초록 ▼

A four way, pilot air operated air valve provided with flow control valves in individual exhaust passages in the valve body of the valve. The exhaust flow control valves are mounted in the valve cover. The pair of exhaust passages are connected to a common exhaust passageway which is connected to a

A four way, pilot air operated air valve provided with flow control valves in individual exhaust passages in the valve body of the valve. The exhaust flow control valves are mounted in the valve cover. The pair of exhaust passages are connected to a common exhaust passageway which is connected to a single exhaust port in the valve body. The four-way air valve includes a cartridge type pilot air valve. The pilot air for the pilot air valve can be supplied either internally or externally. The pilot air valve is operated by a suitable solenoid.

대표청구항 ▼

A cartridge type pilot air valve for operating the main valve spool in an air valve, characterized in that it includes: (a) a pilot air valve body; (b) a pilot valve piston movably mounted in a cylinder in said pilot air valve body, and having a front end and a rear end, and provided with an axial s

A cartridge type pilot air valve for operating the main valve spool in an air valve, characterized in that it includes: (a) a pilot air valve body; (b) a pilot valve piston movably mounted in a cylinder in said pilot air valve body, and having a front end and a rear end, and provided with an axial shaft which extends axially forward from the pilot valve piston front end and engages one end of the main valve spool, and having an axial bore extended inwardly from the rear end thereof and terminating adjacent the pilot valve piston front end; (c) a pilot valve element retainer releasably seated in the pilot air valve body and having an inner end and an outer end, and with the inner end slidably mounted in the axial bore in said pilot valve piston, and said retainer having an axial bore that extends inwardly from the outer end thereof and terminates in a transverse wall; (d) a pilot valve element movable mounted in the axial bore in the pilot valve element retainer and movable, by a spring mounted in the axial bore in said retainer, to a first operative position to block flow of pilot air to the pilot valve piston cylinder against the rear end of the pilot valve piston and allow exhaust of pilot air from the rear end of the pilot valve piston in said cylinder through exhaust passageway means formed along the outer periphery of the pilot valve element and through the axial bore in said retainer and passages through the front end of said piston and through the piston chamber to an external exhaust passage, and movable by a solenoid armature pusher member to a second operative position to allow flow of pilot air to the rear end of the pilot valve piston, to move the piston and the axial shaft thereon, which in turn moves the main valve spool.