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Hey! Greetings! I was going through catalogues of floating ball valve manufacturers and found a confusing thing that most of the manufacturers were offering floating 3-piece ball valve in smaller sizes (2" and less) in higher pressure class (800 and 900) but in bigger sizes (21/2", 3" and 4")...

Thanks @bcd that statement clears many doubts in mind and makes work easy for me. Kudos!

Thanks for the input but is that exact depth 'h1' important in the actuator mounting flange? I'm stuck with the designing of the actuator mounting flange because I can't see the importance of that exact depth. Hope someone can clear this doubt. Thanks!

Hey Greetings! I was studying ISO 5211:2001 "Industrial valves - Part-turn actuator attachment" standard and I am thinking how much importance dimension 'h1' holds in recent valve market? Is it necessary to provide that much of depth on valve top mounting pad because most of the actuators I have...

So basically both valves can be said the best if they serve the purpose of leakage proof line and being smooth or tight while operation varies from manufacturer to manufacturer. P.S. @Danlap valve is soft seated one and not metal seated. Sorry not to mention that before.

Sorry for less information but yeah here the details of both the ball valves I have: Floating type - 3 piece ball valve - class 800 - socket welded - DN 25 - Hand Lever operated - bi-directional - no lubrication So your views remain the same? Thanks!

hey Greetings! I am a bit confused here. I have bought 2 three-piece ball valves with same pressure class and same features but different manufacturers. One is smooth to operate while other requires more efforts to operate it in same line. Why is that happening? Two reasons I can think of: 1...

oh thanks @drexl Can you provide a picture of the table representing the minimum diameter for full bore? Thanks in advance.

@danlap thanks and I do ask the manufacturers first but yeah I got your point. @jmec87 thanks for making things more clear.

hey I read this information on internet that when a valve is said fire safe it means the design is fire safe and it is not fire tested while if it is said by the manufacturer that valve is fire tested then only it has been 100% fire tested. So my doubt is while the maunfacturer writes in catalog...

Thanks. Sums up many things for me.

Hello Can anyone suggest me any standards which are used in valve industry to do incoming material inspection for the ball valve bought outs? For example, our bought outs include everything except valve body so we are confused which inspection standard we should choose in order to provide best...

Hey I got a question. I can't understand why my supplier is giving me a bit different bore when I ordered a full bore ball valve design? I got a bore of 11.6 mm in a 1/4"(DN8) full bore ball valve, 12.5 mm in a 3/8"(DN10) full bore ball valve and 24 mm in a 1"(DN25) full bore ball valve. And in...

Hey I went through the standard and I got confused if designer picks the method and takes a min. value for thickness then won't there be a problem for interchangeability of central core made by other manufacturers? For example; If I want to change just the central core of my multi-piece ball...

Thanks to make things clear in my head. :)

I read some of the information which related to wafer type butterfly valve on online website.They provided following things on their website: A wafer butterfly valve's function is to retain a seal to protect against dual-directional pressure differential in the flow of fluid. In other words, the...

Hey Greetings! I'm in a confusion regarding something I read on internet. Can anyone explain me how a wafer type butterfly valve safeguards against bi-directional pressure differential to avoid any back flow in systems that have been manufactured for uni-directional flow? I mean I know wafer...

Okay the response from @bcd is amazing and thanks for providing me the link to that @danlap :) Now I guess I'm much more clear with the concept of keeping the same ball. (P.S. Forum is great to learn new things everyday with this many experts to teach you)

Hey Greetings! I got a 1" reduced bore and 1" full bore 3-piece ball valve. Now if I just concentrate on middle main body piece of both the valves the difference I observed was due the size of the ball (obviously due to difference in bore). Now my question is if the ball outer diameter is kept...

okay I got it! I will check the valve accordingly at 198 bar for shell test and 1.1 times the maximum pressure for hydrostatic seat leakage test. Thanks for the help and you are really a true expert @LittleInch :)