Design features and standards of flanged ball valves in different areas
Time: 2018-10-28 02:27:21 Source: Yonglong Valve Reading: zero second
Design features and standards of flanged ball valves in different areas
Ball valve is composed of valve body, ball core, valve stem, sealing ring and handle. Through the 90 ° angle switch of the handle, the ball core is an O-shaped ball with small fluid resistance, simple structure, small volume and light weight. It is widely used in the market. When the valve is fully opened or closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface.
Ball valve design features and design standards:
① ISO5211 platform connection, ② valve rod anti fly out design, ③ anti-static device,
④ The upper seal is functional, ⑤ fireproof structure design, ⑥ shell dewaxing precision casting
National standard ball valve design standard:
① Design and manufacture: GB/T 12237
② Flange connection: HG/T 20592, GB/T 9113
③ Structure length: GB/T 12221, ④ Wall thickness standard: GB/T-26640,
⑤ Inspection and test: GB/T 26480
Japanese standard ball valve design standard:
① Design and manufacture: API6D/608, ② Flange connection: JIS B2220
③ Structure length: ASME B16.10, ④ Wall thickness standard: ASME B16.34,
⑤ Inspection test: API598
American standard ball valve design standard:
① Design and manufacture: API 6D/608, ② Flange connection: ASME B16.5
③ Structure length: ASME B16.10, ④ Wall thickness standard: ASME B16.34,
⑤ Inspection and test: API 598
German standard ball valve design standard:
① Design and manufacture: DIN 3357, ② Flange connection: EN 1092-1
③ Structure length: DIN3202-F4, ④ wall thickness standard: ASME B16.34,
⑤ Inspection and test: API 598
Comparison Table of Class and Nominal Pressure
|
Class/LB American Standard |
Nominal pressure/MPa |
Bar/bar British standard |
|
seventy-five |
one |
ten |
|
one hundred and fifty |
two |
twenty |
|
three hundred |
five |
fifty |
|
four hundred |
six point seven |
sixty-seven |
|
six hundred |
10.0（11.0） |
one hundred |
Comparison Table of Japanese Class K, Class B and Metric Nominal Pressure
|
Class K |
ten |
twenty |
forty |
|
Pound scale |
one hundred and fifty |
three hundred |
six hundred |
|
Nominal pressure (MPa) |
two |
three |
ten |
| |
|
|
|
Valve pressure rating: bar conversion MPa
Bar is an English pressure unit
1MPa=145psi=10bar
1 bar=0.1 MPa=14.503 psi=1.0197 kg/cm2=0.987 atm
In engineering, it is commonly used as MPa: 1MPa=1000000Pa.
Characteristics of O-ball and V-ball of ball valve
Type O globe valve : The floating structure is adopted, the ball core is precision casting, and the outer surface is plated with hard chrome. The valve seat is made of reinforced polytetrafluoroethylene material, and the flow port is the same as the pipe diameter. The flow capacity is great, the flow resistance is very small, and there is no leakage when closing.
V-shaped ball valve: generally used for high viscosity, fiber containing and granular media, V-shaped ball valve is adopted, with V-shaped notch on the ball core, which can realize proportional adjustment, and the flow characteristic is approximately equal.
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