaded valve closes automatically to connect the gauge port to the tank by blocking the pressure port. An orifice in the gauge port acts as a partial snubber and protects the gauge from the initial surge of fluid when the knob is pressed. The Single Station Gauge Isolator Valve: