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SECTION 23 09 00 – BUILDING AUTOMATION SYSTEM
This is supplemental language for a spec. This is not an all inclusive spec. This is language that is
meant to be copied and pasted into an existing spec.
PART 1 - GENERAL
PART 2 - PRODUCTS
2.1
AUTOMATIC CONTROL VALVES
A.
General:
B.
Butterfly Valves
1.
All valve body connections shall be full lugged type flange connections. Wafer valves
shall not be used.
2.
Valves specified herein shall apply to cold water, glycol solutions and hot water up to
200F. This valve spec shall not apply to superheated water or steam systems.
3.
Applications
a.
Butterfly valves shall be used for 2 position isolation.
b.
Butterfly valves shall not be used for modulation control of closed water systems,
for coils, or for heat exchanger control.
c.
Butterfly valves can be used for temperature control bypass on open cooling
towers.
d.
Butterfly valves can be used for temperature control of water injection into
secondary water systems.
e.
For valves that switchover between heating and cooling supply, see requirements
for actuator speed under actuator specification.
4.
Butterfly valves shall have body ratings in accordance with the piping specifications.
a.
Design body pressure shall be determined by the adding the static pressure due to
the height of the system plus the compression tank charge plus the maximum head
of the system pump at cut off. Provide 10% design factor.
b.
Valves that are in high static locations or where flanges are ANSI300 per the
piping design shall be high performance, ANSI 300 as required by pipe
specifications.
c.
Valves that are in locations where ANSI150 flanges are allowed shall be ANSI 150
valves.
d.
Undercut discs shall only be used on systems where the maximum pump total head
pressure is below 50psi. Otherwise, the valve seats shall be bubble tight at a
pressure higher than the maximum pump total head pressure. Maximum total
pump head shall be taken from the pump curve at full speed and 0 flow.
e.
Bubble tight rating shall apply when the system is under operation and at full
pressure. Bubble tight rating shall also apply when the system is not operating and
under low or no pressure. Valves that require system pressure to remain bubble
tight are not acceptable.
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f.
5.
6.
7.
C.
Disc edge and hub on metal discs shall be spherically machined and hand polished
for minimum torque and maximum sealing capability.
g.
The seat shall totally encapsulate the body isolating it from the line media and no
flange gaskets shall be required.
Materials for ANSI 125 Bubble tight Resilient Seat Valves 2” to 12”
a.
Materials that vary from what is specified herein shall be evaluated by the
Engineer.
b.
Stem 416 stainless steel
c.
Body Cast iron
d.
Packing NBR
e.
Stem Bearing Bronze
f.
Disc 304 Stainless steel
g.
Seat EPDM
Materials for ANSI 125 Undercut Resilient Seat Valve 4” to 20” and Bubble tight valves
14” to 20”
a.
Materials that vary from what is specified herein shall be evaluated by the
Engineer.
b.
Stem 316 stainless steel or 18-8 stainless steel
c.
Body Cast iron
d.
Packing NBR
e.
Stem Bearing Sintered Metal
f.
Disc Aluminum bronze
g.
Seat EPDM
Materials for ANSI 300 High Performance Valves 2” to 12”
a.
Materials that vary from what is specified herein shall be evaluated by the
Engineer.
b.
Stem 17-4 PH stainless steel
c.
Body Carbon steel or stainless steel
d.
Packing PTFE or Graphite
e.
Stem Bearing 316 stainless steel, PTFE Bronze, or PTFE Bronze
f.
Disc 316 Stainless steel or Monel (corrosive media)
g.
Seat RTFE or Monel (corrosive media)
Butterfly Valve Actuators - Electric
1.
Provide 120V or 24V powered actuators. Actuators shall be UL and CSA listed.
2.
Actuator shall be fully modulating, floating, or two position, and/or spring return as
indicated in the control sequences.
3.
Where called for in the sequences of operations, provide a fail to a position actuators.
a.
Power Fail
1)
Valves up to 4” provide spring return power fail actuators
2)
Valves 5” to 20” provide battery or capacitor driven fail-to-position option
b.
System fail bias position with power
1)
For valves up to 4” the control signal shall determine the fail bias position
2)
For valves above 4”, the control signal shall determine the fail bias position.
