Woodward Large Electric Sonic Valve II, Инструкция по установке и эксплуатации, Страница: 11 / 66

Manual 35076 LESV II
Woodward 9
Chapter 1.
General Information
Introduction
The Large Electric Sonic Valve (LESV II) controls the flow of gas fuel to the combustion system of an
industrial or utility gas turbine. The LESV II is an extension of the HR-LESV product line, and provides
increased fuel pressure and temperature capabilities.
The integral electric actuator consists of a brushless dc motor and gear train which drives a precision lead
screw for precise linear positioning. Dual resolvers are provided for motor commutation and position
sensing. The actuators include a return spring for fail-closed operation, The LESV II includes a high
temperature memory device (ID Module) which contains all the configuration and calibration information
to be read by the Digital Valve Positioner (DVP) when the valve/actuator is connected and powered up. A
soft stop cushion within the actuator is provided to protect the gear train and lead screw from damage
when the actuator impacts the seat during trip events.
This valve is intended to operate only with specific models of the Woodward Digital Valve Positioner
(DVP). Refer to manual B26773 for specifications and additional information on the operation and
configuration of the DVP5000 and DVP12000 (DVP5K and DVP12K). Contact your sales person for part
numbers for your specific applications.
The LESV II is also available with an optional position feedback sensor for a SIL2 light-off flow function.
The purpose of the sensor is to provide an independent valve shaft position feedback to be used for fuel
flowrate verification during turbine light off. See information in the following chapters for additional details.
Table 1-1. LESV II Large Electric Sonic Valve Specifications
2-Inch using the LELA
Actuator 3, 4, & 6-Inch using the LELA2
Actuator
Description 2, 3, 4, & 6-Inch (51, 76, 102, 152 mm) electrically actuated natural
gas sonic metering valve.
Mean Time Between Failure
(MTBF):
100,000 hrs of operation
Combined metering valve/actuator/DVP/cable subsystem.
Service Interval: Contact Woodward for recommended service interval.
Ambient Temperature Range: -29 to +93 °C (-20 to +200 °F) for models without SIL2 Flow Sensor
-29 to +80 °C (-20 to +176 °F) for models with SIL2 Flow Sensor
Storage Temperature Range: -40 to +93 °C (-40 to +200 °F)
Approximate Weights: 2-Inch: 119 kg / 263 lb. 3-Inch: 259 kg / 571 lb.
4-Inch: 299 kg / 659 lb.
6-Inch: 375 kg / 827 lb.
ACTUATOR
Description: Brushless dc motor with dual position feedback sensors.
Motor Coil Insulation Rating: Class H
Failure Mode: Spring type to drive valve to safe position with loss of signal
(Fail Close).
Bandwidth: 2-Inch LESV II: 35 rad/s with
no more than 6 dB attenuation
and less than 180 degrees
phase loss at ±2% magnitude
and minimum supply voltage at
DVP.
3, ”, and 6-Inch LESV II: 30 rad/s
with no more than 6 dB attenuation
and less than 180 degrees phase
loss at ±2% magnitude and
minimum supply voltage at DVP.
Visual Position Indication: Yes
Ingress Protection: IP55
Released