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GUIDE SPECIFICATIONS
23 00 00 HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC)
23 09 00 Instrumentation and Control for HVAC
23 09 13 Instrumentation and Control Devices for HVAC
23 09 13.33 Control Valves
Flanged Butterfly Valves and Actuators
Mounting and Wiring
1. Valves shall be cast iron with ANSI/ASME 125 flange fittings from 2 to 20 inches (DN50 to DN500). Valve body shall be coated with
polymer resin for corrosion protection.
2. Valves shall provide equal percentage flow control characteristics up to 60° disk rotation.
3. Valve disk construction shall be Nylon 11-coated cast iron. Valve seat shall be peroxide-cured EPDM combination seat and flange
gasket. Valve stem shall be blow-out proof stainless steel.
4. Three-way valve assemblies with cast iron pipe T's shall be used for mixing or diverting control and provide either A-B-AB or A-AB-B
port orientations in a "T" pattern with side port.
5. Valve bodies shall have maximum static pressure rating of 250 psig (1700 kPa) at 250°F (120 C).
6. Actuators shall be direct coupled rotary type requiring neither crank-arm nor linkage with 2-way valve bodies, and direct mount to the
valve actuator bracket. The bracket shall provide for up to 2 inches (50 mm) of pipe insulation.
7. Actuators shall provide internal wiring terminal connections with threaded holes for flexible conduit strain relief fittings for line voltage
wiring or where mechanical protection is required by local codes.
8. Valve actuator shall be capable of operating on 24 Vac Class II power (Safety Extra-Low Voltage), or be UL Recognized or CSA Certified
to U.S. and Canadian Standards for use with line voltage.
Control
1. Electric actuators shall provide two-position, floating, or modulating control. Modulating control refers to direct acceptance of 2-10 Vdc
or, with addition of a 500 ohm resistor, a 4-20 mA input signal. Floating control refers to direct acceptance of 24 or 120 Vac pulse-width
modulated open and close commands from a tri-state (SP3T) controller. Two-position control of non-fail safe actuators shall be in the
form of 24 or 120 Vac power controlled by SPDT switch. Two-position control of fail safe actuators shall be in the form of 24 or 120 Vac
power controlled by SPST switch.
2. High pressure pneumatic actuators shall be rack-and-pinion design, with or without spring return and provide two-position or
proportional control by means of air pressure, electric solenoids, pneumatic positioner, or electro-pneumatic servo controllers.
3. Industrial grade direct-drive actuators shall have polymer-coated, water-tight enclosures rated NEMA 4.
4. Modulating actuators shall provide a 2-10 Vdc feedback signal.
5. Proportional non-industrial grade actuators shall have a rotation direction control switch accessible on the cover to change between
proportional or floating control.
6. Actuators shall have SPST or SPDT auxiliary switch for position verification as an available option.
7. Actuation will be available with fail-safe operation.
Other
1. Valves may not be installed with stems below the horizontal plane to prevent actuator damage due to stem seal leakage, or accumulation
of particulate in the stem packing.
2. A water filtration and treatment system shall be installed and operated according to the requirements of Division 23 25 13, Water
Treatment for Closed-Loop Hydronic Systems. The presence of excess rust in the system will void the manufacturer's warranty.
3. Under-cut disks shall provide 50 psid (345 kPa) close-off. Full cut disks shall provide 150 psid (1034 kPa) minimum close-off. Seat
leakage when closed shall be ANSI/ASME Class IV, maximum 0.01%.
4. All spring return actuators must be designed for either normally open or normally closed fail-safe operation with a continuously engaged
mechanical return spring. This spring must return the actuator to a fail-safe position within 20-25 seconds of power loss.
5. Run time shall be constant and independent of: load, temperature, and supply voltage (within specifications).
6. All valves and actuators shall be manufactured under ISO 9001 International Quality Control Standards.
Guide Specifications
Flanged Butterfly Valves and Actuators