Whittaker C422425 User manual

NOTICE: PROPRIETARY INFORMATIONOF WHITTAKER CONTROLS,INC., A BUSINESS UNIT OF MEGGITT PLC.
THE INFORMATION CONTAINED IN THIS DOCUMENT IS DISCLOSED IN CONFIDENCE. IT IS THE PROPERTY OF
WHITTAKER CONTROLS, AND SHALL NOT BE USED, DISCLOSED TO OTHERS, OR REPRODUCED IN WHOLE
OR IN PART WITHOUT THE EXPRESS WRITTEN CONSENT OF WHITTAKER CONTROLS. IF CONSENT IS GIVEN
THIS NOTICE SHALL APPEAR IN ANY SUCH REPRODUCTION.
REVISION 1.1 – 10/15/2004
Maintenance Manual
GAS VENT VALVE
1/2-INCH, SOLENOID OPERATED, 24 VDC
PART NUMBERS:
C422425
C422685
C422695
C422705
C423095
C423155

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page A
LIST OF EFFECTIVE PAGES
On a revised page, the portion of text or illustrations affected by the change is indicated by a vertical line
in the outer margin of thepage. When a revision is issued, the entire document is reissued with the current
revision number and date shown on all pages. For major revisions, the basic number is incremented. For
minor revisions, the number following the decimal is incremented. Dates of issue for original and subse-
quent revisions are as follows:
Revision 1.0 ...........................................10/01/2003
Revision 1.1 ...........................................10/15/2004
The total number of pages in this technical document is 18 consisting of the following:
Title, A, 1 – 16
TABLE OF CONTENTS
SUBJECT PAGE
Introduction .......................................................................4
Description and Operation ...........................................................7
Installation ......................................................................11
Fault Isolation ....................................................................15
LIST OF ILLUSTRATIONS
FIGURE PAGE
1. 1/2-Inch Gas Vent Valve ....................................................8
2. Electrical Schematic Diagram ................................................9
3. Key Dimensions ..........................................................13

