Description
1¼" WRAS Normally Open Water Solenoid Valve – ASCO Sirai L282D48
The ASCO Sirai L282D48-11/4 is a 1¼" BSP WRAS approved normally open brass solenoid valve designed for potable water, commercial water services, water treatment and industrial water-control applications.
This 2/2 way normally open, pressure-assisted diaphragm valve is open when de-energised and closes when electrical power is applied. The large 30mm orifice, Kv flow factor of 15 m³/h and 0.5 Bar minimum differential pressure provide high flow performance for larger water systems requiring fail-open operation.
Valve Function & Operation
Function: 2/2 Way Normally Open
Fail Position: Open
Energised Position: Closed
Operation: Pressure Assisted Diaphragm
Design: Full Orifice Pilot Operated
Minimum Differential Pressure: 0.5 Bar
Maximum Differential Pressure: 10 Bar
Maximum Allowable Pressure (PS): 10 Bar
The pilot-operated diaphragm construction provides high flow capacity while maintaining relatively low electrical power consumption. A minimum 0.5 Bar pressure differential is required for reliable operation.
1¼" BSPP Connection & High Flow
Port: 1¼" BSPP Female
Thread Standard: ISO 228
Orifice: 30mm
Kv Flow Factor: 15 m³/h
The 30mm full-flow orifice provides excellent capacity for larger commercial water services, plant rooms, water treatment equipment and industrial process-water systems.
WRAS Approved EPDM Seals
The L282D48 is supplied with WRAS approved EPDM sealing materials for potable-water applications.
✓ Latest WRAS Approval No. 250702716
✓ Approval Valid Until 31 July 2030
Body: Brass
Internal Components: Brass & Stainless Steel
Guide Assembly: Stainless Steel
Seat: Brass
Seal Material: WRAS Approved EPDM
The L282D-BIG construction combines a substantial brass valve body with stainless steel internal components and EPDM sealing for potable-water installations.
Potable Water Applications
Suitable applications include:
✓ Potable Water
✓ Process Water
✓ Water Treatment
✓ Commercial Water Systems
✓ Industrial Water Control
✓ Fail-Open Water Circuits
✓ Compatible Liquids
Maximum Media Viscosity: 37 cSt
Media Temperature: -10°C to +85°C
Ambient Temperature: -10°C to +50°C
For liquids other than water, compatibility with the brass, stainless steel and EPDM wetted materials should be confirmed.
Normally Open Fail-Safe Operation
The L282D48 is designed to remain open when electrical power is removed and close when the solenoid is energised.
This makes it particularly suitable for larger water-control systems where the required power-failure position is open, allowing water flow to resume automatically following loss of electrical power.
Controlled Switching
Opening Time: Approximately 300–1500ms
Closing Time: Approximately 1000–2000ms
The controlled diaphragm movement helps reduce abrupt changes in water flow and associated hydraulic shock.
Solenoid Coil
DC Power: 9 Watts
AC Power:
28VA Inrush
20VA Holding
Duty Cycle: ED 100% Continuous
Insulation: Class F 155°C
Class H 180°C Option
Electrical Connection: DIN 46340 3-Pole Connector
Connector Standard: EN 175301-803
Protection: IP67 with Connector
The continuous-duty operator allows the valve to remain energised for extended periods where required.
Voltage Options
DC:
✓ 12V DC
✓ 24V DC
AC:
✓ 24V AC
✓ 110/120V AC
✓ 230V AC
Other voltages and frequencies are available on request.
Dimensions & Weight
For the 1¼" version:
Overall Length: 113mm
Overall Height: 132mm
Overall Width: 81mm
Weight: Approximately 1.59kg
Typical Applications
✓ Potable Water Systems
✓ Commercial Water Installations
✓ Priority Water Systems
✓ Water Treatment Equipment
✓ Industrial Process Water
✓ High Flow Water Control
✓ Fail-Open Water Systems
✓ Cooling Water Systems
✓ Building Services
✓ OEM Machinery
Why Choose the 1¼" L282D48?
The 1¼" L282D48 provides a substantial increase in flow capacity over the standard L282 screwed range while retaining the advantages of normally open fail-safe operation.
Its 30mm orifice and Kv 15 m³/h provide excellent flow performance for larger water services, while the 0.5 Bar minimum differential pressure allows reliable pressure-assisted operation.
The combination of WRAS approved EPDM sealing, fail-open operation, IP67 protection, 100% continuous duty and proven ASCO Sirai construction makes the L282D48 particularly suitable for commercial water, water-treatment and industrial installations requiring dependable high-flow control.
Available L282D-BIG Sizes
1¼" BSP – 30mm – Kv 15 m³/h
1½" BSP – 45mm – Kv 27 m³/h
2" BSP – 45mm – Kv 34 m³/h
Related Products & Categories
