Motors: expansible chamber type – With motive fluid valve – Relatively movable inlet and exhaust valves for single...
Patent
1996-08-23
1997-10-28
Nguyen, Hoang
Motors: expansible chamber type
With motive fluid valve
Relatively movable inlet and exhaust valves for single...
81468, 251 61, 251205, 137102, F15B 1108, F16K 31145
Patent
active
056808062
ABSTRACT:
A flow control valve has a gate connected between an operating fluid inlet and outlet. An actuator permits manual adjustment of the gate area to allow fluid to pass from the inlet to the outlet at a threshold rate of flow for a threshold pressure at the first inlet. A biasing mechanism cooperable with the gate and linearly responsive to variations in a control pressure applied to a control inlet of the valve constantly automatically readjusts the area of the gate in proportion to the control pressure. In a constant speed pneumatic motor application of the valve, the motor inlet pressure is applied to the control inlet of the valve and the motor outlet pressure is applied to the operating fluid inlet of the valve. A regulator connected to the motor inlet senses the pressure at the motor outlet. In operation, at idle, the threshold flow rate through the valve is selected by manual adjustment of the valve actuator or stem. The load is added and the motor outlet pressure decreases. The regulator senses the change and increases the motor inlet pressure accordingly. As the motor inlet pressure varies, the size of the valve gate varies proportionately so that the rate of fluid flow through the motor, and therefore the motor speed, remains constant.
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Catalano Frank J.
Nguyen Hoang
Zingerman Scott R.
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