| 摘要 |
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. A bearing or bushing is nested within the plug bore and axially and guidably receives the piston rod. The improvement resides in the bushing or bearing having a depending tapered boss of reduced diameter with an annular inclined surface extending downwardly and inwardly at an acute angle, therebeing a counterbore in the bushing and axially of the boss. A cylindrical slide seal of plastic material is nested within the plug bore and projects into the counterbore and boss 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 and in compressed operative registry with the boss and in operative retaining registry with the seal.
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