Pulse width modulated gas flow control valve

Details Pulse width modulated gas flow control valve Pulse width modulated gas flow control valve

1998-03-13

2000-02-01

Shaver, Kevin

Valves and valve actuation

Electrically actuated valve

Including solenoid

25112905, 335261, 335279, 335281, F16K 3102

Patent

active

060193476

ABSTRACT:
A gas flow control valve for quietly regulating the flow of a gas. The valve includes first and second coaxially oriented elongate tubes of magnetic material and an elongate sleeve of nonmagnetic material coaxially connecting the tubes. An electric coil assembly is disposed around the sleeve. A cover of magnetic material is provided around the coil and is in contact with the tubes. A nozzle opening is disposed within the first tube and has a valve seat encircling the nozzle opening. An elongate armature is axially slidably disposed within the sleeve and the first and second tubes and is moveable between first and second positions. The armature has a first end with an elastomeric seal member which abuts the valve seat when the armature is in the first position thereof to block the flow of gas. The armature further includes a gas flow passageway extending axially to a second end thereof. An elastically yieldable member is provided for continually urging the armature toward the first position thereof. The coil assembly, cover and the tubes are configured to effect a magnetically inspired axial movement of the armature, against the urging of the elastically yieldable member, to the second position and be magnetically stopped thereat, all in response to an electrical energizing of the coil assembly, to draw the first closed end away from the valve seat to a selected spacing to allow a sufficient pressure drop to occur across the spacing and a flow of gas through the valve. The magnetic stop and the elastomeric seal member effect a quiet opening and closing operation of the valve.

REFERENCES:
patent: 3993972 (1976-11-01), Barbrook
patent: 5032947 (1991-07-01), Li et al.
patent: 5560585 (1996-10-01), Krimmer et al.
patent: 5565832 (1996-10-01), Haller et al.

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