INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
Figures 251-D & 251-U Single-Increasing
Figures 252-D & 252-U Double Increasing
Air-Cushioned Lever & Weight
Swing Check Valves
TABLE OF CONTENTS
Introduction
….…………………………
1
Description of Operation .....
…………
1
Receiving & Storage .....
………………
1
Installation ......
………………………….
1
Valve Construction ......
……………….
2
Start-Up ...
……………………………….
2
Preventive Maintenance ....
…………..
2
Trouble Shooting ...
……………………
2
Disassembly ....
…………………………
2
Assembly ....
…………………………….
3
Warranty
…………………………………
3
Parts List
………………………………..
4
Assembly Drawing/Parts Location .... 4
9025 Marshall Road
•
Cranberry Township, PA 16066 USA
Telephone (724) 776-1020
•
Fax (724) 776-1254
Manual Number 251-252-IOM-022720 Rev A 10-5-20
