Fluid pressure regulator

A fluid pressure regulator capable of adjustably setting a pre-selected cut-off pressure, the pressure regulator comprising:

• a piston having a piston body with a piston face on an upper surface thereof, with side walls and with a lower surface and further having a piston stem with a removed first end having walls defining a stem face and a second end;
• a first valve body having an inner wall surface defining a first chamber, the first chamber walls defining a high pressure port, defining a low pressure port and further having walls defining a stem receiving member dimensioned to maintain the stem face of said piston opposite one of said high pressure or low pressure ports;
• a second valve body having walls defining a piston head chamber for receipt of said piston head therein;
• first sealing means for providing a substantially fluid tight seal between the outer walls of the piston stem and the walls of the stem receiving member of said first valve body;
• second sealing means for providing a substantially fluid tight seal between the head of said second valve body and the side walls of the piston body;
• first bias means for engaging said second valve body and the piston body to urge the stem of said piston away from the high pressure port;
• means for providing fluid communication between the first chamber and the piston head chamber;
• valve seat located between the stem face of said piston stem and one of said high pressure or low pressure ports of said first valve body;
• and
• coupling means capable of adjustably engaging said first and said second valve bodies to vary the distance between the stem face of said piston stem and said first valve body;
• wherein adjusting said coupling means to increase the distance between the stem face and the first valve body will increase the cut-off pressure and decreasing the distance will decrease the cut-off pressure.