Measuring and testing – Fluid pressure gauge – Piston
Patent
1979-04-18
1980-04-29
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Piston
G01L 716
Patent
active
041999924
ABSTRACT:
The pressure indicator has a body provided with an attachment shank having a pressure fluid passage. A cylinder bore is located at one end of the body communicating with the passage and has a threaded open end. An end plug having a bore and a counterbore is snugly threaded into the open end. A piston is nested in the cylinder bore and has a piston rod axially extending through the cylinder bore and projecting through and outwardly of the plug. A compression spring is interposed between the plug and piston and yieldably biases the piston towards said one end of the cylinder bore. The piston is variably movable longitudinally against the spring on application of pressure to the shank passage. The improvement resides in the provision of a bushing nested within the plug bore which axially and guidably receives the piston rod. A cylindrical slide seal of plastic material is nested within the plug bore and projects into and depends from the bushing in sealing engagement with the piston rod. An O-ring in the plug bore is sealingly interposed between the plug and the slide seal. The piston and bushing are of different material to eliminate binding therebetween. A modification includes a shut-off needle valve mounted on the body.
REFERENCES:
patent: 3286726 (1966-11-01), Guy
patent: 3677089 (1972-07-01), Martin
patent: 3910120 (1975-10-01), Martin
J. E. Myles, Inc.
Woodiel Donald O.
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