CALEFFI 142241A Руководство
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Печатать страницуVariable Orifice Balancing Valve
© Copyright 2018 Caleffi
Function
Caleffi 142 series low lead manual balancing valves are used to measure and adjust
the fluid flow rate in hydronic or plumbing circuits. Characterized flow plug which
provides precise system balancing valves and highly accurate flow compared to
other setters with ball valve control. Turning the knob moves a plug within the fluid
stream which varies the flow rate. The flow rate is determined according to the
pressure drop value measured by a differential pressure meter connected to the
pressure test ports, included. The flow rate is directly determined from the pressure
differential created across the two test ports as fluid passes the adjustment plug. The
valve design is variable orifice with pressure ports located upstream and downstream
of the adjustment plug. Compared to fixed orifice designs where both test ports are
located upstream of the adjustment plug, for a given size and flow rate, the variable
orifice design produces a greater differential pressure value. In very low flow rate
applications and with good fluid quality, this larger differential pressure signal can
result in more accurate balancing. A memory stop feature allows the valve to be
closed, and later reopened to the original set position. Insulation shells are available,
purchase separately.
Product Range
142
Technical
Material:
Specifications
Performance
Suitable fluids:
Max. percentage of glycol:
Maximum working pressure:
Working temperature range:
Accuracy:
Number of adjustment turns:
Number of regulating positions:
Connections:
Technical
specifications
Material:
of insulation
Thickness:
Density:
Thermal conductivity (ISO 2581):
Working temperature range:
142241A
1/2" NPT Female
142251A
3/4" NPT Female
142261A
1" NPT Female
142271A 1
142281A 1
142291A
2" NPT Female
Body:
Bonnet:
Control stem:
Hydraulic seals:
Knob:
Pressure test ports:
NSF/ANSI 372-2011, Drinking Water System Components-Lead Content
Reduction of Lead in Drinking Water Act, California Health and Safety Code
116875 S.3874, Reduction in Drinking Water Act, certified by ICC-ES, file
PMG-1360.
Main:
Valve body pressure test ports:
- at 50°F (10°C): 0.257 BTU·in/hr·ft
1
www.caleffi.com
Cv
3.4
5.0
7.5
12.9
1/4" NPT Female
16.8
1/2" NPT Female
22.0
DZR low-lead brass body, EPDM seal elements
Water and glycol solutions
18204.02
Insulation code:
CBN142241A
CBN142251A
CBN142261A
CBN142271A
CBN142281A
DZR low-lead brass
DZR low-lead brass
DZR low-lead brass
peroxide-cured EPDM
PA6G30
50%
232 psi (16 bar)
14–250°F (-10–120°C)
±15%
4
8
1/2"–2" NPT female
1/4" NPT female
EPP
½ inch (15 mm)
2.8 lb/ft
3
(45 kg/m
)
3
2
·°F (0.037 W/(m·K))
23 - 250°F (-5 - 120°C)