Engine Valve parts,Original Engine Intake Valve,Engine Exhaust Valve,Original Engine valve,Engine valve Set 1D auto parts , https://www.1dauto.com
Last month, the Shanghai plate price rose slightly again. In July, the lowest price of license plates was 57,700 yuan per piece, and the average transaction price was 58,271 yuan per piece. This year, the Shanghai brand rebounded again after falling for the first time in June, but the increase was very limited. The new measures will not be transferred within three years after the new motor vehicle quotas are used. It has already begun to show effectiveness in restraining excessively high and excessively high prices for new motor vehicle quotas.
We learned from the used car market that the quoted price of the second-hand Shanghai brand is around RMB 63,800/Zhang. A used car dealer said that with the imminent arrival of the auction day this month, the used license plate price will drop by a small amount of one or two hundred yuan.
In August, private and private bus taxi auctions will be held on the next Saturday (18th) in the morning with quota of 9,500, which is the same as in July. At present, the quotation of the second-hand Shanghai brand is around RMB 63,800/Zhang.
The role of the valve is specifically responsible for the input of air into the engine and exhaust the exhaust gas after combustion. From the engine structure, it is divided into intake valve and Exhaust Valve.
The role of the intake valve is to draw air into the engine and mix it with the fuel to burn; The function of the exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.
The valve is composed of a valve head and a rod. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~1200K), but also withstand the pressure of the gas, the valve spring force and the transmission component inertia force, its lubrication, cooling conditions are poor, requiring the valve must have a certain strength, stiffness, heat and wear resistance.
The intake valve is generally made of alloy steel (chromium steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon chromium steel).
Sometimes in order to save heat resistant alloy, the exhaust valve head is made of heat resistant alloy, and the rod is made of chromium steel, and then the two are welded together.