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Technical

specifications

of insulation

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.

Material:

Body: DZR low-lead brass

Bonnet: DZR low-lead brass

Control stem: DZR low-lead brass

Hydraulic seals: EPDM

Knob: PA6G30

Pressure test ports: DZR low-lead brass body, EPDM seal elements

Reduction of Lead in Drinking Water Act Compliant: 0.25% Max. weighted

average lead content. Reduction of Lead in Drinking Water Act Certified by

IAPMO R&T.

Suitable fluids: Water and glycol solutions

Max. percentage of glycol: 50%

Maximum working pressure: 232 psi (16 bar)

Working temperature range: 14–250°F (-10–120°C)

Accuracy: ±15%

Number of adjustment turns: 4

Number of regulating positions

: 8

Connections: Main: 1/2”–2” NPT female

Valve body pressure test ports: 1/4“ NPT female

Material: EPP

Thickness: ½ inch (15 mm)

Density: 2.8 lb/ft

(45 kg/m

)

Thermal conductivity (ISO 2581):

- at 50°F (10°C): 0.257 BTU·in/hr·ft

·°F (0.037 W/(m·K))

Working t

emperature range: 23 - 250°F (-5 - 120°C)

Reaction to fire (UL 94): Class HBF

Variable Orifice Balancing Valve

18204

www.caleffi.com

142241A 1/2” NPT Female

142251A 3/4” NPT Female

142261A 1” NPT Female

142271A 1 1/4” NPT Female

142281A 1 1/2” NPT Female

142291A 2” NPT Female

Insulation code:

CBN142241A

CBN142251A

CBN142261A

CBN142271A

CBN142281A

142

3.4

5.0

7.5

12.9

16.8

22.0

Summary of content (6 pages)

PAGE 1
8204 www.caleffi.com Variable Orifice Balancing Valve © Copyright 2015 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.
PAGE 2
SAFETY INSTRUCTION This safety alert symbol will be used in this manual to draw attention to safety related instructions. When used, the safety alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN A SAFETY HAZARD. CAUTION: All work must be performed by qualified personnel trained in the proper application, installation, and maintenance of systems in accordance with all applicable codes and ordinances.
PAGE 3
Operating Principle The 142 series balancing valve is a hydraulic device that controls the flow rate of a fluid. 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. The opening position is indicated by the numbered indicator (fig.
PAGE 4
Memory Stop on the 142 series balancing valve Once you have balanced the flow rate, insert a 2.5 mm hexagonal key into the hole (5) in the balancing valve and fully turn it clockwise without forcing it. This sets the valve’s maximum stroke position: if necessary, it is possible to shut off the balancing valve in the circuit by turning the knob fully clockwise manually. To restore the valve to its preset position, turn the adjustment knob fully counterclockwise (fig. L).
PAGE 5
18203 142241A 142251A 142261A 142271A 142281A 142291A 1/2” NPT Female 3/4” NPT Female 1” NPT Female 1 1/4” NPT Female 1 1/2” NPT Female 2” NPT Female www.caleffi.com © Copyright 2015 Caleffi Code 142241A 1/2” Δp (feet of head) Position 0.5 1 Code 142251A 3/4” (psi) 2 2.5 3 3.5 4 1 .5 (bar) 20 46.00 Dp (feet of head) Position 0.5 1 1 .5 2 (psi) 2.5 3 3.5 4 1.0 10 0.2 2 0.1 1 0.01 0.1 2.5 3 3.5 4 2.13 2.9 3.3 3.4 Cv 0.0006 2 00 0.0004 0.00035 5.6 7.0 12.
PAGE 6
142241A 142251A 142261A 142271A 142281A 142291A 1/2” NPT Female 3/4” NPT Female 1” NPT Female 1 1/4” NPT Female 1 1/2” NPT Female 2” NPT Female www.caleffi.com © Copyright 2015 Caleffi Code 142291A 2” Code 142281A 1 1/2” Dp (feet of head) Position 1 0.5 (psi) 1 .5 2 2.5 3 3.5 4 (bar) 20 46.00 ∆p (feet of head) Position (psi) 1 1 .5 2 2.5 3 3.5 4 0.5 1.0 1.0 0.015 0.0115 Cv Max Position Size 1 1/2" 0.5 1 1.5 2 2.5 3 3.5 4 Cv 2.0 3.3 5.6 8.1 10.9 13.4 14.9 16.8 2 00 0.