Fluid handling – Systems – Multi-way valve unit
Patent
1996-10-10
1998-03-03
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
25112911, F15B 13044
Patent
active
057224609
ABSTRACT:
A novel digital servo valve system for use in controlling a displaceable actuator includes a valve body with ports, a valve spool displaceable within the valve body to regulate fluid flow through the ports, and a motor having a drive shaft which displaces the valve spool. The system is characterized by a null adjustment mechanism which makes a null rotational position of the drive shaft coincide with a null position of the valve spool, at which positions the valve spool cuts off fluid flow through the ports. The null adjustment mechanism provided in accordance with the present invention permits the null positions of the valve spool and stepper motor to be adjusted without having to disassemble the servo valve.
REFERENCES:
patent: 2985566 (1961-05-01), Tsien et al.
patent: 4507634 (1985-03-01), Vanderlaan
patent: 4641812 (1987-02-01), Vanderlaan et al.
patent: 4645178 (1987-02-01), Martin et al.
patent: 4673160 (1987-06-01), Tolley
patent: 4951549 (1990-08-01), Olsen et al.
D'Angelo Gary F.
Hamman Eric J.
Olsen Zenny
Michalsky Gerald A.
Olsen Controls, Inc.
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