Abstract: The invention relates to a pressure regulator for propane and liquefied petroleum with a balanced valve. An inlet port (10) receives supply pressure and an outlet port (14) receives output pressure. A threaded shaft (28) engages a pocket in a spring button (20). A diaphragm assembly (22) engages the bottom of a range spring (24). A T-handle (26) is rotated to move the spring button (20) downward, compressing the range spring (24) which creates a net downward force on the diaphragm assembly (22). A valve mechanism (12) includes a supply seat (30), a supply valve (34), a balance piston (32), and a pintle interconnection (36). The supply valve (34) moves off of the supply seat (30) as the downward force is exerted on the diaphragm assembly (22), and supply pressure fills the outlet port (14).

Abstract: An electro-pneumatic transducer converts an electrical input signal into a proportional (direct or indirect) pneumatic output signal. A circuit will sense the magnitude of the input signal, monitor the output fluid pressure and adjust a piezoelectric beam voltage until a desired output fluid pressure is achieved. The output fluid pressure is controlled by the deflection of a piezoelectric beam which is polarized and will deflect with an applied voltage. The output fluid pressure is monitored by a pressure sensor.