Tritherm 2 Port Motorised Valve 28mm
£37.72 excl VAT
- Reliable 230V 2-port zone valve for central heating and UFH zoning.
- Features spring-return action, manual filling lever, and integrated auxiliary switch.
- Max static pressure 8.6 bar.
Tritherm 2-Port Motorised Zone Valve
The Tritherm 2-Port Motorised Zone Valve is designed to control the flow of water in iron and copper pipe systems. While specifically engineered for small bore domestic central heating systems, its robust design also makes it suitable for commercial and industrial applications.
Key Product Features
| Feature | Detail | Benefit |
| Manual Control | Integrated Manual Lever |
Allows the valve to be locked in ‘MAN OPEN’ position for easy system draining and filling3.
|
| Efficiency | 6W Power Consumption |
Low energy usage during operation4.
|
| Fail-Safe | Spring Return Mechanism |
Automatically closes the valve (within 6 seconds) when power is cut5.
|
| Switching | SPST Auxiliary Switch |
Integrated 2.2A switch to control pump or boiler operation6.
|
| Durability | 8.6 Bar Static Pressure |
Suitable for high-pressure systems7.
|
| Installation | Flexible Mounting |
Can be plumbed at any angle (except upside down)8. |
Application and Installation
This valve is an essential component for S-Plan heating systems and underfloor heating manifolds, allowing for precise zoning of heating and hot water.
- Orientation: The valve may be plumbed at any angle, provided the valve head is not below the horizontal level of the pipework, preventing safety hazards in case of leaks.
- Safety: The manual lever is designed for filling and draining purposes only and should normally be left in the ‘AUTO’ position.
- Fitting: Includes standard compression fittings. Always use a spanner ( or ) on the valve body ports while tightening nuts—never grip the valve head.
Technical Specifications
| Detail | Specification |
| Power Supply |
230 Volts AC, 50Hz 12
|
| Switch Rating |
2.2A 13
|
| Switch Type |
SPST (Single Pole Single Throw) 14
|
| Power Consumption |
6W 15
|
| Opening Time |
12 seconds (under power) 16
|
| Closing Time |
6 seconds (under spring return) 17
|
| Max Ambient Temp |
$50^{\circ}\text{C}$ 18
|
| Flow Temp Range |
$5^{\circ}\text{C}$ to $88^{\circ}\text{C}$ 19
|
| Max Static Pressure |
8.6 bar 20 |
Flow Characteristics
The valve is designed for efficient flow with minimal pressure drop. The table below approximates the flow rates based on the provided performance curves for different valve sizes (Kv values).
Flow Rate vs. Pressure Drop
| Pressure Drop (mwc) | Flow Rate (l/min) – Kv 3.0 | Flow Rate (l/min) – Kv 6.9 | Flow Rate (l/min) – Kv 8.6 |
| 1.0 | ~12 | ~35 | ~45 |
| 2.0 | ~18 | ~50 | ~65 |
| 3.0 | ~25 | ~60 | ~80 |
| 4.0 | ~30 | ~70 | ~90 |
| 5.0 | ~35 | ~80 | ~100 |
(Data derived from Flow Characteristics chart)
Dimensions & Wiring
Dimensions
- 22mm Valve: Length (D) = 112mm.
- 28mm Valve: Length (D) = 127mm.
- Clearance: Requires vertical clearance for cover removal (Dimension B: 98mm).
Wiring Connections
- Brown: Live
- Blue: Neutral (Motor)
- Orange: Auxiliary Switch (Live out to Boiler/Pump)
- Grey: Auxiliary Switch (Live in)
- Green/Yellow: Earth
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