Valve stem driving apparatus

Details Valve stem driving apparatus Valve stem driving apparatus

1992-06-05

1993-07-06

Rivell, John

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

137553, 137552, 25112911, 2512495, 744248VA, 73162, F16K 3700

Patent

active

052245128

ABSTRACT:
A valve stem driving apparatus comprises a valve stem which has first and second ends, the second end being connected to a valve body. The valve stem is engaged with a stem nut. A distance measuring device is provided in an upper cover for the valve stem and measures a distance between the upper cover and the first end of the valve stem, so that wear rate of the valve stem and/or the stem nut is determined.

REFERENCES:
patent: 2818687 (1959-03-01), Kron et al.
patent: 2917069 (1959-12-01), Lundy et al.
patent: 4299251 (1981-11-01), Dugas
patent: 4545406 (1985-10-01), King
patent: 4821769 (1989-04-01), Mills et al.
patent: 4833453 (1989-05-01), Twerdochlib

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