YOKOGAWA ALR121‑S00 Serial Communication Module Spare Parts In Stock

I. Product Introduction

The YOKOGAWA ALR121‑S00 is a TG series mechanical-hydraulic turbine governor, specifically designed for API 611 standard industrial turbines. It employs a drop control mode, requiring no external power supply. Driven by the turbine’s drive shaft, it monitors the unit’s speed in real time and automatically adjusts the inlet valve opening to stabilize the turbine’s operating speed. It is widely used in pumps, compressors, fans, and small turbine generator sets operating at non-constant speeds. This is a classic spare part model for older turbine projects in power plants and petrochemical plants, and is readily available for quick replacement.

II. Product Advantages and Features

1. Purely mechanical-hydraulic structure, it can operate independently without an external power supply. Speed ​​regulation continues even in power outages, ensuring high reliability.

2. Drop control mode allows for slight speed deviations with load changes, suitable for turbines that do not require constant speed (isochronous) operation.

3. Built-in integrated oil sump, oil pump, and speed measuring ball head assembly; self-sufficient hydraulic power, eliminating the need for an external pressure oil source, simplifying installation.

4. Counter-clockwise CCW drive shaft provides ample output torque, directly driving the turbine’s main steam valve actuator.

5. Cast aluminum housing provides weather protection, suitable for outdoor turbine installations.

6. Complies with NEMA-A control standards, suitable for explosion-proof hazardous areas, meeting HAZLOC and ATEX requirements.

7. Mature and universal components ensure convenient maintenance and low spare parts replacement costs.

8. Large output rotation stroke provides ample load adjustment range from no-load to full-load, with smooth speed response.

III. Technical Parameters

Brand and Model: YOKOGAWA ALR121‑S00

Product Type: Mechanical Hydraulic Speed ​​Regulator

Speed ​​Adjustment Range: 1200-2400 rpm

Rated Speed ​​Point: 2010 rpm, Speed ​​Variation Rate 2%

Drive Shaft Rotation Direction: Counterclockwise (CCW)

Terminal Output Shaft Torque: 16 N·m (12 ft-lb)

Internal Oil Pressure: 1034 kPa (150 psi)

Oil Supply Method: Integrated oil sump, self-supplying hydraulic oil

Housing Material: Die-cast aluminum alloy

Protection Performance: Weatherproof structure

Applicable Standards: API611, NEMA-A

Operating Ambient Temperature: -20℃ ~ +60℃

Installation Method: Mounted on turbine base

Original Factory Upgrade Replacement Model: 8516-175 (with overspeed test device)

Note: Complete installation manual and speed adjustment and debugging data are available upon request.

IV. Functional Description

1. Speed ​​Signal Acquisition: The speed measuring mechanism inside the governor, driven by the turbine drive shaft, senses the actual turbine speed in real time.

2. Speed ​​Comparison and Adjustment: The measured speed is compared with the internally set speed; hydraulic power is output when a deviation occurs.

3. Steam Valve Control Drive: The output rotational torque drives the turbine inlet steam regulating valve, changing the steam intake flow and correcting the unit speed.

4. Load-Speed ​​Reduction Regulation: When the turbine load increases, the speed decreases appropriately, achieving load distribution among multiple turbines.

5. Self-Supplying Hydraulic Oil: The built-in oil pump provides power oil to the speed regulating mechanism, maintaining the execution of speed regulation actions.

6. Independent Closed-Loop Speed ​​Regulation: The entire speed regulation system does not require an external control system; a single unit can complete the closed-loop control of the turbine speed.

V. Application Scenarios

– Petrochemical Plants: Turbine-driven centrifugal pump and compressor speed control

– Thermal Power Plants, Self-owned Power Stations: Spare parts replacement for small turbine auxiliary speed control systems

– Metallurgical Plants: Speed ​​control of industrial turbines for induced draft fans and forced draft fans

– Oil and Gas Transportation Projects: Turbine expander and turbine equipment speed regulation

– Old Turbine Retrofitting Projects: Replacement of aging and faulty TG-13 series mechanical speed governors

VI. Selection Recommendations

Before purchasing YOKOGAWA ALR121‑S00 , please confirm the following conditions:

1. Drive Shaft Rotation Direction: Confirm that the turbine output shaft rotates counterclockwise (CCW). Models with the opposite direction cannot be used.

2. Operating Speed ​​Range: Verify that the unit’s operating speed is within the 1200-2400 rpm adjustment range.

3. Control Mode Confirmation: This speed governor is a droop control and does not support constant speed isochronous operation. This model cannot be selected if constant speed is required.

4. Valve Torque Matching: Confirm that the operating torque required for the turbine speed regulating valve does not exceed the upper limit of the governor’s output torque.

5. Spare Parts Replacement: If overspeed testing is required, the upgraded model 8516-175 can be selected; after replacement, the speed must be readjusted.

Unsure about the turbine governor matching selection? Feel free to contact us for free technical consultation and support.

VII. After-Sales Service Guarantee

1. Supply Service: Turbine speed regulating spare parts are available in stock; inventory and delivery time can be checked.

2. Technical Support: Installation alignment guidance, speed setting and commissioning consultation, and troubleshooting.

3. Warranty Service: Products enjoy standard warranty; non-human-caused damage during the warranty period is handled according to the after-sales terms.

4. Supporting Documents: Governor hardware manuals and commissioning parameter documents are available.

5. One-Stop Support: We can supply other Woodward series turbine governors, electro-hydraulic converters, and other accessories.