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MadMango, Thanks for your reply! We tried the linkages available through McMaster-Carr initially. They have substantial end play (due to the ball being retained by an internal spring clip, not swaged) that is not acceptable in our application. Star for you for responding quickly.

I apologize in advance for posting a blatantly off-topic request for help here, but I'm at a loss for where else to go. We bought some samples quantities of this in-line, male-male ball joint. http://midwestcontrol.com/photos/large/190.jpg Now that we have proven the product, we issued the...

Hopefully the collective wisdom here can advise me on this topic. While the hydrostatic proof test of control valves is well defined (e.g. ANSI/ISA-75.19) I have not been able to find a corresponding standard for burst testing. My research shows an "industry standard" of minimum 4-7 times...

I have reviewed several manufacturer's documentation with regards to forged brass ball valves, and have a question regarding the specification of "Body Pressure" or "Working Pressure". I am used to the hydrostatic testing requirements of ASME B16.34 and ANSI/ISA-75.19.01 which both state a...

I am looking to brush up on my Fluid Mechanics training and specifically focus on valve engineering theory. I have looked at a few colleges in the area with the thought of auditing a course, but if they offer Fluid Mechanics at all, the focus seems to be in the aeronautical direction. Maybe...

TD2K, Is that to say that I just need to convert the units of my water-based Cv to the flow units I want for CO2? Basically GPM to CFM?

If I have a valve with a known Cv for fluids (water specifically), is there a correlation that can be made to the Cv for gases (specifically CO2)?

Kaplin, Belimo (www.belimo.com) has spring return electrical actuators on ball valves up to 2". Spring Return time is < 60 sec. and with MFT programming the opening time can be 75 sec.

Thanks for the replies. I also looked at the O-rings and if anything there appears to be some compression set. I don't think they caused the torque increase. We are running close to the high end of the temp range of the grease (200°F -> rated @ 212°F). Could this cause such accelerated...

I posted this in the Valve Engineering forum, but thought there might be insight from this forum as well. Any ideas? I have some ball valves in my system that have started to exhibit higher torque requirements to actuate. I took a couple apart to see what was going on, and noticed that the...

I posted this in the Valve Engineering forum, but thought there might be insight here as well from the side of the water treatment. I have some ball valves in my system that have started to exhibit higher torque requirements to actuate. I took a couple apart to see what was going on, and...

I have some ball valves in my system that have started to exhibit higher torque requirements to actuate. I took a couple apart to see what was going on, and noticed that the stem and O-rings seemed rather "dry". The grease appeared to lose all it's lubricating qualities, although it was...