Download Arlington Public Schools ADDENDUM ADDENDUM # 2 DATE

TAYLOR ELEMENTARY SCHOOL
HVAC RENOVATION
ADDENDUM #2 - NOVEMBER 11, 2011
3111.003.00
b. Actuator stem shall be removable/replaceable without removing valve from line.
c. Manufacturer shall be able to provide ball insert to limit flow to maximum flow rate
with ±5% accuracy.
d. Valve shall have EPDM O-rings behind the seals to allow for a minimum close-off
pressure of 100 psi with 35 in-lbs of torque for 1/2" – 2" sizes.
e. Actuator shall provide minimum torque required for full valve shutoff position.
11. Isolation Ball Valve
1a. Valve shall include a 600 WOG manual isolation ball valve
12. Pressure Independent Control Valves and Pressure Dependent Control Valves shall be by
Belimo Controls or pre-approved equal.
13. The control valve actuator may be furnished by the ATC contractor. The controls
contractor is responsible for wiring and testing the valve actuators.
14. All components shall be warranted by manufacturer for no less than one year from date of
purchase.
U.
Calibrated Balance Valves (geothermal circuits) – Circuit Setter Plus, Bell and Gossett or
approved equal.
V.
This is a composite list of valves; all types may not be used on this project.
PART 3 - EXECUTION
3.01
3.02
INSTALLATION
A.
Install valves where required for proper operation of piping and equipment, including valves in
branch lines where necessary to isolate sections of piping. Locate valves so as to be accessible
and so that separate support can be provided when necessary.
B.
Install valves with stems pointed up, in the vertical position where possible, but in no case with
stems pointed downward from a horizontal plane unless unavoidable. Install valve drains with
hose-end adaptor for each valve that must be installed with stem below horizontal plane.
C.
Coordinate with control specifications sections 230900 and 230993.
GEAR OPERATIONS
A.
3.03
Provide gear operations on all valves in six inch pipes or over.
CHAIN OPERATORS
A.
Where noted or required for inaccessible overhead valves and valves over 8 feet above floor
(except above finished ceilings), furnish chain operated handwheels, including rustproof chain
and chain guide.
VALVES
© 2011 SHW GROUP
230523- 4
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