通用低压（3000psig）止回阀和通用高压（10000psig）止回阀拥有由单个棒料经机械加工形成的阀体。这种经济型阀门是为实现在最小压降的情况下使流量达到最大限度而设计的。
PIPE             SIZE ORIFICE DIAMETER      STYLE NUMBER
3/8                    0.348                     U3C
1/2                    0.464                     U3D
3/4                    0.593                     U3F
1                      0.890                     U3H
1-1/4                  1.135                     U3I
1-1/2                  1.385                     U3J
2                      1.555                     U3K
2-1/2                  1.555                     U3L
3                      2.025                     U3M
4                      2.560                     U3N

PIPE SIZE         ORIFICE DIAMETER           STYLE NUMBER
3/8                   0.348                      U1C
1/2                   0.464                      U1D
3/4                   0.593                      U1F
1                     0.890                      U1H
1-1/4                 1.135                      U1I
1-1/2                 1.385                      U1J