Valves and valve actuation – Hermetic flexible wall seal for actuator – Bellows
Patent
1995-11-08
1997-06-03
Chambers, A. Michael
Valves and valve actuation
Hermetic flexible wall seal for actuator
Bellows
251 636, F16K 31122
Patent
active
056346271
ABSTRACT:
An actuator comprises a valve case opened upward, a gas-driven actuator having a fixed portion provided on the valve case and fixed thereto and an operating portion movable upward and downward by a drive gas when the gas flows in or out, a valve stem extending upward from inside the valve case to above the case and having its upper end fixed to the operating portion of the actuator, and a valve element provided on the lower end of the valve stem. A valve case fluid seal bellows and an actuator gas seal bellows are connected between the valve stem and the actuator fixed portion and between the actuator fixed portion and operating portion, respectively. A vacuum is contained in a closed space formed by the valve stem, fluid seal bellows, actuator fixed portion, gas seal bellows and actuator operating portion. The variations in the internal pressure of the closed space due to variations in the ambient temperature are much smaller than the pressure of the drive gas, so that the flow rate of fluid remains unchanged by the variations in the ambient temperature.
REFERENCES:
patent: 1992902 (1935-02-01), McIntosh
patent: 4201366 (1980-05-01), Danko et al.
patent: 4309022 (1982-01-01), Reinieke et al.
patent: 4515344 (1985-05-01), Gemignani
patent: 4583710 (1986-04-01), Adams et al.
patent: 4687017 (1987-08-01), Dunko et al.
Drawing No. 1010483, Kammer Ventile Jan. 19, 1995.
Drawing No. 950419, Apr. 19, 1995.
Daido Kunihiko
Ogawa Shuhei
Yoshikawa Kazuhiro
Chambers A. Michael
Fujikin Incorporated
LandOfFree
Controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-385866