11 replies to this topic

[Ali4269278331]

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

 

Attached Files

•  88.pdf   97.06KB   23 downloads

[Pilesar]

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

[breizh]

Hi, 

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

Breizh

Attached Files

•  valves fundamentals.pdf   1.31MB   15 downloads

[Ali4269278331]

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.

[shvet1]

What does PTF2 / VIT / NIT stand for?

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

[breizh]

Hi shvet1,

PTFE,Viton,Nitrile.

 

Ali,

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

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

 

Breizh

[shvet1]

@breizh

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

 

@Ali

Are you asking about the item 511 AG 2C7?

[Ali4269278331]

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.

[Ali4269278331]

@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.

[breizh]

HI,

PTF2 material : 

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

Yes, Gate valve is a better option.

Breizh

[shvet1]

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.

[Ali4269278331]

 

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.