Valve outlet and inlet connections

CGA Pamphlet V-l-87, American Canadian and Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, ANSI, B57.1 CSA B96, 1987. 

Compressed Gas Cylinder Valve Outlet and Inlet Connections Refrigerant Expansion Valves... 

In the United States and several other countries, the industry has developed standardized cylinder valve outlet and inlet connections, transfer connections, and regulator connections for specific types and groups of compressed gases to prevent the misapplication of these potentially hazardous materials. 

Container valve connections that do not fit must not be forced. Threads on regulator connections or other auxiliary requirements must match those on the container valve outlet. The valve outlet connection should conform to recognized standards such as ANSI/CGA V-1, American National, Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections [14]. However, it must be acknowledged that connections other than those found in ANSI/CGA V-1 may exist. If a user chooses such a connection, extreme care must be taken to ensure that such connections do not cross-connect with existing connections in ANSI/CGA V-1, and that they have been properly engineered for the intended gas service and pressure. The threads on a cylinder valve outlet, as well as on regulators and other ancillary equipment, should be examined at frequent intervals to ensure they are clean and undamaged. 

Many valve outlet and inlet connections have been standardized by CGA for the different families of gases to prevent the interchange of regulator equipment between gases that are not compatible. These standardized connections have been adopted by the American National Standards Institute (ANSI) and CSA. Refer to Chapter 9 and ANSI/CGA V-1, American National, Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections [6]. 

For more detailed information about cylinder valve outlet and inlet connections, cylinder ancillary equipment connections, bulk transfer connections, and regulators, refer to Chapter 8. 

Cylinder neck threads must be examined whenever the valve is removed from the cylinder. When manufactured, cylinders have a specified number of full threads of proper form as required in applicable thread standards. More information on this can be found in CGA V-1, American National, Canadian, and Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections. [21] When inspected, cylinders must be rejected if the required number of effective threads has been reduced so that a gas-tight seal cannot be obtained by reasonable valving methods. Common thread defects are worn or corroded crests and broken or nicked threads. 

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