Also known as the one-way valve or check valve check. For the hydraulic system to prevent reverse flow of oil flow, or compressed air for pneumatic system to prevent reverse flow.

Check valve has straight and right-angle type two. Straight-way valve with threaded connections installed in the pipeline. Right Angle check valves with threaded connection, flange type connectivity and connecting three forms. Check valve, also known as pressure valve closed valves or insurance, the same as it is with the one-way valve to prevent reverse flow of oil. But the need for oil in the hydraulic circuit flow reverse flow can use hydraulic control, open the check valve, the oil flow can flow in both directions. Check valve used cone disc, sealed a good performance. Oil flow closed in demand, the valve can be used as oil-way locking sky Paul pressure. Way check valve leakage control oils are internally drained and leaking Type II species. Internally drained oil flow in the reverse outlet is available without backpressure passage; otherwise required outflow type, in order to reduce the control oil pressure.

Common Failures and
Troubleshooting
① disc break;
② medium back.
The reasons causing the valve break
Medium pressure before and after the valve is close to balance but each other, "see-saw" state, the valve seat often beat, some brittle materials (such as cast iron, brass, etc.) made valve was broken. Prevention approach is to use the valve to check the toughness of the material.
Media reflux causes
① sealing surface damage;
② sandwiched impurities. Repairing and cleaning the sealing surface impurities can prevent backflow. Dual spin-initiated check Usage and characteristic swing check valve function is to prevent the line of medium back. Check valves are automatic valves, opening and closing pieces by medium flow from the power structure
Row on or off. Check only for the pipeline medium flow in one direction, to prevent the media back, to prevent accidents. The company's American Standard valve design and manufacture in accordance with ANSI B16.34 standards. Variety: swing check valve, lift check valve, vertical lift check valve; Class 150lB ~ 900Lb; NPS 1 "~ 28" Operating temperature -40 ~ 570 ℃; Body material: WCB, WC1 , WC6, WC9, C5, CF3, CF8, CF3M, CF8M and so on. Swing Check Valve Applicable medium: water, steam, oil, nitric acid, strong oxidizing medium and urea. Widely used in power plants, petroleum, chemical, pharmaceutical, food and other industries. With supporting the use of imported equipment directly. Wafer Check Valve for nominal pressure PN1.0MPa ~ 42.0MPa, Class150 ~ 2500; nominal diameter of DN12 ~ 1200mm, NPS1 / 2 ~ 48; working temperature -196 ~ 540 ℃ various pipeline to prevent medium back. By the choice of different materials, applicable for various media water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea.