Brochure

F-27855-10256
Guide Specification Text
F-27990-4 tc 14
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affiliated companies.
3. Serviceability
a. 2-Way valve operators, stem and plug assemblies and spring-loaded
PTFE/EPDM valve stem packing cartridges must be removable for future
replacement to restore the valves back to their original condition.
4. Construction
a. Material grades must meet the fluid temperature and pressure requirement
temperatures of 20°F …281°F to assure reliability throughout all
application temperature ranges.
5. Packings
a. Shall be cartridges suitable for replacement as units withstanding the full
operating temperature ranges, including daily and seasonal fluctuations of
water, 60% glycol and steam fluids.
6. Characteristics
a. Rangeability: Two way,100:1 and greater for stable control under light load.
b. Shutoff, 2-Way: Leakage allowed: ANSI Class IV (0.01% of max flow)
c. 3-Way: Leakage allowed: ANSI Class III (0.1% of max flow)
d. Flow curves: 2-Way modified equal percentage characteristic.
e. Mixing and Diverting: Linear, modified with gradual opening for light loads.
7. Piping
a. Diverting valves, with the common port at the bottom can be used for
mixing.
b. Mixing valves with the common port at the end must not be used for
diverting applications.
8. Sizing
a. Two Position Water: Line size or size using a differential pressure of 1 psi.
b. Modulating Water: 5 PSI or twice the load pressure drop
c. Steam, 2-Way: maximum pressure drop across the valve at a maximum
flow of 80 percent of inlet pressure up to 15 psig. Above 15 psig inlet, 42%
of absolute (gage pressure + 14.7) inlet pressure.
9. Certifications for All Models
a. Pressure Equipment Directive (PED 97/23/EC), RoHS (Restriction of
Hazardous Substances) and REACH (Regulation, Evaluation,
Authorization, and Restriction of Chemicals
D. ½”…¾” Ball Valve
[Schneider Electric VBB/VBS Ball Valves]
1. Manufactured, brand labeled or distributed by Schneider Electric.
2. ½” and ¾” Ball Valves: Forged brass body rated at no less than 600 psi, chrome
plated brass ball with blowout proof stem or optional stainless steel ball with blowout
proof stem,
3. Valves are to be in 2-way and 3-way configurations.
4. Connection: Female NPT end fittings,Teflon® PTFE seat, characterizing disc glass-
filled PEEK providing equal percentage flow curve on 2-way valve.
5. Operating Temperature 20…250°F chilled or hot water with up to 60% glycol
solution.
6. 2-way and Bypass port should be ANSI Class IV (0.01% of Cv) seat leakage.
7. Rangeability must be at least 300:1.
8. Tool-less actuator connection.
9. System Static Pressure Limit should be 600 psig (4137 Pa)
Guide Specification Text
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