Controllable throttle for a vacuum pump

Details Controllable throttle for a vacuum pump Controllable throttle for a vacuum pump

1988-01-26

1989-02-14

Capossela, Ronald C.

Refrigeration

Low pressure cold trap process and apparatus

55269, 62268, 744248VA, 137601, 25112911, 251228, 417901, B01D 800

Patent

active

048038458

ABSTRACT:
A throttle valve with a separate flange, usable with a vacuum pump defining an inlet opening, and a controllable throttle assembly for varying a flow passage cross section of the inlet opening. The throttle assembly is disposed in the inlet opening and has a plurality of slats rotatable about respective longitudinal axes for varying their inclination and an actuating rod for turning the slats. The flange has a throughgoing bore through which the actuating rod passes. The slats have a substantially constant width and their longitudinal axes are oriented parallel to one another. The slats form a first and a second slat group, and a linkage connects the slats with one another for turning the slats of the first slat group and the slats of the second slat group in opposite directions. A chamber is situated externally of the inlet opening and communicates with the throughgoing bore. A pivotal lever articulated to the actuating rod is situated in the chamber and projects outwardly therefrom. There is further provided a swingable bellows supported in the chamber and surrounding the pivotal lever for providing an airtight separation of at least one part of the pivotal lever from the chamber.

REFERENCES:
patent: 3973590 (1976-08-01), Logsdon
patent: 4064934 (1977-12-01), Kolthoff, Jr. et al.
patent: 4341079 (1982-07-01), Bonn
patent: 4393896 (1983-07-01), Slabaugh
patent: 4457336 (1984-07-01), Allan et al.
patent: 4475349 (1984-10-01), Batzer et al.
patent: 4479361 (1984-10-01), Osher
patent: 4493342 (1985-01-01), Bachmann
patent: 4531372 (1985-07-01), Slabaugh

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