#39 • Triac Spring Return Rack & Pinion Actuators

Part of November's Online Consignment & Equipment Auction! (timed auction by Mountaineer Machinery and Auctioneers)

High bid $2.00

Status: Sold

Triac Spring Return Rack & Pinion Actuators 2R1200SR5 Rack & Pinion Actuator, Spring-return Pneumatic spring return actuators are spring opposed pneumatic cylinders. A 3-way solenoid valve is used to operate a spring return actuator. The normal position is the position of the valve with the spring extended and the solenoid de-energized. The available force is the pressure times the area of the piston less the spring force [F=(PxA)-Fs] in one direction and the available spring compression force in the opposite. Spring force is determined by the spring rate (K) times the compression, in inches (F=KxIn) at any given position of stroke. Spring and piston actuators are typically sized for 80 psi minimum. Spring and diaphragm actuators (for Control Valves) should be sized for 35 psi (6-30 psi signal). Spring return actuators are inherently fail safe. Trip valves are available for lock-in-last position fail action.     (see pics)