The jamming phenomenon caused by burrs and dirt molds into the hydraulic components to slide and fit into the gap is usually called mechanical clamping. When the liquid flows through the gap between the valve core and the valve body, the radial force acting on the valve core causes the valve core to jam, which is called hydraulic clamping.
Mild hydraulic clamping increases the frictional resistance of the male to the moving parts (such as valve core, blade, plunger, piston, etc.) in the hydraulic component during movement, resulting in slow movement or even movement disorder; serious hydraulic clamping Tight, so that the moving parts in the hydraulic component are completely stuck and cannot move, causing the phenomenon of inability to move (for example, the reversing valve cannot be reversed, the plunger of the plunger pump cannot move to achieve oil suction and pressure, etc.). Increased operating force.
It is possible to reduce the occurrence of clamping by improving the processing accuracy of the valve core and the valve body hole, and improving the shape and position accuracy. At present, the shearing machine manufacturers can control the shape accuracy of the valve core and valve body hole, such as roundness and cylindricity, within 0.003mm. Generally, hydraulic clamping will not occur when this accuracy is reached. The hydraulic machine opens several appropriate pressure equalizing grooves on the surface of the valve core, and the voltage groove and the outer circle of the valve core are concentric. The tapered shoulder is adopted, and the small end of the shoulder faces the high pressure area, and the kidney spool is radially centered in the valve hole. If conditions permit, make the valve core or valve body hole vibrate with high frequency and small amplitude in the axial or circumferential direction. Carefully remove the burrs on the valve core shoulder and the tip of the valve hole sinking groove to prevent bumps and damage to the valve core outer circle and the valve body hole. Improve the cleanliness of the oil.
The valve stuck phenomenon caused by burrs and dirt moulded into the hydraulic components to slide and fit into the gap is usually called mechanical clamping. When the liquid flows through the gap between the valve core and the valve body, the radial force acting on the valve core causes the valve core to jam, which is called hydraulic clamping.