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 1
LIST OF TABLES
TABLE PAGE
1. General Characteristics/Specifications ..........................................6
2. Detailed Characteristics/Specifications ........................................10
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS!
This manual contains important instructions that should be followed during installation and maintenance
of the Gas Vent Valve (valve). The following are general safety precautions that are not related to specific
procedures and therefore do not appear elsewhere in this publication. These are recommended precau-
tions that personnel must understand and apply during many phases of maintenance.
The valve is electrically actuated. Wherever electricity is present, there is the hazard of electrocution. Like
anyotherelectro-mechanicaldevice,thevalvecanbedangerousifitisimproperlyoperatedormaintained.
Safety Alert Symbols
Safetyalert symbolsareused inthismanual toidentifypotentialorimmediatepersonalinjuryhazards. The
safety alert symbol words are explained below:
DANGERindicatesanimminentlyhazardoussituationwhich,ifnot
avoided, will result in injury or serious injury.
WARNINGindicatesapotentiallyhazardous situationwhich, ifnot
avoided, could result in injury or serious injury.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a poten-
tially hazardous situation which, if not avoided, may result in pro-
perty damage.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 2
WEAR PROTECTIVE CLOTHING
!Wear protective clothing (gloves, apron, etc.) approved for the materials and tools being used.
USE APPROVED SAFETY EQUIPMENT
!When cleaners are being used, approved explosion-proof lights, blowers, and other equipment must
be used. Make sure that fire fighting equipment is readily available and in working order.
GIVE CLEANERS SPECIAL CARE
!Keepcleaners inspecialpolyethylenebottlesorinsafetycansandinminimumquantities.Discard soil-
ed cleaning rags into safety cans.
Equipment Safety Information
The following safety information briefly discusses hazards peculiar to the equipment, whichare likely to be
encountered during maintenance activity.
VALVE INSTALLATION PRECAUTIONS
!Thedesignofthepipingsystemmustprovideadequatepressureandtemperatureprotectiontoprevent
exceeding the limits of the valve.
!Flanged Piping Connections
CMake sure that the valve orientation is correct and install the valve in-line with the flanges. Make
sure that the piping flanges are properly positioned and spaced. Do not force the piping in order to
fit the valve. Do not use the flange bolting to pull the piping into the proper position.
CInstall the gaskets and the bolting, and torque per ANSI or API requirements.
CRe-torque the flange closure bolts after the first exposure to elevated temperature.
!Make sure that the valve cycles and operates correctly after installation.
VALVE OPERATION PRECAUTIONS
!Do not exceed the pressure/temperature limits of the valve.
!Do not lubricate the valve. Use of lubrication or sealants may void the warranty or cause pre-mature
failure of the valve.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 3
VALVE MAINTENANCE PRECAUTIONS
!Do not loosen any fasteners or attempt to removal the valve from the line until all pressure is isolated
and released from the system, with valve halfway closed to release the body cavity pressure.
GENERAL OPERATING LOCATION PRECAUTIONS
!This manual covers equipment for use under the following atmospheric conditions:
CAn oxygen concentration not greater then 21 percent by volume
CA nominal barometric pressure of one atmosphere
!During and after operation, all of the valve components are hot. Touching hot components can cause
painful injury.
!Use only authorized replacement parts or hardware.
!Observe proper Lock-Out/Tag-Out procedures when working on the valve and makesure that person-
nel protection equipment such as electrical grounds are installed.
!Make sure that all of the electrical wiring is properly terminated. Make sure that all of the wire terminals
are securely connected.
!Avoid hazardous voltage situations that can result from unsafe conditions such as, but not limited to
the following:
CImproper grounding
CHandling electrical leads or devices with wet hands or on wet ground
CDamaged electrical wire insulation
CImproper connection or re-connection of the power terminals.
CShort circuits to ground
OPERATION AND MAINTENANCE OF HIGH PRESSURE COMPRESSED GAS SYSTEMS
!Protect all gas lines from damage or puncture. Do not operate the valve if a gas leak is detected – this
could indicate a loose or damaged high pressure fitting.
!Do not use flammable solvents for cleaning parts.
!Check for tools, rags, or loose parts left in the area before resuming operation.
!Do not attempt to remove the valve from the system without first isolating it from the line pressure and
venting all of the trapped internal pressure.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 4
INTRODUCTION
1. Purpose of Manual
A. This technical manual contains instructions for operation and shop maintenance of the Gas
Vent Valve (valve). This manual is intended to provide information in sufficient detail to permit
proper fault isolation, maintenance, and repair of the equipment.
B. The valve operates as a component of a fuel metering system to control delivery of natural gas
to a gas turbine engine. Refer to Table 1 for system specifications/characteristics.
2. Revision Service
This manual will be revised as necessary to show the current information.
3. Weights and Measurements
Weights and measurements in this manual are expressed in both English (U.S. customary) and
Metric (SI) units.
4. Scope of Manual
The technical manual is divided as follows:
Introduction – Describes the purpose and scope of this manual.
DescriptionandOperation–Containsaphysicaldescriptionoftheequipmenttogetherwithexplan-
ations of its operation and component functions and characteristics.
Installation – Provides information for installing, connecting, and preparing the equipment for use.
Fault Isolation – Contains procedures for finding the cause of a malfunction.
Maintenance – Provides instructions for adjustment, and replacement of defective components.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 5
5. Symbols and Abbreviations
Symbols and abbreviations used in this technical manual are as follows:
AWG American Wire Gage
C Centigrade (Celsius)
DC Direct current
F Fahrenheit
Hz Hertz
kg Kilogram
kg/s Kilograms/second
kPa KiloPascal
LVDT Linear variable differential transformer
mm Millimeter
NPT National Pipe Thread
P/N Part Number
psi Pounds per square inch
psia Pounds per square inch, absolute
psid Pounds per square inch, differential
psig Pounds per square inch, gage
SPDT Single-pole, double-throw
VDC Volts direct current

