管件止回阀是为直流金属管线设计的三段式结构止回阀。所提供的TCV阀门完整地配置了压缩管用的金属箍和螺母。当弹簧强度很小的时候，TCV的封装设计可以实现最低的压降。
PIPE             SIZE ORIFICE DIAMETER         STYLE NUMBER
1/4                    0.348                    TFB
3/8                    0.348                    TFC
1/2                    0.464                    TFD
5/8                    0.464                    TFE
3/4                    0.593                    TFF
7/8                    0.890                    TFG
1                      0.890                    TFH
1-1/4                  1.135                    TFI
1-1/2                  1.385                    TFJ
2                      2.025                    TFK