Pneumatic or-and and or-and element

Abstract

Pneumatic OR-AND and OR-AND element contains two-position, seven-port manifold, upper and lower control channels, normally closed input channel, and upper, middle, and lower normally open input channels, which are connected to upper, middle, and lower output channels, respectively, in the initial position. Closed input channel is connected to middle normally open input channel. Middle output channel is blocked and contains spring that returns manifold to its initial position. Closed input channel is connected to pressure supply.