Apply and relief valve mechanism for a fluid power apparatus

Details Apply and relief valve mechanism for a fluid power apparatus Apply and relief valve mechanism for a fluid power apparatus

1993-05-24

1994-08-23

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

92 48, 92 98R, 605471, F15B 910

Patent

active

053397223

ABSTRACT:
The improved apply and relief valve mechanism (111, 112, 115, 117, 119, 120, 130, 132) for a fluid power apparatus (10) comprises a valve rod (112) having at one end (114) an integral, enlarged diameter spring retainer section (119), at a second end (113) a plurality of longitudinally extending grooves or passageways (132) in the valve rod (112) and a circumferential groove (111), a generally cylindrically shaped seal/reaction piston (120, 130) attached to the second end (113) of the valve rod (112) by way of a snap ring (115) received within the circumferential groove (111), and a spring mechanism (117) disposed around the valve rod (112) to abut the spring retainer section (119) and bias the reaction piston (120, 130) into engagement with the snap ring (115). The passageways (132) in the second end (113) of the valve rod (112) provide for improved fluid flow so that the fluid power apparatus (10) will not experience self actuation.

REFERENCES:
patent: 3151532 (1964-10-01), Ayers, Jr.
patent: 3250184 (1966-05-01), DeHoff
patent: 3410179 (1968-11-01), Kytta et al.
patent: 3417668 (1968-12-01), Lawson
patent: 4718326 (1988-01-01), Sugiura et al.
patent: 4961846 (1990-10-01), Isakson
patent: 5031404 (1991-07-01), Flory et al.
patent: 5086690 (1992-02-01), Flory et al.

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