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Control valves in series for high pressure drop applications?

asked Mar 14, 2014 in E&I by RichS29 (4,320 points) | recategorized Mar 17, 2014 by odadmin
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answered Mar 14, 2014 by odadmin (21,030 points)
Theoretically dropping high pressure across two valves is better than single valve. However, in practice, two valves will not usually control well together unless the process can operate with a very low proportional band with slow response time.

A better alternative is to use a valve with internal multiple pressure drops. As an example, HUSHâ„¢ Trim manufacture such valves. This design reduces cavitation, excessive leakage, hazardous noise, vibration and mechanical failures.

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