4670242 O-RING For HITACHI ZX130-5A 4JJ1T

O-RING is usually made of rubber, which is cheap, simple to manufacture, reliable in function and low in installation requirements. It can be used in static applications, and it can also be used in dynamic applications where there is relative motion between components, such as rotating the shaft of a pump and the piston of a hydraulic cylinder. O-RING realizes the sealing function through its elasticity and compressibility. When the O-RING is compressed, its contact surface will expand to form a sealing ring, thus preventing the fluid from passing through. This design enables O-RING to maintain sealing effect under high pressure and high temperature.