[_____] differential through the valve at rated flow, except as indicated
otherwise. Select valve flow coefficient (Cv) for an actual pressure drop
not less than 50 percent or greater than 125 percent of the design pressure
drop at design flow.
Valves 100 mm 4 inches and larger shall be butterfly
valves.
2.3.7
Valves for Hot Water Service
Valves for hot water service below 121 degrees C 250 Degrees F shall
conform to ASME B16.1. Bodies for valves 50 mm 2 inches and smaller shall
be brass or bronze, with threaded-end or union-end connections. Bodies for
valves 65 mm 2.5 inches and larger shall be cast iron. Bodies for 65 mm
2.5 inches and larger shall have flanged-end connections. Water valves
shall be sized for a [21 kPa] [3 psi] [_____] differential through the
valve at rated flow, except as indicated otherwise. Select valve flow
coefficient (Cv) for an actual pressure drop not less than 50 percent or
greater than 125 percent of the design pressure drop at design flow.
Internal trim, including seats, seat rings, modulating plugs, and springs,
of valves controlling water hotter than 99 degrees C 210 degrees F shall be
Type 316 stainless steel. Internal trim for valves controlling water 99
degrees C 210 degrees F or less shall be brass or bronze. Non-metallic
parts of hot water control valves shall be suitable for a minimum
continuous operating temperature of 121 degrees C or 10 degrees C 250
degrees F or 50 degrees F above the system design temperature, whichever is
higher. Valves 100 mm 4 inches and larger shall be butterfly valves.
2.3.8
Valves for Steam Service
ASME B16.1. Bodies for valves 40 mm 1.5 inches and smaller shall be brass
or bronze, with threaded or union ends. Bodies for valves 50 to 80 mm 2 to
3 inches inclusive shall be brass, bronze, or cast iron. Bodies for valves
100 mm 4 inches and larger shall be cast iron. Bodies for 50 mm 2 inch
valves shall have threaded ends. Bodies for valves 65 mm 2.5 inches and
larger shall be provided with flanged-end connections. Internal valve trim
shall be Type 316 stainless steel. Steam valves shall be sized for [103
kPa (gage)] [15 psig] [_____] inlet steam pressure with a maximum [90 kPa]
[13 psi] [_____] differential through the valve at rated flow, except as
indicated otherwise.
2.3.9
Valves for High Temperature Hot Water Service
Valves for high temperature hot water service above 121 degrees C 250
degrees F. Valve bodies shall conform to ASME B16.34 Class 300. Valve and
actuator combination shall be normally closed. Bodies shall be carbon
steel, globe type with welded ends on valves 25 mm one inch and larger.
Valves smaller than 25 mm one inch shall have socket-weld ends. Packing
shall be virgin polytetrafluoroethylene (PTFE). Internal valve trim shall
be Type 316 stainless steel. Water valves shall be sized for a [21 kPa] [3
psi] [_____] differential pressure through the valve at rated flow, except
as indicated otherwise. Select valve flow coefficient (Cv) for an actual
pressure drop not less than 50 percent or greater than 125 percent of the
design pressure drop at design flow.
2.3.10
Valves for Compressed Air Service
Valves used for switching compressed air supplied to pneumatic systems
shall be brass body, three-way valves which shall conform to ASME B16.15
Class 250.
SECTION 15901N
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