Fisher Control Valve Sizing Software Firstvue Download Firefox
Hi cliff6361,I am not quite sure how you are going to use 'this control valve sizing program', or if I understand quite what you mean by 'valve sizing program'. However, here are some thoughts:Each valve that you chose will have a Cv number that you need to get from the manufacture.
Fisher, for example, in their FirstVue sizeing program includes this, and you are then able to match your Cv requirement to the valve's Cv. I would think that other vendors's sizing program does the same. This would mean that if you plan to buy a Fisher valve, you most likely would want to use their sizing program, and the same for each other valve manufacturer.On the other hand, if you mean a 'valve sizing program' to determine what the required Cv of the valve would need to be, then that is a different type of program. That is almost into the realm of a process simulator/modelling progarm.
Fisher Control Valve Sizing Handbook
In this case, you are looking at flowrates, upstream/downstream pressures, including pumping curves etc. To determine the max/norm/min flow conditions to determine the range of Cv for the valve. If this is the case, there are vendors such as Aspen/Hyprotech that sell packages that may meet your needs.Hope this helps.RE: Valve sizing programs. In order to specify a control valve a program such as AFTs Fathom can be used. Especially if you use their goal seeking and extended time simulation modules.
Then you will be able to specify to the control valve vendor what the process conditions are to be met. The best use of vendors software is to check the salesmens figures. Some are better than others.In my experience it has been preferable to establish a relationship with a control valve company so that you can trust them. Even then check their interpretation of your figures. They can make mistakes as well. If you have a relationship then even their mistakes can be forgiven.You cant expect the control valve company to be responsible for your process nor they expect you to be responsible for their product.
Its the grey area in between that both parties need to be adequately informed. Dot be tempted to save a few bob and leave all to the salesmen.RE: Valve sizing programs. The Fisher valve handbook has got their valve sizing equations in it and I just made up a spreadsheet for myself to use including the effect of cavitation on valve sizing.It's not nearly as powerful as the vendor's program of course but it's more than adequate when I want to estimate the Cv required and what size valve I'm likely talking about. It was enough to caught a mistake when our instrument engineer was sizing a control valve based on my min/normal/max conditions and I did a quick check of the Cvs and they weren't even close.
Turned out somehow he had mixed up the outlet pressure for the cases and used them in one calculation while showing them in the 'correct' column(s) on the data sheet. I'm not quite sure how he did that but he didn't believe me until I got him to use his program and the conditions for a given case and lo, the calculated Cv didn't match the data sheet's condition but matched my spreadsheet value. RE: Valve sizing programs (Mechanical) 29 Nov 05 00:45. Many years ago EPRI did a study on why large diameter butterfly valves were cavitating in large supercritical power plant even though the equations indicated they shouldn't be cavitating. They found that the equation was based on the flow to square root of delta P curve of a globe valve. Choked flow occured at 2% above the point of incipient cavitation.Hydrodynamic noise testing found that ball and butterfly valves would exhibit incipient cavitation way before choked flow occured.Metso Automation's 'Nelprof' sizing program calculates the 'Terminal Pressure Drop' per the equation but in addition provdes the noise calculations with limits to indicate when the valve may in fact be in moderate cavitaion.Futhermore I believe it to be the only program around that given accurate process data will provide both the 'inherent' and 'installed' characteristic.
Fisher Valve Specification Manager Tutorial
This is very helpful in optimizing loop tuning.It is frustrating to learn and use some days but has been extremely reliable in my work through the years. RE: Valve sizing programs (Mechanical) 1 Dec 05 22:15. Fisher FirstVue is a good. Similarly, Performance 9.?
(I forget the latest revision) is very good. Be careful utilizing noise figures predicted by the sizing programs. Many utilize 'in house' formulas/factors/voodoo to generate noise figures. The last program I wrote utilizes the ISA algorithm and is consistent with the IEC guidelines (unless I've really missed something) for aerodynamic noise prediction. Unfortunately, ours is written around our products; and is only setup to handle HC liquid/water/HC gas so I doubt it would be of help to you.don f.
RE: Valve sizing programs (Mechanical) 8 Dec 05 10:56. Ventomat air valves will be modelled in AFTs Impulse versin 4 to be released early next year. They can be modelled in Surge 2000, Hytran and Watham as we speak. I think DFLowmaster are behind the pack.That said if it air admission you seek to model then the full valve size can be modelled as the orifice size. Ventomat air valves restrict only the air discharge by use of multiple orifices.Air admission at maximum can only have the differential pressure between atmospheric and full vacuum. The program should determine if the air velocity is critical or not and apply the correct formula.