Abstract: An improved shutoff valve has an inverted stem/seat design with a removable cartridge including a stem designed to include a high performance polymer tip for use with a compressed fluid cylinder. The high performance polymer tip reduces the likelihood of damage to the valve seating area of the shutoff valve. The removable cartridge with the high performance polymer tip thereon makes replacement quick and easy should the soft tip become damaged. The inverted stem/seat design positions the stem and high performance polymer tip such that the pressurized gas acts in unison with the threaded stem tip in seating the stem rather than acting against the stem.

Abstract: A ball-exchange trailer bitch system having a post for receiving a ball where the ball is removable from the post for exchangeability with different size balls. The system includes at least a double locking feature between the ball and post. The double lock consists of a side pin lock and a ball and cage lock. The system may also include a third lock which includes threads on the post and the ball.

Abstract: A ball-exchange trailer hitch system having a post for receiving a ball where the ball is removable from the post for exchangeability with different size balls. The system includes at least a double locking feature between the ball and post. The double lock consists of a side pin lock and a ball and cage lock. The system may also include a third lock which includes threads on the post and the ball.

Abstract: A thermal relief device releases gas from a storage cylinder when a thermal trigger senses a predetermined temperature threshold. The thermal relief device includes a valve body which has a passage for communication with the interior of the cylinder. A pilot valve assembly is disposed within the valve body and has a popper for blocking the flow path. The poppet has a longitudinal passage extending through the popper. A metal diaphragm sealing the passage of the poppet has a first side exposed to the interior of the cylinder and a second side opposite the first side exposed to the outlet. A hollow bayonet is mounted in alignment with the passage of the popper on the outlet side of the disk and is moveable between a first position and a second position. In the first position, the bayonet is spaced from the disk in the passage, and in the second position the bayonet pierces the disk. A spring is used to biased the bayonet toward the disk.