单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向运动。
单向阀有直通式和直角式两种。直通式单向阀用螺纹连接安装在管路上。直角式单向阀有螺纹连接、板式连接和法兰连接三种情势。液控单向阀也称闭锁阀或保压阀，它与单向阀雷同，用以防止油液反向运动。但在液压回路中需要油流反向运动时又可利用把持油压，打开单向阀，使油流在两个方向都可运动。液控单向阀采用锥形阀芯，因此密封性能好。在请求封闭油路时，可用此阀作为油路的单向锁紧而起保压作用。液控单向阀把持油的泄漏方法有内泄式和外泄式二种。在油流反向出口无背压的油路中可用内泄式；否则需用外泄式，以下降把持油压力。
Check valves or as a one-way valve. For the hydraulic system to prevent reverse flow of oil flow.
A straight-through one-way valves and rectangular Type two. Straight-through one-way valves installed in a connecting thread of the pipeline. Rectangular style is a one-way valve connecting thread, flange type connectivity and connecting three forms. Fluid control valves also known as one-way pressure valve closed valves or insurance, with the same one-way valves to prevent reverse flow of oil. However, the need for oil flow in hydraulic circuit reverse flows can use hydraulic control, opening a one-way valve, so that the flow of oil can flow in both directions. Fluid control one-way valve used cone disc, sealed a good performance. oil flow closed in demand, the availability of one-way valves as oil flow park sky Paul pressure. Fluid leakage control one-way valves control the manner of oil and oil-leaking Type II species. No reverse flow of oil exports in the oil flow available within inflow Type; Otherwise required outflow type, the control of oil in order to reduce pressure.
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