RE: Re: Arc Valve

From: <Gang>
Date: Fri Nov 15 2002 - 00:38:00 EST

Dear Ravi,
These vaves are meant for dissipating the heat of friction generated by the churning of the liquid inside the pump between the impeller and the casing in the shut off conditions, when there is no demand of the product in the system. These are very expensive. The manufactures recommend the installation. Generally, it is best kept in the horizontal run. (better not on the vertical discharge nozzle, as it is very heavy, it can impart a lot of load on the pump nozzle). The prefferred installation has to be well understood by the vendor. Generally the return is fed to the suction vessel. A location proximate to the vessel will be desirable.
Good luck!!!
C. V. Gangadharan
--- "Arora, Ravi" <rarora@bechtel.com> wrote:
> Does ARC Valve has to be placed directly on nozzle
> or what are the
> requirments to place it?
>
> Thanks
> Ravi
>
>
> > -----Original Message-----
> > From: mechengr1977 [SMTP:mechengr1977@yahoo.com]
> > Sent: Friday, November 15, 2002 8:56 AM
> > To: PipingDesign@yahoogroups.com
> > Subject: [PipingDesign] Re: Arc Valve
> >
> > in case the budget is tight, the auto recirc valve
> can be replaced
> > with a combination of control valve and kick back
> line. sure it
> > require more piping but its simpler to operate and
> maintain. the
> > Yarway will require setting up some spare parts
> and an occaisonal
> > call from their rep to help you out with the
> overhaul.
> >
> >
> > --- In PipingDesign@y..., "Rothert, Rainer"
> <Rainer.Rothert@k...>
> > wrote:
> > > Hi Ravi,
> > >
> > > An arc valve is an "Automatic Recirculation
> Control Valve" and it
> > protect pumps from the dangers of low and/or
> reverse flow.
> > >
> > > See:
> > > http://www.yarway.com/control_valves.asp
> > > http://www.schroedahl.de/index_com.html
> > > http://www.hora.de/english/pages/pumpen/home.htm
> > >
> > > Regards
> > > Rainer
> > >
> > >
> > > -----Ursprüngliche Nachricht-----
> > > Von: Arora, Ravi [mailto:rarora@b...]
> > > Gesendet am: Donnerstag, 14. November 2002 11:08
> > > An: 'PipingDesign@y...'
> > > Betreff: [PipingDesign] Arc Valve
> > >
> > > All,
> > >
> > > Can anybody brief me ....What is arc valve and
> where we use it??
> > >
> > > Thanks
> > > Ravi
> >
> >
> > Discussion List sponsor: Texas Flange - a good
> source for information on
> > industrial flanges, all they ask is for referrals
> for designs they help
> > with.
> > 877-610-8924.
> > www.texasflange.com
> >
>

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