Valves and valve actuation – Electrically actuated valve – Rotary electric actuator
Patent
1991-09-27
1993-04-27
Rosenthal, Arnold
Valves and valve actuation
Electrically actuated valve
Rotary electric actuator
25112912, 25112903, 310 75A, 310 97, F16K 3104
Patent
active
052055345
ABSTRACT:
A zone valve for a hydronic system (either heating or cooling) in which a motor-driven actuator rotates a ball valve through approximately 90.degree., between closed and opened positions. The ball valve provides lower flow resistance than that of conventional heat-motor and motorized zone valves, allowing the use of lower rated pumps, and allowing a single size valve to serve most applications. A restoring torque is provided by a tension spring so configured that it provides sufficient restoring torque to overcome the frictional torque of the ball valve. The restoring torque is kept from building up during rotation by configuring the spring in such a manner that its force varies inversely with the effective moment arm. The restoring torque varies by no more than 20% (preferably no more than 10%) during rotation of the ball valve. This assures that enough torque is always available to restore the valve to its closed (or open, in a normally open case) position, after the motor is de-energized, but that there is not too much torque for the motor to overcome when it moves the valve into the open position.
REFERENCES:
patent: 3319646 (1967-05-01), Smulka
patent: 3541366 (1970-11-01), Baxter et al.
patent: 4205783 (1980-06-01), Dietsche et al.
patent: 5085401 (1992-02-01), Botting et al.
Rosenthal Arnold
Taco Inc.
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