engine valve stem oil seal

 1.Inside and outside packing is listed as below for your selection or Plain packing as your request

2.FOB QINGDAO or others ports as nornimated

3.Express /Air /SEA shipment is acceptable  

 Factory  View -Actual Photos

Factory Inspection Machine & Process

Factory Self Inspection report  : 

3rd Party Inspection requested by customer

Copy right packing design and Registered self-own Brand

Existing Customer

HOW TO SELECT OIL SEAL  

Selection Guidelines :

A : Determine the general category of the seal application

B: Determine if operating conditions exceed the design limited

1.  Shaft Speed 2. Pressure  3. Eccentricity 

C: Select appropriate lip ,case and spring material based on temperature fluid and environment to be sealed and excluded

D: Review bore and shaft configuration to ensure compatibility with seal

E: OEM service will be provided if all usage request exceed all of above

Process 

Material Selection

Nitrile Rubber ( NBR )

   NBR is most commonly used material. It has good heat resistance properties, good resistance to oils, salt solutions, hydraulic oils, and gasoline. Operation temperatures are recommended from -40° to 120°C. It also functions well under dry environment, but only for intermittent periods. The disadvantage is poor chemical resistance.

Polyacrylate Rubber (PA)

   Acrylic rubber has better heat resistance than Nitrile. It is recommended for high surface speed environment. The operation temperatures are recommended from -20° to 150°C. It should not be used with water or in temperature below -20°C.

Silicone Rubber (SI)

   Silicone compounds operate effectively in a broad temperature range of -50° to 180°C. It is unsurpassed in its resistance to heat and low temperatures. The high lubricant absorbency of silicone minimizes friction and wear. It is usually used for crank shaft seals. Silicone has poor hydrolysis resistance. It should not be used in oxidized or hypoid oils.

Fluorinated Rubber (VI)

   Fluorinated rubber is widely known under the du Pont trade name of Viton R. It has the best resistance to chemicals, and superior performance to high temperatures. Though VITON provides so many good prospects, it has the highest cost.

Performance of Hualei Seals  

Oil Installation Procedures

Incorrect Installation