Basic knowledge of regulating valve
The control valve is one of the important parts of the automation of the production process, driven by compressed air or electricity, accepts the signal sent by the regulation instrument, changes the pressure, temperature, flow and other control parameters of the medium, so that the production is arranged according to the predetermined requirements, and realizes the automation of the production process.
The regulating valve is divided into self-operated regulating valve according to the driving method, that is, the use of the medium’s own energy to achieve the automatic adjustment of pressure, temperature and flow, such as self-operated pressure regulating valve, self-operated temperature regulating valve, self-operated differential pressure regulating valve, self-operated micro-pressure regulating valve and so on. Pneumatic control valve with compressed air as power. Electric regulating valve, with electricity as power. Electro-hydraulic control valve, manual control valve, intelligent control valve. According to the upper valve cover form is divided into ordinary type, heat dissipation type, long neck type, bellows seal type. According to the flow characteristics are divided into straight line, equal percentage, parabola, fast opening. According to the spool action form is divided into straight stroke, Angle stroke. According to the regulation form, it is divided into regulation type, cut off type, and regulation cut off type. According to the shape of the spool, it is divided into flat spool, plunger spool, window spool, sleeve spool, multi-stage spool, rotary spool, butterfly spool, ball spool. Commonly used are single-seat regulating valve, two-seat regulating valve, sleeve regulating valve, Angle regulating valve, three-way regulating valve and so on.
The development of regulating valves is rapid, and there are constantly new varieties developed according to new process requirements, such as intelligent regulating valves, ultra-small flow regulating valves and so on.