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 6
Table 1. General Characteristics/Specifications
Application .......................................Gas Turbine Engine Fuel Gas Systems
Service Fluid .................... Natural Gas, LPG, Process Gases, Air, De-mineralized Water
Electrical Power ........................................ 24VDC Nominal (20 to 28 VDC)
Temperatures
Ambient ............................................. –40 to 212°F (–40 to 100°C)
Operating ............................................ –40 to 400°F (–40 to 204°C)
DESCRIPTION WHITTAKER PART NUMBER HAZARDOUS AREA RATING
Gas Vent Valve, Solenoid Operated, Normally
Open, 24 VDC, 1500 psig, 1/2-14 NPT Ports
(with Closed Position Indicating Switch)
C422425 Canada: Certified Explosion Proof,
Ex d IIB, Temp Code T3, Tamb –40
to 100°C. Certified to CAN CSA
E60079-0 and CAN CSA
E60079-1.
United States: Class 1, Division 1,
Groups C and D, T3 Ambient
Temperature Range –40 to 100°C
(certified to UL-1203).
Atex: 0359 II 2 G EEx
d IIB, Temp Code T3, Tamb –40 to
100°C.
Gas Vent Valve, Solenoid Operated, Normally
Open, 24 VDC, 1500 psig, 1/2-14 NPT Ports C422685
Gas Vent Valve, Solenoid Operated, Normally
Closed, 24 VDC, 1500 psig, 1/2-14 NPT Ports
(with Closed Position Indicating Switch)
C422695
C423095
C423155
Gas Vent Valve, Solenoid Operated, Normally
Closed, 24 VDC, 1500 psig, 1/2-14 NPT Ports C422705

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 7
DESCRIPTION AND OPERATION
1. Description and Operation (See Figure 1)
A. Part Numbers C422425 and C422685
The Gas Vent Valve is a solenoid operated poppet shutoff valve. The valve is normally spring-
loaded to its open position. When the solenoid is energized, the solenoid plunger overcomes
the spring force to close the valve. Refer to Figure 2 for the electrical schematic diagram. Refer
to Table 2 for the characteristics and specifications.
B. Part Numbers C422695, C422705, C423095 and C423155
The Gas Vent Valve is a solenoid operated poppet shutoff valve. The valve is normally spring-
loaded to its closed position. When the solenoid is energized, the solenoid plunger overcomes
the spring force to open the valve. Refer to Figure 2 for the electrical schematic diagram. Refer
to Table 2 for the characteristics and specifications.
C. Closed Position Indicating Switch Circuit (Part Number C422425, C422695, C423095 and
C423155 Only)
The valve is equipped with a position indicating switch that is actuated by the solenoid plunger.
When the valve is in its closed position, the switch circuit is closed.
2. Detailed Specifications (Refer to Table 2)

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 8
Figure 1. 1/2-Inch Gas Vent Valve

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 9
Figure 2. Electrical Schematic Diagram

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 10
Table 2. Detailed Specifications
Valve Type .............................................. Gas Vent, Solenoid Operated
Service Fluid .................... Natural Gas, LPG, Process Gases, Air, De-Mineralized Water
Pipe Size ........................................................1/2-inch (12,7 mm)
Pressures
Normal Range ..................................... 0to1500 psig (0 to 10 500 kPa)
Proof ................................................... 3000 psig (20 600 kPa)
Electrical Data
Voltage .......................................... 24VDC Nominal (20 to 28 VDC)
Current ...........................................1.0 ampere maximum at 24 VDC
Duty Rating ........................................................Continuous
Electrical Connections
Electrical Solenoid .................... Terminal Block, 6-32 screws, 14 or 16 AWG wires
Switch (if equipped) ................... Terminal Block, 6-32 screws, 14 or 16 AWG wires
Ground Connection ................................................ 14AWG wire
Position Indicating Switch (P/N C422425, C422695, C423095 and C423155 only)
Voltage ..............................................................28VDC
Current ........................................................... 2.5 amperes
Temperatures
Ambient ............................................. –40 to 212°F (–40 to 100°C)
Operating ............................................ –40 to 400°F (–40 to 204°C)
Weight (maximum) ................................................. 30pounds (14 kg)

