Woodward 1907 User manual

Product Manual 40053
(Revision B)
Original Instructions
1907 Liquid Fuel Valve/Limiter
Installation and Operation Manual

General
Precautions
Read this entire manual and all other publications pertaining to the work to be
performed before installing, operating, or servicing this equipment.
Practice all plant and safety instructions and precautions.
Failure to follow instructions can cause personal injury and/or property damage.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, on the publications
page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
Proper Use
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or
property damage, including damage to the equipment. Any such unauthorized
modifications: (i) constitute "misuse" and/or "negligence" within the meaning of
the product warranty thereby excluding warranty coverage for any resulting
damage, and (ii) invalidate product certifications or listings.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken. Copyright © Woodward 1973
All Rights Reserved

Manual 40053 1907 Liquid Fuel Valve/Limiter
Woodward i
Contents
WARNINGS AND NOTICES............................................................................III
ELECTROSTATIC DISCHARGE AWARENESS ................................................. IV
CHAPTER 1. GENERAL INFORMATION...........................................................1
Introduction.............................................................................................................1
Description..............................................................................................................1
Specifications .........................................................................................................1
CHAPTER 2. INSTALLATION..........................................................................2
Introduction.............................................................................................................2
Adjustments............................................................................................................2
CHAPTER 3. PRINCIPLES OF OPERATION .....................................................4
Introduction.............................................................................................................4
General...................................................................................................................4
Starting ...................................................................................................................4
Acceleration............................................................................................................4
Steady State...........................................................................................................4
Deceleration ...........................................................................................................5
Bypass Feature ......................................................................................................5
Failsafe Feature......................................................................................................5
Auxiliary Start Feature (optional)............................................................................5
Input Shaft Torsion Spring (optional)......................................................................6
Relief Valve (optional) ............................................................................................6
CHAPTER 4. MAINTENANCE.........................................................................8
Troubleshooting......................................................................................................8
Disassembly ...........................................................................................................9
Cleaning................................................................................................................10
Inspection .............................................................................................................10
Assembly..............................................................................................................10
Testing and Calibration.........................................................................................11
CHAPTER 5. REPLACEMENT PARTS ...........................................................12
CHAPTER 6. SERVICE OPTIONS .................................................................16
Product Service Options.......................................................................................16
Woodward Factory Servicing Options..................................................................17
Returning Equipment for Repair...........................................................................17
Replacement Parts...............................................................................................18
Engineering Services............................................................................................18
How to Contact Woodward...................................................................................19
Technical Assistance............................................................................................19

1907 Liquid Fuel Valve/Limiter Manual 40053
ii Woodward
Illustrations and Tables
Figure 2-1. Outline Diagram and Adjustment Locations ........................................3
Figure 3-1. Schematic Diagram. 1907 Liquid Fuel Valve/Limiter...........................7
Figure 3-2. Schematic Diagram, 1907 Liquid Fuel Valve/Limiter with Auxiliary
Features.............................................................................................7
Figure 4-1. Measurement of Fuel Limit Lever Position...........................................9
Figure 5-1. Exploded View ...................................................................................13
Figure 5-2. Exploded View ...................................................................................15

Manual 40053 1907 Liquid Fuel Valve/Limiter
Woodward iii
Warnings and Notices
Important Definitions
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
DANGER—Indicates a hazardous situation which, if not avoided, will result
in death or serious injury.
WARNING—Indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION—Indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE—Indicates a hazard that could result in property damage only
(including damage to the control).
IMPORTANT—Designates an operating tip or maintenance suggestion.
Overspeed /
Overtemperature /
Overpressure
The engine, turbine, or other type of prime mover should be
equipped with an overspeed shutdown device to protect against
runaway or damage to the prime mover with possible personal injury,
loss of life, or property damage.
The overspeed shutdown device must be totally independent of the
prime mover control system. An overtemperature or overpressure
shutdown device may also be needed for safety, as appropriate.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage. Always
wear the appropriate personal protective equipment (PPE) for the job
at hand. Equipment that should be considered includes but is not
limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Automotive
Applications
On- and off-highway Mobile Applications: Unless Woodward's control
functions as the supervisory control, customer should install a
system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property damage.

1907 Liquid Fuel Valve/Limiter Manual 40053
iv Woodward
Battery Charging
Device
To prevent damage to a control system that uses an alternator or
battery-charging device, make sure the charging device is turned off
before disconnecting the battery from the system.
Electrostatic Discharge Awareness
Electrostatic
Precautions
Electronic controls contain static-sensitive parts. Observe the
following precautions to prevent damage to these parts:
Discharge body static before handling the control (with power to
the control turned off, contact a grounded surface and maintain
contact while handling the control).
Avoid all plastic, vinyl, and Styrofoam (except antistatic versions)
around printed circuit boards.
Do not touch the components or conductors on a printed circuit
board with your hands or with conductive devices.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715, Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.
Follow these precautions when working with or near the control.
1. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
2. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
Do not touch any part of the PCB except the edges.
Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.

