Directional control valves (DCVs) are one of the most fundamental parts of hydraulic and pneumatic systems. DCVs allow fluid flow (hydraulic oil, water or air) into different paths from one or more sources. DCVs will usually consist of a spool inside a cylinder which is mechanically or electrically actuated. The position of the spool restricts or permits flow, thus it controls the fluid flow.
The spool (sliding type) consists of lands and grooves. The lands block oil flow through the valve body. The grooves allow oil or gas to flow around the spool and through the valve body. There are two fundamental positions of directional control valve namely normal position where valve returns on removal of actuating force and other is working position which is position of a valve when actuating force is applied. There is another class of valves with 3 or more positions that can be spring centered with 2 working position and a normal position.
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Improve standardization work efficiency
In order to implement the "Several Opinions" and serve the revitalization of the machinery industry, Xiong Bilin said that the promotion of new industrialization depends on the support of standards. The implementation of a standard strategy to raise the standard of equipment manufacturing industry is of great significance to improving the overall competitiveness of equipment manufacturing industry and promoting the long-term healthy and stable development of equipment manufacturing industry. In recent years, great progress has been made in the standardization of the machinery industry. However, the speed of standard system revision cannot keep pace with the rapid development of the industry. The machinery industry must take effective measures to increase the efficiency of standardization work.
"Implementing the requirements of the "Several Opinions" on the standardization work is a long-term and arduous task. The government departments must strengthen promotion and guidance, give full play to the centralized management and coordination role of the industrial associations such as the Machinery Industry Federation, and do a good job. Implementation, standardization technical committee must be meticulously organized, give full play to the main role of the company.†Xiong Bilin pointed out that the machinery industry standardization in the “Eleventh Five-Year Plan†period, we must promote reforms, improve the market mechanism for standardization work; to speed up the pace, change the standard extended service status To strengthen management, ensure the orderly implementation of the standard revision plan; pay attention to training, improve the quality and level of standardization work; to strengthen cooperation, the standardization work with professional associations, quality inspection agencies, certification bodies organic integration; to do a good job Services, actively promote the implementation of standards, improve the effectiveness of standardization work.
Establish a major project supporting mechanism
Regarding the issue of the mechanism for standardization and innovation in the mechanical industry, Xiong Bilin pointed out that the standard system revision work must establish a supporting mechanism for major projects, that is, to carry out supporting standard feasibility studies for the major technical equipment R&D projects identified by the state, and strive to incorporate standard research and development into the project. The plan will regard product standards as an important part of new product appraisal, and synchronize the development of key industrial core technologies, key technology development and standards development.
At the same time, the standard must strengthen the combination of standardization and research and development work during the process of revision and revision, so that the proportion of independent innovation technology and transformation of scientific and technological achievements in the standard will be significantly improved. It is necessary to attach importance to the formulation of resource conservation standards, increase the energy efficiency standards for industrial equipment, the standards for the utilization of wastewater, and the proportion of material standards; the standard revision work should be intensified so that the standard can be fully adapted to the level of production of mechanical equipment products and components.
Xiong Bilin emphasized that the standard revision and revision work should aim at the large-scale clean and high-efficiency power generation equipment, UHV AC and DC power transmission complete sets of equipment and large-scale thin-plate hot and cold continuous rolling complete sets of equipment, which are determined by the “Several Opinions†and are directly related to the standardization of the machinery industry. Plating layer processing equipment, large-scale coal mining and large-scale open-pit mining equipment, large-scale environmental protection equipment and comprehensive utilization of resources, large-scale rock tunnelling machines and other large construction machinery, major engineering automation control systems, large-scale precision high-speed CNC machine tools, new high-power Breakthroughs have been achieved in nine areas such as agricultural equipment, which provide standard support for these major technical equipment and products that have played a leading role in structural adjustment and industrial upgrading.
At the recent national machinery industry standardization work conference, Xiong Bilin, deputy director of the Industry Development Department of the National Development and Reform Commission, pointed out that the “State Council’s opinions on accelerating the revitalization of the equipment manufacturing industry†clearly defined the goals and priorities of the revitalization of the equipment manufacturing industry and are closely related to the standardization work. . In order to implement the "Several Opinions", the standardization work of the machinery industry should take the innovation mechanism, key breakthroughs, overall improvement and improvement systems as the core tasks.