调节阀又名控制阀，通过接受调节控制单元输出的控制信号，
借助动力操作去改变流体流量。调节阀一般由执行机构和阀门组成。如果按其所配执行机构使用的动力，调节阀可以分为气动调节阀、电动调节阀、液动调节阀三种，另外，按其功能和特性分，线性特性，等百分比特性及抛物线特性三种。.
HOYEA叠加式单向阀部分型号如下：
DA-02-P-31.5a-70 DA-02-A-31.5a-70 DA-02-B-31.5a-70
DA-02-W-31.5a-70 DA-02-T-31.5a-70 DA-02-P-31.5b-70
DA-02-A-31.5b-70 DA-02-B-31.5b-70 DA-02-W-31.5b-70
DA-02-T-31.5b-70 DA-02-P-31.5c-70 DA-02-A-31.5c-70
DA-02-B-31.5c-70 DA-02-W-31.5c-70 DA-02-T-31.5c-70
DA-03-P-31.5a-70 DA-03-A-31.5a-70 DA-03-B-31.5a-70
DA-03-W-31.5a-70 DA-03-T-31.5a-70 DA-03-P-31.5b-70
DA-03-A-31.5b-70 DA-03-B-31.5b-70 DA-03-W-31.5b-70
DA-03-T-31.5b-70 DA-03-P-31.5c-70 DA-03-A-31.5c-70
DA-03-B-31.5c-70 DA-03-W-31.5c-70 DA-03-T-31.5c-70
HOYEA叠加式液控单向阀型号如下：
DAY-02-W-31.5a-50 DAY-02-A-31.5a-50 DAY-02-B-31.5a-50
DAY-02-P-31.5a-50 DAY-02-T-31.5a-50 DAY-02-W-31.5b-50
DAY-02-A-31.5b-50 DAY-02-B-31.5b-50 DAY-02-P-31.5b-50
DAY-02-T-31.5b-50 DAY-02-W-31.5c-50 DAY-02-A-31.5c-50
DAY-02-B-31.5c-50 DAY-02-P-31.5c-50 DAY-02-T-31.5c-50