Check though  Volvo check valves are other hydraulic valves. Chek valve valves are also called one-way or automatic valves. Check valves usually prevent fluid return in the hydraulic system. A small part of the flow is usually through the spool ( Spul) Control valves leak, when there is a need to stop the cylinder under load, a special type of check valve can be used. This type of one-way valve is called the Pilot operated check valve. The check valve, even with the command line, is another type of one-way valve family. The difference is that if the pressure in the control line increases, the direction in Normal mode is also blocked and fluid is allowed to pass. In the internal mechanism of this valve, it is kept in place by a light valve spring, and when it is necessary for the fluid to flow in the opposite direction, sufficient pressure must be applied to the piston connected to the end of the valve through the inlet line of the command line. Be applied. To prevent pressure build-up on the back of the piston, a separate duct is installed to drain the oil. The dashed line shown in the check mark symbolizes the command line. One-way valves or check valves are valves that only allow the passage of fluid through one side, and the operation and function of one-way valves or check valves are automatic. Depending on the model of one-way valve or check valve, which has disks and disc connection to the body are different. The type and shape of the function are similar and how the one-way valve or check valve works is such that the disc is restrained by the arm to the body The arm only allows the disc to be placed on one side, when the fluid pressure is applied to the disc in the direction of the one-way valve inlet or check valve, the arm moves the disc and passes the fluid to the license and then due to force. The return fluid and spring in the one-way valve arm or check valve and disc traction force are returned to their original position and the valve path is closed again. Now, if the pressure is applied in a direction other than the main direction of the valve, the disc closes the path and the fluid will not be allowed to return to the fluid. Check valves can be supplied by Roxan Parsian in Hawe brand b