Pu Hydraulic U Cup Seal

Welcome to contact us for PU U Cup seal

The reciprocating rod seal is one of the most critical elements in hydraulic equipment. Rod seals for hydraulic cylinders seal the system pressure on the rod side of the cylinder against the atmosphere. The seals need to withstand high pressures during the stroke phase as well as the position holding operation of the cylinder. Rod seal or Gland seals as they are often called, exist in a wide variety of different types. When choosing a rod seal, it is important to define the area of application and the seals need to be chosen as per their specification and design requirement. The individual profile design show specific behaviours and performance which need to be in line with the application´s requirements. There are single or composite designs of rod sealing systems. A leaking rod seal can cause accidents, operational problem as well as environmental pollution. In addition to normal wear and ageing, this seal is directly affected by irregularities on the rod surface. These seals are at times subjected to high and low pressure, often in combination with alternating high and low temperature. We have chosen some of the most versatile seal designs to meet these demanding requirement specifications. In some systems a secondary rod seal or buffer seal is also used to reduce the load on the primary rod seal.

PU Piston & Rod Seals

U Shape Hydraulic PU seals

Description

FEP is a thermoplastic material with properties similar to PTFE. O-rings which are seamlessly coated with FEP have an elastic core made from FPM or VMQ and are used if very high thermal or chemical loads are present. The high chemical resistance of the coating protects the core against damage by the potentially aggressive medium.

FEP coated O-rings are used – similar to PTFE-rings – where the chemical resistance of the normal elastomer O-ring is no longer sufficient, but where a certain elasticity is needed. The elasticity is ensured by the inner ring and the chemical resistance is achieved by the seamless FEP coating.

Applications

FEP coated O-rings are perfectly suited for the chemical and petrochemical sector, medical technology, food sector, water and waste water technology and similar industrial applications. A typical application for FEP coated O-rings is the sealing of valve stems and as a secondary sealing element for slow switching and rotary movements.

Properties

·         Very good chemical resistance against most liquids and chemicals

·         Temperature range from approx. –60 °C to 200 °C [depending on inner ring material]

·         No contamination of food, pharmaceutical or medical products

·         Physiologically harmless, can be sterilised

·         Sufficient elastic behaviour

·         FEP O-rings can be replaced with standard O-ring seals without limitation

·         No changes to the groove dimensions are necessary

·         The O-rings are less flexible than elastomer O-rings due to the FEP coating. They can only be stretched minimally and have a lower elasticity or a higher permanent deformation