There is provided a flow-blocking safety valve to prevent an explosion of a portable gas container, wherein, when the portable gas container overheats during use and the temperature rises above a predetermined level, a bridge hold supporting a pin of the safety valve melts and thus a pin or ball securely supported in the bridge holder becomes free to move to close a flow channel through which the gas flows, thereby blocking the gas discharge and preventing an accident occurring when the gas container bursts by overheating.

A safety vacuum supply gas cylinder includes a cylinder body, a pipeline structure, first and second check valves (respectively having first and second check valve opening pressures P.sub.c1, P.sub.c2, wherein P.sub.c1 is greater than an atmospheric pressure P.sub.0). The cylinder body has an opening and an internal space configured to store a gas, wherein the gas forms an internal pressure P.sub.2 smaller than P.sub.0. The pipeline structure, communicated with the opening, has first and second pipelines where the first and second check valves are respectively arranged. An external filling gas enters the cylinder body when a pressure of the external filling gas is greater than P.sub.c1 and P.sub.2. The gas flows out when P.sub.2 is greater than P.sub.c2 and an external environmental pressure.

Regulator assemblies can be tested using test fluids selected to have a molecular weight about that of a selected fluid to be dispensed from a fluid storage and delivery vessel including the regulator assembly. The test fluid can be a single gas or a mixture. The test fluid can have a molecular weight of between 80% and 110% of the molecular weight of the selected fluid dispensed from the fluid storage and delivery vessel. Regulator assemblies tested in this manner can pass evaluation when they show fewer than two spikes on the initiation of flow of the test gas. These regulator assemblies can be installed into fluid storage and delivery vessels, particularly for storage and delivery of pressurized fluids.

The present disclosure provides systems and methods for refilling fluid containers. A fluid container may include a bottle and a valve assembly. The valve assembly may include two valves and be configured to engage with the bottle and a filling head or dispensing head. A system is configured to provide pressurized fluid to the refillable container, monitor filling, determine when to stop filling, and determine how much fluid was provided. The valve assembly may include a float mechanism coupled to one of the valves of the valve assembly to ensure fluid flow is stopped when the fluid container is full. The fluid, which can include carbon dioxide, is stored in a storage tank. A flow system provides the fluid to a filling head, which engages with the fluid container. The flow system includes a transfer pump, valves, and sensors configured to provide the fluid to the filling head.

A screw compressor includes a hollow casing inside which a reservoir for air and oil is realized and on which, in an upper position, a suction group for air from outside the reservoir having at least an air intake valve and at least an air filter; on one lateral end a flow block provided with an oil/air separation device and an oil filter and at least a valve for extracting compressed air are disposed. The casing is provided with an opening on the opposite side with respect to that on which the flow block is provided. The compressor includes a casing closure flange to which a screw compression unit is fixed that when the flange is placed to close the opening causes the insertion into the reservoir of the unit.

The invention relates to a tank device (1) for storing a gaseous medium, in particular hydrogen, comprising at least one tank reservoir (3), wherein said at least one tank reservoir (3) comprises a tank housing (30) having a tank neck (2). Furthermore, a tank pressure bottom (8) is arranged in the tank neck (2), which tank pressure bottom (8) separates a tank neck space (7) and a tank interior (6) from one another, and wherein said tank neck (2) has an outer thread (10) as an abutment on an outer side (20).

A gas storage and dispensing container includes a storage vessel, a first gas pressure regulator, and a second gas pressure regulator. The storage vessel is configured to contain a pressurized gas. The gas storage and dispensing container has a discharge flow path for discharging the pressurized gas. The first gas pressure regulator is disposed within the storage vessel, and the second gas pressure regulator is external to the storage vessel. The discharge flow path extends through the first gas pressure regulator and the second gas pressure regulator. A method of discharging gas from a gas storage and dispensing container includes a first gas pressure regulator reducing a pressure of the pressurized gas to a first pressure and a second gas pressure regulator reducing the pressure of the pressurized gas to a second pressure.

The present disclosure provides systems and methods for refilling fluid containers. A fluid container may include a bottle and a valve assembly. The valve assembly may include two valves and be configured to engage with the bottle and a filling head or dispensing head. A system is configured to provide pressurized fluid to the refillable container, monitor filling, determine when to stop filling, and determine how much fluid was provided. The valve assembly may include a float mechanism coupled to one of the valves of the valve assembly to ensure fluid flow is stopped when the fluid container is full. The fluid, which can include carbon dioxide, is stored in a storage tank. A flow system provides the fluid to a filling head, which engages with the fluid container. The flow system includes a transfer pump, valves, and sensors configured to provide the fluid to the filling head.

The present disclosure provides a thermal-activated pressure relief device of a fuel cell vehicle, the thermal-activated pressure relief device including: a hollow body mounted at an outlet of a hydrogen tank; a hydrogen discharge block having a plurality of first hydrogen discharge holes and mounted and fixed in an upper portion of the hollow body; a hydrogen discharge pipe having a plurality of second hydrogen discharge holes and connected to a bottom of the hydrogen discharge block; a piston fitted on an outer side of the hydrogen discharge pipe to be able to move up and down and to open and close the second hydrogen discharge holes; a stopper mounted in a lower portion of the hollow body and limiting a downward movement distance of the piston; and a melting alloy disposed between the piston and the stopper and melting at a predetermined temperature or more.

There is provided a flow-blocking safety valve to prevent an explosion of a portable gas container, wherein, when the portable gas container overheats during use and the temperature rises above a predetermined level, a bridge hold supporting a pin of the safety valve melts and thus a pin or ball securely supported in the bridge holder becomes free to move to close a flow channel through which the gas flows, thereby blocking the gas discharge and preventing an accident occurring when the gas container bursts by overheating.