Pressure accumulator with failure indicator

Claim 1

An accumulator device comprising, in combination, a pressure resistant shell having an oil port at one end and a gas charging port at the other end, a resilient, distensible bladder member supported in said shell including a mouth surrounding said gas charging port, said bladder dividing the interior of said shell into first and second chambers, respectively communicating with said oil and said gas ports, a plug member mounted in said gas charging port, said plug member including a laterally directed flange portion, said mouth of said bladder surrounding said flange portion and being clampingly urged by said flange against inner surface portions of said shell surrounding said gas charging port, said plug member having a bore portion substantially axially aligned with the major axis of said shell, the diameter of said bore portion being substantially greater at its outer end than at its inner end, said inner end defining a restricted flow passage into said second chamber, said plug member including a gas charging valve mounted in said plug member and communicating with said second chamber, and liquid sensing means mounted in the outer end of said bore portion and communicating with said second chamber for sensing the ingress of liquid into said second chamber, said bladder including first and second apertures respectively communicating through said gas valve and restricted flow passage with said second chamber.