The development of control valves has a history of 80 years since the beginning of the 20th century, and ten categories of control valve products, self-operated valves and positioner control valves have been produced successively. The development process of control valves and control valves is as follows: 1920s : The original regulating valve for stable pressure came out. 1930s: V-shaped regulating ball valve
with V-notched double seat valve and single seat valve as the representative products came out. 1940s: Positioners appeared, and new varieties of control valves were further produced, such as diaphragm valves, angle valves, butterfly valves, ball valves, etc. 1950s: Ball valves were widely used, and three-way valves were put into the system instead of two single-seat valves. In the 1960s: After the above-mentioned products were serially improved, designed, standardized and standardized, a complete series of products was available in China. The seven products of single seat valve, double seat valve, angle valve, three-way valve, diaphragm valve, butterfly valve and ball valve that we are still using are still the products of the 1960s level. At this time, foreign countries began to launch the eighth structural control valve - sleeve valve. 1970s: Another product with a new structure, the eccentric rotary valve, came out (the ninth type of structure regulating valve). During this period, the sleeve valve was widely used abroad. In the late 1970s, the domestic joint design of the sleeve valve, so that China has its own sleeve valve product series. 1980s: During the period of reform and opening up, China successfully introduced petrochemical equipment and regulating valve technology, so that sleeve valves and eccentric rotary valves have been popularized and used, especially sleeve valves, which have the potential to replace single and double seat valves. more and more widely. In the late 1980s, another major development of the control valve was Japan's Cv3000 and fine and small control valves. In terms of structure, they changed the single-spring pneumatic diaphragm actuator to a multi-spring diaphragm actuator. The structure of the valve is only an improvement, not a change. . Its outstanding feature is that the weight and height of the regulating valve are reduced by 30% and the flow coefficient is increased by 30%. 1990s: The focus of regulating valves in the 1990s was on the research, improvement and improvement of reliability and special and difficult products. By the end of the 1990s, Hualin Company launched the tenth structure of the product - full-featured ultra-light valve. Its outstanding features are breakthroughs in reliability, functionality and weight. Breakthrough in function - the only product with full functions, therefore, many products with incomplete functions can be replaced by one product, which simplifies selection, use and variety; breakthrough in weight - more than the leading product list. Poppet valve, double seat valve and sleeve valve are 70-80% lighter, which is 40-50% lighter than that of fine and small valves; a breakthrough in reliability - solving various unreliable factors such as traditional control valves, such as reliable sealing performance, reliability of positioning, reliability of action, etc. The advent of this product has brought China's control valve technology and application level to the advanced level in the late 1990s; it is a major breakthrough in the control valve; especially the electronic full-function ultra-light valve, will definitely become the next century control valve. mainstream.
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