Manual 40053 1907 Liquid Fuel Valve/Limiter
Woodward 1
Chapter 1.
General Information
Introduction
The 1907 Liquid Fuel Valve/Limiter meters fuel to gas turbines under all
operating conditions. The fuel valve is mechanically linked to and operated by a
governor actuator which determines the amount of fuel flow required for any gas
turbine mode of operation. The limiter function overrides the actuator input during
starting and rapid acceleration, thereby preventing excessive heating of the gas
turbine.
Description
The fuel valve/limiter consists essentially of three sections: a fuel metering valve,
a bypass valve, and an acceleration limiter. The fuel metering valve section
consists of a hollow plunger housed within a ported sleeve. The end of the
plunger is held in contact with either the input lever or the fuel limiter lever by a
spring. The size and shape of the metering port is determined by the turbine fuel
flow requirements. The bypass valve section consists of a spring-loaded rolling
diaphragm which senses both fuel inlet and outlet pressure to control the position
of a bypass valve plunger in a ported sleeve. An adjustment is provided for
positioning the bypass valve sleeve. The acceleration limiter section consists of a
spring-loaded rolling diaphragm mechanically linked to the fuel limiter lever.
Adjustment of the fuel limiter lever is provided to change the fuel flow to CDP
ratio.
Specifications
Refer to Figure 2-1 for fuel valve/limiter outline and mounting data.
Fuel Types: aviation gasoline, JP-4, JP-5, or diesel fuel
Specific Gravity: 0.70 to 0.85
Fuel Flow: 100 to 3120 lb/h (45 to 1415 kg/h)
Fuel Pressures:
Inlet 950 psig max. (6550 kPa max.)
Outlet 900 psig max. (6206 kPa max.)
CDP 155 psig max. (1069 kPa max.)
Static Test 1400 psig (9653 kPa)
The 1907 small liquid fuel valve may be configured without a CDP
acceleration fuel limiter. Without the CDP acceleration limiter option,
the input to meter fuel flow during all operating conditions is through
the input shaft from the governor/actuator system.

1907 Liquid Fuel Valve/Limiter Manual 40053
2 Woodward
Chapter 2.
Installation
Introduction
Mount the fuel valve/limiter square with the governor actuator linkage to prevent
binding. This unit is calibrated before shipment, and a minimum use of
adjustments is recommended. If adjustments are necessary, refer to Figure 2-1
for adjustment locations and proceed as follows.
Adjustments
1. The fuel level adjustment screw increases the fuel flow limit for any given
CDP value when turned counterclockwise.
2. The minimum limiter stop screw increases the minimum fuel limit when
turned clockwise.
3. The minimum fuel stop screw increases the minimum speed setting when
turned clockwise.
4. The maximum fuel stop screw increases the maximum speed setting when
turned counterclockwise.
5. The specific gravity adjustment changes the pressure drop across the
metering port. It is set by loosening the two screws holding the plate and
turning the socket-head screw, aligning its scribe mark with the desired
specific gravity mark on the plate.
6. The adjustable limiter lever (internal adjustment) changes the ratio of fuel
flow to CDP.
This adjustment should be made only where adequate test facilities
are available.

Manual 40053 1907 Liquid Fuel Valve/Limiter
Woodward 3
Figure 2-1. Outline Diagram and Adjustment Locations
(Do not use for construction.)

1907 Liquid Fuel Valve/Limiter Manual 40053
4 Woodward
Chapter 3.
Principles of Operation
Introduction
Figures 3-1 and 3-2 show the relationship of various parts of the fuel
valve/limiter. The connecting fuel passages between parts are simplified for ease
in visualizing the system.
General
The fuel valve/limiter is used in conjunction with a governor actuator. Fuel is
metered to the turbine for starting, acceleration, steady state operation, and
deceleration. The limiter section meters fuel flow during acceleration as a
function of turbine CDP. During steady state operation, fuel flow is controlled by
the mechanical linkage from the governor/actuator.
Starting
The fuel limiter will be in the minimum acceleration fuel position with the limiter
lever against the minimum limiter stop screw. The adjustable limit lever controls
the position of the metering piston. Under these conditions, the metering
discharge port is opened sufficiently to allow the required starting fuel flow. Fuel
from the fuel pump enters the inlet port (P1) where it is directed through the
metering pore to the discharge port (P2) and then to the engine. Excess fuel is
returned to the pump inlet through the bypass valve.
Acceleration
As the gas turbine attains ignition speed, the governor actuator rotates the
governor connecting lever to the maximum fuel position and moves the input
lever clockwise away from the metering piston. However, the metering piston is
held in the starting position by the adjustable limiter lever. Following ignition, the
gas turbine accelerates toward the governor speed setting. CDP increases with
turbine speed, causing the limiter diaphragm to move away from the minimum
limiter stop and rotate the adjustable limiter lever counterclockwise. The piston
loading spring now moves the metering piston upward, allowing more fuel to flow.
This action continues until the turbine reaches the set governor speed.
Steady State
When the turbine has accelerated to the governor preset speed, the governor
rotates the governor connecting lever counterclockwise to decrease fuel. In this
condition, fuel flow is regulated by the governor, which increases or decreases
fuel as a function of speed.