Re: purpose of check valve

Hello.

The check valves that have a spring on to the closing element (disk), do close al zero flow, so they are call waterhammer anticipation valves, there are numerous manufacturers of this valves.

Example: Tyco Keystone type 810 check valve.

Arturo Murillo C.
Tuberías Visa de Culiacán S.A. de C.V.
Culiacán, Sin. México
Tel: ( 667 ) 717 1801

• Original Message ----- From: "Erik Scheir" <erik.scheir@pandora.be> To: <PipingDesign@yahoogroups.com> Sent: Wednesday, November 30, 2005 8:49 AM Subject: RE: [PipingDesign] purpose of check valve

> As far as I know there are no check valves who closes before flow reverse.
> An ideal check valve would close at zero flow (working like a diode).
>
> But ideal does no exist, so check valves always closes at return flow. The
> fast a check valve closes, the best it is with respect to waterhammer.
>
>
>
> If you know such check valves please let me know the type and the
> manufacturer.
>
>
>
> Erik.
>
>
>
> _____
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> Van: <a href="/group/PipingDesign/post?postID=nLudYsC5r7zCe1ChH3mmMABA74WAjNPa1syrWtYFUpj2yiFr912jNIRRc0bXGlOzqCMQ1kuGwfUXZC9TrQGR4GWzYLo">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=nLudYsC5r7zCe1ChH3mmMABA74WAjNPa1syrWtYFUpj2yiFr912jNIRRc0bXGlOzqCMQ1kuGwfUXZC9TrQGR4GWzYLo">PipingDesign@yahoogroups.com</a>]
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> Verzonden: Saturday, November 26, 2005 4:54 PM
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> Onderwerp: [PipingDesign] purpose of check valve
>
>
>
> Apart from back-flow prevention, there are other uses:
> 1) Spring loaded or 'silent' check valves assist in minimizing water
> hammer effects by the fast closure of the valve before flow reverses.
> 2) There are other specialized check valves used in steam extraction
> lines from turbines. These are power-assisted and prevent water from
> entering the turbine.
> R.V.Ramachandran
>
>
>
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Received on Wed Nov 30 13:06:00 2005