Position indicator apparatus for rising stem valve

Details Position indicator apparatus for rising stem valve Position indicator apparatus for rising stem valve

1991-11-08

1992-10-20

Chambers, A. Michael

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

251 611, F16K 3700

Patent

active

051561859

ABSTRACT:
A position indicator apparatus is provided for rising stem valves. The position indicator apparatus includes a switch having a rotatable switch post. The switch is operatively connected to a power source and to a signal, such that a circuit to the signal is selectively completed or broken depending upon the rotational orientation of the switch post. The switch is rigidly mounted in a selected position relative to a valve housing. A connecting beam extends from the switch post to the valve stem such that movement of the valve stem into or out of the valve housing causes a rotation of the switch post to complete the circuit to the signal for certain positions of the valve stem and to break the circuit to the signal for other positions of the valve stem.

REFERENCES:
patent: 1638325 (1927-08-01), Davis
patent: 3414012 (1968-12-01), Webb
patent: 3894557 (1975-07-01), Impett
patent: 3923475 (1975-12-01), Stenzel et al.
patent: 4338965 (1982-07-01), Garnjost et al.
patent: 4625758 (1986-12-01), Murray
patent: 4805665 (1989-02-01), League

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