Valve actuators

Details Valve actuators Valve actuators

1982-04-20

1984-04-24

Rubinson, G. Z.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318286, 318282, 318283, 318603, 363129, 363126, H02K 2730

Patent

active

044450753

ABSTRACT:
A valve actuator comprises a variable speed motor, a speed control circuit for controlling the motor speed including speed selector means by means of which the desired motor speed can be set to different values by adjustment means. A torque limit control circuit is arranged to stop said motor when a pre-set torque limit has been exceeded. The torque limit control includes a torque sensor arranged to provide a measure of torque from one or more torque-related electrical parameters of the motor for example a torque related current flowing in the motor, and adjustment means for setting torque limit control circuit to different torque limits.

REFERENCES:
patent: 3008080 (1961-11-01), Storsand
patent: 3099777 (1963-07-01), Davis
patent: 3291971 (1966-12-01), Dunne
patent: 3322994 (1967-05-01), Dever et al.
patent: 3997826 (1976-12-01), Mayer
patent: 4097786 (1978-06-01), Lund
patent: 4122517 (1978-10-01), Hayashi et al.
patent: 4182126 (1980-01-01), Blakeslee
patent: 4234833 (1980-11-01), Barrett
patent: 4364111 (1982-12-01), Jocz
patent: 4365188 (1982-12-01), Walter

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