Description
2" WRAS Latching Brass Solenoid Valve – LPU225D-20
The LPU225D-20 is a high-flow 2" WRAS approved brass latching solenoid valve designed for large-bore potable water systems requiring ultra-low power consumption and reliable shut-off.
This 2/2 way bi-stable solenoid valve uses short electrical pulses to open and close and requires no continuous electrical power to maintain either position.
Once operated, the valve remains in its last position without power until an opposite-polarity pulse is applied.
Featuring a large 50mm orifice, Kv flow factor of 580 L/min and WRAS approved EPDM seals, the LPU225D-20 provides exceptionally high flow capacity with very low energy consumption. It is ideal for battery-powered systems, remote water isolation, smart water management and large-scale automatic water shut-off applications.
Valve Function & Operation
Function: 2/2 way latching / bi-stable
Operation: Pressure-assisted diaphragm
Minimum Operating Differential: 0.5 Bar
Unlike a conventional continuously energised solenoid valve, the LPU225D-20 requires only a short electrical pulse to change position. The valve then remains mechanically latched in its last position without further electrical power.
Latching Control Logic
Stay Closed: Negative terminal 1 / positive terminal 2
Stay Open: Positive terminal 1 / negative terminal 2
Pulse Duration: 10–20ms
Hold Power: None required
The valve remains in its last position when electrical power is removed.
Ports & Flow
Port Size: 2" BSP female
Optional Thread: NPT
Orifice Size: 50.0mm
Kv Flow Factor: 580 L/min based on water with 1 Bar pressure drop
Pressure & Performance
Operating Pressure: 0.5 to 10 Bar differential
Maximum Working Pressure: 15 Bar
Opening / Closing Time: Approximately 3 seconds
Design: Anti-water-hammer closing characteristics
Construction & Materials
Body Material: Brass
Internal Components: Stainless steel
Seal Material: WRAS approved EPDM
WRAS Approval Certificate: 2304324
Media & Temperature
Media: Potable water
Media Temperature: -5°C to +130°C
Latching Coil & Electrical Specification
Coil Type: 22003L latching / bi-stable coil
Power: 10 Watts during operating pulse only
Pulse Duration: 10–20ms
Voltage Range Options:
3–9V DC
9–15V DC
The latching design consumes electrical energy only when changing valve position, making it particularly suitable for battery-powered, solar-powered and remote water control systems.
Protection
Ingress Protection: IP65
Electrical Connector: Supplied
Why Use a Latching Solenoid Valve?
Conventional solenoid valves generally require continuous electrical power to remain energised. A latching or bi-stable solenoid valve requires only a momentary electrical pulse to change position.
Once switched, the LPU225D-20 remains in its selected position without continuous power. This significantly reduces energy consumption and makes it particularly useful where battery life, heat generation or available electrical power is limited.
Typical Applications
Large-bore potable water systems
Battery-powered water control
Smart water shut-off systems
Remote water isolation
Automatic water management systems
Water meters and metering equipment
Leak detection and automatic isolation systems
Water conservation systems
Solar-powered installations
OEM water control equipment
High-flow potable water distribution
Applications requiring zero-power position holding
Technical Information
WRAS Approval Certificate: 2304324
Valve Type: Latching / bi-stable solenoid valve
Protection: IP65
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