Prepackaged guard device sub-assembly for pressure responsive instruments

Abstract From the Canadian patent

Abstract of the Disclosure, A prepackaged pressure responsive diaphragm sub-assembly of the flange type for isolating a pressure sensitive instrument from the source of fluid pressure at a connection with which the instrument is to be utilized. Comprising the sub-assembly unit is an annular diaphragm retained prepackaged in operative relation sandwiched between a housing and an open ended sleeve having an end face adapted for gasket sealed installation with a matchup sleeve provided by the end user. Securing the assembly are L-shaped fasteners supported in an annular flange mounted about the housing and gripping a shoulder formed on the sleeve. Displaced in the flange from the fasteners are …