Needle valve

Details Needle valve Needle valve

1985-02-08

1986-03-11

Scott, Samuel

Valves and valve actuation

With material guide or restrictor

Movable or resilient guide or restrictor

74441, 251903, F16K 4700

Patent

active

045750432

ABSTRACT:
A needle valve having improved accuracy and wear characteristics is disclosed in which the valve stem is subjected to a constant force to prevent backlash throughout its entire movement with respect to the valve seat. In addition, the needle contained within the valve stem has a tapered end which moves within the cylindrical bore in a valve seat to control fluid passing through the valve and such needle is affixed to the valve stem only at its other end remote from its tapered end. The needle thus floats for a substantial portion of its length and its tapered end is relatively flexible and free of movement. The needle is, however, angled with respect to its valve seat such that the needle physically makes contact with the internal surface of the valve seat and maintains that contact throughout its lateral movement within the valve seat.

REFERENCES:
patent: 903114 (1908-11-01), Snell
patent: 1988819 (1935-01-01), Stuart
patent: 2607826 (1952-08-01), Barnes
patent: 3084865 (1963-04-01), Fleer et al.
patent: 4099703 (1978-07-01), Lush

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