Woodward 8516-040

Woodward 8516-040

Product Introduction
The Woodward 8516-040 is a self-contained, mechanical-hydraulic speed droop governor specifically engineered for API611 steam turbines. It is designed to drive pumps, compressors, or generators where strict isochronous (constant-speed) operation is not required. This robust device autonomously controls turbine speed by sensing rotor speed and dynamically adjusting the inlet steam flow.

Request Quote
Category:

Description

Woodward 8516-040

Technical Specifications

  • Speed Setting Range: Adjustable via screw from 2400 to 4000 RPM.
  • Rated Speed-Droop: 2° droop at 4035 RPM.
  • Drive Shaft Rotation: Counterclockwise.
  • Rotary Output Torque: 23.7 N·m (17.5 ft-lb) counterclockwise.
  • Safety Features: Integrated Overspeed Test Device (OTSD) rated for ATEX hazardous locations.

Functional Features

  • Independent Operation: Utilizes an integrated driveshaft-driven oil pump to generate the necessary hydraulic force without external power.
  • Direct Valve Actuation: Features a rotary output terminal shaft that connects directly to the turbine’s governor valve to modulate inlet steam.
  • Speed Sensing: Employs an integrated driveshaft-driven ball head assembly to precisely sense turbine rotor speed.
  • Mechanical Feedback: Compares actual mechanical speed against an internal set point to maintain stable droop characteristics.

Application Scenarios
Extensively deployed in industrial steam turbine applications driving mechanical loads such as centrifugal pumps, air compressors, and standalone electrical generators.

Performance Parameters

  • Control Type: Mechanical-hydraulic speed droop control.
  • Response: Direct mechanical linkage ensures rapid, fail-safe response to speed deviations.
  • Safety Compliance: OTSD mechanism allows for reliable overspeed testing in classified environments.

Material Composition
Constructed with a durable TG-17 die-cast aluminum housing that provides excellent corrosion resistance and lightweight structural integrity. Internal hydraulic components are precision-machined steel.

Structural Characteristics

  • Form Factor: Compact, self-contained mechanical module.
  • Mounting: Flange-mounted directly to the steam turbine gearbox or casing.
  • Interfaces: Mechanical input drive shaft and rotary output terminal shaft.

Working Principle
The governor is driven by the turbine’s input shaft, spinning the internal ball head assembly. As turbine speed changes, the centrifugal force on the ball head alters its position. This mechanical movement shifts the hydraulic pilot valve, directing oil pressure to move the rotary output shaft, which in turn adjusts the steam control valve to restore the target speed.

Installation Requirements

  • Must be securely bolted to the turbine with precise shaft alignment to prevent mechanical binding.
  • The rotary output shaft must be correctly coupled to the turbine’s steam valve linkage.
  • Ensure the drive shaft rotation matches the counterclockwise specification.

Usage Precautions

  • Regularly test the integrated OTSD to verify overspeed protection functionality.
  • Maintain clean hydraulic oil to prevent sticking of the internal pilot valve.
  • Inspect mechanical linkages for wear or looseness during scheduled maintenance.

Related products