Since my country started the heating metering reform in 2003, the heating metering reform has achieved remarkable results. By the end of 2012, the heating metering and charging area had reached 800 million square meters, and the proportion of newly built buildings with metering devices had reached more than 70%, and most users had saved heat bills. With the acceleration of urban development, people's requirements for the quality of life are also constantly improving. It can be seen that the development potential of my country's urban heating market is huge. Annual energy conservation, emission reduction and low-carbon development action" plan, which proposes that by 2015, the implementation rate of green building standards for new urban buildings in my country will reach 20%, and 500 million square meters of green buildings will be added. The goal of energy-saving renovation of 300 million square meters. At the same time, new buildings will be installed with metering devic...

When purchasing electric ball valves, only specifying the specifications, categories and working pressure to meet the purchasing requirements is not perfect in the current market economic environment. For the competition of products, the electric ball valve manufacturers carry out different innovations under the concept of unified design of electric ball valves, forming their own enterprise standards and product personality. Therefore, it is very necessary to put forward technical requirements in detail when purchasing electric ball valves, and coordinate with manufacturers to reach a consensus as an accessory of electric ball valve purchase contract.1. General requirements1.1 The specifications and categories of electric ball valves should meet the requirements of pipeline design documents.1.2 The model of the electric ball valve should indicate the requirements of the national standard number. If it is an enterprise standard, the relevant description of the model sho...

gate:Gate valve refers to the valve whose closing member (gate) moves along the vertical direction of the channel axis. It is mainly used to cut off the medium on the pipeline, that is, fully open or fully closed. In general, gate valves cannot be used to regulate flow. It can be applied to low temperature pressure or high temperature and high pressure, and can be used according to different materials of the valve. However, gate valves are generally not used in pipelines that transport mud and other media.Advantages: 1. Small fluid resistance; 2. Less torque required for opening and closing; 3. It can be used on the ring network pipeline where the medium flows in two directions, which means that the flow direction of the medium is not restricted; 4. When fully opened, the sealing surface is affected by the working medium. The erosion of the valve is smaller than that of the globe valve; ⑤ The body structure is relatively simple, and the manufa...