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Dynamic Testing of Pressure Differential Switches

IP.com Disclosure Number: IPCOM000078841D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Ernst, JR: AUTHOR [+2]

Abstract

Pressure operated electrical switches are life and marginally tested by repeatedly supplying pressure pulses.

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Dynamic Testing of Pressure Differential Switches

Pressure operated electrical switches are life and marginally tested by repeatedly supplying pressure pulses.

Pressure pulses are supplied from a rotating valve at times indicated by the breaking of a light beam to a photodiode. The witches being tested and the photodiode outputs may be connected to a computer for analyzing the occurrence, frequency, and distribution of pressure switch failures. The rotating valve includes a stationary piece through which pressure is applied and a rotating shaft, carrying a rotor, connected to a pressure outlet by a hollow rotor shaft and connecting passage. The rotor shaft is supported with ball bearings at each end and is driven at one end by a variable-speed motor.

There is a set of holes, connected to a pressure switch, in the outer dimension of the rotor. As the rotor is turned in the stationary piece, the holes pass under spring loaded plungers. While the holes are passing under the plungers, they line up with slots in the plunger to a switch being tested. The pressure in the passages is returned to atmosphere while the holes are between the plungers.

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