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4

Valves On Low Pressure Steam Service


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#1 Ali4269278331

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Posted 15 April 2024 - 02:27 PM

hi

i have a low pressure steam service as saturated that genrated of fire tube boiler. the steam temp. and pressure are 180oC and 8bar respectively. i want use of ball valve with charactrization that attached. which is Valve Item is good case for my design?

 

thanks

 

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#2 Pilesar

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Posted 15 April 2024 - 06:40 PM

Why do you want to use a ball valve? I suggest contacting your valve vendor for their recommendation.



#3 breizh

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Posted 15 April 2024 - 07:44 PM

Hi, 

Agree with Pilesar. Please explain your choice. Cost cannot be the driver.

Breizh

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#4 Ali4269278331

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Posted 18 April 2024 - 12:04 PM

Why do you want to use a ball valve? I suggest contacting your valve vendor for their recommendation.

 

we have valve specification document that prepared by project designer and he select a ball valves for low pressure steam service.



#5 shvet1

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Posted 18 April 2024 - 11:17 PM

What does PTF2 / VIT / NIT stand for?


Edited by shvet1, 18 April 2024 - 11:30 PM.


#6 breizh

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Posted 19 April 2024 - 05:12 AM

Hi shvet1,

PTFE,Viton,Nitrile.

 

Ali,

Why ball valve ?  for isolation or for throttling or.....

https://qrcvalves.co...t-applications/

 

Breizh



#7 shvet1

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Posted 19 April 2024 - 05:24 AM

@breizh

PTFE - seems no as there is PTFE and PTF2 in the table

 

@Ali

Are you asking about the item 511 AG 2C7?



#8 Ali4269278331

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Posted 20 April 2024 - 12:31 PM

Hi shvet1,

PTFE,Viton,Nitrile.

 

Ali,

Why ball valve ?  for isolation or for throttling or.....

https://qrcvalves.co...t-applications/

 

Breizh

 

The project designer consider for isolating the steam service. but if want to isloate the line, the ball valve had leakage too much. finally, i decide to change with gate valve if possible.



#9 Ali4269278331

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Posted 20 April 2024 - 12:36 PM

@breizh

PTFE - seems no as there is PTFE and PTF2 in the table

 

@Ali

Are you asking about the item 511 AG 2C7?

 

the 511 AG 2C7 item code isnot suitable, Now i consultant with valve shop, he said i can change the PTFE that work in 300oC but i think fail the seal ring after 3month in service.



#10 breizh

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Posted 20 April 2024 - 07:07 PM

HI,

PTF2 material : 

https://store.csides...0-256--PTF2-000

Yes, Gate valve is a better option.

Breizh



#11 shvet1

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Posted 22 April 2024 - 12:30 AM

HI,

PTF2 material : 

https://store.csides...0-256--PTF2-000

Yes, Gate valve is a better option.

Breizh

 

Seems PTF2 is specific manucatrurer's article, not a material. While in the table above PTF2 is mentioned as a material.

 

 

 

the 511 AG 2C7 item code isnot suitable,  

 

 

Then which one item is suitable? ))) Why did you share this doc?

 

 

 

Now i consultant with valve shop, he said i can change the PTFE that work in 300oC but i think fail the seal ring after 3month in service.

 

 

As per my experience with PTFE the real temp limit for intermittent service of 95% PTFE availble on market is 180-220°C.

The rest 5% 240-260°C but the price is high and you shall rely on manufacturer/supplier reputation/references instead of specification.



#12 Ali4269278331

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Posted 24 April 2024 - 12:53 PM

 

HI,

PTF2 material : 

https://store.csides...0-256--PTF2-000

Yes, Gate valve is a better option.

Breizh

 

Seems PTF2 is specific manucatrurer's article, not a material. While in the table above PTF2 is mentioned as a material.

 

 

 

the 511 AG 2C7 item code isnot suitable,  

 

 

Then which one item is suitable? ))) Why did you share this doc?

 

 

 

Now i consultant with valve shop, he said i can change the PTFE that work in 300oC but i think fail the seal ring after 3month in service.

 

 

As per my experience with PTFE the real temp limit for intermittent service of 95% PTFE availble on market is 180-220°C.

The rest 5% 240-260°C but the price is high and you shall rely on manufacturer/supplier reputation/references instead of specification.

 

Thanks, perfect. i should be use of this way.

 






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