壓力控制閥: 減小管道或缸體內的壓力的液壓閥
Pressure Control Valves(PCV)：Reducing amount of pressure in tanks or pipes system
溢流閥：在液壓設備中主要起定壓溢流作用，穩壓，系統卸荷和安全保護作用。
Overflow valves： Maintaining pressure on the line above the valve. It can also be installed as a safety device to prevent pressure build up

減壓閥: 通過調節，將進口液體或氣體壓力減至某一需要的出口壓力，并依靠介質本身的能量，使出口壓力自動保持穩定的閥門
Pressure Regulator： This kind of valve can cut off the flow of a liquid or gas at a certain pressure.
順序閥: 順序閥通常使用一軸壓力信號轉變,從而在一個預設的壓力下打開或關閉液體路徑 (國內主要是榆次液壓集團有限公司、北京華德液壓集團有限公司、上海立新液壓件廠等)
Sequence valves ：Usually use a pressure signal to shift a spool, thereby opening or closing a flow path at a pre-set pressure.
節流閥throttle valves、節流閥是通過改變節流截面或節流長度以控制流體流量的閥門。將節流閥和單向閥并聯則可組合成單向節流閥