초록 ▼

A four-mode pneumatic relay includes a relay body defining four chambers, each coupled to a port. Two of the chambers are formed by a diaphragm assembly consisting of a rolling diaphragm coupled to an input post that drives a movable orifice shaft and a pair of diaphragms of different effective area

A four-mode pneumatic relay includes a relay body defining four chambers, each coupled to a port. Two of the chambers are formed by a diaphragm assembly consisting of a rolling diaphragm coupled to an input post that drives a movable orifice shaft and a pair of diaphragms of different effective areas coupled to said movable orifice shaft. A movable plug assembly includes valve plugs for interconnecting the first chamber with the second chamber and the second chamber with the third chamber via a valve seat and an orifice and recess in the movable orifice shaft. A pair of mechanical switches couple different ones of said ports for providing multi-mode operation. One switch supplies input pressure to either the first port or the third port and another switch couples the second and fourth ports together to vents the fourth port.

대표청구항 ▼

A force balanced multi-mode pneumatic relay comprising: a relay body including first and second input ports and first and second output ports; an orifice shaft movable in response to an input force; diaphragm means coupled to said orifice shaft and in communication with said second input port and sa

A force balanced multi-mode pneumatic relay comprising: a relay body including first and second input ports and first and second output ports; an orifice shaft movable in response to an input force; diaphragm means coupled to said orifice shaft and in communication with said second input port and said first and second output ports; valve plug means engageable with said orifice shaft for opening and closing a first valve seat, situated between said first input ports and said first output port, and a second valve seat in said orifice shaft, said orifice shaft including means communicating between said first output port and said second input port; spring means for applying forces to said orifice shaft and to said valve plug means; and mechanical switch means for selectively enabling supply and output pressures to be coupled to different ones of said ports for selectively changing the operating mode of said relay among direct/snap, direct/proportional, reverse/snap and reverse/proportional modes.