Solenoid-controlled pilot-operated three-position switching valv

Details Solenoid-controlled pilot-operated three-position switching valv Solenoid-controlled pilot-operated three-position switching valv

1998-11-19

1999-11-30

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762566, F15B 13043

Patent

active

059924608

ABSTRACT:
A three-position switching valve has a spool positioned in a valve hole that is moved relative to two drive chambers positioned on either end of the valve hole. Solenoid-controlled pilot valves are provided to control supplying and ejecting a pilot fluid to and from the two respective drive chambers. This spool is held at a neutral position by the provision of two piston chambers being formed adjacent to each of the drive chambers and constantly receiving pilot fluid through a channel, the piston chambers each having a smaller diameter than that of the drive chambers. Each piston chamber accommodates a piston which may slidably move so as to be urged by pilot fluid toward the spool and a linking member interposed between each of the pistons and the spool. A return spring is interposed between each of the pistons and each linking member as part of the structure holding the spools at the neutral position.

REFERENCES:
patent: 3267965 (1966-08-01), Kroffke
patent: 4267862 (1981-05-01), Neff et al.

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