Questions regarding the nominal pressure of gate valves
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May I ask if there are any national standard valves of type Z41H-50? (Nominal pressure is 5.0 MPa). Also, are the nominal pressures of ordinary national standard valves limited to 1.6, 2.5, 4.0, and 6.4 MPa only? Are there any relevant standards that can be referred to?
I don’t see any gate valves with a nominal pressure of 5.0 MPa in the \"Practical Handbook of the Latest Valve Products,\" so I’m asking for your advice on this matter.
It might be non-standard, or it could be in accordance with the American standard of 300LB. If it’s 300LB, I’ve seen customers specify 50 instead; haha. As for national standards, I don’t think such a specification exists
Does that mean that the national standard does not specify 5.0 MPa?
The national standard does not specify 5.0 Mpa; this is either a non-standard specification or a US standard.
The US standard 300LB is equivalent to 5MPa
Personal opinion: The French standard GB/T9116.3 includes versions with a nominal pressure of PN5.0MPa; it’s likely that valves with this specification also exist!
This is a table from GB T 12234-2007 \"Steel gate valves with stud-connected valve covers for use in the petroleum and natural gas industry\" – is this what you were looking for?
Please refer to HG20592~20635-97 PN(Mpa) Class 2.0 150lb 5.0 300lb 11 600lb 15 900lb 26 1500lb 42 2500lb