1
TABLE OF CONTENTS
HAZARD IDENTIFICATION
Definitions for identifying the various hazard levels are provided below.
This safety alert symbol indicates important safety messages. When you see this symbol, be alert to the
possibility of personal injury. Carefully read and fully understand the message that follows.
NOTICE
The use of the word “NOTICE” identifies special instructions that are
important but not related to hazards.
The use of the word “CAUTION” identifies possible hazards or unsafe prac-
tices that could result in personal injury and product or property damage if
instructions, including recommended precautions, are not followed.
The use of the word “WARNING” identifies the presence of hazards or un-
safe practices that could result in death or serious personal injury if in-
structions, including recommended precautions, are not followed.
® Registered Trademark of Victaulic
© Copyright 2002 Victaulic
Printed in U.S.A.
Hazard Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Installer Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . .2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Trim Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Exploded View Drawing - Trim Components. . . . . . . . . . .4
Exploded View Drawing - Internal Valve Components . . .5
Series 758 Preaction Valve with Series 79N Electric/
Pneumatic Actuator – Trim Assembly
Drawing Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Section View Drawing and Description – 79N Electric/
Pneumatic Actuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Section View Drawing and Description – Series 746
Dry Accelerator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Compressor and Air Maintenance Trim Requirements . .8
Air Supply Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Proper Air Supplies for Series 758 Preaction
Valves Used with Series 79N Electric/Pneumatic
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Proper Air Supplies for Series 758 Preaction
Valves Used with Series 79N Electric/Pneumatic
Actuators and Series 746 Dry Accelerators . . . . . . . . . .9
Important Installation Information. . . . . . . . . . . . . . . . . . . .9
Valve/Trim Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Important Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Hydrostatic Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Placing the System in Service . . . . . . . . . . . . . . . . . . . . . .11
External Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Weekly Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Monthly Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Required Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Main Drain Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Water Flow Alarm Test . . . . . . . . . . . . . . . . . . . . . . . . . 18
Water Level and Low-Air Alarm Tests . . . . . . . . . . . . 20
Trip Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Partial Trip Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Full Trip Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Required Internal Inspection . . . . . . . . . . . . . . . . . . . . . . 26
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Removing and Replacing Clapper Seal . . . . . . . . . . . . 28
Removing and Replacing Clapper Assembly . . . . . . . 30
Installing Cover Plate Gasket and Cover Plate . . . . . . 31
Removing and Replacing Piston Assembly . . . . . . . . 32
Replacing the Strainer Screen for Series 79N
Electric/Pneumatic Actuators . . . . . . . . . . . . . . . . . . . 33
Troubleshooting – Series 79N Electric/Pneumatic
Actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Troubleshooting – Series 746 Dry Accelerator . . . . . . . . 34
Troubleshooting – System . . . . . . . . . . . . . . . . . . . . . . . . 34
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B/C
Facilities Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B/C
DISCONTINUED
PRODUCT
