Product Overview
The Bürkert 8791 is a high-precision electropneumatic positioner engineered for continuous control of pneumatically actuated process valves. As a member of Bürkert’s ELEMENT series, the Type 8791 combines a compact, robust housing with advanced microprocessor-based control electronics to deliver accurate valve stem positioning in response to a standard analog setpoint signal (4–20 mA or 0–10 V). The unit operates on a force-balanced feedback principle, continuously comparing the actual valve position against the commanded setpoint and modulating the pneumatic output pressure to the actuator accordingly. This closed-loop control architecture ensures minimal deviation, fast response times, and excellent repeatability, making the 8791 a critical component in automated process control loops across chemical, pharmaceutical, water treatment, and general industrial fluid handling systems.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Electropneumatic Positioner (Process & Pneumatic Valve Accessory) |
| Model Designation | Bürkert Type 8791 (ELEMENT Series) |
| Control Signal Input | 4–20 mA / 0–10 V analog setpoint (standard industrial signal) |
| Pneumatic Supply Pressure | Up to 6 bar (87 psi) instrument air, filtered and dry |
| Operating Pressure | Standard Industrial Grade (up to rated bar) |
| Actuator Compatibility | Single- and double-acting pneumatic linear and rotary actuators |
| Position Feedback | Non-contact magnetoresistive (MR) sensor element |
| Mounting & Connection | Standard ISO / Manufacturer Interface (NAMUR / Bürkert yoke mount) |
| Protection Class | IP65 / IP67 (depending on configuration) |
| Housing Material | Die-cast aluminum or PA (polyamide) depending on variant |
Engineering Features & Advantages
- Precision Performance: Microprocessor-controlled closed-loop positioning delivers high accuracy, excellent repeatability, and minimal hysteresis for demanding process control applications.
- Fast Response & High Air Capacity: Optimized pneumatic pilot stage ensures rapid valve actuation and stable control even with large actuator volumes.
- Non-Contact Position Sensing: Magnetoresistive sensor eliminates mechanical wear on the feedback element, extending service life and reducing maintenance intervals.
- Industrial Reliability: Designed for dependable long-term operation in demanding industrial environments, with quality bearings and sealing systems ensuring extended maintenance intervals.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original BURKERT OEM standards, ensuring drop-in replacement without modification to existing manifolds or piping.
Typical Industrial Applications
This closed-loop control architecture ensures minimal deviation, fast response times, and excellent repeatability, making the 8791 a critical component in automated process control loops across chemical, pharmaceutical, water treatment, and general industrial fluid handling systems.
PRODUCT IMAGES
BURKERT 8791 Electropneumatic Positioner
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- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
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