The Caleffi 142241A is a 142 series manual balancing valve with a variable orifice, 1/2" NPT female connections, and integral pressure test ports. Constructed of DZR low-lead brass and certified to NSF/ANSI/CAN 372 (ICC-ES file PMG-1360), it sets circuit flow in hydronic and plumbing systems: flow is determined from the differential pressure at the test ports and the Cv value for the current knob position.
Four full turns of adjustment give control from fully closed to a maximum Cv of 3.4, and the graduated knob position is read directly for repeatable settings.
Best For
- Proportional balancing of hydronic heating and chilled water circuits
- Cost-focused projects balancing many small branch circuits
- Potable water applications requiring certified low-lead components
- Systems commissioned with differential pressure meters at the test ports
Key Features
Variable Orifice Design
The valve plug itself throttles flow; the position-specific Cv chart converts a differential pressure reading into flow at any of the graduated settings.
Integral PT Ports
Built-in pressure test ports with EPDM seal elements accept standard differential pressure meter probes without added fittings.
4-Turn Graduated Adjustment
Four full turns with a graduated position indicator give repeatable settings across the full Cv range.
Compact Low-Lead Construction
DZR low-lead brass body, bonnet, and adjustment plug in a compact pattern that fits tight branch piping.
Certified Low Lead
Meets NSF/ANSI/CAN 372, certified by ICC-ES under file PMG-1360 for potable water use.
Technical Specifications
| Series | 142 Variable Orifice |
| Orifice Type | Variable |
| Connection | 1/2" NPT female |
| Max Cv (Fully Open) | 3.4 |
| Adjustment | 4 turns, graduated knob |
| Accuracy | ±15% |
| Max Working Pressure | 232 psi (16 bar) |
| Working Temperature Range | 15 to 250°F (-10 to 120°C) |
| Suitable Fluids | Water, glycol solutions (max 50% glycol) |
| Body, Bonnet, Adjustment Plug | DZR low-lead brass |
| Adjustment Knob | PA6G30 |
| Hydraulic Seals | EPDM |
| Pressure Test Ports | DZR low-lead brass body, EPDM seal elements |
| Certifications | NSF/ANSI/CAN 372, ICC-ES file PMG-1360 |
Documentation
Technical Datasheet 01250/23 NA - 142 Series Variable Orifice- Installation and Operation Instructions 18204
- ICC-ES PMG-1360 Low-Lead Product Certificate
Design Resources
Related Products
- Caleffi 130400A – 1/2" Flo-Set fixed orifice alternative (constant measurement Cv)
- Caleffi NA10824 – 1/2" FNPT isolation full-port ball valve for service isolation
Frequently Asked Questions
What is the difference between the Caleffi 142241A and a fixed orifice balancing valve?
The 142241A throttles and measures through the same variable orifice, so the measurement Cv changes with knob position and is read from the position chart. A fixed orifice valve like the 130400A keeps its measurement Cv constant at every setting. The variable orifice design is more compact and economical; the fixed orifice design is faster to read in the field.
What is the maximum Cv of the Caleffi 142241A?
3.4 with the knob fully open after 4 turns.
Is the Caleffi 142241A approved for potable water?
Yes. The DZR low-lead brass construction meets NSF/ANSI/CAN 372 and is certified by ICC-ES under file PMG-1360.
How accurate is flow measurement on the Caleffi 142241A?
Flow determined from the PT port differential pressure and the position Cv chart is accurate to within ±15%.
What is the warranty on the Caleffi 142241A?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship. ZOT Supply is an authorized Caleffi distributor.
- Type:
- Static
- Series:
- 142 Variable Orifice
- Flow Capacity (Cv):
- 3.4
- Temperature Gauge:
- No
- Connection Type:
- FNPT
- Connection Size:
- 1/2 Inch
