What standards should be referred to to determine the pressure that threaded-valve connections can withstand?
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I’m wondering about valves with threads of 1/4NPT, 1/2NPT, G1/2, RC1/4 (external or internal threads), or those with sleeve connections; for such valves, the valve body strength is usually 3000psi or 6000psi. For different thread types, which standard can be referred to in order to find relevant information?
These are all size standards for British and American specifications, as well as the ASME standards: the ASME B16 series of standards – this series covers various aspects of valves, including overall length, flanges and flanged fittings, butt-welded ends, valve dimensions, etc. Although the focus is primarily on flange and butt weld connections, some of these standards contain general information or principles related to threaded connections. ASME B16.10: Face-to-face and end-to-end dimensions of valves. ASME B16.11: Forged, welded, and threaded socket fittings. This standard is more directly related to threaded valves, as it involves threaded socket fittings. ASME B6.34 (and possible amendments): Valves – Flanges, Threads, and Welded Ends. This standard directly relates to the design and requirements of threaded valves.
The standards commonly referenced for determining the pressure that valves with threaded connections can withstand include the American Petroleum Institute (API) standards, the American Society of Mechanical Engineers (ASME) standards, and the International Organization for Standardization (ISO) standards. Specifically regarding the thread type you mentioned: 1. NPT (American **pipe thread): Refer to the ASME B1.20.1 standard. 2. G thread (straight pipe thread): Refer to ISO 228 standard. 3. RC thread (British pipe thread, identical to BSPT): Refer to ISO 7/1 or BS 21 standards. As for valves with cartridge connections, the manufacturer’s product specifications and installation manuals are generally used as a reference; top-quality valves usually comply with relevant testing and pressure standards set by ASME or API. When selecting valves, you need to ensure that they can handle the maximum operating pressure required in your system; at the same time, you must also take into account factors such as temperature and the type of medium, so as to guarantee that the valves can operate reliably under specific conditions. It is recommended to consult a professional or contact the valve manufacturer for more accurate information. .