Koso EPB801 Electric Valve Positioner
Product Introduction
The Koso EPB801 Electric Valve Positioner is a critical accessory
for pneumatic control valves, designed to precisely regulate valve
position in industrial processes. It receives a 4–20 mA DC input
signal from a controller and converts it into a pneumatic output to
drive the valve, while mechanical feedback from the valve stem
ensures accurate position tracking. The positioner sends electrical
signals to the upper system for real-time monitoring, making it
essential for closed-loop control systems. With a rugged aluminum
alloy housing and multiple explosion-proof ratings, it suits
diverse industrial environments from -20°C to 80°C.
Product Features
Precision Control & Feedback:
Input Signal: Standard 4–20 mA DC (split ranges: 4–12 mA/12–20
mA/10–50 mA for EP-15/17/25/27 models).
Mechanical Feedback: Stem displacement is converted to electrical
signals for real-time system monitoring.
Versatile Actuator Compatibility:
Straight Stroke: 12–100 mm; Angular Stroke: 0–90 degrees.
Adaptable to small/large actuators via load control strategies and
cam mechanism adjustments.
Pneumatic Performance:
Gas Source Pressure: 0.14–0.16 MPa or 0.17–0.50 MPa.
Gas Consumption: 5 NL/min at 0.4 MPa; low-power amplifier design
reduces energy use.
Accuracy & Reliability:
Backlash: <1%; Dead Zone: <0.4% for precise valve
positioning.
Output Characteristics: Linear (configurable to quick-open,
percentage, etc., via cam mechanism).
Environmental & Safety Features:
Temperature Range: Flameproof: -20°C–60°C; Standard: -40°C–80°C.
Explosion-proof Types: Flameproof and ordinary models available.
IP Protection: Suitable for harsh environments with ≤90% relative
humidity.
Design & Installation:
Housing: Aluminum alloy (weight: 3.5 kg).
Air Connection: ZG1/4 thread for easy pneumatic integration.
Amplifier Conversion: Easily switches between positive/negative
action for single-acting actuators.
echnical parameters and performance:
Input Signal: Standard: 4-20 MADC.
Split: 4-12 MADC 12-20 MADC 10-50 MADC (ep-15.17. EP-25.27.) ...
Input impedance: 250 Euro (4-20 MADC)100 Euro (10-50 MADC).
Nominal Stroke: straight stroke: 12... 100 mm, Angle: 0-90 degrees
...
Gas source pressure: 0.14-0.16 mpa 0.17-0.50 mpa.
Gas Consumption: 5NL/min (when gas pressure is 0.4 MPa) ...
Backlash: less than 1% dead zone: less than 0.4% .
Output characteristics: linear (can be changed to fast open, such
as percentage characteristics) ...
Ambient temperature: Flameproof type-20-+ 60℃ normal type-40-+ 80℃
Relative Humidity: not more than 90% ...
Explosion-proof type: flame-proof type, ordinary type. ZG1/4 air
source interface ...
Case material: aluminum alloy. Weight: 3.5 kg
EPB800 series valve positioner features:
Apply to small capacity and large capacity actuator: adopt load
control missile policy, select the corresponding missile policy can
get suitable for the actuator positioner.
gas consumption is small: the power consumption of the amplifier is
small, the capacity is large.
Output characteristics can be selected: because there is a cam
mechanism in the feedback mechanism, output characteristics other
than the standard ones can be selected.
4various feedback mode corresponding model: as long as the
replacement of the cam device, can be used for the following
corresponding actuator.
* direct travel actuator: standard-------------EPB8O1 * Angular
Travel Actuator: Standard----. EPB8 02, easily converted to
reaction amplifier: when a single-action actuator requires reaction
control, a positive-action amplifier can easily be converted to a
negative-action amplifier.
| warrany | 1year |
| Environment temp | Standard model: -20 to +80° |
| Input signal | 4 to 20 |
