To define the parameters of the soft sealing gate valve

   Chinabase Machinery is a group of manufacturing facilities, offering one-stop solution for mechanical power transmission products in China. 

    Our product range also covers locking assemblies (clamping elements/locking device), taper bushes, QD bushes, bolt-on hubs,roller chain，roller chain，torque limiters, shaft collars,083-1 chain，motor bases and motor slides, chain detachers, chain guides, universal joint, rod ends and yokes.

    China couplings manufacturer & exporter, we specialize in: chain couplings, Jaw couplings, flexible couplings, HRC couplings, NM couplings, MH couplings, Pin coupling, Spacer Coupling, Flange Coupling, Sleeve Coupling, nylon sleeve coupling.

Parameter definition

   1 nominal diameter: (nominal diameter), also known as the average diameter (mean outside diameter), said the symbol DN, is the general caliber pipe and pipe accessories. The same nominal diameter of the tube and pipe accessories can connect with each other, with interchangeability. It is not a real sense of pipe diameter or diameter, although its value is closer with pipeline diameter or equivalent, in order to make the pipe, tube connection size uniform,with nominal diameter (also called nominal diameter, nominal diameter). 

Belt guides

    For example, according to the thickness of welded steel pipe can be divided into thin-walled steel, general steel and thicker steel. The nominal diameter is not a diameter, not diameter, but the approximate a diameter of ordinary steel pipe nominal size. Each of nominal diameter, corresponding to an outer diameter, the diameter values vary with thickness. Metric mm nominal diameter can be said, also available in English, said. Piping accessories is alsoexpressed with nominal diameter, meaning with tube.

     Nominal pressure: 2 (Nominal pressure), said the symbol PN, the maximum working pressure allowed when applied at a certain temperature. Control valve on the carbon steel body, to allow the maximum working pressure below 200 ℃ application; for iron body,to allow the maximum working pressure below 120 ℃ application;control valve on the stainless steel body, to allow the maximum working pressure below 250 ℃ application. When the t. When the temperature increases, the body of the pressure will be reduced.For example, the nominal pressure 6.4MPa (PN64) carbon steel for pressure control valve, 300 ℃ for 5.2MPa, 400 ℃ with a pressure of 4.1MPa, used for pressure at 450 ℃ for 2.9MPa. Therefore, to determine not only the nominal pressure control valve according to the maximum working pressure, also according to the maximum operating temperature and material characteristics, rather than simply meet the nominal pressure greater than the pressure of work.