Honeywell MS4103 manual Guide Specifications, Threaded Globe Valves, 170

Guide Specifications

Threaded Globe Valves

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

Threaded Globe Valves

Mounting

1.Two-way threaded globe valves shall be red brass with female national pipe thread fittings in sizes from ½ up to 3 inches (DN15 to DN80). Three-way valves shall be up to 2 inches (DN50).

2.Valves sized ½ inch (DN15) shall be available in multiple Cv ratings. Cv ratings shall be a geometric progression.

3.Valves shall offer equal percentage control characteristic on the A port. Valves rated for high pressure steam shall have linear control characteristic.

4.Two-way, direct acting valves up to 2 inches (DN50) shall have stainless steel seats. Valves rated for high pressure steam shall have stainless steel plug.

5.Two-way, direct acting valves 2 ½ to 3 inches shall have Teflon or carbon-loaded Teflon discs for water or steam service and brass seats.

6.Three-way and reverse-acting two way valves shall be constructed with brass plugs and seats.

7.Three-way valves shall feature A-B-AB porting for mixing control. Flow capacity of the B port shall have a linear flow characteristic and be reduced 20% to approximate constant loop flow in coil-bypass applications.

8.Bronze valves bodies shall have static pressure ratings ANSI/ASME Class 150, maximum temperature 337°F (169 C).

9.Valve stroke shall be ¾ inch (20 mm) for precise control.

10.Undercut bonnet of 1 3/8 inch (35 mm) diameter shall allow linkage or direct-coupled actuator attachment by U-bolt, twin set screws, or mating clamp.

11.Valves shall carry Canadian Registration Numbers.

Control

1.Actuation shall be electric or pneumatic. Actuators may be direct-coupled linear operators, or rotary actuators attached by means of a linkage. A dual tandem linkage for rotary actuators will provide enhanced close-off ratings.

2.Electric actuators shall provide two-position, floating, or proportional control. Proportional control refers to direct acceptance of 0-10 Vdc, 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 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 Vac power controlled by SPDT switch. Two-position control of fail safe actuators shall be in the form of 24 Vac power controlled by SPST switch.

3.Globe valves shall have minimum 50:1 rangeability with an equal percentage flow characteristic for water or linear flow characteristic for steam.

Other

1.Valves shall have spring-loaded, self-adjusting, Teflon® packing.

2.All valves must be field serviceable without the need to remove the valve from the piping, in order to minimize future service costs.

3.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.

4.Valves controlling steam should be installed with the actuator beside the valve, not above it.

5.Operating pressure of high pressure steam-rated valves shall not exceed 100 psig (690 kPa). Superheated steam must not exceed the temperature rating of the valve.

6.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.

7.Actuated valves shall be capable of closing off against their maximum operating differential pressure. Seat leakage when closed shall be ANSI/ASME Class III, 0.05% maximum. Seat leakage for valve with Teflon-based discs shall be 0.5% maximum.

8.Differential pressure for quiet operation shall be at least 20 psid (138 kPa).

9.All valves and actuators shall be manufactured under ISO 9001 International Quality Control Standards.

10.Valves and actuators shall be as manufactured by Honeywell.

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