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2D COMBAT ENGINEERS OPS/MAINTENANCE COMPLEX
MCB CAMP LEJEUNE, NC
12P1253
EPROJECT W.O. No.: 80511
The leakage rate of each damper when full-closed shall be no more
than 2 cfm per sq. foot of damper face area at
1.0 inches water gage static pressure.
2.3.2
Control Valves
2.3.2.1
Valve Assembly
Valve bodies shall be designed for 125 psig minimum working pressure or 150
percent of the operating pressure, whichever is greater. Valve stems shall
be Type 300 series stainless steel. Valve leakage ratings shall be 0.01
percent of rated Cv value. Class 125 copper alloy valve bodies and Class
150 steel or stainless steel valves shall meet the requirements of
ASME B16.5. Cast iron valve components shall meet the requirements of
ASTM A 126 Class B or C.
2.3.2.2
Butterfly Valves
Butterfly valves shall be the threaded lug type suitable for dead-end
service and for modulation to the fully-closed position, with stainless
steel shafts supported by bearings, non-corrosive discs geometrically
interlocked with or bolted to the shaft (no pins), and EPDM seats suitable
for temperatures from minus 20 degrees F to plus 250 degrees F. Valves
shall have a means of manual operation independent of the actuator.
2.3.2.3
Three-Way Valves
Three-way valves shall have an equal percentage characteristic.
2.3.2.4
Valves for Chilled Water, Condenser Water, and Glycol Fluid Service
a.
Bodies for valves 1-1/2 inches and smaller shall be brass or bronze,
with threaded or union ends. Bodies for valves from 2 inches to 3
inches inclusive shall be of brass, bronze, or iron. Bodies for 2 inch
valves shall have threaded connections. Bodies for valves from 2-1/2
to 3 inches shall have flanged connections.
b.
Internal valve trim shall be brass or bronze, except that valve stems
shall be stainless steel.
c.
Unless indicated otherwise, provide modulating valves sized for 2 psi
minimum and 4 psi maximum differential across the valve at the design
flow rate.
d.
Valves 4 inches and larger shall be butterfly valves, unless indicated
otherwise.
2.3.2.5
Valves for Hot Water Service
Valves for hot water service below 250 Degrees F:
a.
Bodies for valves 1-1/2 inches and smaller shall be brass or bronze,
with threaded or union ends. Bodies for valves from 2 inches to 3
inches inclusive shall be of brass, bronze, or iron. Bodies for 2 inch
valves shall have threaded connections. Bodies for valves from 2-1/2
to 3 inches shall have flanged connections.
b.
Internal trim (including seats, seat rings, modulation plugs, valve
SECTION 23 09 23.13 22
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