Pressure monitoring isolating device

A pressure monitoring isolating device for monitoring the pressure of fluid in a pipeline comprising:

• an annular housing having an outer periphery and being axially insertable in said pipeline, ,said annular housing having a central opening through which said fluid in said pipeline flows, said central opening defining an inner diameter of said annular housing;
• a flexible sleeve member secured to said annular housing around said central opening thereof, said sleeve member having inner and outer surfaces;
• an annular fluid chamber positioned around and in communication with said outer surface of said sleeve member;
• a sensing fluid cavity extending radially from said annular fluid chamber toward said outer periphery of said annular housing, said cavity having a free end;
• a sensing fluid filling said annular fluid chamber and said sensing fluid cavity;
• means for sealing said free end of said sensing fluid cavity, said sealing means including an elastomeric member located adjacent said free end of said sensing fluid cavity and having a bore passing substantially entirely therethrough, and
• a pressure gauge assembly and means for releasably securing said pressure gauge assembly to said sensing fluid cavity, said pressure gauge assembly including a hollow needle extending therefrom and a pressure gauge for monitoring the pressure of said fluid, said needle extending into said sensing fluid cavity through said bore in said elastomeric member,
• said bore in said elastomeric member having a diameter smaller than the diameter of said needle, said elastomeric member having restoring forces which cause said bore to seal when said needle of said pressure gauge assembly is removed therefrom.