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Company Name:Jiu Han Enterprise Co., Ltd.
Country/Region:Taiwan
Address:37, Alley 11, Lane 10, Chung Ming 11th St.
Zip/Post Code:701
Tel:886-6-2602755-9
Fax:886-6-2686564
Website:
http://www.autoparts-accessories.com
Contact Person1:Jason Wu
Job Title1:President
E-mail1:jiuhan88@gmail.com
Contact Person2:Mr. Wang
Job Title2:Sales Manager
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Valve Seat

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The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is closed. The valve seat is a critical component of an engine in that if it is improperly positioned, oriented, or formed during manufacture, valve leakage will occur which will adversely affect the engine compression ratio and therefore the engine efficiency, performance (horsepower), exhaust emissions, and engine life.

Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position,[1] and then machining a conical-section surface into the valve seat that will mate with a corresponding conical-section of the corresponding valve. Generally two conical-section surfaces, one with a wider cone angle and one with a narrower cone-angle, are machined above and below the actual mating surface, to form the mating surface to the proper width (called "narrowing" the seat), and to enable it to be properly located with respect to the (wider) mating surface of the valve, so as to provide good sealing and heat transfer, when the valve is closed, and to provide good gas-flow characteristics through the valve, when it is opened.


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Place of Origin: Taiwan
Sales Method: Export
Payment Term: T/T

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Jiu Han Enterprise Co., Ltd.

JIU HAN ENTERPRISE CO., LTD. founded in 1989, our main business is importing and exporting auto parts. In the field of automotive lighting with professional experience for decades, our members of employees are 5 to 10. J JIU HAN ENTERPRISE CO., LTD. the main product for all types of automotive lamps. Halogen bulb series include H1 ~ H13, 9000 series 9004 ~ 9007, 800 series 880 ~ 896. JIU HAN ENTERPRISE CO., LTD. existing customers are all over the world. The major domestic customers are lamp makers in the southern Taiwan. Foreign customers are mainly in the Middle East, North America, South America, Europe around the world. Our goa..
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