Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-07-17
1992-08-25
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137542, 251256, F16K 1706
Patent
active
051410249
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a valve, by which is meant any device, such as a tap, which is adapted to control the flow of a fluid (gas or liquid) through a supply or discharge line therefor.
The commonest examples of valves currently available employ a screw-thread, which additionally interconnects the components of the valve and is often used solely for this purpose.
There are applications, however, where it is not necessary or where it is actually undesirable that there should be a screw-threaded connection. In mass production the provision of a screw-thread is relatively expensive. It cannot be made by the simplest moulding operation involving the removal of a (fixed) die from a mould because the opposed sides of the screw-thread in the mould would prevent this. A collapsing or rotating die has to be used to produce a screw thread in a plastics material. Alternatively if the screw thread is provided in metal components it is produced by precision cutting. In addition to being relatively expensive to manufacture a screw-threaded device does not lend itself to automated assembly techniques because the components must be precisely aligned and relatively rotated.
One object of the present invention is to provide a valve which is more economical to manufacture and to assemble than one employing a screw thread.
In accordance with the present invention there is provided a valve comprising a tubular housing having a valve seat therein, a valve member control element having a generally cylindrical periphery which is a sliding and rotational fit within the tube, a cap covering the end of the tubular housing remote from the valve seat, said cap engaging the housing so as to be manually rotatable but not axially displaceable relative thereto and means being provided interengaging the cap and the control element whereby the control element is axially displaceable but non-rotatable relative to the cap, the housing and the control element being provided with a plurality of concentric pairs of opposed helical ramp means of different diameters, the ramp means of each pair being of similar diameter and opposed to one another axially of the housing and oppositely arranged whereby sliding contact between the ramp means as the control element is rotated will cause axial displacement of the latter toward or away from the valve seat, adjacent pairs being angularly offset about the axis of the housing, a compression spring means being entrapped between the cap and the control element to bias the latter toward the valve seat and the two ramp means of each pair being of similar, constant pitch and are configured to provide sliding contact between continuous surfaces, or between a continuous and a discontinuous surface of the ramp means of each pair when the control element and housing are relatively rotated.
Said pairs of ramp means may be two in number and may be angularly offset 180.degree..
Alternatively opposed faces of the housing and of the control element may be provided each with more than two helical ramp means of differing diameter, each said ramp means of one component being paired with a similar ramp means of the other component and each pair of ramp means being angularly offset with respect to the or each adjacent pair according to the formula: ##EQU1##
The control element may have an axial bore in which a stem of a valve member is axially slidable, the valve member having a head at one end of the stem between which head and the control element a compression spring is located to bias the head of the valve member into contact with the valve seat, the arrangement being such that axial displacement of the control element within the housing adjusts the pressure of the spring loading under which the head of the valve member is held on the valve seat.
Any one of said ramp means of each pair thereof may be discontinuous, being constituted by angularly separated abutments the surfaces of which presented to the other ramp means of the pair all lie on a helix of pitch and diameter similar to those of said other ramp means.
Embo
REFERENCES:
patent: 2521166 (1950-09-01), Hinrichs
patent: 4762145 (1988-08-01), Stradella
Intersurgical Limited
Nilson Robert G.
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