Hi Vaibhav,
Looks like check valves are all of a sudden back in fashion.
With your current installation, how far down stream are the double door check valves from a major source of turbulence? See below.
Some years ago I came across a four pump, pumping station that had Enviro check valves installed almost immediately down stream of a pressure sustaining valve. This style of check valve does not have any external drillings for the fitting of the door hinge pins, the pins and the doors merely clip-in within the valve body itself. The reasoning behind this style of valve is that if you do not have any drillings externally you cannot get any leaks.
The turbulence was that bad at the check valve that within a three month period the guts of the valve had shaken itself loose and the doors, hinge pins, return springs and washers had all disappeared down the pipe work never to be seen again. Hence, my question to you in relation to the position of your valve installation.
I hope this may help.
Cheers,
Robin
>
>
>
>
>
> Though the question looks very simple but the answer is required because
we
> are facing lots of problem in the existing valves. We have installed Dual
> plate valves in the pump discharge line vertically which is the general
> practice. But the valves are not serving satisfactorily. It was installed
> before five years back and now we are observing some leak which is causing
> us a headache at the time of the scheduled maintenance of the pump. There
> has been long discussions with vendors but we are not completely satisfied
> with their replies.
>
> Through this forum I intended to know the general installation practices
> followed elsewhere and hence I have asked this straight question . Also
it
> is known that very elementary questions do not have simplified answers
and
> this site is created not only for experts but to give maximum benefit to
> the avid learners if not beginners.
>
> If you look at some of my queries in the past e.g. a so called more
> complex question - one regarding constant spring hanger operating under
> occasional load and vibrating structure , I received not even a single
clue
> from the site.
>
> The company where I work does not require any introduction. So let us
work
> in the best interests of the engineering fraternity which are at hard
times
> now and finding survival difficult. We solicit worthwhile , good counsel,
> advice and tips ,snippets of wisdom from the experts, and not so experts.
> This will go a long way in scripting a success story for the group which
> till day has done a fine job.
>
> Regards
> Vaibhav Devdhar
>
>
>
>
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Received on Mon Nov 01 20:05:00 2004
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