Abstract: 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 Pc1, Pc2, wherein Pc1 is greater than an atmospheric pressure P0). The cylinder body has an opening and an internal space configured to store a gas, wherein the gas forms an internal pressure P2 smaller than P0. 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 Pc1 and P2. The gas flows out when P2 is greater than Pc2 and an external environmental pressure.

Abstract: A vacuum supply gas cylinder includes a cylinder body, a cylinder valve, a pipeline structure, a first check valve, a positive pressure regulating valve and a second check valve. The cylinder body includes an accommodating space and an opening. The cylinder valve closes the opening. The pipeline structure includes a first and second pipeline. The first check valve is one-way and disposed at the first pipeline. The first check valve has an opening pressure for a gas flow direction from the second end to the first end. The positive pressure regulating valve is disposed at the first pipeline and has an output pressure having a direction same as the gas flow direction from the second end to the first end. The second check valve is one-way and disposed at the first pipeline and is in the same direction as the flow direction of the input and stored gas.

Abstract: 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 Pc1, Pc2, wherein Pc1 is greater than an atmospheric pressure P0). The cylinder body has an opening and an internal space configured to store a gas, wherein the gas forms an internal pressure P2 smaller than P0. 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 Pc1 and P2. The gas flows out when P2 is greater than Pc2 and an external environmental pressure.

Abstract: A vacuum supply gas cylinder includes a cylinder body, a cylinder valve, a pipeline structure, a first check valve, a positive pressure regulating valve and a second check valve. The cylinder body includes an accommodating space and an opening. The cylinder valve closes the opening. The pipeline structure includes a first and second pipeline. The first check valve is one-way and disposed at the first pipeline. The first check valve has an opening pressure for a gas flow direction from the second end to the first end. The positive pressure regulating valve is disposed at the first pipeline and has an output pressure having a direction same as the gas flow direction from the second end to the first end. The second check valve is one-way and disposed at the first pipeline and is in the same direction as the flow direction of the input and stored gas.