Temperature Control Valve With Pressure Relief

摘要

The disclosed fluid flow control valve provides alternatively acting valves to define a bypass fluid flow path during warm-up and a steady state (cooling) flow path thereafter. A first valve closes a fluid flow return path from a fluid cooler, while the second valve closes the bypass flow path between the fluid source and fluid return. The actuator itself forms one of the valves, while a second valve member is slidably secured to the actuator to engage a valve seat in the bypass passage. The actuator is responsive to a temperature increase above a predetermined set-point by generating an axial force F to move the actuator from a bypass position to a steady state (cooling) position. The second valve member is biased toward an axially extended position by a bias member. Excess fluid pressure in the hot side of the valve body moves the valve member relative to the actuator to regulate pressure delivered to the fluid cooler.