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API valve/bonnet connection

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yld

Mechanical
Joined
Aug 11, 2003
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1
Location
CA
For API vavle, do we have to use studs and nuts to connect the bonnet (for actuator) to the valve? I am think about using socket head capscrews to connect them, will this violet some industry standards? I did not find anything metion about using bolts in API 6A, but in ASME B16.5, there are certain limitations to use bolts, ie. have to be hex head etc.

Thanks a lot.
 
I have seen the hex head bolts used on the smaller 2 1/16" 3K valves.However, I believe there are specs spelled out in API 6A as to what is acceptable for PSL1 to PSL4 valves.

hope that helped.
 
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