Compact type seal is a multi-structure, which, depending on: the burden on the sealing node, materials and the manufacturing technologies, has different designs. The most common types of seals include three-part and five-part compact.

Sealing function of piston satisfies the o-ring pos. 1, which seals a result of a clamping section. The sealing rings are generally made of rubber with a hardness of 80-90 IRHD. Before pressing into the gap between piston and cylinder, the sealing ring protect support rings on both sides to pos. 3, which are made of a material with a higher modulus of elasticity and strength. In addition, support rings should have the ability to adapt its shape to the cross-sectional profile of the sealing ring under variable pressure and direction of thrust force on the piston. For proper cooperation in the conduct of the piston in the cylinder correspond Support-leading rings pos. 2, which carry the friction derived from the transverse forces and longitudinal pressure exerted by the sealing ring via the retaining ring and pressure from the sealed medium. Support-leading rings are made of thermoplastics with good sliding properties and high resistance to surface pressures. Pressure and resistively-guide rings are cut at the periphery in order to enable their assembly in the chamber of structure. Three-part assemblies do not have a separate supporting rings and partially fulfill the function of the guide rings, which limits their use in high pressure conditions.

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Sealing rings made of PTFE composites usually consist of two elements:

• A support ring made of rubber mostly like circular O-ring
• A sealing ring made of PTFE composite shape dependent on the type of the node

The support ring serves as a prandial producing an initial peripherally-radial emphasis as a result its modulus of elasticity. Sealing ring transfers radial forces on mobile structure as a result of the impact of the support ring and the pressure of sealed medium. These seals are used to seal the pistons (OW1) and rod (OW3), hydraulic cylinders when it is desired to save space of node and working in high-speed.

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ZWWG also provides services in the field of production of non-standard. With technical drawing and knowing the customer's requirements, our specialized staff is able to produce from the raw material a very high quality product. Non-standard products is a sector of our business, which was special recognition mainly on foreign markets, such in Western Europe and Africa, which proves the quality of our services.