Abstract: A valve assembly includes a valve body having a passageway and first and second oppositely facing valve seats that extend around the passageway. First and second valve elements are positioned in the passageway to seal against the respective valve seats, and a spring biases the first valve element to the closed position against the first valve seat. The valve seats are spaced sufficiently closely together along the passageway that the first valve element, when positioned against the first valve seat, holds the second valve element away from the second valve seat. For this reason, the spring also biases the second valve element away from the second valve seat.

Abstract: A combination thermal and pressure relief valve is disclosed that includes a first housing having an opening at a first end and a pathway extending towards the opening from a second end of the first housing. A second housing is partially received in the opening of the first housing, and the first and the second housings define a chamber adjacent the pathway. An exitway extends from the chamber to an exterior of the valve. A bearing element is within the chamber adjacent the pathway and is larger than a width of the pathway. A spring is within the chamber, is under compression, and in line with the bearing element. A thermal element is also within the chamber and in line with the spring. The thermal element melts at a predetermined temperature. The spring exerts a force on the bearing element such that the bearing element is biased against the pathway and forms a seal between the chamber and the pathway.

Abstract: A valve assembly includes a valve body having a passageway and first and second oppositely facing valve seats that extend around the passageway. First and second valve elements are positioned in the passageway to seal against the respective valve seats, and a spring biases the first valve element to the closed position against the first valve seat. The valve seats are spaced sufficiently closely together along the passageway that the first valve element, when positioned against the first valve seat, holds the second valve element away from the second valve seat. For this reason, the spring also biases the second valve element away from the second valve seat.