Springless pilot operated sequence valve

Details Springless pilot operated sequence valve Springless pilot operated sequence valve

1993-08-09

1995-04-25

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

137906, F15B 13042

Patent

active

054090407

ABSTRACT:
A two-position, three-way pilot valve having a hollow spool valve element connected to a valve stem having first and second ends of equal diameter for pressure balancing the valve. A biasing piston engages one end of the valve stem and a pilot piston engages the other end of the valve stem. The pistons may include two piston rings of different diameter for holding the pistons in alignment. The ends of the spool valve element are structurally designed to maximize valve seating without overstressing.

REFERENCES:
patent: 3921660 (1975-11-01), Kowalski
patent: 3993100 (1976-11-01), Pollard et al.
patent: 4011892 (1977-03-01), Kowalski
patent: 4450869 (1984-05-01), Acker
patent: 4457489 (1984-07-01), Gilmore
patent: 4467833 (1984-08-01), Satterwhite et al.
patent: 4601311 (1986-07-01), Acker
patent: 4637419 (1987-01-01), Hughes
patent: 4817699 (1989-04-01), Barrier et al.
patent: 4848404 (1989-07-01), Hickok
patent: 4887643 (1989-12-01), Tomlin et al.
patent: 5056556 (1991-10-01), Nishimoto et al.

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