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Fluid Power System

  • CBD.SEALS
  • Fluid Power System

    • Hydraulic Fluid Power System (HFPS) is a system that utilizes fluids to transfer energy and is widely used in the construction machinery, aerospace, and automotive industries. In these systems, seals play a vital role in preventing fluid leaks and external contaminants from entering the system, while ensuring system efficiency and reliability.

    Types of seals

    Static seals: used for sealing between fixed parts, such as flange connection, cover plate, valve body and so on.

    Dynamic seals: used for sealing between relatively moving parts, such as piston and cylinder, shaft and bearing.

    Rotary seals: specially used for sealing rotating shafts, such as shaft seals of pumps and motors.

    Material selection

    Rubber seals: such as nitrile rubber (NBR), fluorine rubber (FKM), polyurethane rubber (AU/EU), etc., with good elasticity and oil resistance.

    Polymer seals: such as polytetrafluoroethylene (PTFE), polyether ether ketone (PEEK), etc., with excellent chemical resistance and high temperature resistance.

    Metal seals: such as stainless steel, copper, aluminum, etc., used for sealing under high temperature, high pressure or special environment.

    Composite seals: combining the advantages of metal and polymer, such as metal-coated rubber, filled polytetrafluoroethylene (PTFE), etc.

    Design requirements

    Pressure resistance: the ability to maintain a seal in high-pressure environments, where the pressure in hydraulic systems is typically high.

    Abrasion resistance: due to the relative motion of components in the hydraulic system, seals need to have good abrasion resistance.

    Temperature resistance: the ability to maintain performance over a range of system operating temperatures, the operating temperature of the hydraulic fluid may range from low to high temperatures.

    Chemical resistance: the ability to resist chemical corrosion of the hydraulic fluid.

    Low friction: Reduces energy loss and improves system efficiency.

    Reliability: the seal must maintain its function without leakage during its design life.

    Manufacturing process

    Molding: for the manufacture of rubber and certain composite seals.

    Injection molding: applicable to the manufacture of certain plastic seals.

    Machining: Suitable for the manufacture of metal and polymer seals.

    Testing and verification

    Leak Testing: Leak testing with hydraulic fluid to ensure that the seals are leak free.

    Environmental testing: Seal performance is tested under simulated hydraulic system working environment, such as high temperature, low temperature, vibration, etc.

    Life test: Evaluate the service life of seals through accelerated aging test.

    Application Examples

    Piston Seal: Used for sealing between piston and cylinder in hydraulic cylinder to prevent hydraulic oil leakage.

    Rod Seal: Used for sealing between the piston rod and cylinder barrel in hydraulic cylinders to prevent external contaminants from entering and hydraulic oil from leaking.

    Valve seals: used in hydraulic valves to ensure that the switching action of the valve is accurate.

    Pump and motor seals: Used in hydraulic pumps and motors to prevent shaft seals from hydraulic oil leakage.