按用途分为溢流阀﹑减压阀和顺序阀。（1）溢流阀：能控制液压系统在达到调定压力时保持恒定状态。用於过载保护的溢流阀称为安全阀。当系统发生故障，压力升高到可能造成破坏的限定值时，阀口会打开而溢流，以保证系统的安全。（2）减压阀：能控制分支回路得到比主回路油压低的稳定压力。减压阀按它所控制的压力功能不同，又可分为定值减压阀（输出压力为恒定值）﹑定差减压阀（输入与输出压力差为定值）和定比减压阀（输入与输出压力间保持一定的比例）。（3）顺序阀：能使一个执行元件（如液压缸﹑液压马达等）动作以后，再按顺序使其他执行元件动作。

CPDG-03-05-ET-10-FT    CPDT-03-05-ET-10-FT    CPDF-03-05-ET-10-FT

CPDG-06-05-ET-10-FT    CPDT-06-05-ET-10-FT    CPDF-06-05-ET-10-FT

CPDG-10-05-ET-10-FT    CPDT-10-05-ET-10-FT    CPDF-10-05-ET-10-FT

CPDG-03-50-ET-10-FT    CPDT-03-50-ET-10-FT    CPDF-03-50-ET-10-FT

CPDG-06-50-ET-10-FT    CPDT-06-50-ET-10-FT    CPDF-06-50-ET-10-FT

CPDG-10-50-ET-10-FT    CPDT-10-50-ET-10-FT    CPDF-10-50-ET-10-FT

CPDG-03-05-ET-10-FP    CPDT-03-05-ET-10-FP    CPDF-03-05-ET-10-FP

CPDG-06-05-ET-10-FP    CPDT-06-05-ET-10-FP    CPDF-06-05-ET-10-FP

CPDG-10-05-ET-10-FP    CPDT-10-05-ET-10-FP    CPDF-10-05-ET-10-FP

CPDG-03-50-ET-10-FP    CPDT-03-50-ET-10-FP    CPDF-03-50-ET-10-FP

CPDG-06-50-ET-10-FP    CPDT-06-50-ET-10-FP    CPDF-06-50-ET-10-FP

CPDG-10-50-ET-10-FP    CPDT-10-50-ET-10-FP    CPDF-10-50-ET-10-FP

台湾WILSHEN伟圣单向阀

CRG系列单向阀部分型号：

CRG-03-05-20-SE    CRG-06-05-20-SE    CRG-10-05-20-SE 

CRG-03-50-20-SE    CRG-06-50-20-SE    CRG-10-50-20-SE 

CRG-03-75-20-SE    CRG-06-75-20-SE    CRG-10-75-20-SE 

CRG-03-05-10-SE    CRG-06-05-10-SE    CRG-10-05-10-SE 

CRG-03-50-10-SE    CRG-06-50-10-SE    CRG-10-50-10-SE 

CRG-03-75-10-SE    CRG-06-75-10-SE    CRG-10-75-10-SE