Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Pressure gauge capable of automatically discharging air therefrom
 A pressure gauge has a housing unit which includes an air inlet, an air outlet, an air chamber communicated fluidly with the air inlet, and a pressure relief chamber communicated fluidly with the air chamber via a pressure relief passage and with the outlet via a check valve. An adjustment rod is threaded on the housing unit and can be rotated so as to move in the housing unit. A reed spring is carried on the adjustment rod by a spring carrier and pushes a ball to close the upper end of the pressure relief passage. When the air pressure of the air chamber exceeds a preset value which corresponds to the position of the adjustment rod relative to the housing unit, the ball is pushed upward to disengage from the upper end of the pressure relief passage so as to permit excessive air to flow from the air chamber to the outlet. Rotation of the adjustment rod relative to the housing unit can move the reed spring in the housing unit so as to vary the pressure of the reed spring applied to the ball, thereby adjusting the preset value. 
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Tien-Tsai
Huang