As the selection of pneumatic valve and operations

the pneumatic valve is closed a pneumatic valve, pneumatic seat along the center line of the mobile pneumatic valves. According to the mobile form of pneumatic valve, pneumatic valve seat with pneumatic disc change in his itinerary directly proportional relationship. Because this pneumatic valve open or close the pneumatic valve stem travel relatively short, and very reliable cutting function, and due to the change of pneumatic seat his trip proportional relationship with the pneumatic valve, is very suitable for the traffic regulation. Therefore, this type of pneumatic valves are well suited for use as cut off or adjust and throttling.
as pneumatic valve its selection principle is:
, high temperature and high pressure medium or device appropriate chooses the pneumatic valve. Such as power plants, nuclear power stations, petrochemical system of high temperature and high pressure piping.
and piping for the pipeline resistance is relaxed. Thinking about small place of pressure loss.
and small pneumatic valve needle optional pneumatic valve, pneumatic valve, the sampling instrument pneumatic valve pneumatic valve, pressure gauges, etc.
, there is flow control or pressure adjustment, but the adjustment accuracy is not high, and the pipe diameter is small, such as nominal menstruation mm or less on the pipeline, appropriate chooses.
and synthetic fertilizer and chemical fertilizer in the industrial production appropriate chooses nominal pressure PN MPa or PN nominal pressure, nominal pressure of MPa pressure Angle as air throttle valve or high pressure Angle type pneumatic valve.
and desilication in bayer process of alumina production workshop, easy to coking on the pipeline, easy to use pneumatic valve body separated type, pneumatic valve seat place, carbide seal once-through stop pneumatic valve or once-through throttling valve
the water supply, heating, urban construction engineering, nominal menstruation smaller pipe, can be used as pneumatic valve, balanced or plunger pneumatic valve, such as nominal drift diameter less than on the pipeline of mm. One of the most obvious advantage is: in the process of opening and closing, the pneumatic valve in the pneumatic valve sealing surface friction than the brake in the pneumatic valve is small, and wear resistance. Opening channels are generally only for pneumatic seat diameter /, so much smaller than the pneumatic valve gate. Usually on the pneumatic valve body and disc only a sealing surface, thus making craft is good, easy to maintenance. Nominal pressure or stress, PN. - 。 MPa, ANSI类- 、JIS- K or caliber: nominal diameter DN ~, NPS / ~ 'connection mode: flange, butt welding, thread and other applicable temperature: - Drive mode: ℃ ~ ℃, pneumatic, electric, hydraulic, pneumatic hydraulic linkage, pneumatic valve body material: WCB, ZGCrNiTi, ZGCrNiMoTi, CF ( 、CF( L、CFM( 、CFM( L、Ti。 Choose different material, can be respectively suitable for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea, and other media.
to stop pneumatic valve, not only to install and maintain, but also will be operating.
by the pneumatic valve, opening and closing force should be smooth, no impact. Some impact open/close the high-pressure pneumatic valve parts is considered as the the impact and generally by the pneumatic valve can't wait.
when stop pneumatic valve fully open, should reverse a little hand wheel, the tightness between the screw thread, so as to avoid looseness damage.
at the beginning of the line, internal dirt is more, by the pneumatic valve can be tiny qi, using high speed flow of medium, it washed away, then gently close ( Cannot be quickly closed, slammed shut to prevent residual impurities task of sealing surface) , once again open, repeat many times, clean dirt, back into work.
normally open by the pneumatic valve, sealing surface may stick with dirt, closed and want to use the method to be washed clean, and then formally locked.
if the handwheel, handle the damage or loss, shall be immediately to match neat, do not replace with adjustable wrench, so as not to damage the pneumatic valve stem, opening and closing is ineffective, so that accidents in production.
some medium, in the pneumatic valve closed cooling, shrink pneumatic valve parts, operators should be in the appropriate time to close it again, let the sealing surface crack, leaving no otherwise, medium thin seam high-speed flow, it is easy to erosion seal face.
operation, such as found too difficult operation, the reason should be analyzed. If the packing is too tight, can relax appropriately, such as pneumatic valve stem skew, personnel shall be notified to repair. Some by the pneumatic valve, when closed, closed heat expansion, open the difficulties; If must open at this time, can be pneumatic valve cover screw loosen to half a circle a circle, eliminate stress, pneumatic valve stem and plate hand wheel.