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 11
INSTALLATION
1. General
This section contains information on installation and interfacing of thegas vent valve. Refer toFigure
3 for key dimensions.
2. Inspection
Prior to installation, visually inspect the valve for shipping damage and general condition. Make sure
that there are no missing parts, loose fittings or fasteners, or any other obvious defects.
DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE MAY BE
PRESENT.
NE VOUS OUVREZ PAS QUAND UNE ATMOSPHÈRE EXPLOSIVE
PEUT ÊTRE PRÉSENTE.
Make sure that the electrical power is off before removing the
terminal cover or touching the electrical wires.
Assurez-vous que le courant électrique est au loin avant d'en-
lever la couverture terminale ou toucher les fils électriques.
3. Gas Inlet and Outlet Ports
The gas inlet and gas outlet connection ports are internally threaded 1/2-14 ports.
4. Electrical Wiring
A. To gain access to the terminal block, remove the screws and washers and the terminal cover.
B. The electrical wiring entry into the terminal housing must be accomplished using methods ap-
proved by the local certification agencies (i.e., Cenelec, CSA, FM, etc.). Connect the conduit
to the 1/2-14 NPT conduit/entry port for using a suitable conduit connector. Torque the conduit
connector to 450 to 500 pound-inches (51 to 56 Nm).
C. All customer field wiring conductors must be 18 AWG minimum.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 12
D. Connectthefieldwiringforthesolenoid andposition indicatingswitch(whenapplicable)totheir
assigned terminals on the terminal block. Torque the wire terminal screws to 7 to 10 pound-
inches (0,8 to 1,1 Nm). Install an approved stopping block within 18 inches of the conduit entry
port.
E. Re-install the terminal cover with the screws and washers. Tighten the screws to 70 to 90
pound-inches (8 to 10 Nm).
F. Connect the grounding wire and torque the grounding terminal bolt to 35 to 40 pound-inches
(4 to 4,5 Nm).
5. Adjustments
No field adjustments are required.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 13
Figure 3. Key Dimensions (Sheet 1 of 2)

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 14
Figure 3. Key Dimensions (Sheet 2 of 2)

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 15
FAULT ISOLATION
1. General
Make sure that the electrical power is off before removing the
terminal cover or touching the electrical wires.
Assurez-vous que le courant électrique est au loin avant d'en-
lever la couverture terminale ou toucher les fils électriques.
This section contains specific checks required to fault isolate the gas vent valve during service. It is
assumed that the valve has been reported inoperative or has malfunctioned during operation.
2. Fault Isolation
A. Make sure that the electrical power is turned off and locked out.
B. Remove the screws and washers securing the terminal cover to the terminal housing, and re-
move the terminal cover.
C. Verify the electrical connections at the valve and the field wiring are correct. Refer to Figure 2
for the electrical schematic diagram.
D. Make sure that all of the wiring connections are secure and that there are no damaged wires.
E. If the wiring connections are all correct and secure, and the valve still will not operate, perform
isolation in accordance with the following paragraphs.
3. Solenoid Coil Resistance
A. Disconnect the wires connected to terminals 1 and 2.
B. Using an ohmmeter, measure the resistance between terminals 1 and 2. The resistance must
be 17 to 21 ohms.
C. If the resistance is not within the specified range, the solenoid coil is damaged. Replace the
valve. Return the failed valve to Whittaker Controls for repair.

WHITTAKER CONTROLS, INC.
A MEGGITT PLC COMPANY
MAINTENANCE MANUAL
GAS VENT VALVE
C422425 • C422685 • C422695 • C422705 • C423095 • C423155
INDUSTRIAL PRODUCTS GROUP Revision 1.1 10/15/2004 Page 16
4. Valve Position Indication Faults (Part Numbers C422425 and C422695 Only)
A. Disconnect the wires connected to terminals 3 and 4.
B. Using an ohmmeter, check for continuity between terminals 3 and 4. There must be an open
circuit path when the valve is de-energized.
C. If the position indication circuit path is complete (continuity), the position indicating switch has
failed. Return the faulty valve to Whittaker Controls for failure analysis, overhaul and proper
testing to certification.
5. Operation
A. If no faults are found in the preceding paragraphs, reconnect the field power input wiring to
terminals 1 and 2.
B. Apply 24 VDC electrical power between terminals 1 and 2. The valve should actuate open or
closed, depending on whether it as a normally open or normally closed valve (refer to Table 1
or Figure 2). If possible, verify that the valve position and flow status are correct.
C. If operation is not normal, return the faulty valve to Whittaker Controls for failure analysis, over-
haul and proper testing to certification. If operation is correct, proceed with the following steps.
D. Using an ohmmeter, check for continuity between terminals 3 and 4. There must be continuity
when the valve is energized.
E. If the position indication circuit path is open (no continuity), the position indicating switch has
failed. Return the faulty valve to Whittaker Controls for failure analysis, overhaul and proper
testing to certification.
F. Turn off and lock out the electrical power.
G. If no faults are found, the valve is operating correctly and may be returned to service.
H. If the valve is to be returned to service, re-install the terminal cover and secure it with the
screws and washers. Tighten the screws securely.
6. Equipment Returns
Prior to returning any equipment item to Whittaker Controls, please contact their Contracts Depart-
ment at 818-765-8160 for return shipment information and authorization.