Masoneilan 7400 Series overview
Masoneilan 7400 Series Pneumatic Positioners The primary function of the Masoneilan 7400 Series valve positioners is to insure that the control valve plug posit...
Product details
Manufactured byMasoneilan
Product groupPneumatic Positioner
DescriptionMasoneilan 7400 Series Pneumatic Positioners
OverviewThe primary function of the Masoneilan 7400 Series valve positioners is to insure that the control valve plug position is always directly proportional to the value of the controller output pressure, regardless of packing box friction, diaphragm actuator hysteresis or off-balance forces on the valve plug. These positioners also provide a convenient and accurate means of changing the effective output signal range of a controller and/or changing the valve action. With modifications, a 7400 Series positioner may be converted into a pneumatic transmitter of valve stem travel or other motion (Model 1400).
Key Featuresresponsive to small pressure changes When complicated process lags necessitate the use of wide controller proportional band, the positioner provides an exact means of making the control valve responsive to very small changes in controller output pressure. remote valve location When air-operated control valves are located far from the control instrument, positioners will reduce lag, thus speeding up valve operation response. operates any standard or non-standard valve The positioner may be supplied to operate any valve, whether with standard, or non-standard springs, and for a number of signal ranges. bypass valve is standard With the bypass set at "Positioner", the controller signal pressure is carried directly to the bellows and the supply is brought to the pilot for normal operation. When set at "Bypass" the positioner air supply is dead-ended and the controller signal pressure goes directly to the control valve. Maintenance can be performed on the positioner withoutdisturbing the process. split range Some processes require the sequential operation of two or three control valves by a single controller with a 3-15 psi output signal range. Where this occurs, each positioner-equipped valve is operated through its full spring range by a selected portion of the controller output signal range. The 7400 Series is very versatile and, through an adjustment, may be double or triple split. standard, reduced, high capacity pilots The simple, sensitive pilot of the three-way valve type has sufficient capacity to operate the control valve at required speed and uses relatively little air. Pilots are available for standard, reduced or high capacity.
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