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.
Description and Operation – Contains a physical description of the equipment together with explan-
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.
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