Abstract: Cryogenic fluid piston pump functions as stationary dispensing pump, mobile vehicle fuel pump etc., and can pump vapour and liquid efficiently even at negative feed pressures, thus permitting pump location outside a liquid container. Piston inducts fluid by removing vapour from liquid in an inlet conduit faster than the liquid therein can vaporize by absorbing heat, and moves at essentially constant velocity throughout an induction stroke to generate an essentially steady state induction flow with negligible restriction of flow through an inlet port. Stroke displacement volume is at least two orders of magnitude greater than residual or dead volume remaining in cylinder during stroke changeover, and is greater than volume of inlet conduit. Cryogenic tank has a liquid compartment, a vapour compartment, and inlet and overflow conduits. Inlet conduit receives liquid from dispensing pump and widely disperses liquid into liquid tank to contact and condense vapour.

Abstract: An apparatus for purifying and liquifying an input gas containing natural gas and air. The apparatus comprises a plurality of molecular sieve assemblies operatable to clean the gas on a gas cleaning mode and to be regenerated on a heating mode and a cooling mode. A first assembly cleans the gas while a second sieve assembly is being regenerated. A three position valve associated with each molecular sieve assembly changes the modes of the sieve assemblies. A two position valve supplies hot air for heating the sieve assemblies during the heating mode, supplies cool air for cooling the sieve assemblies when the sieve assemblies are at a temperature above 400.degree. F. and supplies cool gas for cooling the sieve assemblies when the sieve assemblies are at a temperature below 400.degree. F.

Abstract: An apparatus and a process for cleaning and liquifying an input gas. An engine operates on a portion of cleaned gas and discharges exhaust gases. A heat exchanger transfers heat from the exhaust gases to the portion of the cleaned gas. Apparatus for liquifying the cleaned gas is powered by the engines. Molecular sieves clean the input gas to produce the cleaned gas and are regenerated by the portion of the cleaned gas.