Double seat flow control valve

Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing

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Details

137312, 13761417, 13761418, 134166C, 251 635, 251 636, B08B 906, F16K 31222

Patent

active

056998252

ABSTRACT:
A double seat flow control valve includes three pneumatic pistons enclosed within two air chambers to operate upper and lower valve disks for venting operations in addition to valve opening and valve closing operations. An air boost is provided for the upper valve disk to maintain the upper valve disk in a closed position during venting of the lower valve disk.

REFERENCES:
patent: 4304251 (1981-12-01), Schadel et al.
patent: 4360039 (1982-11-01), Jeppsson
patent: 4368753 (1983-01-01), Brakelmann et al.
patent: 4373545 (1983-02-01), Knappe
patent: 4460014 (1984-07-01), Mases et al.
patent: 4461318 (1984-07-01), Brakelmann et al.
patent: 4483360 (1984-11-01), Knappe et al.
patent: 4605035 (1986-08-01), Rasmassen et al.
patent: 4655253 (1987-04-01), Ourensma
patent: 4687015 (1987-08-01), Mieth
patent: 4757834 (1988-07-01), Mieth
"Air-Actuated and Manual Compression Valves," 2-p. brochure TR-1101 8/83-3N, Tri-Canada, Inc., Mississauga, Ontario, Canada, believed to have been published on or around Aug. 1993 ( see 8/83 reference on face of brochure).
"Automatic Valves and Manifolds by Cherry-Burrell," Brochure #SB-1829, TA-10M-979P, Cherry-Burrell, Cedar Rapids, IA, undated, and no date is available. However, this is believed to be prior art with respect to the present invention.

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