Hydraulic valve actuator

Details Hydraulic valve actuator Hydraulic valve actuator

1990-07-26

1991-12-10

Kwon, John T.

Expansible chamber devices

Annular working member or annular linearly extending chamber...

92109, 92130R, 92130C, F01B 3100

Patent

active

050707663

ABSTRACT:
This hydraulic actuator has a drive volume (11) pressurized by extreme-pressure oil. The oil pressure is converted into a valve movement by a drive piston (10). A spring element acts upon the drive piston (10) in a manner opposing the oil pressure. The actuator is to be constructed such that extreme-pressure oil escaping from the drive volume (11) cannot cause any consequential damage. This is achieved in that the drive volume (11) is completely surrounded by a safety volume (3, 7) filled with low-pressure oil.

REFERENCES:
patent: 2976845 (1961-03-01), Goldring
patent: 3331291 (1967-07-01), Seablom
patent: 3379405 (1968-04-01), Natho
patent: 3726187 (1973-04-01), Lewis
patent: 3741075 (1973-06-01), Moseley et al.
patent: 4103864 (1978-08-01), Hagendorn
patent: 4585207 (1986-04-01), Shelton
patent: 4601456 (1986-07-01), Austin et al.
patent: 4744386 (1988-05-01), Frazer
patent: 4877217 (1989-10-01), Peil et al.

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