Valve review  What is a valve? The valve is now defined as a control component in the fluid delivery system with functions of diversion, shut-off, regulation, throttling, backflow prevention, split or overflow relief. As an important control component of pipelines, valves are widely used in various sectors of the national economy such as petroleum, chemical, metallurgy, natural gas transmission, power stations, and urban water supply.  Below, we will further introduce the knowledge of the valve. Nominal size ( DN ) The following nominal size DN value is a standard GB/T 1047 - 2004 standard DN : Size identification for the combination of letters and numbers for piping system components. It consists of the letter DN followed by a dimensionless integer number. This number is directly related to the feature size such as the aperture or outer diameter (unit: mm ) of the end connector . The preferred DN values ​​are as follows DN 6 DN 100 DN 700 DN 2200 DN 8 DN 125 DN 800 DN 2400 DN 10 DN 150 DN 900 DN 2600 DN 15 DN 200 DN 1000 DN 2800 DN 20 DN 250 DN 1100 DN 3000 DN 25 DN 300 DN 1200 DN 3200 DN 32 DN 350 DN 1400 DN 3400 DN 40 DN 400 DN 1500 DN 3600 DN 50 DN 450 DN 1600 DN 3800 DN 65 DN 500 DN 1800 DN 4000 DN 80 DN 600 DN 2000   Nominal pressure ( PN ) The following nominal pressure PN values ​​are based on the GB/T 1048 - 2004 standard. PN : Identification of the combination of letters and numbers used for reference, related to the mechanical properties and dimensional characteristics of piping system components. It consists of the letter PN followed by a dimensionless number The PN value should be selected from the following series DIN series ANSI series PN2.5 PN20 PN6 PN50 PN10 PN110 PN16 PN150 PN25 PN260 PN40 PN420 PN63  PN100  Note: Other PN values are allowed if necessary.  Valve type preparation method 1 2 3 4 5 - 6 7  1 , type code 2 , drive mode code 3 , connection form code 4 , structural form code 5 , sealing surface material or lining material code 6 , pressure code or working pressure at working temperature 7 , valve body material code  Valve type code Valve type Code Valve type Code Safety valve A Ball valve Q Butterfly valve D Traps S Diaphragm valve G Regulating valve T Check valve H Plunger valve U Shut-off valve J Plug valve X Throttle valve L Pressure reducing valve Y Drain valve P gate Z  Representation code for valves with other functional functions Second function name Code Second function name Code Low temperature type D Slow-closing type H Insulation type B Slag discharge type P Bellows type W Purge type C Telescopic flange type S Fireproof F V -shaped ball V Fast type Q  Corner code with a special structure valve Specific structure name Code Specific structure name Code Knife type slab gate valve D Water seal type S With diversion gate valve K Without guide hole type gate valve W  Drive mode code Drive mode Code Drive mode Code electromagnetic 0 Bevel gear 5 Electromagnetic-hydraulic 1 pneumatic 6 Electro-hydraulic 2 Hydraulic 7 turbine
The installation of the countertop basin is easy, as long as the hole is opened on the countertop. There are a variety of sink edge designs for over-counter basin sink styles to choose from. It is necessary to ensure that the connection gap between the sink and the countertop is uniform, and there is no water seepage.
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