Superior Quality Bonded Seals Manufacturing Expert – AOK

Established in 1995, a leading and professional bonded seal washer (Sealing Washers) manufacturer, AOK Valve Seal Ltd. supplies various bonded seals which are also called “Dowty Washers”. We also provide quality valve stem seals and o-rings series products. With years of experience and advanced technology, AOK are excellent in producing high quality bonded seals (sealing washers), and obtained ISO 9001 and TS16949 qualifications. We focus on creating value for customers by providing outstanding technical and manufacturing services.


Incorporating CAD/CAM system with advanced CNC machine centers and CNC lathes to design and make molds, our mold R&D and speed of manufacture are exceed than the other factory, we also equip vacuum compression molding machines for manufacturing rubber products.


We own the largest vacuum vulcanizing machine in Taiwan, and the working dimension of the machine is 2000mmx2000mm. We manufacture large-sized O-ring (ODMax 1850mm), Oil Seal (ODMax1700mm) and V-ring (ODMax1850mm). We can manufacture o-ring size to meet customers’ requirement.


We are determined to offer satisfactory products, so do not hesitate to get in contact with AOK, we will be very pleased to assist you at any stage of your project. We accept OEM and ODM orders, and welcome customers’ drawing and samples for cooperation of product development production.


If you are interested in our bonded seals or other products, welcome to visit our website and feel free to contact AOK for more details.


AOK Valve Stem Seals Ltd.

No., 24-6, Nankang 3rd Rd.,Nantou City 540 Taiwan

TEL: 886-49-2263777

FAX: 886-49-2263776


Famous and Professional Vehicle Valve Seal Manufacturer – AOK

Established in 1995, AOK has made concrete contribution to valve seal industries for over 20 years. We supply high quality Valve Seals for cars, such as Alfa Romeo valve seals, BMW vehicle valve seal, and motorcycle’s and so on. In order to maintain high quality, the valve seals of AOK are all inspected thoroughly, therefore, quality of AOK’s seals has won worldwide recognition.


With more than 10 years of experiences in designing and producing all kinds of oil seals, AOK has acquired rich knowledge and the latest technology in the automobile application field. As a professional valve seal manufacturer, we have ISO9001 and TS16949 qualification. AOK markets globally and sells the valve stem seals in European, North America and Asian countries. Maintaining excellent quality and customer satisfaction is AOK’s No. 1 priority. AOK provides you with top quality of valve seals.


In the website of AOK Car valve seal manufacturer, we provide some car valve seals video and introduction to featured oil seals and valve stem seals. Our supply service not only includes oil seal and the valve accessory equipment, but also includes the complete production lines.


We hope you will find our site informative and helpful to your valve seal needs. Moreover, please do not hesitate to contact us by phone or e-mail after browsing our site. If you have any oil seal or car valve seal questions, please fill out our inquiry form and we will response you any additional details that you inquire.


AOK Valve Stem Seals Ltd.

No.24-6, Nankang 3rd Rd., Nantou City 540, Taiwan

TEL: 886-49-2263777

FAX: 886-49-2263776



Provide Various Oil Seals and Rubber Products – JENP Oil Seal Manufacturer

Established in 1978, JENP is a professional manufacturer of oil seals and various kinds of special rubber products.


The founder of JENP, Mr. K.M. Su, believes “BRAND IS CAPITAL FOR LONG TERM BUSINESS”, therefore, started to produce rubber sealing component and Rod Seal with JENP brand to enter global market with constant market share through five continents and exporting rate is 90% of annual sales volume approximately. JENP, the leading Oil Seal Manufacturer, is the orientation of advanced technology to produce high precision tooling and top quality for sealing technology to expand oversea market.


JENP Oil Seal Manufacturer aiming to design and supply high precision tooling for Oil Seals, Rod Seals, and rubber sealing components.


Here we offer diverse types of Oil Seals produced by Rubber Outer Diameter, Metal Outer Diameter, and Metal Outer Diameter with Inner Case…etc.


If you need further details about JENP Oil Seal Manufacturer and our oil seals, please do not hesitate to contact us for more information.



45-16, Ah Li St, Cheng Ping Village, Fu Hsin, Changhua, Taiwan

Tel: 886-4-7707930-1

Fax: 886-4-7700687



Dowty Washers?

AOK Valve Stem Seals Ltd. supplies various bonded seals (sealing washers) and which are also called “dowty washers”. With years of experiences and advanced technology, AOK is excellent in producing the high-quality bonded seal (sealing washer) with ISO 9001 and TS16949 qualifications. We focus on creating value for customers by providing outstanding technical and manufacturing services.


Established in 1995, AOK Valve Stem Seals Ltd. is a manufacturer specializing in producing valve stem seals, boned seals (sealing washers), large size O-rings, large size oil seal, bushings and precise customized rubber molded products. Maintaining excellent quality and customer satisfaction is our first priority.



Rod Seals

The founder of JENP, Mr.K.M.Su, believes “BRAND IS CAPITAL FOR LONG TERM BUSINESS”, therefore, started to produce rubber sealing component and rod seals with JENP brand to enter global market with constant market share through five continents and exporting rate is 90% of annual sales volume approximately. JENP, the leading rod seal manufacturer, is the orientation of advanced technology to produce high precision tooling and top quality for sealing technology to expand oversea market.

Send your inquiry for quote or call to discuss your rod seal products with us.

