Globe Control Valve ID

[nabison]

I'm stumped. I can't find any standard or literature which dictates the ID of a globe control valve. I'm not referring to the port diameter, but rather the bore ID of the flow inlet or outlet. My specific valve in question is a Fisher HP CL1500 RTJ flanges, but I can't seem to find ID of the valve inlet/outlet. I have spent all day looking at ASME B16.5 (flanges), 16.34 (control valves), B36.10M (piping), as well as Fisher's control valve literature for Type E, EH, HP, etc. Why on earth would this number not be available...somewhere?!

B16.34 para 6.2.2 states that the flanged ends of a control valve are per ASME 16.5, however there is no specific mention of ID in this paragraph
B16.5 does not specify the ID of CL1500 fittings or valve flanges. Table 20 (and II-20) have ID's for slip on and lapped flanges, but for the actual wetted ID, it says determined by purchaser.

Question #1. If I were to manufacture globe control valves, with a wide variety of flanges, how would I determine the ID?
Question #2. If I were to purchase a globe control valve, and was particularly concerned with the ID from an application perspective, how would I find out this information (short of contacting fisher?

P.S. I worked as a design engineer at Fisher for 9 years and I STILL don't know the answer to this question!!

 

[LittleInch]

That's because there isn't one.

Why would there be - It's of no use to anyone.

Each valve is a cast / machined inside which is different and that's not a problem that needs solving by a standard fixing it.

Where would measure ID anyway in globe valve?

Q1 - why would you need to? Make it big enough to flow the fluid.
Q2 - Buy one and measure it. Or ask the vendor for a bit of information no one else wants to know.

All i want know from a Control valve is its connecting flanges and how long it is and whether it will control my flow. Everything else is irrelevant. IMHO.

 

[nabison]

A1 - because you want the port to be the controlling element, and if the inlet was 0.625 for a NPS 1 valve, that would hinder control. Or if it was 1.375 then you wouldn't have enough for the gasket to seat
A2 - see below. I wonder why they even put that information in the standard...silly ASME

I ended up finding the table I was looking for in Table E-4 in the Mandatory Appendices. I just walked into the office, opened up the standard and there it was on page 219.