What are the good manufacturer electric pneumatic control valve products?

What are the good manufacturer electric pneumatic control valve products? Electric pneumatic - valve widely used in the precise control of gas, liquid, steam and other medium parameters such as pressure, flow, parameters such as temperature, liquid level in a given value. Nowadays, more and more manufacturing electric, pneumatic control valve factory, but due to the technological level of each, but can't just pick one, just because the price reason not only can guarantee the quality of the products, and also no guarantee after-sales. But for the choice when buy formal manufacturers, and then according to their needs for their own family. Electronic single-seat pneumatic control valve, is made up of straight travel all electronic electric actuators and top guide through low flow resistance of single seat valve. With compact structure, light weight, action quick, fluid channels in an s-shaped streamlined, small pressure drop loss, large capacity of valve, precise flow characteristic, directly to adjust the instrument input ( 4 - 20mA DC 0- 10 ma DC or 1 - 5 v直流) Such as control signal and single-phase power supply can control operation, realize the process of the pipeline automatic adjustment control, electric pneumatic regulator in the industry is very important, it exists to promote the progress and development of many industries. As in the field of industrial automation degree is higher and higher, is being more and more application in the field of all kinds of industrial production. Compared with traditional pneumatic pneumatic - valve has obvious advantages: energy saving (electric pneumatic regulator Only electricity when at work) , environmental protection, No carbon emissions) Fast installation, convenient, No need for complicated pneumatic pipe and pump stations) 。 Valve by their ticket enforcement agencies use the power, according to its functions and features are divided into linear features, such as percentage and parabolic characteristics of three. Warm prompt: the development of science and technology, electric pneumatic - valve product performance is improved greatly. More and more manufacturers in product manufacturing, but at the time of purchase products, not only to reference price, more important is to reference the quality and service in the future.