Tech Team LLC

Frederick W Hensel

John H Parnell

Stephen J Boros

Steve D Sandstrum

Mark F Hensel

John Coleman

A combination differential and static pressure switch utilized in a test system for detecting the occurrence of a differential pressure condition within the test system. The test system includes a valve assembly in flow communication with the pressure switch for determining the working pressure applied to a workpiece being tested. The pressure switch includes a first tubular-shaped member and a second tubular-shaped member axially aligned therewith and adapted for removable securement to the first tubular-shaped member. A differential piston is disposed for slidable reciprocal movement within the first tubular-shaped member and a preset piston is disposed within the second tubular-shaped member and is adapted for slidable reciprocal movement therein. Both pistons are axially aligned to each other, and the differential piston has a magnet mounted to the face end thereof. An elongated passage extends substantially into and through the second tubular-shaped member and a cylindrical support member is adapted for removable and adjustable placement within the passage. A reed switch is emplaced within the support member and is actuated by the proximity of the magnetic field of the magnet. The reed switch is actuated to a signaling, conducting state when the magnetic field is proximate thereto; and when a differential pressure occurs within the test system, the differential piston backs away from the preset piston upon detecting the differential pressure, thus disposing the reed switch to a nonsignaling state indicating that the workpiece has failed the test.

Combination differential and static pressure switch

A hydrostatic test system for subjecting a workpiece or test specimen to a predetermined test pressure until the workpiece fails by developing a leak detectable by the test system. The hydrostatic test system is a modular system readily adaptable to, and able to incorporate therein, a number of different physical devices for regulating, controlling, detecting, and registering functions and activities pertaining to leak detection. Among the devices adaptable in the hydrostatic test system for detecting a leak condition in the workpiece is a differential pressure switch and a static pressure switch, a combination differential and static pressure switch, or an accumulator associated with either a pressure transducer or a high accuracy transducer. The leak condition may be visually signaled by a lamp or indicator light or the sensing of a leak condition may be visually output to a CRT screen. The hydrostatic test system includes a number of test stations mounted in a large upright cabinet or unit, with each test station accommodating one test specimen. The aggregate failure times and pressures can be output and displayed on a plotter and printer in the computer-controlled embodiment of the hydrostatic test system.

Growing community of inventors

Butler, PA, United States of America

Frederick W Hensel