Screw cartridge valve Pressure holding valve 246284 hydraulic valve

     The earliest threaded cartridge valves were used in hydraulic pumps. Because the hydraulic pump needs to integrate the hydraulic valve, which requires the hydraulic valve to be small, so the threaded cartridge relief valve has been developed. It should be said that the threaded cartridge relief valve is the earliest development and application of the earliest threaded cartridge valve, and then the threaded cartridge check valve and the threaded cartridge throttle valve are used in hydraulic pumps. Modern hydraulic pumps have many threaded cartridge valves integrated in them, and the structure and schematic diagram of a closed variable pump has more than a dozen threaded cartridge valves integrated in them. The screw insert relief valve is used to adjust the maximum pressure of the main hydraulic pump and the refill pump; Threaded cartridge check valve is used to control the opening or cutting of the oil circuit; Threaded plug type stop valve is used to connect A and B oil ports when the system fails, to facilitate the dragging or traction of construction machinery; The screw insert differential pressure relief valve is used to adjust the output pressure of the pump to change with the load pressure. With the continuous progress of threaded cartridge valve technology, a multi-function valve specially designed for pump has been developed, which integrates the functions of 4 valves, such as threaded cartridge relief valve, threaded cartridge differential pressure relief valve, threaded cartridge check valve and threaded cartridge globe valve.

      The damping hole of the threaded cartridge valve is easily blocked, so the quality of the oil should be paid attention to in the application process. In addition, according to
 

   The statistics of SANY pumping service department show that most of the reasons for the abnormal reversal of the distribution valve in pumping operations are caused by the blockage (stuck) or damage of the threaded cartridge valve on the main cylinder. Therefore, in the installation, commissioning, construction operations and maintenance should also pay attention to:

1, because the screw cartridge valve is less resistant to pollution than the plate valve, it must be checked regularly to maintain the cleanliness of the oil;
2, the installation of threaded cartridge valve should pay attention to the sealing ring and stop ring should not be cut in the process of assembly;
3, because the thread cartridge valve is limited by the thread strength, therefore, in the process of installation and debugging, strictly comply with the fastening torque installation process requirements, so as not to affect its working strength;
4, once there is dirt in the valve, it is easy to lose its due performance, so there should be appropriate preparation