NE724/726 Electro Pneumatic Valve Positioner

NE700 Electro Pneumatic Valve Positioner-Data Sheet (PDF Download)

NE positioners

These electro-pneumatic positioners operate on a milliampere signal from a controller. They accurately position the control valve assembly in response to a change in input signal.

Metso valve positioner Neles NE724 electro pneumatic positioner is proportional positioners for control valves. NE724 valve positioner is an electro-pneumatic positioner that provides pneumatic output proportional to a standard milliampere DC input. Both units can be used with either cylinder or diaphragm type actuators for rotary or linear valves to provide excellent repeatability and accuracy in a wide range of throttling applications.

The nominal input resistance is 190 ohms. The moving force coil assembly has low mass and is accurately balanced to assure proper function even in severely vibrating applications. The dynamic behaviour of the positioner can be changed by choosing different size pilot valves.

FEATURES

Excellent vibration resistance

Rugged construction, few parts, small moving mass, compact design and rigid mounting provide outstanding vibration resistance.

Field reversible

Valve Positioner can be set for direct or reverse-acting modes by simply turning around the changeover piece and feedback cam without touching or changing tubings between actuator and positioner. Split-range and reverse actions are standard on the feedback cam.

Easy and fast to calibrate

Calibrations can be easily made with the positioner cover removed. You can fine-tune zero and range adjustments with minimal effect on set points.

Fast response times

Multiple pilot valve sizes are used to match positioner capacity compatibility with actuator stroke volume, minimizing response time.

Stable operation

Changes in supply pressure and valve load have minimal effect on positioner operation.

These electro-pneumatic positioners operate on a milliampere signal from a controller. They accurately position the control valve assembly in response to a change in input signal.

The nominal input resistance is 190 ohms. The moving force coil assembly has low mass and is accurately balanced to assure proper function even in severely vibrating applications.

The dynamic behaviour of the positioner can be changed by choosing different size pilot valves.

The positioner is equivalent to the brain of the valve, the direct executor of the valve action, the good seismic performance and oil resistance ability of the electro pneumatic valve positioner are well received by users, and the high service life has reduced the process downtime, and Can guarantee traffic and pressure control more stable and accurate. The market share of positioner in China is high in the China Market Paper Industry;

The NE Electro pneumatic Valve Positioner Position Pacific Pall Section uses a spool, and the gas source is filtered through the secondary internal filtration, even if the spool is dirty, it can also be used after cleaning, easy to maintain, and the positioner The slider size can be selected according to the size of the actuator, so that the valves of different sizes have better response consistency, improve the dynamic characteristics of the valve; the spool assembly can be detachable, other modules (such as coils, nozzle plates, etc.) Demolition and replacement is used; the pressure valve control is used as the other positioner gas path portion. High supply requirements, once blocked, it is difficult to clean, can only be replaced; due to the digital signal control, when the control signal fluctuates, the piezoelectric valve control is easily unstable, and the pneumatic output will fluctuate, easy to "crash" "The piezoelectric valve size is fixed, and cannot select piezoelectric valve and gain coefficient according to the size of the actuator. The response speed of different sizes of valves is inconsistent, and the regulation of the path can be oscillated, the dynamic characteristics of the regulating valve are poor; too much Module combination design, it is difficult to disassemble and replace independently, once the damage can be replaced; when the vibration is large, the circuit board and the piezoelectric valve module are easy to contact, and the corrected wheel connector is easily unclear;

The V-type adjustment ball valve and disc valve, the diameter ≥ DN 250 O-adjusting ball valve, recommended NE726 / S1; other caliber valve suggestions selected NE724 / S1