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Installation and Maintenance of Gate Valves in St. Paul
Author(s) -
Hoher Roy W.
Publication year - 1960
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1960.tb00474.x
Subject(s) - gate valve , engineering , precast concrete , mechanical engineering , structural engineering
This article discusses the gate valves and control appurtenances used in St. Paul, Minnesota's distribution system. For several years, St. Paul has used the AWWA type of valve with the nonrising stem. The gates have iron bodies with double disk, bronze, mounted parallel seats, and open to the right. The only exception to the AWWA standard is the greater tensile strength (80,000 psi) required in the valve stem. In other words, St. Paul requires the same stem strength for valves less than 30 inches as AWWA requires for larger gates. The city's present policy is to use the vertical type of gate valve with a cast‐iron gate box for 16‐inch and smaller size valves; for gates 20 inches and larger, the horizontal type of valve with a bypass is used. For this type of installation, a precast concrete manhole is set around the gate mechanism, and a cast‐iron gate box is used for the bypass valve.