| 摘要 |
Apparatus for communicating pressure from an external fluid to a pressure-sensitive tool comprises a housing (14) which is connectible (at 20) to the pressure-sensitive tool and receives the external fluid at inlets (30). The housing has a filter cartridge (16) mounted within it to communicate a pressure from an external fluid to a clean fluid (43) contained within the filter cartridge and the tool. The filter cartridge includes one or more filters (52,64) having a plurality of passageways small enough to hold the clean fluid under pressure equilibrium conditions, but large enough to communicate pressure from the external fluid to the clean fluid. There are enough of such passageways so that it is unlikely that all will become clogged by any contaminants within the external fluid should a portion of the external fluid be sucked in through the filter in response to expansion and contraction phenomena of the clean fluid. |
