ends.
2.3.3
MSS SP-72 for flanged or butt-welding ends or MSS SP-110 for threaded,
socket-welding, solder joint, grooved and flanged ends.
2.3.4
Balancing Cocks, Flow Rate Control and Meter
Bronze, solder, threaded, or flanged ends. Provide square head, flow
indicator arc or check pressure ports for differential flow metering
device. Provide valve construction with rating of 116 degrees C at 862 kPa
240 degrees F at 125 psi.
2.3.5
Check Valves
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NOTE: When thermal siphon is a problem, use only
spring-loaded check valves with elastomer seals.
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MSS SP-80, bronze, Class 150; [Type 3, swing check, metal disc to metal
seat] [or] [Type 4, swing check, non-metallic disc to metal seat]. [Provide
spring-loaded construction with elastomer seals.]
2.3.6
Water Pressure-Reducing Valves
ASSE 1003 with ASSE seal, self contained, direct acting, and single seat
diaphragm.
2.3.7
Control Valves
UL listed. Provide valves actuated by electric motors. Construct valves
to permit replacing valve seals without draining the system. Provide
bronze body construction and stainless steel valve stems, with rating of 4
to 166 degrees C at 862 kPa 40 to 240 degrees F at 125 psi. Include
external position indicators and steel enclosures to protect operating
components.
2.3.7.1
Shutoff and Diverting Control Valves
Bronze valves with 100 percent shutoff, stainless steel butterfly or ball,
and elastomer seats and seals.
2.3.7.2
Non-Shutoff Mixing Valves
MSS SP-25 marking modulating, [bronze] [or] [brass] body construction,
stainless steel valve stems, and thermostatically controlled.
2.3.7.3
Valve Operators
Provide electric [two-position] [or] [proportioning] operators, with
oil-immersed gear trains. Two-position operators may be single-direction
with [spring-return] [or] [reversing] construction. [For [reversing] [and]
[proportioning] operators, provide limit switches to limit the lever in
either direction unless the operator is the stalling type.] Operators
shall function properly with a 10 percent plus or minus change in the line
voltage feeding the equipment. Totally enclose operators and gear trains
in dustproof housings of pressed steel or metal castings with rigid conduit
SECTION 13610N
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