Reducing valves can work

I thought your recent article, “Pressure Regulators: Simplicity May Suffice,” ( CE , Oct. ’98, p.117), was great! I recommend this frequently in the field and a number of engineers look at me like I am a little “nutso.”

I have found most reducing valves have “swings” in pressure, and had to double up reducing valves to get really tight control. A line of steam traps, reducing valves, etc., called TLV, does away with the many problems I have

found when using many reducing valves as control valves (see www.tlv.com ). The cospect reducing valve has the characteristics of a quick opening valve, yet is linear. For batch operations where you can use an on/off valve, this valve has no peer. It opens wide open with an internal pilot, then holds pressure to within 1/2 psi. TLV makes the valve with an electric actuator, which can be connected directly to your inputs.

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