Drive control valve for constant speed

Details Drive control valve for constant speed Drive control valve for constant speed

1988-10-14

1990-04-17

Garrett, Robert E.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91 31, 91448, F15B 1108, F15B 1304

Patent

active

049170015

ABSTRACT:
The drive control valve for constant speed is for driving a pneumatic actuator at a constant speed by use of a meter-out control mode, and includes a nonreturn valve for blocking discharged air from its pressure chamber and a relief valve for controlling the air pressure in the pressure chamber so as to be equal to an adjustable set pressure which is constant. When air pressure is supplied to one of the pressure chambers of the pneumatic actuator, the air pressure air discharged from the other pressure chamber is blocked by the nonreturn valve, so that it is discharged to the outside through a relief valve. In this case, however, the air pressure of the pressure chamber on the exhaust side is maintained at a set pressure for the relief valve which is set beforehand, and hence, the flow rate of air discharged from the pressure chamber becomes constant, and the pneumatic actuator is driven at a constant speed.

REFERENCES:
patent: 3513878 (1970-05-01), Smith
patent: 4175473 (1979-11-01), Iizumi
Fluid Controls, Inc., Hydraulic Control Valves, 10/1984, FC-5 to 7.
Sterling Hydraulics Ltd., Hydraulic Valves Pressure & Flow Control, 6/1987, A.34-A.37.

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