Valves

Details Valves Valves

1981-04-20

1983-06-21

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91446, 137596, 13762568, F15B 1104, F15B 1302

Patent

active

043889468

ABSTRACT:
A valve is provided, particularly as a part of a block control device, made up of an elongate housing having a longitudinal bore with spaced work chambers, inlet chambers and exhaust chambers intersecting the bore and an elongate cylindrical spool slidable in said bore, having a second bore in each end of said spool, a brake piston movable in each second bore, a pair of restrictor passage means one in said spool and one in said brake piston connecting the interior of said spool with both ends of each bore in the spool on opposite ends of the piston, a pair of spaced transverse passages at each end of the spool communicating with each bore in the spool and spaced to connect a work chamber and pressure fluid chamber at one end of the spool and a work chamber and exhaust chamber at the other end of the spool in a work position, an annular groove in the brake piston capable of connecting said spaced passages within the bore in the spool whereby in said work position pressure fluid flows from a pressure fluid chamber through said transverse passages to a work chamber at one end of the spool, and the pressure fluid from a pressure fluid chamber through said restricting passages to act on the brake piston to move it to position the groove between the passages at the other end of the spool to regulate flow of fluid between the work chamber and exhaust chamber in accordance with the relative pressure in the pressure fluid chamber.

REFERENCES:
patent: 2946347 (1960-07-01), Ruhl
patent: 3910311 (1975-10-01), Wilke
patent: 4187877 (1980-02-01), Hodgson et al.

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