Number of turns in gear operated valves.
Number of turns in gear operated valves.
(OP)
Hello:
Is there any industry guidence for the maximum number of turns (from fully open to close position) allowed in case of gear operated valves.
In one of my previous project, vendor had offered valves with 750 turns (of course it was 80" valve).
Advice on this issue is higghly appreciated.
Cheers.
Kudroli
Is there any industry guidence for the maximum number of turns (from fully open to close position) allowed in case of gear operated valves.
In one of my previous project, vendor had offered valves with 750 turns (of course it was 80" valve).
Advice on this issue is higghly appreciated.
Cheers.
Kudroli





RE: Number of turns in gear operated valves.
RE: Number of turns in gear operated valves.
In addition to what Jim says: the necessary number of turns is then also of course influenced by the gear construction.
For larger valves a wormwheel construction, or wormwheel with linked arm, is often used to obtain the largest ratio of reduction with the least number of turns.
Have a look at the inner construction of the gear and check if the offered (supplied) type is the optimal gear construction for the valve.
RE: Number of turns in gear operated valves.
Thank you very much for the valuable knowledge shared.
Regards
kudroli
RE: Number of turns in gear operated valves.
In a small independant oil company, we considered the frequency of operation and decided that large valves in what we called maintenance isolations applications (and operated less than once a year)could be maintained as manual gearbox driven, but the gearbox would be fitted with an input drive nut for operation with an air gun.
RE: Number of turns in gear operated valves.