This is typically caused by a failing thermocouple that can no longer generate the 25û30 millivolts required to hold the pilot valve open

requiring no minimum differential to open

this RK 909 VT total relief valve kit provides all necessary internals to restore hydraulic performance

Common Questions & Technical Support What causes this valve to fail to stay open

Johnson Controls V47AR-3 Valve THPU32HP7Y This is typically caused byThe Johnson Controls V47AR 3 is a rugged, 1 1 2 inch ASME flange direct acting temperature actuated water regulating valve engineered for demanding hydronic and process cooling applications. This cast iron water valve is designed to modulate water flow through a heat exchanger to maintain a specific temperature setpoint between 160F and 230F. Equipped with a 6 foot capillary and a Style 4 sensing bulb (11 16" diameter x 6" length), it utilizes a 1 2"