Woodward 8915-698

Digital guide

Product Name

3103 Gas Valve with TM-55 Actuator (3103/TM55 configuration).

Product Introduction

The 8915-698 is a Woodward configured package of the 3103 rotary sleeve gas metering valve with a TM-55 electro-hydraulic actuator, designed for industrial gas turbine fuel metering with high reliability and precise control.

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Detailed content

Technical Specifications

Valve type: 3103 rotary sleeve-and-shoe throttling gas valve
Actuator type: TM-55 electro-hydraulic integrating actuator
Metered fuel: natural gas, propane, ethane, methane
Fuel specific gravity: 0.5 to 1.05
Gas flow range: 23 to 18 144 kg/h (50 to 40 000 lb/h) based on 0.6 sp gr
Inlet pressure: up to 5861 kPa (850 psig) per current Woodward 3103 manual; up to 6206 kPa (900 psia) in earlier published data; 4964 kPa (720 psia) maximum under CE marking restriction
Differential pressure: 172 to 5861 kPa (25 to 850 psig)
Fuel temperature: -40 to +149 °C (-40 to +300 °F)
Actuator hydraulic supply pressure: 2758 to 8274 kPa (400 to 1200 psig)
Actuator operating temperature: -40 to +121 °C (-40 to +250 °F)
Actuator input signal: ±200 mA integrating
Accuracy: ±5% of point, or ±0.25% of maximum flow, whichever is larger; ±2% of point at stops
Hydraulic fluid: mineral or synthetic based oil, diesel fuel, kerosene, gasoline, or light distillate fuel
Recommended viscosity: 6.0 to 400 cSt (150–200 SSU; ISO 32 grade)
Hydraulic cleanliness: ISO 4406 20/18/15 minimum
Supply filter: 40 μm nominal; external filtration 10 μm nominal required

Features

Self-cleaning metering structure adapts to sour (high sulfur) gas service
Through-hardened stainless steel internal parts resist wear and corrosion
Inlet guide tube directs contaminants through the metering port to minimize accumulation
Internal mechanical feedback provides excellent open-loop accuracy
Optional electrical position transducer for accurate position indication
Dual-coil (redundant) torque motor option available
Factory biased toward minimum fuel position on loss of supply pressure or input current (fail-safe)
Adapter housing provides adjustable maximum/minimum flow stops and an adjustable minimum position indicator switch
UL Listed and CSA Certified

Application Scenarios

Industrial gas turbine generator sets
Gas turbine driven compressors
Combined heat and power (CHP) systems
Mechanical drive gas turbines
Sour gas / high sulfur fuel environments
Offshore and marine gas turbine packages

Performance Parameters

Maximum flow capacity depends on available gas conditions
Minimum slewing time of the actuator: 100 ms; time constant: 25 ms
Shearing force at sleeve outer diameter exceeds 1334 N (300 lb) to cut through light debris such as pipe scale
Flow turndown ratios up to 500:1

Material Composition

Valve body: stainless steel
Internal parts: through-hardened stainless steel
Seals: Viton (FKM) or other fuel-compatible elastomer
Actuator case: anodized aluminum
Hydraulic fluid is sealed from the torque motor by a preformed packing ring

Structural Characteristics

Rotary sleeve-and-shoe metering structure, excellent flow characteristics
Two standard port configurations available, with maximum flow areas of 645 mm² (1 in²) and 1290 mm² (2 in²)
Actuator integrates torque motor servovalve, spring-centered four-land spool valve, and double-acting servo piston
Metering sleeve support bearings positively sealed from gas
Two overboard drains provided on the valve body
Valve angle indicator furnished on the valve

Working Principle

The electronic control sends an electric command to the TM-55 torque motor servovalve. The torque motor generates a differential pressure that operates the second-stage spool valve, regulating hydraulic oil flow to both ends of a double-acting servo piston. Piston motion rotates the output shaft, positioning the 3103 rotary metering sleeve to change the effective port opening area. An internal electrical position feedback transducer signals back to the control for closed-loop positioning. On loss of hydraulic supply or electrical input, the actuator spring biases the valve toward the minimum fuel position.

Installation Requirements

Handle with care; abuse can damage seals, installation surfaces, and factory adjustments
Keep plastic shipping caps on hydraulic and gas connections until piping is complete
Provide a 10 μm (nominal) filter in the hydraulic supply line; maintain ISO 4406 20/18/15 cleanliness
Use a pressure switch to confirm correct hydraulic supply pressure before start-up and continuously thereafter
Plumb one overboard drain outside the turbine enclosure; plug the unused drain (do not plug both)
Install with any attitude; installation attitude does not affect actuator performance
The TM-55 is factory calibrated and drained; no additional cleaning or calibration is required before installation
Ensure the prime mover is equipped with an independent overspeed shutdown device

Usage Precautions

Maintain strict hydraulic fluid cleanliness; contamination directly affects actuator life and performance
Control solid particle contaminants: <10 μm diameter ≤ 30 ppm by volume; >10 μm diameter ≤ 0.3 ppm by volume
Do not attempt field disassembly of the TM-55 actuator or 3103 valve. Woodward recommends factory service or authorized overhaul
Observe electrostatic discharge (ESD) precautions when handling electronic components
In hazardous (classified) areas, wiring must comply with applicable regional electrical codes