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    Yangquan valve Limited by Share Ltd

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    (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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