Connection fitting device with clean-out

Claim 1

A connecting fitting unit for connecting a pressure indicating device with a source of pressurized fluid, the fitting having means manually operable to clean out and maintain a connecting passage in the fitting free of any occluding media carried by the pressurized fluid, comprising: a. a generally Y-shaped hollow body structure, including: a straight body portion with a mounting connection at one end, and an integrally formed lateral branch body portion with a mounting connection at its outer end for a pressure indicating device; an aerial bore in said straight body portion including a fIrst bore portion of uniform diameter in communication with said one end of the body and said lateral branch portion, an enlarged second bore portion of uniform diameter in communication with the other end of said body portion, and an annular flange in the bore wall between the inner ends of said bore portions defining a restricted passage between the bore portions; b. a cleaning plunger reciprocable in said first bore portion having an elongate stem at its inner end extending through said restricted passage and outwardly beyond the other end of said body portion; c. a compression coiled spring surrounding said stem with its inner end restrained by said annular flange and its outer end being restrained by an abutment carried by the outer end of the stem, said spring acting to normally position said plunger in said first bore portion so as to enable unobstructed communication with said branch body portion, but being manually movable towards said one end against the pressure of said spring to effect a clean-out operation in said first bore portion; and d. means for sealing said stem in respect to said restricted passage.