First, should act according to the product model which the sample arranges in order to carry on the shaping ordering. If has the request or the change in addition to below each item, all should perform in the ordering contract to explain.
1、Valve pressure rank.
Nominal pressure PN/MPa,Kilogram strength Kgf,Pound level CL,British system PSl
2、Valve specification.
3、Connection form. The thread, receives inserts, the butt welding, Wrap and the flange connection.
4、The valve structural length carries out the standard.
5、Valve structural style. (Goes nonstop to, angle type)
6、Valve major parts material. (Or fluid medium performance)
Second, every is the butt welding (BW) and Wrap the connection form, must in the ordering contract either in the specification wrote plainly butt welding or Wrap takes over control the specification (including pipe outer diameter and wall thickness).
Third, GB code and the beautiful sign receive inserts (SW) the hole size and the thread end size.
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Specification
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Receives the jack size
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Thread end size T (British system)
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China JB
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US ANSI
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China GB
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US ANSI
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DN
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NPS(m)
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S
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L1
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S
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L1
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T1(Metric system)
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G,Rc
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NPT
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6(8)
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1/4
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14.5
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10
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14.1
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10
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M20X1.5
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1/4
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10
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3/8
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18.4
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10
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17.55
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10
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M24X1.5
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3/8
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15
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1/2
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22.5
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10
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21.7
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10
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M30X2
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1/2
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20
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3/4
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28.5
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11
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27.05
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13
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M36X2
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3/4
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25
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1
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34.5
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12
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33.8
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13
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M42X2
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1
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| Note: G is the non- thread seal tube thread; GB7307 Rc seals tube thread (circular cone with the thread inside thread) the tooth shape angle 55°; GB7306 NPT tooth shape angle 60°. ANSIBl 20.1 |
Fourth, valve material sketchy choice
First, carbon steel: Is suitable to nominal pressure ≤ 32. OMPa, the temperature is -30-425 ℃ medium and so on water, steam, air, hydrogen, ammonia, nitrogen and petroleum product. The commonly used trademark is fine steel 20#, 25# and so on.
Second, copper alloy: Is suitable to PN ≤ 2. medium and so on 5MPa water, sea water, oxygen, air, oil quality, as well as the temperature -40-250 ℃ steam medium, the commonly used trademark is H62, Hpb59-1 (brass) and so on.
Third, high temperature steel: Is suitable to nominal pressure PN ≤ 17. OMPa, the temperature ≤ 570 ℃ steam and the petroleum product. The commonly used trademark is Cr5Mo, 12CrlMoV and so on.
Fourth, the low temperature steel, is suitable for nominal pressure PN ≤ 6. 4MPa, a temperature ≥—196 ℃ second grade is thin, the propylene, the liquid state natural gas, medium and so on fluid nitrogen, the commonly used trademark is 1Crl8Ni9, OCrl8Ni9, 1Crl8Ni9Ti, OCrl8Ni9Ti and so on.
Fifth, the stainless acidproof steel, is suitable for nominal pressure PN <= 6. 4MPa, the temperature <= 200 ℃ nitric acids, medium and so on acetic acid, the commonly used trademark is OCrl8Ni9Ti, OCrl8N gate 0< bears the nitric acid >, OCrl8N gate 2M02Ti, 1Crl8NJl2M02Ti< are acidproof and the urea > and so on.
The valve body, the valve cover (attachment) and the valve petal is one of valve major parts, directly withstands the medium pressure, uses the material to conform to "the valve pressure and the temperature
Rank "stipulation.
Fifth, operating instructions
1、The measuring appliance valve opens using of the closed pipe path in the measuring appliance measuring channel system, including: The power plant measuring appliance is a valve, changes the delivering necessary valve group, the ripple base pin valve, the oil field special-purpose needle valve, the oil field sample uses the needle valve, the measuring appliance fitting, beautiful sign needle valve and so on.
2、This factory production measuring appliance valve installment disassemblage way has the butt welding type, form and so on card model, thread and flange connection, has the installment disassemblage conveniently, leak-proof quality good, is thermostable, merit and so on high pressure.
3、This factory production needle valve, selection fine, manufacture precise, the material passes through before the processing the physical performance and chemistry performance test, the closure Joint form uses the valve lever, the valve petal rollings becomes, the valve petal needle is not easy to wear, the leak-proof quality strong, the closure is sturdy. After Joint the surface heat treatment degree of hardness is higher, the related engineering factor conforms to the national correlation standard, the service life uniform surpasses the domestic similar product.
4、Regarding high temperature, high-pressured measuring appliance valve sealing compound this factory uses the new material flexible graphite, this material seal, thermostable, bears the high pressure, anti-corrosive and so on the performance is better.
5、Before the installment should carefully inspect the service condition whether with the product label, the certificate stipulated the performance tallies.
6、Installs when should cause the medium flowing to the sign note arrow direction to be consistent with the valve body on.
7、Related quick-wear part this factory has the on-hand merchandise supply.
8、Widely applies to the steam power plant and the chemical industry, the light industry, the petroleum uniform flux passes on the pipeline and on the thermal meter pipeline.
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