Pneumatic valve assembly and method

摘要

A valve assembly for receiving a fluid under pressure and comprising a plurality of valves in a single valve block. The assembly may include a plurality of check valves and including a counterbalance generating valve and a 3-way valve and including a method of use. The assembly may include an adjustable counterbalance valve, a pilot-operated check valve and a 3-way valve or combinations thereof.

主权项

1. A valve comprising:
a valve body comprising: a first pilot bore, said first pilot bore including an input bore having an input port, an output bore having an output port, and a first cartridge spool having an integral main seat said integral main seat movable along a centerline of said first cartridge spool and biased by a spring movable in a first direction to close said main seat, said first cartridge spool being disposed at least partially within said first pilot bore and biased by a cartridge spring; a second pilot bore, said second pilot bore including an input bore having an input port, an output bore having an output port, said second pilot bore including a second cartridge spool having an integral main seat, said second cartridge spool being disposed at least partially within said second pilot bore; said first cartridge spool including a shaft, said integral main seat being movable with respect to said shaft during operation, said shaft connecting opposing pistons, wherein said integral main seat of said first cartridge spool is located on the centerline of said first cartridge spool and between said opposing pistons, said opposing pistons being arranged to balance one another; and said second cartridge spool including opposing pistons.