Control valve having an actuating drive and method therefor

Details Control valve having an actuating drive and method therefor Control valve having an actuating drive and method therefor

1996-04-23

1997-09-23

Hepperle, Stephen M.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

13763015, F16K 3140

Patent

active

056694130

ABSTRACT:
A valve apparatus for controlling a pressured fluid, in which the shut-off device is force closed by the pressured fluid which is admitted into a chamber via a throttle bore. The valve is opened via a drive means, which acts directly on both a pilot valve and on the shut-off device, without the interposition of an actuating fluid. The drive means first opens a pilot valve, thereby allowing the pressured fluid to escape from the chamber and to the outlet. The drive means then opens the shut-off device. The reduction in pressure in the chamber enables a drive means of only moderate power to complete the second step of opening the shut-off device. The drive means acts directly on the shut-off device; thus the control action corresponds directly to the stroke displacement of the drive means at any particular moment.

REFERENCES:
patent: 2345306 (1944-03-01), Van Der Werff
patent: 3213887 (1965-10-01), Angelery
patent: 3447568 (1969-06-01), Burkart
patent: 3752189 (1973-08-01), Marr
patent: 3817053 (1974-06-01), Orth
patent: 3850196 (1974-11-01), Fales
patent: 4176688 (1979-12-01), Schwerin
patent: 4809742 (1989-03-01), Grau
patent: 4995586 (1991-02-01), Gensberger et al.
patent: 5172722 (1992-12-01), Nishimura
patent: 5197508 (1993-03-01), Gottling
Thermostatische Expansionsventile; Acal Auriema.
"Evaporator Pressure Regulating Valves" Apr. 1995/Bulletin 90-20-1; pp. 1 and 2.
"Danfoss pilotgesteuerte modulierende Regler Qualitat . Flexibilitat Zuverlassigkeit"; PM Pilotgesteuerte Hauptventile; Refrigeration Controls.

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