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Non return/check valves
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15 years 7 months ago - 15 years 7 months ago #7381 by newnesy
Non return/check valves was created by newnesy
I'm aware that NRV's are in the system to prevent any reverse flow but can anyone tell me what determines what side of the block valve that the NRV is placed ie is there a simple rule?
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15 years 7 months ago - 15 years 7 months ago #4766 by Jop
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Replied by Jop on topic The NRV performs the same
The NRV performs the same function as a Check valve. You should locate it in the same relationship to the block valve as you would a check valve.
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15 years 7 months ago - 15 years 7 months ago #4767 by newnesy
Replied by newnesy on topic yes, but what determines that
yes, but what determines that relationship?
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15 years 7 months ago - 15 years 7 months ago #4768 by Jop
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Replied by Jop on topic Ahh, sorry! In direction of flow
Ahh, sorry!
In direction of flow first the NRV (check valve) then the block valve.
In direction of flow first the NRV (check valve) then the block valve.
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15 years 7 months ago - 15 years 7 months ago #4772 by newnesy
Replied by newnesy on topic Thanks, that's cleared it up. The
Thanks, that's cleared it up.
The main reason I was asking is that I am running a new 6" line into an existing 14" gate valve attached to a tank nozzle. The p&id shows a ROSOV (remotely operated shut off valve) then the check valve, reducer and then the 14" gate valve. Why is the check valve not before the ROSOV? Is the ROSOV not classed as a block valve?
The main reason I was asking is that I am running a new 6" line into an existing 14" gate valve attached to a tank nozzle. The p&id shows a ROSOV (remotely operated shut off valve) then the check valve, reducer and then the 14" gate valve. Why is the check valve not before the ROSOV? Is the ROSOV not classed as a block valve?
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15 years 7 months ago - 15 years 7 months ago #4773 by Jop
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Replied by Jop on topic Your word description is not
Your word description is not clear to me.
Can you send me a simple sketch showing the tank nozzle, all the valves and the flow direction?
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or better yet, post it here so everyone can see it and get into the act.
Can you send me a simple sketch showing the tank nozzle, all the valves and the flow direction?
This email address is being protected from spambots. You need JavaScript enabled to view it.
or better yet, post it here so everyone can see it and get into the act.
Do it once and Do it Right
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