Valve Stem Seal by Lian Yu Oil Seal Enterprise

Lian Yu Oil Seal Enterprise Co., Ltd. has been a professional manufacturer of vehicle and mechanical oil seals since its establishment in 1978. The company’s commitment to honest business operation, innovation and progress, and excellent service provision comes from the belief that expertise and quality not only plays a key role in the continuity of LYO, but is also the driving force behind its corporate development. LYO does its best to meet clients’ needs, bringing them great advantages in market competition.

Lian Yu provides an extensive range of valve stem seals to the customers around the world. The valve stem seal is used in various types of industrial valves, such as ball, gate, globe, butterfly and check valves. The products are made of high quality raw materials, which are purchased from the reliable, long-term vendors. It is a client-oriented manufacturer and supplier that are dedicated to developing the products to assure the clients’ complete satisfactions. All products are manufactured under strict quality control practices from procurement of raw materials to the dispatch. If you are interested in learning more details about the valve stem seal, please browse the product category and feel free to send your inquiries.

Oil Seal of Taiwan ASA

ASA is an experienced oil seal manufacturer with more than 10 years experiences in oil seal tooling design and manufacturing.

ASA offers oil seals for European cars, U.S. tractors, agricultural machinery and more. To ensure the quality of the oil seals, all the products have been made as per ISO certification. Besides, ASA will provide free ASTM 2000 elastomer test reports and free slabs and buttons for your independent testing of each oil seal. View the oil seal product category to check out further details of ASA products and welcome to send your inquiries. W will be happy to help you.

Oil Seals Auto Multi-Functional Working Line

SUN HUANG JU HYDRAULIC MACHINERY INDUSTRIAL CO., LTD. was established in May 1978 located in Taiwan. It is a professional and experienced hydraulic machines manufacturer of oil seals auto multi-functional working line.

Welcome to visit ““and ““. We develop a series new full auto working line to finish all the working process efficiently to cut down the labor cost, improve quality and increase product value.

The world famous rubber companies such as SKF, FDS, PAKER, HALUTE, SEA, GARLOCK, BOUSH, NOK(Japan), KEEPER(Japan), ARIS(Japan), P&K(China), SHERCON(China), FENNER(India), KOK(Taiwan), NAK(Taiwan), FOS(Taiwan), and so on are all our customers.

As for our profession & experience in oil seals auto multi-functional working line, we have successfully improved the quality and manufacture technology of seals. Many thanks for getting much supporting from our customers. Hope we can provide more service to more customers and input more energy to the seals industry.

Are You Familiar With the Oil Seals?

Are you familiar with the oil seal? Simply speaking, it is an element that is used to seal the oil. It is the very important component for all kinds of mechanical equipments. Although it is small, its application is quite wide. To some degree, its quality and properties have a direct influence on the reliability of the mechanical equipment. Some of these seals have a year’s operation life. Some can only be used for several months. These seals are easily out of service because of the oil leakage. As a result, the working efficiency of the mechanical equipment is seriously affected. Meanwhile, the production cost is increased and the environment is polluted.

Generally speaking, the working principle of the oil seal is simple. In the free condition, the inside diameter of the oil seal’s lip is smaller than that of the shaft collar. And it has the shrink range. After this seal is installed, the interference pressure and the shrinkage force will generate the radial thrust on the slewing axis. When this seal is in operation, the lip of the oil seal will form a seal belt under the influence of the radial thrust. Under the pressure of the lubricating oil the fluid permeates the cutting edge of the oil seal and a layer of oil film is formed. The oil layer can prevent the oil leakage and play an important role in sealability.

During operation, there are a lot of factors that result in the oil leakage. The bad sealability of this seal is the main factor. When the shaft is abraded seriously and there is a groove on the shaft, the oil seal will lose its sealability. Even through people change a new oil seal, the sealability still can not be improved. When the contact pressure between the lip and the shaft is reduced, the shrink range becomes very small and thus the sealability becomes very weak.

How to solve the above-mentioned problem will be introduced as follow. First, the basic method is to grasp the knowledge of the oil seals. Then people can identify the quality and function. Second, check and maintain this seal regularly. As far as we know, the oil seals are often used in the harsh working conditions. The difference in temperature is very big and there is a lot of dust in the environment. If people do not examine them, they are easily out of service. Third, if the shaft collar is seriously abraded or the rubber of this seal becomes old, the related components should be repaired or changed immediately. Fourth, the unused oil seals should be kept properly. Or else, the seals will be easily stained with the dust or greasy dirt. Then they will be out of service. is the global B2B platform in the industry of mechanical parts. SeekPart aggregates the trade leads in this area, and our ultimate target is to benefit the buyers and sellers of mechanical parts by utilizing these leads through our online tools.

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Leading Oil Seal Manufacturer – ASA Oil Seals Co., Ltd.

ASA was founded in 1988, specializing in manufacturing oil seals. With more than twenty years experiences, the oil seal we produced are all quality guaranteed. ASA provides various sizes and different materials of oil seal enable to fit in different usages, including Oil Seal series for European Cars, Oil Seal series for U.S. Tractors and special oil seal series. Also, ASA has a strong R&D department, we dedicated in innovate our products to satisfy the ever-changing market needs.
Feel free to contact us, if you need more information about ASA oil seals. We are confident that ASA is your best choice!

oil seal
Oil Seal – ASA

ASA Oil Seals Co., Ltd.

Address: No. 87-6, Nanshing St., Sanhe Tsuen, Fushing Shiang, Changhua Hsien, Taiwan
Tel: +886-4-7701111
Fax: +886-4-7700011
Contact Person: Luke Shu