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Dear CBlundell, If you need a pulse width modulating solenoid valve, Danfoss Industrial Controls Division in Baltimore (410-931-8250) has that type of valve. But then you mention pneumatic? That's a different animal. Confusing. Asco is probably the largest solenoid valve supplier in the USA...

Hello Digitrex, There are lots of portable air flow/velocity tools out there. A company called Dwyer Instruments carries a few models (www.dwyer-inst.com) of anemometer type devices that are easy to use and digital. KevinF

The Belimo PICCV is a combination of a "characterized" control 2-way ball valve (that Belimo has been selling successfully for about 5 years) and a differential pressure regulator. Belimo has not had success with this product, yet. The beta sites have failed (I've heard). The idea is a...

I believe ANSI Class IV leakage rating means less than .01% of the Cv. For your 40, that's .004 gpm.

For steam service, it depend on the pipe sizes, pressures and temperatures of your application. If you are talking about less than 100 psi steam and pipe sizes less than 2", then commercially available threaded globe valves (with stainless trim) are the most cost effective solution and will...

Valve seating/unseating torques can only be estimated by emperical methods per vendor and per design and per model number of a valve. Manufacturing tolerances and material variations are involved. These will be rough estimates at best and as soon as the valve sits un-stroked for a while or is...

Dear Tmpirrie, They are typically DC brushless motors with multi-step gear trains. Some have AC synchronous sub-motors with magnetic clutches. I suggest taking a look at the Electric Control Fundamentals chapter of Honeywell's Engineering Manual of Automatic Controls (the bible for HVAC...

Globe valves are called globe valves because of the global shape of the valve body casting. kevinf

Hello Waseem19, Butterfly valve opening area will differ depending on the type of disc construction and type of butterfly valve. Doubtful you will find an equation; check with manufacturers that make brand-name Centerline or Keystone (Tyco). Those flow curves for volume vs %opening are based on...

Dear Brucevaughan, First you need to put together 2 complete "controls" bill of materials so you know you're comparing an on/off control system to a modulating control system. Depending on your system, the thermostats (or controllers), valves, etc. will be different. You cannot simply...

You probably will not find a ball valve with an extended bonnet/yoke around the stem. If you are frequently operating a standard Conbraco (Apollo brand name) you will see early wear around the packing gland and get water leakage up through the stem. To stop the leakage you have to tighten the...

Need more information, what size valve are you in need of? Would a standard solenoid valve work for you? Not sure what you mean by low force..?

If you know the valve pipe size and the valve manufacturer you can probably get a retrofit actuator/linkage assembly, it depends on the valve construction. Try either Delta Control Products in Phoenix www.deltacp.com, or Belimo at www.belimo.com. Just let them know whether or not you need spring...

One of the best sources of information on control valves (all commercial controls actually) is the Honeywell Engineering Manual of Automatic Control, form number 77-1100. You can see the huge pdf file by searching for "engineering manual" on their web site...

A bubble-tight valve is one which has a soft seat (EPDM, teflon, etc.) and provides zero leakage shutoff. Standard "rubber" seated butterfly valves are considered bubble-tight. A bubble-tight valve is tested by putting the valve in the closed position and applying the rated...