G-20 check valves are used with G-20 conventional gas lift valve to protect the casing from backflow, allow for pressurizing the tubing in various procedures, and prevent any comingling of flow in dual installation. The conventional check assemblies utilize the same metal to metal seal as well as metal dart to soft hy-car pad seal as does the retrievable valve checks. The G-20 check is a velocity type check requiring flow pressure to force the dart on seat but is also available in a normally closed variation with a spring attachment.

GCF-20 is a reverse flow check with all the characteristics of the G-20 check but designed for use with the 11/2" conventional casing flow valve.

G-40 check valves are used with G-40 conventional gas lift valve to protect the casing from backflow, allow for pressurizing the tubing in various procedures, and prevent any comingling of flow in dual installation. The conventional check assemblies utilize the same metal to metal seal as well as metal dart to soft hy-car pad seal as does the retrievable valve checks. The G-40 check is a velocity type check requiring flow pressure to force the dart on seat but is also available in a normally closed variation with a spring attachment.

G-40 check valves are of the same design as the G-20 but designed for use with the 1" conventional G-40 valve. The dart, seal and pad are of the same design as the K series retrievable valves.

GCF-40 is a reverse flow check with all the characteristics of the G-40 check but designed for use with the 1" conventional casing flow valve.

The GCF-20 is a reverse flow check with all the characteristics of the G-20 check but designed for use with the 11/2" conventional casing flow valve. The valves are used to protect the casing from backflow, allow for pressurizing the tubing in various procedures, and prevent any comingling of flow in dual installation. The conventional check assemblies utilize the same metal to metal seal as well as metal dart to soft hy-car pad seal as does the retrievable valve checks. The GCF-20 check is a velocity type check requiring flow pressure to force the dart on seat but is also available in a normally closed variation with a spring attachment.

The GCF-40 is a reverse flow check with all the characteristics of the G-40 check but designed for use with the 1" conventional casing flow valve. The valves are used to protect the casing from backflow, allow for pressurizing the tubing in various procedures, and prevent any comingling of flow in dual installation. The conventional check assemblies utilize the same metal to metal seal as well as metal dart to soft hy-car pad seal as does the retrievable valve checks. The GCF-40 check is a velocity type check requiring flow pressure to force the dart on seat but is also available in a normally closed variation with a spring attachment.