High pressure and temperature valve

A valve comprising:

• a valve body (220);
• a first piston (210) fixedly connected to a second piston (212) within the valve body, the first piston and second piston disposed at opposite distal ends of the valve body;
• a first biasing member (270) urging the first piston (210) closed and a second biasing member (260) simultaneously urging the second piston (212) open;
• an inlet (242) in fluid communication with an outlet (234) when the first piston (210) is closed and the second piston (212) is open;
• the second piston (212) is closed and the first piston (210) is open upon application of a fluid pressure sufficient to overcome the cumulative force of first biasing member (270) and the second biasing member (260) when the fluid pressure is applied to the second piston (212) through a fluid inlet (232);
• and
• the first piston (210) when open causes a second inlet (244) to be in fluid communication with the inlet (242) and causes the second piston to close outlet (234).