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Re: NNG: Safety Valve Question; Why are there two different types?

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rehunn

April 10, 2017 12:48PM

Registered: 16 years ago
Posts: 4,894

One of the issues is that Kunkle uses both bronze and iron seats. The bronze seats would seal well in a steam application but over a period of time the
seats would erode (wire draw) and the valves would no longer seal. The valves we built for the Navy were for 400 psi service and you couldn't put a big
enough spring in the things to close against the pressure. We did a two stage where steam pressure holds the main stage shut and a smaller spring
operated pilot stage allows the main section to open. We still had to use stellite seats to get the thing to live, steam isn't a very friendly medium to work with.

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Subject	Author	Posted
NNG: Safety Valve Question; Why are there two different types?	C&TS488fan	April 06, 2017 10:45AM
Re: NNG: Safety Valve Question; Why are there two different types?	Linn W. Moedinger	April 06, 2017 12:01PM
Re: NNG: Safety Valve Question; Why are there two different types?	C&TS488fan	April 07, 2017 04:10PM
Re: NNG: Safety Valve Question; Why are there two different types?	rehunn	April 07, 2017 05:16PM
Re: NNG: Safety Valve Question; Why are there two different types?	Linn W. Moedinger	April 10, 2017 08:30AM
Re: NNG: Safety Valve Question; Why are there two different types?	Earl	April 10, 2017 10:07AM
Re: NNG: Safety Valve Question; Why are there two different types?	rehunn	April 10, 2017 12:48PM
Re: NNG: Safety Valve Question; Why are there two different types?	Earl	April 07, 2017 11:57PM
Re: NNG: Safety Valve Question; Why are there two different types?	rehunn	April 08, 2017 11:29AM
Re: NNG: Safety Valve Question; Why are there two different types?	C&TS488fan	April 10, 2017 09:43PM
Re: NNG: Safety Valve Question; Why are there two different types?	rehunn	April 11, 2017 11:27AM
Re: NNG: Safety Valve Question; Why are there two different types?	J.B.Bane	April 10, 2017 09:45PM

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488 stops for water at Los Pinos tank on closing day Oct. 1979. Photo courtesy Don Richter

The NGDF was started by Don Richter and is currently operated in his memory by Nathan Holmes and others. Others who have contributed to the upkeep of this board are (in no particular order): Charles McCandless, Everett Lueck, Ted Wilton, Cole Adams, James Bane, John Moellmer, Jon Bentz, Linn Moedinger, lloyd lehrer, Rod Jensen, John Craft, Steven Forney, Herb Kelsey, Bill Ramaley, Russ Sperry (El Russo Loco), Josh McNeal, John West, Jim Armstrong, Bob Bergstrom, Greg Scholl, Blake Forbes Doug van Veelen and Mark Fuller.