Although the rubber-plastic seal is small, its role has made it a basic component and accessory in the national economy, such as national defense...

The cylinder is composed of a cylinder body, a piston, a piston rod, a cylinder head and a sealing ring.

The structural form of the composite seal used for piston rod is designed according to the requirements of the working condition.

An annular cover composed of one or several parts is fixed on one ring or washer of the bearing and contacts with another ring or washer or forms...