Abstract: A hydraulic accumulator or pulse dampener device susceptible of being repaired by replacing the bladder assembly through a removable gas charging valve. The device is characterized by a structure connecting the bladder assembly to elements of the gas charging valve assembly whereby a secure connection between the parts may be effected without damaging the bladder.

Abstract: A cryogenic device utilizing pressurized coolant gas and provided with a single control easily manipulatable by finger pressure to selectively furnish either continuous freezing or continuous thawing, each alone or in sequence. The expansion chamber is pressurized only when the control lever is deliberately held depressed and, in consequence, either the expansion chamber or the coolant inlet subassembly can be detached or exchanged without risk to the operator or the equipment and without need for closing off the coolant supply. A pressure regulator forming a part of the device limits the maximum possible pressure in the expansion chamber and exhaust passages to a safe value. The device is substantially noiseless in operation and the control is operable through first and second stages by movement in the same direction to provide freezing or warming modes at the user's option and is self-locking in the freezing mode but is automatically disengaged therefrom upon movement into the thawing mode.

Abstract: A silencer-separator having a cylindrical casing of circular cross section which is divided into an upper separator chamber and a lower expansion chamber. An inlet pipe directs a gas stream into the expansion chamber, and a pair of angularly disposed tubes direct the gas upward through a divider into the separator chamber with a swirling motion along the interior wall surface. A tubular central outlet extends through the upper end closure and has an entrance a substantial vertical distance therebelow. A peripheral baffle adjacent the interior wall collects entrained particles in the separator section and the collected particles are drained through a tube that may lead to the bottom of the expansion chamber. A perforated cylindrical body filled with a noise-attenuating fibrous substance is coaxially supported within the central outlet.