Pressure regulator of liquefied-gas fuel system for internal combustion engines

A pressure regulator for a liquefied-gas fuel system in an internal combustion engine comprising:

• a. a regulator body forming a space partitioned into three chambers;
• namely,
• i. a pressure-regulating chamber communicating with a liquefied-gas fuel source and a carburetor, said pressure-regulating chamber having a fuel inlet passage communicating with said liquefied-gas fuel source, and a fuel outlet passage communicating with said carburetor;
• ii. a back-pressure chamber communicating with the atmosphere;
• and
• iii. a suction-pressure chamber communicating with an intake system of said engine by an intake port coupled to an intake manifold such that a vacuum is selectively formed in said suction-pressure chamber;
• b. a first diaphragm forming a boundary between said pressure-regulating chamber and said back-pressure chamber;
• c. a second diaphragm forming a boundary between said back-pressure chamber and said suction-pressure chamber;
• d. a first spring mounted in said suction-pressure chamber, said first spring disposed against said second diaphragm and said pressure-regulating body adjacent the bottom thereof;
• e. a screw adjustment means secured in said first diaphram for selectively engaging said second spring and limiting the downward movement thereof;
• f. a second spring mounted in said back-pressure chamber, said second spring disposed against said first and second diaphragms;
• g. a fuel regulating valve disposed in said fuel inlet passage of said pressure-regulating chamber;
• and
• h. an actuating lever having first and second ends, said first end operatively connected to said fuel regulating valve and said second end operatively coupled to said first diaphragm, said actuating lever disposed in said pressure-regulating chamber such that when said first diaphragm is disposed downward, said first end of said lever is caused to deactuate said regulating valve thereby decreasing the amount of fuel supplied to said pressure-regulating chamber, and when said first diaphragm is disposed upward, said first end of said lever is caused to actuate said regulating valve thereby increasing the amount of fuel supplied to said pressure-regulating chamber,
• said first and second springs are arranged and configured in said pressure-regulator such that for predetermined pressures in three chambers, said actuating lever is caused to selectively regulate the fuel supplied to said pressure-regulating chamber.