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        Yangquan valve Limited by Share Ltd

        Consultative:400-003-1469

        Electricity: (0353) 2591440 (0353) 2591441

        (0353) 2590751 (0353) 2590307

        Address: No. 366 new road, Yangquan City, Shanxi Province

        True: (0353) 25914692591781

        Mail code:045000

        E-mail:yqfm@sina.com



        Your current location :Home>Technology>Valve knowledge
        Technology

        Valve knowledge

        What is Valve?

        Valve is a control component in fluid delivery system with the diversion, closure, adjustment, throttle, prevent backflow, diversion or overflow relief functions. As an important pipeline control components, valves are widely used in petroleum, chemical, metallurgy, power stations, natural gas transportation, urban water supply and various departmentsof national economy.

        Nominal dimension (DN)

        The following DN value is according to GB/T 1047-2004 standard

        DN: Size designation of letters and numbers combination for piping system components. It consists of the letters DN followed by dimensionless integer numbers. This number is directly related to the diameter (unit: mm) of end connector.

         

        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 PN value is according to GB/T 1048-2004 standard

        PN: Relate to mechanical property and dimensional characteristic of piping system components, identification of letters and numbers combination for reference. It consists of the letters PN followed by dimensionless numbers.

         

        PN values should choose from following series

         

         

        DIN series

        ANSI series

        PN2.5

        PN20

        PN6

        PN50

        PN10

        PN110

        PN16

        PN150

        PN25

        PN260

        PN40

        PN420

        PN63


        PN100


         

        Remark: Allow to use the other PN values when necessary

        The organizing method of valve model

         

        1

        2

        3

        4

        5

        6

        7


        1、Type code

        2、Drive method code

        3、Connection type code

        4、Design feature code

        5、Sealing surface material or lining material code

        6、Pressure code or working pressure under operating temperature

        7、Valve body material code

         

        Valve type code

         

        Valve type

        code

        Valve type

        code

        Safety valve

        A

        Ball valve

        Q

        Butterfly valve

        D

        Steam trap valve

        S

        Diaphragm valve

        G

        Regulating valve

        T

        Check valve

        H

        Plunger valve

        U

        Globe valve

        J

        Plug valve

        X

        Throttle valve

        L

        Relief valve

        Y

        Blowoff valve

        P

        Gate valve

        Z

         

         

        Code of valve with other function

         

         

        Second function name

        code

        Second function name

        code

        Low temperature type

        D

        Slowly-closed type

        H

        Heat preservation type

        B

        Slagging type

        P

        Bellows type

        W

        Sweeping type

        C

        telescopic flange type

        S

        Fireproof type

        F

        V-shape ball type

        V

        Fast type

        Q

         

        With the specific structure of valve angle code

         

         

        Specific structure name

        code

        Specific structure name

        code

        Knife type flat-plate gate valve

        D

        Water seal type

        S

        with diversion hole type gate valve

        K

        without diversion hole type gate valve

        W

         

         

        Drive method code

         

         

        Drive method

        code

        Drive method

        code

        Electro magnetic

        0

        Bevel gear

        5

        Electro magnetic - hydraulic

        1

        Pneumatic

        6

        motor - hydraulic

        2

        hydraulic

        7

        turbine

        3

        Pneumatic-hydraulic

        8

        Spur gear

        4

        Motor driven

        9

         

         

        Remark: 1. Code 1, code 2, code 8 is used in the valve opening and closing time, need to have two kinds of power to operate the valve at the same time.

        2. Safety valve, hydraulic valve, water conveyance valve, valve of manual hand wheel directly connected to the valve stem operating structure type, this code omitted said.

         

        3. For the pneumatic or hydraulic: 6K, 7K represent normally open type; 6B, 6B represent normally close type; 6S represent pneumatic hydraulic, 9B represent anti-explosion motor driven

        Connection type code

         

        Connection type

        code

        Connection type

        code

        internal thread

        1

        weld

        6b

        external thread

        2

        wafer

        7

        flange

        4

        clamped

        8

        Socket weld

        6s

        sleeve

        9

         

        Sealing surface or lining material code

         

        Sealing surface or lining material

        code

        Sealing surface or lining material code

        code

        Tin-based bearing alloy (babbitt mental)

        B

        Nylon plastic

        N

        enamel

        C

        Boriding steel

        P

        Nitrided Steel

        D

        Lead lining

        Q

        fluoroplastic

        F

        austenitic stainless steel

        R

        ceramic

        G

        plastic

        S

        Cr13 series stainless steel

        H

        Copper alloy

        T

        Rubber lining

        J

        rubber

        X

        Monel metal

        M

        Hard alloy

        Y

         

        Remark: 1. when the seal surface material of seal pair is different, use hard density represent, except the Diaphragm Valves

        2. When the valve sealing material is the body material, sealing surface material of valve seat use W represent

        Valve body material code

         

        Valve body material

        code

        Valve body material

        code

        Carbon steel

        C

        ductile cast iron

        Q

        Cr13 series stainless steel

        H

        0Cr17Ni12Mo2 series stainless steel

        R

        1Cr5Mo chrome molybdenum steel

        I

        00Cr17Ni14Mo2 series stainless steel

        RL

        15CrMo chrome molybdenum steel

        H

        plastic

        S

        malleable cast iron

        K

        Copper and copper alloy

        T

        aluminum alloy

        L

        Titanium and titanium alloy

        Ti

        0Cr18Ni9 series stainless steel

        P

        chrome molybdenum vanadium steel

        V

        00Cr19Ni10 series stainless steel

        PL

        gray iron

        Z

         

        The examples of valve type and name organizing method

         

         

        1. electric, flange connecting, rising stem wedge double disc, valve seat seal surface material processed directly by valve body, PN1, valve body material is gray iron

        Z942W-1 electric wedge double disc gate valve

        1. manual, external thread connecting, floating straight-through, valve seat seal surface material is fluoroplastic, PN40, valve body material is 1Cr18Ni9Ti ball valve

        Q21F-40 P external ball valve

        1. pneumatic normally open type, flange connecting, weir structure and lining with rubber, PN6, valve body material is gray iron diaphragm valve

        G6K41J-6 pneumatic normally open type rubber lining diaphragm valve

        1. flange connecting, Vertical disc type, valve seat seal surface material is cast copper, valve clack seal surface material is rubber, PN2.5, valve body material is gray iron

        D741X-2.5 hydraulic butterfly valve

        1. electic welded connecting, straight-through, valve seat seal surface material is bead weld hard alloy, operating temperature 540℃ operating pressure 17.0MPa, valve body material chrome molybdenum vanadium steel globe valve

        J961Y-P54170V electric weld globe valve

        Valve material characteristicaccording to JB/T 53001991standard

         

        Valve body material

        Applicable PN/MPa

        Applicable temperature/℃

        Applicable medium

        Gray iron

        ≤10

        -10~200

        water, steam, air, gas, and oil etc.

        malleable cast iron

        ≤25

        -30~300

        water, steam, air, and oil etc.

        ductile cast iron

        ≤40

        -30~350

        water, steam, air, and oil etc.

        Copper alloy

        ≤25

        -40~250

        water, seawater, oxygen, air, and oil etc.

        Carbon steel

        ≤320

        -30~450

        water, steam, air, hydrogen, ammonia, nitrogen, and oil etc.

        High temperature steel

        ≤16

        ≤550

        steam and petroleum

        low temperature steel

        ≤64

        ≥-196

        ethylene, propylene, liquified natural gas, and liquid nitrogen

        stainless acid resistant steel

        ≤64

        ≤200

        nitric acid, acetic acid

         
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