4087 Exhaust Gas Temperature Valve

Actuation of the valve is caused by increasing temperature expanding the stainless steel well at a rate faster than that of Rod. Pushrod moves toward the well, permitting the two Balls to slip into a groove between Upper Piston and Trip Plunger. This releases the piston which is spring loaded by Main Spring. The piston moves upward permitting the middle O-ring seal to move past the IN Port, connecting IN to VENT. Re-setting of the valve is accomplished by firmly depressing the top of Piston after the well has been permitted to cool back down below the trip point.