(4) Especially for the cleaning of pneumatic high-pressure ball valve, the solvent used shall not conflict with the clear accessories, nor shall it be corrosive solvent. If it is a special gas ball valve, it should be cleaned with gasoline. As for other parts, they can be washed with ordinary clean water. During the cleaning process, attention should be paid to the need to thoroughly clean the residual dust, stains, oil stains and other attachments. Please ensure that the valve body and other parts are not damaged, and then use some detergent to complete the cleaning task. Of course, the assembly work can be carried out only after the detergent is completely cleaned. 　　　　

Generally speaking, the hardware valve industry in China has a good development trend, which is hidden under the surface. Two major problems concern business owners and need to be solved urgently. On the whole, the price of hardware valves in China is relatively stable. Although it rises and falls slightly every year, the range is very small. In the valve market in North China, it was found that many enterprises were shoddy for profit, which seriously disrupted the valve market. The main problems in the valve market are:
1、 Some operators who purchase a factory without name and address will print famous brands and certificates of quality of well-known manufacturers, which will cause serious damage to the reputation of qualified valve enterprises.
2、 Refurbishment of valves, some operators re paint waste valves for the second time after sales, bringing serious safety risks to the project quality. With the transfer of oil development to inland and offshore oilfields, and the development of the power industry from thermal power of less than 300000 kilowatts to thermal power, hydropower and nuclear power of more than 300000 kilowatts, the performance and parameters of the equipment should also be changed according to the changes in its application fields. The urban construction system generally uses a large number of low-pressure valves, and is developing towards environmental protection and energy conservation, that is, from the low-pressure iron gate valve used in the past to the environment-friendly rubber plate valve, balance valve, metal sealed butterfly valve and midline sealed butterfly valve. Oil and gas transmission projects are developing towards pipelining. In terms of energy conservation, steam traps should be developed and developed to high parameters of subcritical and supercritical. The construction of the power station is developing towards large scale, so large diameter and high pressure valves are required, as well as quick opening and closing valves. The need for complete sets of projects has developed from a single variety to multiple varieties and specifications. There is a growing trend that all valves required for a project are provided by one valve manufacturer.