Series 751 FireLock® Alarm Check Valve
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TABLE OF CONTENTS
Hazard Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installer Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Maintenance and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Trim Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Exploded View Drawing – Trim Components . . . . . . . . . . . . . . . . . . . . 4
Exploded View Drawing – Trim Components (Canada Only) . . . . . . . . 5
Exploded View Drawing – Internal Valve Components. . . . . . . . . . . . . 6
Series 751 Alarm Check Valve –
Trim Assembly Drawing Numbers . . . . . . . . . . . . . . . . . . . . . . . . . 7
Series 751 Alarm Check Valve for Use with Excess Pressure
Pump (Canada Only) – Trim Assembly Drawing Numbers . . . . . . . 7
Important Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Valve/Trim Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hydrostatic Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Placing the System in Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
External Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Monthly Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Required Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Main Drain Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Required Internal Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Removing and Replacing the Clapper Seal for
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- 3-inch (40 – 80-mm) and 8-inch (200-mm) Size Valves. . . . 14
Removing and Replacing the Clapper Seal for
4 – 6-inch (100 – 150-mm) Size Valves . . . . . . . . . . . . . . . . . . . . 16
Removing and Replacing the Clapper Assembly (All Sizes) . . . . . 17
Installing the Cover Plate Gasket and Cover Plate . . . . . . . . . . . . . 18
Troubleshooting – Series 751 Alarm Check Valve . . . . . . . . . . . . . . . 20
Facilities Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B/C
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 per-
sonal injury. Carefully read and fully understand the message
that follows.
WARNING
• The use of the word “WARNING” identifies the presence of hazards
or unsafe practices that could result in death or serious personal
injury if instructions, including recommended precautions, are not
followed.
CAUTION
• The use of the word “CAUTION” identifies possible hazards or
unsafe practices that could result in personal injury and product or
property damage if instructions, including recommended precau-
tions, are not followed.
NOTICE
• The use of the word “NOTICE” identifies special instructions that
are important but not related to hazards.