Valve device

A valve device comprising:

• a first valve body being hollow and including an opening;
• a second valve body arranged within the first valve body and being movable relative to the first valve body, wherein the second valve body includes a projection projecting from the opening of the first valve body;
• a valve chamber housing the first valve body and including an opening;
• a first valve seat arranged around the opening of the valve chamber, wherein the first valve body contacts the first valve seat;
• a second valve seat arranged around the opening of the first valve body, wherein the second valve body contacts the second valve seat;
• a spring biasing the second valve body toward the second valve seat;
• a piston applying a force to the second valve body by contacting the projection of the second valve body such that the second valve body is separated from the second valve seat;
• a movement restricting member fixed to the first valve body and restricting a movement of the second valve body in an axial direction relative to the first valve body;
• and
• a rotation restricting member restricting rotation of the first valve body relative to the second valve body.