Product Overview
The Bürkert 8791 (Part No. 00234576) is a high-precision electropneumatic positioner engineered for the closed-loop control of pneumatically actuated process valves. As a member of Bürkert’s proven 8791 series, this unit converts a standard electrical control signal (4–20 mA or 0–10 V) into a proportional pneumatic output pressure, enabling accurate positioning of linear and quarter-turn actuators. The device operates on a force-balance feedback principle, where an internal position sensor continuously compares the actual valve stem position against the commanded setpoint, and the integrated control electronics adjust the pilot air output to eliminate deviation. This makes the 8791 a critical component in process automation loops where precise throttling, flow regulation, and reliable shut-off are required across chemical, pharmaceutical, water treatment, and general industrial fluid handling systems.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Electropneumatic Positioner (Process & Pneumatic Valve Control) |
| Model Designation | Bürkert 8791 / 00234576 |
| Control Signal Input | 4–20 mA / 0–10 V (standard analog setpoint) |
| Pneumatic Supply Pressure | Up to 6 bar (86 psi) filtered instrument air |
| Actuator Compatibility | Single- and double-acting linear & quarter-turn pneumatic actuators |
| Mounting & Connection | Standard NAMUR / ISO 5211 interface with G 1/4 pneumatic ports |
| Protection Class | IP65 / IP67 rated enclosure for harsh industrial environments |
Engineering Features & Advantages
- Precision Performance: High-resolution position feedback and fast-acting pilot valves deliver accurate, repeatable stem positioning with minimal hysteresis, ensuring tight process control.
- Industrial Reliability: Robust die-cast aluminum housing and non-contacting position sensing are built for continuous operation under severe industrial conditions, including vibration and temperature fluctuation.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Bürkert OEM standards, including NAMUR mounting and standardized pneumatic porting for straightforward retrofit.
- Flexible Configuration: Supports both single-acting and double-acting actuators, with adjustable zero and span for easy commissioning across a wide range of valve strokes.
Typical Industrial Applications
The Bürkert 8791 electropneumatic positioner is widely deployed in chemical and pharmaceutical processing for precise control of control valves and butterfly valves, in water and wastewater treatment for modulating flow and pressure regulation, in food and beverage production for hygienic process valve actuation, and in general industrial automation where accurate pneumatic valve positioning is essential for maintaining product quality, safety, and energy efficiency.
PRODUCT IMAGES
BURKERT 8791 / 00234576 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.
Shop the genuine Burkert 8791 / 00234576 Solenoid Control Valve. This Germany-made 24V DC hydraulic component features a direct-acting plunger design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.