Our fast-stop valves are well applied in fuel oil and fuel gas systems. Three-function valve occupies small room and has the same functions and a competitive price, only 1/5 of price compared with foreign valves. And it also has the advantage of convenient quality assurance. Pneumatic valve characterizes fast stop speed and convenient maintenance, thus the pneumatic three-function valve is suggested for the good choice. Compared with three-function valve, single valves, e.g.electric ball valve, pneumatic ball valve, pneumatic ball valve, pneumatic stop valve, though occupying much more front-furnace room, are easier for maintenance and replacement.