July 4, 2013, the first car of the country, four standard diesel car in Chengdu officially arrived in Chengdu on sale. It is understood that the first batch of diesel engines used in the country's four diesel engines was transferred from Dalian PetroChina Sichuan Branch. The first batch of Guozi Diesel will be sold at three pilot gas stations in Chengdu, namely the Chengdu West First Gas Station in the main city, the Banqiao gas station in Shuangliu, and the transportation gas station in Chongzhou. The price was provisionally set at 7.71 yuan/liter after approval by the Provincial Development and Reform Commission. According to the relevant person in charge of CNPC, the sale of Guosi Diesel was mainly based on current urban emission requirements in Chengdu. According to the requirements of the Chengdu Environmental Protection Bureau, any diesel vehicles with compression-ignition engines (diesel vehicles) and heavy-duty ignition engines (heavy-duty gasoline vehicles) that do not meet the requirements of the National IV emission standards will not be sold or registered since July 1, 2013. "Taking into account the needs of the owners of the National IV emission standard diesel vehicles, we specially arrange these three sites to facilitate the owners to refuel," said the person in charge.
Selection and precautions of hydraulic cylinders for excavators
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The hydraulic cylinder of an excavator is one of the important components, which converts hydraulic energy into mechanical energy,
Drive mechanical movement. When purchasing hydraulic cylinders for excavators, the following points should be noted:
1. Size and quality: The size and quality of the excavator hydraulic cylinder should match the model and specifications of the excavator to ensure its normal operation.
2. Pressure and flow rate: The pressure and flow rate of the excavator hydraulic cylinder should match the requirements of the hydraulic system,
To fully utilize the capabilities of the hydraulic system.
3. Sealing performance: The hydraulic cylinder of the excavator has good sealing performance to avoid hydraulic oil leakage or entering the mechanical interior.
4. Durability: The hydraulic cylinder of the excavator has good durability and can withstand long-term heavy load work.
5. Brand and Quality: Choose well-known excavator hydraulic cylinders to ensure their quality and after-sales service