(18) Lumaco Microswitch Butterfly Valves. Maximum in-line flow pressure: 150 psi. Material of construction: 304 stainless steel. The unit can be installed on either actuator: Air-to-air or Air-to-spring. The cam is bolted into the gear shaft and rotates with the disc, triggering one switch when the valve is fully open, the other when fully closed. Inlets/outlets: (2) 2 in. dia. S-line fittings. Overall dimensions: 7-1/4 in. L x 4 in. W x 11 in. H. (ACN9a).