The Caleffi 301140 is an angled isolation valve for two-pipe panel radiators, 1/2 in male radiator connection x 3/4 in male conical pipe connection, on 50 mm centers. It carries two ball shut-off valves so the radiator can be closed off for service or removal without draining the circuit.
Best for two-pipe panel radiator installations that need the radiator isolated for service or replacement, with pipes exiting the wall.
Specifications from Caleffi datasheet 01036/23 NA (replaces 01036/12 NA). Reviewed August 2026.
Key Features
Two Ball Shut-Off Valves
Both legs close with a screwdriver, isolating the radiator for service or removal without draining the circuit.
50 mm Center Distance
The 2 in (50 mm) outlet center distance is the common standard across all brands of panel radiator, so the valve fits the bottom supply and return ports directly.
Serves the Radiator's Built-In Valve
The valve connects to the bottom ports and feeds the thermostatic valve built into the top of the panel radiator through its internal riser.
Chrome-Plated Brass Throughout
Chrome-plated brass body and control stems with peroxide-cured EPDM seals, rated 150 psi (10 bar) and 212°F (100°C).
Technical Specifications
| Product Type | Radiator Isolation Valve |
| Series | 3011 Series |
| Body Style | Angled |
| System type | Two-Pipe |
| Radiator connection | 1/2 in male straight thread |
| Pipe connection | 3/4 in male conical |
| Body material | Brass, chrome plated |
| Valve control stems | Brass, chrome plated |
| Seals | Peroxide-cured EPDM |
| Suitable fluids | Water, glycol solutions (30% max.) |
| Maximum working pressure | 150 psi (10 bar) |
| Max. working temperature | 212°F (100°C) |
| Max. differential pressure | 15 psi (1 bar) |
| Center-to-center | 2 in (50 mm) |
| Body length | 3 in |
| Radiator centerline height | 1-3/4 in |
| Depth | 2-1/4 in |
Documentation
Related Products
- Caleffi 301341 : Angled Diverter Valve, One-Pipe
- Caleffi 301241 : Straight Diverter Valve, One-Pipe
- Caleffi 449740 : Wall-Covering Plate 40-50 mm
- Caleffi 437516 : Compression Fitting 1/2" Copper
- Caleffi 681503A : PEX Fitting 3/8" Nominal
Frequently Asked Questions
What does the Caleffi 301140 do?
It is a manual isolation valve for two-pipe panel radiators. Two ball shut-off valves close the supply and return so the radiator can be serviced or removed without draining the circuit. It provides no thermostatic control.
Does the Caleffi 301140 control temperature?
No. Temperature is controlled by the thermostatic valve built into the top of the panel radiator. This valve handles the bottom connections, isolation and, on the diverter versions, flow proportioning.
What is the center distance of the Caleffi 301140?
2 in (50 mm), the common standard for panel radiator bottom connections across all brands.
What are the pressure and temperature limits of the Caleffi 301140?
Maximum working pressure is 150 psi (10 bar) and maximum working temperature is 212°F (100°C). Maximum differential pressure is 15 psi (1 bar). Suitable for water and glycol solutions to 30 percent.
- Product Type:
- Radiator Isolation Valve
- Product Family:
- Panel Radiator Valves
- Series:
- 3011 Series
- Body Style:
- Angled
- System Type:
- Two-Pipe
- Connection Type:
- Conical
- Connection Size:
- 3/4 in
- Body Material:
- Brass, Chrome Plated
- Max Operating Pressure:
- 150 psi (10 bar)
- Max Medium Temperature:
- 212 deg F (100 deg C)
