Fail-to-neutral module

Details Fail-to-neutral module Fail-to-neutral module

1978-05-23

1980-02-05

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

137544, 13762561, F15B 13042, F16K 31383

Patent

active

041869095

ABSTRACT:
Disclosed is an improved hydraulic control comprising a fail-to-neutral module. As is conventional, the hydraulic control comprises a main spool and a fluid flow path comprising a bridge circuit including a driver stage. The fail-to-neutral module comprises means defining a fail-to-neutral orifice which (a) is located in the fluid flow path upstream of the bridge circuit and (b) has a relatively large flow area but a maximum dimension smaller than the smallest orifice in the pilot stage. Preferably the means comprise a pin positioned through a hole, the pin and the hole both being circular in cross-section and coaxial, and the fail-to-neutral orifice is the clearance between the pin and the boundary of the hole.

REFERENCES:
patent: 3101650 (1963-08-01), Blanton
patent: 3135294 (1964-06-01), Huber
patent: 3964518 (1976-06-01), Hesse et al.
patent: 4011891 (1977-03-01), Knutson et al.
patent: 4023593 (1977-05-01), Piccardo
Kinney et al., "What You Can Get in Electrohydraulic Servo Valves", Applied Hydraulics and Pneumatics, Feb. 1959, pp. 67 and 74.

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