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Help CenterWoodward 8516-190 Pressure-Reducing Speed Regulator
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I. Core Positioning and Replacement Compatibility
Product Positioning: 12-screw mechanical-hydraulic speed reduction governor of the TG611‑13 series, adapted for 2400 rpm turbomachinery. It is applied in asynchronous operation scenarios to provide stable speed regulation and load adaptability, with an integrated OTD for enhanced system safety.Replacement Compatibility: Direct replacement for the older TG13 (2400 rpm, CCW) model, featuring compatible mounting holes, drive shaft and output shaft interfaces. The OTD function is newly added, and the product complies with ATEX explosion-proof standards.Key Identification: 8516-190 TG611‑13 (2400 RPM) ATEX, 12 Screw, CCW, w/OTD (with Overspeed Trip Device).
II. Working Principle and Structure
Speed Regulation Mechanism: The drive shaft senses the rotor speed and compares it with the internal set value. It controls the speed control valve via the rotating output shaft to adjust steam/fluid flow for stable speed maintenance (Woodward).Structural Design: Equipped with a stainless steel screw-type actuator and a die-cast aluminum housing. It integrates a ball joint assembly driven by the drive shaft for speed measurement and an oil pump for output force supply, featuring corrosion resistance and vibration resistance to adapt to harsh industrial environments (Woodward).Operation Logic: Adopts the speed reduction regulation mode without synchronization (constant speed) function, suitable for variable load working conditions and realized closed-loop control through mechanical-hydraulic feedback. The OTD automatically triggers shutdown in case of overspeed to enhance safety protection (Woodward).
III. Technical Parameters
| Parameter Item | Value | Remarks |
|---|---|---|
| Rated Speed | 2400 rpm | Optimized operating point |
| Maximum Speed | 2640 rpm | Instantaneous upper limit (1.1 times the rated speed) |
| Minimum Speed | 2160 rpm | Stable operating lower limit (0.9 times the rated speed) |
| Speed Droop Characteristic | 2% | Rated speed @ 2° speed droop setting |
| Idle Speed | 2010 rpm | No-load idle setting |
| Overspeed Setting | Per OTD Threshold | Trip shutdown protection |
| Output Rotation Direction | CCW | Fixed rotation direction |
| Structural Type | 12 Screw | Stainless steel screw-type |
| Explosion-Proof Certification | ATEX Compliant | Meets EU explosion-proof standards |
| Overspeed Protection | Integrated OTD | Supports overspeed trip function |
| Output Torque | 16 N·m (12 ft‑lb) | Rotary output terminal shaft |
| Applicable Scenario | API611 Steam Turbine | Asynchronous operation conditions |
IV. Installation and Maintenance
Installation Compatibility: Fully compatible with the older TG13 (2400 rpm, CCW) model, with identical mounting holes, drive shaft and output shaft interfaces for direct replacement. The newly added OTD wiring shall be connected to the safety circuit in accordance with manual specifications (Woodward).Lubrication Requirements: Use special lubricating grease; regularly inspect the lubrication status of the screw mechanism and bearings to prevent jamming and ensure regulation response speed.Maintenance Cycle: Conduct action calibration, leakage inspection and OTD function test every 6 months to ensure reliable regulation accuracy and overspeed protection.Environmental Adaptability: Operating temperature ranges from -40°C to +85°C, IP54 protection grade, with vibration and impact resistant design, suitable for Zone 2 hazardous areas.
V. Application Scenarios
Suitable for 2400 rpm turbine-driven equipment without the need for synchronous operation, including:
Pumps, compressors/turboexpanders
Pressure and inlet draft fans
Off-grid generators, industrial steam turbines
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