Pilot-type channel valves providing counter-flow prevention

An apparatus comprising:

• a thermally-conductive pipe body defining a hollow interior,
• a first valve disposed within the hollow interior and comprising:
• a first valve seat fixedly disposed within the hollow interior and having a hole defined therein,
• a first movable valve slidably disposed within the hollow interior and having a pilot hole defined therein, a first seal disposed on a first side of the first movable valve and surrounding the pilot hole, and a second valve seat disposed on a second side of the first movable valve and surrounding the pilot hole,
• a movable pilot valve having a second seal arranged and constructed to contact the second valve seat and close the pilot hole,
• a first spring biasing the movable pilot valve towards the first movable valve and the first valve seat, and
• a solenoid arranged and constructed to bias the movable pilot valve away from the first movable valve when energized, and
• a second valve disposed within the hollow interior proximally to the first valve, such that heat generated by energizing the solenoid is conducted via the thermally-conductive pipe body to the second valve, the second valve comprising:
• a second movable valve slidably disposed within the hollow interior and having a third valve seat,
• a third seal fixedly disposed within the hollow interior and having a hole defined therein, the third seal being arranged and constructed to stop a flow of fluid through the pipe body when the third valve seat contacts the third seal, and
• a second spring biasing the second movable valve towards the third seal,
• wherein the first valve has a first valve opening direction, the second valve has a second valve opening direction, and the first valve opening direction is opposite of the second valve opening direction with respect to the direction of fluid flow through the pipe body.