Patent ID: 7216813

Claim:
A kit, comprising a retrofittable pressure gauge and a valve bushing of a spreader valve or a trigger operated fluid valve of a spray gun; wherein said pressure gauge comprises: a case having a pressure chamber; a pressure sensor located in the pressure chamber; and a mounting fixture attached to the case and having a through bore for mounting the pressure gauge at the spreader valve or the trigger operated fluid valve of the spray gun, wherein the mounting fixture further comprises a passageway other than said through bore, said passageway providing fluid communication between the pressure chamber and the through bore; wherein said valve bushing has a first section sized to be passable through said through bore and a second section sized to be not passable through said through bore, said second section defining a shoulder engageable with one of two opposite end surfaces of said mounting fixture when the first section of said valve bushing is received in the through bore; wherein said through bore extends between said opposite end surfaces and has an opening on each of said opposite end surfaces, and an entire axial extent of said through bore between said opposite end surfaces is smaller than an axial dimension of said first section of said valve bushing; wherein, when said first section is inserted into said through bore until the shoulder defined by said second section comes to rest on said one of said opposite end surfaces of the mounting fixture, said first section extends entirely through said through bore and projects beyond the other one of said opposite end surfaces; wherein, when the first section of said valve bushing is received in the through bore, the first section is radially spaced from an inner wall of said through bore, thereby defining between said bushing and said through bore an annular channel which, when the valve bushing is fitted into the spray gun, allows fluid communication between a pressurized interior space of the spray gun and the passageway, and hence, the pressure chamber; and wherein said valve bushing is hollow and further includes a tubular sidewall surrounding an inner space of said valve bushing; and a through hole in a middle region of said tubular sidewall, thereby providing fluid communication between the inner space of said valve bushing and the pressure chamber via said passageway and said annular channel.