2.11.18.3
Check Valves
Check valves 65 mm 2-1/2 inches and smaller shall conform to MSS SP-80,
bronze, threaded, soldered, or flanged ends. Check valves 80 mm 3 inches
and larger shall conform to MSS SP-71, cast iron, bronze trim, flanged, or
threaded ends.
2.11.18.4
Angle Valves
Angle valves 65 mm 2-1/2 inches and smaller shall conform to MSS SP-80
bronze, threaded, soldered, or flanged ends. Angle valves 80 mm 3 inches
and larger shall conform to MSS SP-85, cast iron, bronze trim, flanged, or
threaded ends.
2.11.18.5
Ball valves 15 mm 1/2 inch and larger shall conform to [MSS SP-72] [or] [
MSS SP-110], ductile iron or bronze, threaded, soldered, or flanged ends.
2.11.18.6
Plug Valves
Plug valves 51 mm 2 in. and larger shall conform to MSS SP-78.
Plug valves
smaller than 51 mm 2 in. shall conform to ASME B16.34.
2.11.18.7
Grooved End Valves
**************************************************************************
NOTE: Grooved end valves will not be allowed for
steam piping.
**************************************************************************
Valves with grooved ends per AWWA C606 may be used if the valve
manufacturer certifies that their performance meets the requirements of the
standards indicated for each type of valve.
2.11.18.8
Balancing Valves
Balancing valves shall have meter connections with positive shutoff valves.
An integral pointer shall register the degree of valve opening. Valves
shall be calibrated so that flow rate can be determined when valve opening
in degrees and pressure differential across valve is known. Each balancing
valve shall be constructed with internal seals to prevent leakage and shall
be supplied with preformed insulation. Valves shall be suitable for 120
degrees C 250 degrees F temperature and working pressure of the pipe in
which installed. Valve bodies shall be provided with tapped openings and
pipe extensions with shutoff valves outside of pipe insulation. The pipe
extensions shall be provided with quick connecting hose fittings for a
portable meter to measure the pressure differential. One portable
differential meter shall be furnished. The meter suitable for the
operating pressure specified shall be complete with hoses, vent, and
shutoff valves, and carrying case. In lieu of the balancing valve with
integral metering connections, a ball valve or plug valve with a separately
installed orifice plate or venturi tube may be used for balancing.
2.11.18.9
Automatic Flow Control Valves
**************************************************************************
NOTE: In any facility where technological and
occupancy requirements indicate that load imbalances
SECTION 15569A
Page 50
Previous Page
