Bronze Stem Nut

[Peter Lupien]

Hello,

I am a machinist who works in a company that services valves. Sometimes I have to manufacture replacement stem nuts. What should be the maximum temperature that a bronze stem nut is used on? I am thinking the heat must dissipate a lot by the time it gets to the top of a bonnet and yoke structure, but I would like an idea of a safety rule.

Thank You,

Pete Lupien

 

[MJCronin]

Pete:

Pressure-temperature ratings are set for the entire bronze valve based on materials selected, valve end conditions and other factors.

There are national standards that set these values and dimensional requirements.

http://www.turnkeyips.com/assets/pressure_temperature_ratings_for_bronze_gate.pdf

There are not pressure-temperature ratings for specific sub-components such as valve stems.



MJCronin
Sr. Process Engineer

 

[Isha90]

Hi,Could you share Valve type, Body material, is it hand wheel or actuator operated valve,

 

[Peter Lupien]

Hi Isha90,

Thanks for looking. This is a:

Globe valve
8 inch
300 pond class
850 max temp
WCB body
CR13 Stem 1 1/2 - 4 single start acme
Hand wheel operated
Carbon steel stem nut.

THe stem and stem nut threads are both very worn from use, and the customer wants to replace parts rather than the whole valve. We can do that, I'd like to give him a better setup than what he has if it is cost effective and more durable.

 

[Isha90]

Stem Nut material can be A439 GR.D2 / ASTM B148