Materials Section - City of Xenia

7.0 Tapping Sleeves, Valves and Check Valves
7.1 Tapping Sleeves - Tapping sleeves and tapping machine valves of the size specified should
be installed by the contractor at the locations shown on the construction drawings or set by the
City Engineer or his Representative. The tapping sleeve shall be field approved by the city
representative prior tap being made. When it is necessary to cut into an existing water main under
pressure the tapping sleeve shall be of the mechanical joint or stainless steel type. It shall be
installed in such a manner as to provide a watertight joint with both sections of the sleeve and the
existing water main. The sleeve shall be installed so that the axis of the center of the valve
opening is level. (Tapping sleeves shall be mechanical joint or stainless steel type.)
7.2 Pressure Testing Tapping Sleeve - Tapping sleeves shall be hydrostatically pressure tested
as follows:
Domestic main installation - 150 PSI for 15 minutes
Fire line installation - 200 PSI for 15 minutes
The contractor shall use a suitable large drilling machine to make the cut into the existing water
main under pressure. The section of pipe shall be removed and given to the City Representative.
A City representative must be present during tapping sleeve pressure test and water main
taps.
The sleeve and valve shall meet all of the requirements of these specifications and will be field
approved by the City Engineer or Engineer’s Representative and shall be AWWA approved.
ALL VALVES SHALL OPEN RIGHT (CLOCKWISE).
7.3 Check Valves - Check valves shall be cast iron body, horizontal swing type, fully bronze
mounted with a bronze gate, and set rings machined to a watertight surface. The gate shall hang
from a stainless steel shaft with a heavy, solid, bronze hinge. The gate shall be assembled in
such a manner as to prevent gate rotation, distribute the seat wear, and assure alignment of the
gate with the body seat. The check valve body design shall obtain full, nominal pipe diameter
with the valve clapper clear of the waterway in the open position. Check valves shall conform to
“Swing-Check Valves for Waterworks Service, 2-inch through 24-inch NPS”, AWWA C508.
Check valves shall be supplied with removable covers or hand hole plates for inspection and
maintenance without removing the valve body from the line.
Underwriters Laboratories, Inc. check valves, if specified on the construction drawings and/or
proposal sheets, shall be provided with two bosses on each side, two bosses on the bottom, and
10 February 2007