Gas taps
AssigneeEwarts Limited
InventorStephen Hayes
Life of this patent
Estimating the term…
Abstract
The invention provides a gas tap particuarly intended to be made of aluminium, using an axially movable plunger to control flow, in which the tip of the plunger is modified for low rate flow control, by providing a low rate flow passage in the tip of the plunger.
Claims11
A gas tap comprising a body provided with a flow passage including successive sections of differing diameter, a plunger which has a tapered nose portion and is mounted for axial movement along said flow passage to control the flow rate of gas through said passage, and an O-ring carried by the plunger and encircling the same at a position adjacent the tapered nose portion, the plunger being movable, from a closed position in which the tapered nose portion is received within the smaller diameter section of the flow passage and the O-ring is located wholly within and sealingly engages the wall of said smaller diameter section, to an open position in which the nose portion extends into the smaller diameter section and the O-ring is located within the larger diameter section, the plunger being provided with a formation extending from the tip of said nose portion towards the O-ring, which formation affords communication between said successive flow passage sections when the plunger is in said open position, and is constituted by a passageway formed in the plunger, said passageway opening at the tip of said nose portion and also at a point on the periphery of the plunger between the O-ring and the tip of the nose portion.
A gas tap according to claim 13 in which said plunger is further movable beyond said open position to a fully open position in which the tapered nose portion, and hence the O-ring, is withdrawn from the smaller diameter section into the larger diameter section.
A gas tap comprising a plunger which is movable axially in a body bore to control the rate of flow through the tap, a tapered nose on the plunger which is co-operable with a flow passage in the tap body, an O ring sealing the plunger to the body bore to provide a final closing seal in an "off" position of the tap, said nose being adapted to provide a finely controlled low flow rate, a pair of O rings which seal the plunger to said flow passage, and a low rate flow passage extending through the said nose from the tip thereof and opening between the said two O-rings.
Dependencies are inferred from the claim text.