Hydraulic cylinder seal kit failure and analysis
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Author : Toparts
Update time : 2019-08-27 17:41:46
Due to time of use or exposure to abuse, hydraulic seal kits will eventually fail and need to be replaced. A design engineer may be able to reduce the damage inflicted on hydraulic seals if they keep in mind what typically causes failures, and try to prevent their damaging impact.
Hardening
Hydraulic seals kit become hard when exposed to high temperatures. This is caused by either high fluid operating temperatures in the application or high-speed heat generation from stroking operations. When seals harden, they crack and lose elasticity, leading to seal failure.
Wear
Whether due to insufficient lubrication or excessive lateral load, wear on the dynamic face of a seal lip can cause considerable damage.
Scarring
Installation tools and processes are important to the operating life of seals. Improper installation can cause cuts or dents in the dynamic lip of the seal, which affects hydraulic seal efficiency as well as introduces foreign elements into the hydraulic fluid.
Fracture
Fracturing is the condition resulting in burns, breaking, long cracks, and a complete breaking off of the dynamic side of seal. This is due to excessive backpressure, high-pressure shocks/spikes, or use of low-grade materials during the manufacturing process of the seal.
Improper installation
As mentioned before, improper installation can create problems with hydraulic seals kit. It may result in uncleanliness, unsafe handling, contamination, and incorrect sizing of the chosen seal. Deciding the seal prior to build is important to make certain that the design is done correctly to ensure proper sealing.
Contamination
Introduction of external flotsam and jetsam into the hydraulic rod causes contamination. When particles such as dirt, mud, powder, or other tiny elements attach themselves to the piston, they dirty the seal. The dirtier the seal, the more it loses its ability to hermetically prevent contaminants from the piston area.
Chemical Erosion
Seal material will break down when it encounters a corrosive fluid. This will occur when the improper seal material is chosen for an application. The use of non-compatible materials leads to chemical attack by oil additives, hydrolysis, and/or oxidation reduction of seal elements. This will result in the loss of seal lip interface, softening of the seal durometer, swelling, and/or shrinkage of the seal. Discoloration of the seal is an indicator of chemical erosion.
There are specific design considerations when selecting Hydraulic cylinder seal kits. The right seal for the required application will depend on the application parameters and the information collected from the operating conditions of the hydraulic cylinders. Prior to selecting any Hydraulic cylinder seal kit, one should investigate the following considerations:
Fluid pressure range: This includes not just the operating range of the fluid system pressure, but also the severity and frequency of the system pressure peaks.
Temperature range: The resting and operating temperature range of fluid and cylinder assembly are important on seal selection.
Stroke speed: The velocity of the piston rod’s stroke will impact the seal’s lifetime.
Fluid type: The fluid media and the viscosity are important for seal efficiency and effectiveness.
Hardware dimensions: The size of the seal will determined the size of the cylinder. This includes the rod and bore dimension, seal groove dimensions, gaps, cylinder’s overall length, surface finish specifications, and the stroke length.
Cylinder application: How the cylinder is used will impact how long the seals can last under certain operating conditions. This includes cylinder installation, environmental factors, and exposure to harsh conditions
Hardening
Hydraulic seals kit become hard when exposed to high temperatures. This is caused by either high fluid operating temperatures in the application or high-speed heat generation from stroking operations. When seals harden, they crack and lose elasticity, leading to seal failure.
Wear
Whether due to insufficient lubrication or excessive lateral load, wear on the dynamic face of a seal lip can cause considerable damage.
Scarring
Installation tools and processes are important to the operating life of seals. Improper installation can cause cuts or dents in the dynamic lip of the seal, which affects hydraulic seal efficiency as well as introduces foreign elements into the hydraulic fluid.
Fracture
Fracturing is the condition resulting in burns, breaking, long cracks, and a complete breaking off of the dynamic side of seal. This is due to excessive backpressure, high-pressure shocks/spikes, or use of low-grade materials during the manufacturing process of the seal.
Improper installation
As mentioned before, improper installation can create problems with hydraulic seals kit. It may result in uncleanliness, unsafe handling, contamination, and incorrect sizing of the chosen seal. Deciding the seal prior to build is important to make certain that the design is done correctly to ensure proper sealing.
Contamination
Introduction of external flotsam and jetsam into the hydraulic rod causes contamination. When particles such as dirt, mud, powder, or other tiny elements attach themselves to the piston, they dirty the seal. The dirtier the seal, the more it loses its ability to hermetically prevent contaminants from the piston area.
Chemical Erosion
Seal material will break down when it encounters a corrosive fluid. This will occur when the improper seal material is chosen for an application. The use of non-compatible materials leads to chemical attack by oil additives, hydrolysis, and/or oxidation reduction of seal elements. This will result in the loss of seal lip interface, softening of the seal durometer, swelling, and/or shrinkage of the seal. Discoloration of the seal is an indicator of chemical erosion.
There are specific design considerations when selecting Hydraulic cylinder seal kits. The right seal for the required application will depend on the application parameters and the information collected from the operating conditions of the hydraulic cylinders. Prior to selecting any Hydraulic cylinder seal kit, one should investigate the following considerations:
Fluid pressure range: This includes not just the operating range of the fluid system pressure, but also the severity and frequency of the system pressure peaks.
Temperature range: The resting and operating temperature range of fluid and cylinder assembly are important on seal selection.
Stroke speed: The velocity of the piston rod’s stroke will impact the seal’s lifetime.
Fluid type: The fluid media and the viscosity are important for seal efficiency and effectiveness.
Hardware dimensions: The size of the seal will determined the size of the cylinder. This includes the rod and bore dimension, seal groove dimensions, gaps, cylinder’s overall length, surface finish specifications, and the stroke length.
Cylinder application: How the cylinder is used will impact how long the seals can last under certain operating conditions. This includes cylinder installation, environmental factors, and exposure to harsh conditions
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