Valve material and valve standards-(4)-fastener material
Fastener materials: Fasteners mainly include bolts, studs and nuts. The fastener directly bears the pressure on the
bolts and nuts for butterfly valve
valve, which plays a key role in preventing the outflow of the medium. Therefore, the selected material must ensure sufficient strength and impact toughness at the operating temperature.
When selecting fastener materials according to medium pressure and temperature, the following table can be selected:
| Name | Pn(Mpa) | medium temp /°C | |||||
| 300 | 350 | 400 | 425 | 450 | 530 | ||
| bolt Stud bolt |
1.6-2.5 | Q235(A3) | 35 | 30CrMoA | – | ||
| 4.0-10.0 | 35 | 35CrMoA | 25Cr2MoVA | ||||
| 16.0-20.0 | 30CrMoA | 35CrMoA | 25Cr2MoVA | ||||
| nut | 1.6-2.5 | Q235(A3) | 30 | 35 | |||
| 4.0-10.0 | 30 | 35 | 35CrMoA | ||||
| 16.0-20.0 | 35 | 35CrMoA | |||||
Heat treatment must be carried out when selecting alloy steel materials. When there are special corrosion resistance requirements for fasteners, stainless acid-resistant steels such as Cr17Ni2, 2Cr13, 1Cr18Ni9 can be selected.
TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN1200, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D
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Valve selection basis and selection guide;
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