By the pneumatic valve working principle and selection principle of 2)

also known as the cutting brake pneumatic valve is one of the most widely used pneumatic valve, it is popular, because the opening and closing process of sealing surface friction between the small, durable, highly open small, easy to manufacture, maintenance is convenient, not only for depression, but also for high blood pressure.
the principle of pneumatic valve closed, relying on the pneumatic valve rod pressure, pneumatic valve sealing surface with pneumatic valve seat sealing surface, in order to prevent the flow of medium.
one-way pneumatic valve can only be installed, the medium flow direction. Its structure is better than brake the length of the pneumatic valve, fluid resistance small, long-term operation, the seal reliability is not strong.
pneumatic valve is divided into three categories: direct pneumatic valve, pneumatic valve Angle, tilt dc type pneumatic valve.
one of the most obvious advantage is: in the process of opening and closing of the pneumatic valve seal than the friction between the pneumatic valve body surface is small, so wear and tear. The height of the seat usually only/opening diameter, than before the door. Usually in the pneumatic valve and pneumatic valve only a sealing surface, thus better manufacturing process, easy to maintenance.
the rated pressure pneumatic valve and pressure, the PN. Such as - 。 MPa, ANSI grade class - , Japan JIS - K, nominal diameter or caliber: DN? , nuclear power source /? ', by the pneumatic valve connection mode: flange, welding, thread, applicable temperature: - ℃? ℃, pneumatic valve actuation device: a manual, bevel gear, pneumatic, electric, hydraulic, pneumatic, hydraulic, electric hydraulic linkage, car body materials: WCB, ZGCrNiTi ZGCrNiMoTi, CF ( ） , CF ( L stainless steel) CFM ( ） CFM ( ） And titanium. Pneumatic valve material selection is different, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media. Pneumatic valve closing (
Pneumatic disc) Move along the center line of the pneumatic valve seat. According to the pneumatic valve, pneumatic valve seat moving mode by changing the mouth is proportional to the pneumatic valve stroke. So pneumatic open or close the valve stem travel relatively short, but very reliable cutting function, and the mouth of the pneumatic pneumatic valve seat and the schedule of change is proportional pneumatic valve, flow control is very appropriate. Therefore, this type of cut or adjust, pneumatic valve and throttle.
the selection principle of pneumatic valve is:. High temperature, high pressure piping or equipment should be chosen in the pneumatic valve. Coal-fired power plant, nuclear power plants, petrochemical systems, high temperature, high pressure pipe. 。 Pipe flow resistance and pipeline strictly. The pressure loss of consideration, is the place. 。 A small pneumatic valve can use a needle, pneumatic valve, pneumatic valve, sampling pressure pneumatic valve. 。 A flow control or pressure adjustment, but not adjustment precision and pipe diameter and relatively small, such as pipe by the way, in the name of the mm or less should be chosen. 。 For large and small chemical fertilizer industry to produce synthesis should be used in the name of the PN PN nominal pressure PN MPa or MPa pressure or pressure Angle as pneumatic valve Angle by the pneumatic valve. 。 Bayer alumina desilication plant, coke pipeline is easy, easy to use a separate body, can take seat, dc carbide sealed pneumatic valve pneumatic valve or once-through deadline. 。 Urban construction, water supply, heating engineering, from small, by the pneumatic valve, pneumatic balance valve or piston pneumatic valve such as name, choose the nominal pipe less than mm pipe.