DN is what mean?DN is refers to the nominal diameter of pipeline, note: this is not a outside diameter or not inside diameter; Should be related to pipeline engineering development initial period and the English unit; Is often used to describe the galvanized steel pipe, its corresponding relationship with English unit is as follows: in charge of: 4/8 of an inch: DN15; In charge of: 6/8 of an inch: 3/4 '; 1 inch pipe, 1 inch: DN25; Inch pipe: 1 1/4 inch again: DN32;inch and a half pipe: 1 1/2 inches: DN40; Two inch tube: 2 inches: (;3 inch pipe: 3 inches: DN80 ( Many places are marked as DN75) ; 4 inch pipe: 4 inches: DN100; What is the meaning ofDe?De mainly refers to the pipe diameter, generally adopt De annotation, all need to mark as the form of outer diameter X thickness; Mainly used for description: seamless steel tube, PVC and other plastic pipe, and other wall thickness of the pipes need to be clarified. Galvanized welded steel pipe as an example, with DN, De two annotation methods are as follows: 3/4 'De25 x 2. 5 mmDN25 De32 x 3 mmDN32 De40 x 4 mmDN40 De50 x 4 mm DNwe are used to use to indicate welded steel pipe, in the case of has nothing to do with wall thickness pipe is rarely used De to indicate; But plastic is another matter; Is associated with industry habits, we briefly addressed in the process of actual construction 20, 25, 32 pipe are refers to De, such as not a DN, here is a specification? Don't understand easily in the process of procurement and construction.the connecting way of two kinds of pipe material is: threaded connection and flange connection. With little other connection way.galvanized steel pipes, PPR tube can adopt the above two kinds of connections, is less than 50 pipe thread is more convenient, more than 50 with flange are more reliable.note: if it is two different materials of metal pipes, want to consider whether it will generate galvanic cell reaction, otherwise it will accelerate the corrosion rate of active metal pipe, good want to use flange connection, and the rubber gasket type of insulation material will be separated two kinds of metals, including bolt with a gasket space, avoid contact with.De, DN, d, ф said areas! De- - - - - - - DN - PPR, PE pipe, pp pipe diameter - - - - - - Polyethylene ( PVC) Pipe, cast iron, gangsu composite tube, galvanized steel pipe nominal diameterd - a - - - - - - Concrete pipe nominal diameterф - - - - - - - Seamless steel pipe nominal diameter, as its specifications, such as ф 100:DN15-108 x 4 ф22mm DN20 - ф27mm,DN25 - ф34mm，DN32- ф42mm,DN40 - ф48mm DN50 - ф60mm,DN65 - ф76 ( 73). mm，DN80- ф89mm,DN100 - ф114mm DN125 - ф140mm,DN150 - ф168mm DN200 - ф219mm,DN250 - ф273mm DN300 - ф324mm,DN350 - ф360mm DN400 - ф406mm,DN450 - ф457mm DN500 - ф508mm,DN600 - ф610mm DN15 - ф18mm,DN20 - ф25mm DN25 - ф32mm,DN32 - ф38mm DN40 - ф45mm,DN50 - ф57mm DN65 - ф73mm,及- ф89mm DN100 - ф108mm,DN125 - ф133mm DN150 - ф159mm,DN200 ф219mm DN250 - ф273mm,DN300 - ф325mm DN350 - ф377mm,DN400 - ф426mm DN450 - ф480mm,DN500 - ф530mm DN600 - ф630mm。piston pressure reducing Industrial Valves, power station valve manufacturers preferred 'era of base.ZJY46H piston type pressure reducing valve is a new 7 series of products, developed by XFY46H combined pressure reducing valve in the 90 s.compared with similar products, ZJY46H piston type pressure reducing valve with high pressure, high flow rate, inlet pressure strong adaptability, low noise, long life and other advantages of obtaining customer high praise. Widely used in hydropower station and pumping station at home and abroad, and mine deep well. For example, lijiaxia, orb temple, natural arch, xiaolangdi, goupitan, xiangjiaba, etc.product scope of supply: diameter: (- DN500; Pressure rating: 1. 6MPa- 6. 4 mpa

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