If the control signal is lost, the actuator shall have a signal fail bias position.
4.
Modulating valves shall be positive positioning, responding to a 0-10VDC or 4-20mA
signal. There shall be a visual valve position indicator.
5.
For all modulating valves provide a 0-100% position feedback signal.
6.
For all 2 position valves provide a 0-100% position feedback or open and closed status
end switches.
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7.
8.
9.
10.
11.
12.
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Actuator shall provide minimum torque required for proper valve close-off. The actuator
shall be designed with a current limiting motor protection. A release button (clutch) or
handle on the actuator shall be provided to allow for manual override (except when
actuator is spring return type).
Valve rotation speed:
a.
In applications where the speed of the valve rotation matters, the controls
contractor shall provide a means to adjust the valve rotation speed during setup and
commissioning.
b.
Applications where adjustable valve rotation is required are:
1)
Switchover valves for 2- pipe heating and cooling systems
2)
Chiller condenser water isolation valves
3)
As called for in the sequences of operations
c.
Where needed, the valve rotation speed shall be adjustable in the controller
program or set at the actuator electronic board. If the speed is adjustable at the
controller, then the valve signal shall be a modulating signal and not a drive
open/drive closed signal.
Provide waterproof enclosure and crankcase heater for actuator and accessories mounted
outside.
The controls contractor shall provide wiring as follows:
a.
All line voltage power for electric valve actuators shall be wired by the controls
contractor from the nearest available power panel. Coordinate with electrical
trade.
b.
All low voltage wiring between the controller and the valve actuator shall be wired
by the controls contractor.
c.
All wiring between safeties and the valve actuator shall be wired by the controls
contractor.
d.
All wiring shall comply with local code requirements.
e.
Total valve power draw on a circuit shall not exceed 75% of the total rated circuit
at the power source. For example on a 20A circuit, valves shall not exceed 15A
draw.
f.
Total valve low voltage power on a circuit shall not exceed 75% of the
transformer VA it is connected to. For example on a 100VA transformer, valves
shall not exceed 75VA draw.
g.
Segregate non-class 2 and class 2 low voltage wiring in separate conduits. Class 2
wiring shall not exceed 100VA draw. Connections to transformers with greater
than 100VA draw shall be run in separate conduits from low voltage control signal
wiring.
h.
Segregate the Fire Alarm (FACS) and BAS controls wiring.
Provide high performance or industrial actuators on all butterfly valves. Commercial
grade, direct-mount rotary style (or direct mount damper style) actuators shall only be
allowed if approved by the Engineer or allowed in these specifications and meets the
torque performance.
High performance or industrial actuators shall have the following features:
a.
Wiring terminals in a separate compartment from the valve electronics
b.
Nema 4 enclosures. (Provide Nema 4x or 6 in locations that require those
specifications.)
c.
Adjustable torque settings at the actuator.
d.
Manual override always engaged – no clutching necessary.
e.
Anti-rust and anti-corrosive cover with anodized epoxy coating.
f.
Visual mechanical position indicator.
g.
Direct mount on valve stem – no linkages
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h.
i.
j.
k.
l.
Permanently lubricated self-locking gear train eliminating the need for motor
brakes.
Mechanical travel stops to prevent over turning during automatic or manual wheel
operation.
Over temperature motor protection.
Speed control on open and close rotations.
Operating temperature range: -40F to 140F
Specifier: Choose to allow this option or not
13.
Project Name
Date
Commercial direct mount rotary actuators
a.
Brushless motors, microprocessor controlled, for longer life. Brushed motors not
allowed because of wear and erosion.
b.
Reinforced nylon gears occluding with steel or die cast aluminum gears on metal
pinion.
c.
Electronic overload or stall protection in both directions.
d.
Adjustable mechanical range of rotation shall be adjustable between 90deg and
45deg. The control signal shall self-adapt such that the 0-10Vdc control signal is
scaled within the adjusted mechanical range.
e.
Self-centering jaw clamp connection of actuator drive to valve stem. Non-selfcentering clamps and set screws are not allowed.
f.
Nema 1 enclosure.
g.
Approvals: UL873, UL60730,
h.
Compliant with RoHS (Restriction of the use of Certain Hazardous Substances
compliant - cadmium, lead, and mercury free.)
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