Pneumatic timer with eccentrically disposed valve needle

Details Pneumatic timer with eccentrically disposed valve needle Pneumatic timer with eccentrically disposed valve needle

G - Physics

05

G

74/2

G05G 21/00 (2006.01) H01H 43/28 (2006.01)

Patent

CA 1138228

PNEUMATIC TIMER WITH ECCENTRICALLY DISPOSED VALVE NEEDLE Abstract of the Disclosure A pneumatic timer for a timing relay is regulated by the axial movement of a valve needle through a chamber formed in the body of the timer. The valve needle forms a tapered valve stem along its longitudinal axis and the valve stem is eccentrically disposed in a passageway leading from the valve chamber to provide a crescent- shaped bleed area between the valve chamber and the interior of an expandable bellows. Springs are disposed in the valve chamber to bias the needle to its eccentric position, where the valve stem contacts a portion of a valve seat formed around the passageway. The size of the bleed area between the valve stem and the noncontacting portion of the valve seat changes as the valve needle is moved along its axis, but the shape of the bleed area remains substantially the same, so that the valve can more easily be set to provide the desired time delay.

343720

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