Koso EPB801 Electric Valve Positioner for Accurate Positioning

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.

Xi'an Kacise Optronics Co.,Ltd. is a professional manufacturer of measuring instruments , located in China xi’an City. Since 2008, Xi'an Kacise focused on the development and production of pressure, level and flow measuring instruments .

We have been specializing in manufacturing pressure, level and flow measuring instruments and related products for 10 years. Based on experienced technical and management personnel, through efforts of our entire staff, we have become a professional measuring instrument manufacturer and solution provider. And we are continuously trying to improve product quality.

Xi'an Kacise is qualified with ISO 9001-2008, GJB 9001B-2009, CE, intrinsic safety explosion-proof and isolated safety explosion-proof certificates, etc. which ensure that our products comply with international standards.

Kacise sensors have already been exported to America, Spain, Australia, Chile and 20 other countries and regions, and received many favorable feedbacks. Our overseas distributers are also increasing. We regard “reasonable prices, efficient production time and good after-sales service” as our tenet, and hope to cooperate with more customers for mutual development.

Our goal is simple: to sell the best products at the best prices, and provides industry-leading customer service. We personally get to know each of our customers, and we know how to discover the most valuable part of our business , to help others achieve their goals.