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This document summarizes specifications for bolted bonnet steel gate valves. It outlines pressure and temperature ratings, requirements for valve stems, minimum body and bonnet thicknesses, special considerations for butt-welding end valves such as gradual transitions and minimum thickness requirements, bonnet neck specifications, and mandatory testing including shell pressure testing at 1.5 times the rated pressure and tests for closure tightness and stem backseating with no allowed leakage.

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ananyo_sengupta
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328 views4 pages

API600

This document summarizes specifications for bolted bonnet steel gate valves. It outlines pressure and temperature ratings, requirements for valve stems, minimum body and bonnet thicknesses, special considerations for butt-welding end valves such as gradual transitions and minimum thickness requirements, bonnet neck specifications, and mandatory testing including shell pressure testing at 1.5 times the rated pressure and tests for closure tightness and stem backseating with no allowed leakage.

Uploaded by

ananyo_sengupta
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Bolted Bonnet Steel Gate Valves

Pressure temperature rating as per B 16.34.

Valve Stems: Rising Stem with Outside Screw and Yoke Rising Stem with Inside Screw NonRising Stem with Inside Screw Ananyo Sengupta 17-07-2013 12:57

Body and Bonnet Minimum Thickness:

Ananyo Sengupta

17-07-2013 12:57

Special Considerations for BW valves: 1. The weld end preparation in butt-welding end valves shall not reduce the body wall thickness to less than the values specified above within a region closer to the outside surface of the body neck than tm measured along the run direction. 2. The transition to the weld preparation shall be gradual and the section shall be essentially circular through the entire length of the transition. 3. Sharp discontinuities or abrupt changes in section in areas that infringe into the transition shall be avoided, except for test collars or bands, either welded or integral. 4. In no case shall the thickness be less than 0,77 tm at a distance of 1,33 tm from the weld end.

Bonnet Neck (Packing Entry Way):

Ananyo Sengupta

17-07-2013 12:57

Testing: Mandatory tests for each valve: Shell Test: 1. shell pressure test Minimum 1.5 times the 2. a closure tightness test pressure corresponding to 3. a stem backseat test Ananyo Sengupta the valve 38C pressure rating. The packing gland shall be adjusted so as to

Minimum Duration: DN50 15s 17-07-2013 12:57 65DN150 60s 200DN300 120s 350DN 300s No Leakage through shell

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