Netherlock always expects and replies only for big orders. If the order is more than Euro 1million, the founder of the company will reply you back. It is not a good approach though.
Anyway. coming to your email, the observation of your PID snap shows a FG/FS, possibly fuel gas with insulation/heat traced. But the No pocket note is strange there being a gas. So definetly we cannot bring the arrangement at floor level of the vessel. So operating the valve at such height without a platform, going to be a special task. However as the top nozzle of the vessel has a fig.8. and a manhole and I expect some arrangement to reach the top. And the change over valve being a raising stem, and the simultaneous operation is required of both the valves, chain-wheel is the best cheap solution. Have a look at the below snap of Netherlock where the long rod also is available to handle the key.
With regards,
Kannan
| "Bagesh Kumar" <bagesh.kmr@gmail.com> Sent by: piping_valves@yahoogroups.com 12/09/2008 13:51
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If you can throw some light for the interlocking between these Two Change over Valves , Although a vendor has suggested a chain interlocking, which is not looking suitable at this kind of application, I have tried to contact the Netherlock but didn’t recd any reply.
Thank u once again for your suggestion.
Kumar Bagesh
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