Samson 4763 electro-pneumatic positioner adopts compact, low-maintenance design and die-cast aluminum housing. It is an accessory for linear actuators conforming to IEC 60534-6. Samson 4763 electro-pneumatic positioner has an excellent dynamic response. Samson 4763 electro-pneumatic positioner has an adjustable ratio (P) frequency band, and adjustable air output, low supply air consumption.
The electro-pneumatic positioner is used for the correlation between the valve stem position and the input signal received from the controller. In this case, the input signal accepted from the control device is compared to the travel of the control valve, and pneumatic signal pressure is delivered.
The positioner consists of an i/p converter unit and the pneumatic section including the lever, shaft, and range spring, plus the control system composing nozzle, flapper, and booster. The input signal is directly fed to the i/p converter unit and converted to a proportional air pressure signal pe. Any change of the input current signal causes a proportional change of the air pressure pe sent to the pneumatic control system. The air pressure pe, in turn, produces a force that acts on the surface of the measuring diaphragm and is compared to the force of the range spring. The motion of the diaphragm is transferred to the flapper via the feeler pin, and the nozzle releases pressure. Any change of either the air pressure pe or the valve stem position causes the pressure to change in the booster connected downstream of the nozzle. The signal pressure pst which is released causes the plug stem to assume a position based on the input signal. The adjustable volume restriction Q and Xp restriction are used to optimize the control loop. The range spring, which can be exchanged, is assigned to both the rated valve travel and the nominal voltage of the input signal.
|Product name||Samson 4763 electro-pneumatic positioner|
|Annex||Linear actuator, single acting|
|Explosion proof||Type of protection “intrinsically safe”
|Control loop||4 to 20 mA
0 to 20 mA
1 to 5 mA
|Optional solenoid valve||Not needed|
|Valve diagnosis||Not needed|
|Controlled variable (travel)||7.5 to 60 mm, with 90 mm lever extension|
|Range spring||See table on page 14 for selection|
The main application areas of valve positioners include:
1. Coal gasification project
2. Clean energy gasification unit
5. Water supply and water treatment
6.Pulp and paper
8. Food and beverage
9. Life sciences and other fields
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