Process condition for On/Off valve.
Process condition for On/Off valve.
(OP)
Hi,
I have a data sheet of a On/Off valve. The valve is intended to be operated for N2 gas.
The downstream of the valve get mixed with the process liquid.
But the data sheet contains process condition(fluid properties) for liquid instead of gas.
Both fluid process conditions are different at upstream and downstream of the valve.
Is data sheet containing wrong process data?
I really don't have any idea about this type of feature.
Would be very grateful for getting any help.
Many Thanks.
Shahidul
I have a data sheet of a On/Off valve. The valve is intended to be operated for N2 gas.
The downstream of the valve get mixed with the process liquid.
But the data sheet contains process condition(fluid properties) for liquid instead of gas.
Both fluid process conditions are different at upstream and downstream of the valve.
Is data sheet containing wrong process data?
I really don't have any idea about this type of feature.
Would be very grateful for getting any help.
Many Thanks.
Shahidul





RE: Process condition for On/Off valve.
RE: Process condition for On/Off valve.
You are right. The valve is yet to be purchased and it will contact with the downstream liquid.
Thanks.
RE: Process condition for On/Off valve.
Without knowing any additional information, it appears highly unlikely that the valve will be able to perform its intended function. Please post a sketch and valve parameters and we may be able to provide you with more specific answers.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Process condition for On/Off valve.
Thanks for your concern in this matter.
You are right about your concept.
I have added pdf file which contains 2 possible figures and the data sheet for V-2 valve sizing.
For figure-1, V-3 valve data sheet contains inlet N2 fluid properties for valve sizing.
The problem is associated with figure-2.
Many Thanks.
RE: Process condition for On/Off valve.
RE: Process condition for On/Off valve.
The On/Off valve is a part of the Nitrogen system - fluid service is Nitrogen and the valve body material matches with the piping class for Nitrogen service. Datasheet should reflect this information - fluid should be Nitrogen, not "process liquid".
Figure 2 is technically incorrect from the point of view of current design (if SS304/316 is susceptible to process fluid, it can be damaged). With the arrangement as in Figure 1, that possibility is significantly reduced (but not eliminated, due to common leakage of check valves).
Dejan IVANOVIC
Process Engineer, MSChE
RE: Process condition for On/Off valve.
The truth is that I have both arrangements in my design.
If SS304/316 is susceptible to process fluid, then should V-2 be sized for CS11 and process liquid despite being the part of N2 system?
Thanks.
RE: Process condition for On/Off valve.
Dejan IVANOVIC
Process Engineer, MSChE
RE: Process condition for On/Off valve.
RE: Process condition for On/Off valve.