Re: Metal Seated Butterfly Valves

efor water lines you dont requiere metal seated butterfly valve pn 20 ptfe seat is ok
-----Original Message-----
From: bhanu kiran <vtbk@yahoo.com> To: pipingdesign@yahoogroups.com <pipingdesign@yahoogroups.com> Date: Tuesday, May 15, 2001 9:54 PM
Subject: [PipingDesign] Metal Seated Butterfly Valves

>We want to procure metal seated butterfly valves for
>our water lines.
>
>The seat leakage test pressure is 17.6 Kg/cm2.
>
>The working pressures in the water line range from
>10 kg/cm2 to 16 kg/cm2.
>
>All the valve manufacturers have said that if we
>procure a metal seated BFV with a seat test pressure
>of 17.6 kg/cm2, the valve will work at 17.6 kg/cm2 but
>will leak at 10 kg/cm2. Therefore the valves would be
>leaking at working pressures, as 10 kg/cm2 to
>16 kg/cm2 is our working pressure.
>
>Is the argument right that metal seated BFV designed
>for a particular seat test pressure will leak at all
>lower pressures.
>
>Please clarify on this argument.
>
>Are there any codes which prohibit testing of seat
>leakages at lower pressures, other than the seat test
>pressure.
>
>When we are pressurising a valve for seat leak test,
>is it ok if the valve leaks at lower pressures.
>
>I would be glad for a early reply.
>
>Bhanu
>
>
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! Auctions - buy the things you want at great prices
><a href="http://auctions.yahoo.com/">http://auctions.yahoo.com/</a>
>
>
>_____________________
>Piping Design Central
>[ http://www.PipingDesign.com ]
>________________________________________
>We hope you find this newsletter useful.
>If not, you can unsubscribe at:
><a href="/group/PipingDesign/post?postID=0uLNj3e-kujYYvCnRWN4FTxeoWxcS0vASyEwYG02uEYso6-XvGdadAQBHw-9QSMKFb5ArerejR2nmdmtQNv76Rpqobegg0LDq9VmTyyBY-VC">PipingDesign-unsubscribe@yahoogroups.com</a>
>Post message: <a href="/group/PipingDesign/post?postID=F8Dnp2YbCNRaPHhuHKxFsHd5Y5U-T5B2z0ZjPdtDBKdxhN8n3qBQvDQLyPZU1uUoY-6Tgs7168tNshJKJn92Ji1kbNhA">PipingDesign@yahoogroups.com</a>
>Subscribe: <a href="/group/PipingDesign/post?postID=FV1x6kVez1rmdfyeOHPPactfsIaJRI4b7oQoYHrcX_YSjmX-38xE6gLkvbFXUeE9YfA-AGjP2TkE_P0KrGkMlwJmFqsUzUtHKOVOD1xB8XNi">PipingDesign-subscribe@yahoogroups.com</a>
>
>Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a>
>
>
Received on Tue May 16 12:57:00 2000