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Pneumatic Control Valves
Filters 1,545 Results
$132.77
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$62.27
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$20.01
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$40.08
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$38.92
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$117.40
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$99.81
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$527.43
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$698.12
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$898.99
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$520.38
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$520.38
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$438.42
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$609.39
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$709.34
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$604.71
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$604.71
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$686.67
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$686.67
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$686.67
Subject to factory lead times
$686.67
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$595.78
Subject to factory lead times
$132.77
Subject to factory lead times
Subject to factory lead times
$62.27
Subject to factory lead times
Subject to factory lead times
$20.01
Subject to factory lead times
$40.08
Subject to factory lead times
$38.92
Subject to factory lead times
$117.40
Subject to factory lead times
$99.81
Subject to factory lead times
$527.43
Subject to factory lead times
$698.12
Subject to factory lead times
$898.99
Subject to factory lead times
$520.38
Subject to factory lead times
$520.38
Subject to factory lead times
$438.42
Subject to factory lead times
$609.39
Subject to factory lead times
$709.34
Subject to factory lead times
$604.71
Subject to factory lead times
$604.71
Subject to factory lead times
$686.67
Subject to factory lead times
$686.67
Subject to factory lead times
$686.67
Subject to factory lead times
$686.67
Subject to factory lead times
$595.78
Subject to factory lead times
- A pneumatic control valve is just a control valve operated by an air-powered actuator, usually a diaphragm. They're the dominant style in process plants because they're simple, reliable, and fail to a known position when you lose instrument air. Safety note: pneumatic control valves on hazardous service should have a documented fail-safe direction (air-to-open or air-to-close) determined during the process hazard analysis.
- Air-to-open means the valve opens when supplied with air pressure and closes by spring when air is lost. Air-to-close is the opposite. The choice is driven by what's safe if instrument air fails. On a steam line into a heat exchanger, you usually want air-to-open (fail closed). On a cooling water line, you want air-to-close (fail open).
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About NISCO Inc.
NISCO offers a wide range of pressure gauges & instruments, diaphragm seals, thermometers, valves, and flow control products to the industrial and commercial marketplaces, as well as other resellers like ourselves. We can also provide other value-added services such as gauge repair, NIST traceable calibration, diaphragm seal assembly, and valve automation. NISCO takes pride in providing extensive product knowledge, helpful customer service, and market competitive pricing to help fit whatever need you may have because it is our goal to be regarded by our customers as the best supplier of pressure, temperature, and flow control products.