Description
1" WRAS Water Solenoid Valve 0.35–12 Bar – ASCO Sirai L182D01
The ASCO Sirai L182D01-1 is a 1" BSP WRAS approved brass solenoid valve designed for high-flow potable water, hot water, water treatment and industrial water-control applications.
As the largest screwed connection in the standard L182 range, this 2/2 way normally closed, pressure-assisted diaphragm valve combines a large 24mm orifice with an excellent Kv of 12 m³/h. It operates across a 0.35 to 12 Bar differential pressure range, making it particularly suitable for commercial plant and larger water systems requiring high flow without moving to the L182D-BIG range.
Valve Function & Operation
Function: 2/2 Way Normally Closed
Operation: Pressure Assisted Diaphragm
Design: Full Orifice Pilot Operated
Minimum Differential Pressure: 0.35 Bar
Maximum Differential Pressure: 12 Bar
Maximum Allowable Pressure (PS): 20 Bar
The pilot-operated diaphragm construction allows the large 24mm main orifice to be controlled with relatively low solenoid power.
A minimum 0.35 Bar pressure differential is required across the valve for reliable operation.
1" BSPP Connection & High Flow
Port: 1" BSPP Female
Thread Standard: ISO 228
Orifice: 24mm
Kv Flow Factor: 12 m³/h
The 1" version provides the highest flow capacity within the standard 3/8"–1" screwed L182 family.
Its Kv of 12 m³/h represents a substantial increase over the 5 m³/h 3/4" version, making valve sizing particularly important where maximum water flow and minimum pressure loss are priorities.
WRAS Approved EPDM Seals
The L182D01 uses EPDM sealing material manufactured from a WRAS certified compound.
✓ Latest WRAS Approval No. 250702716
✓ Approval Valid Until 31 July 2030
Body: Brass
Internal Components: Brass & Stainless Steel
Core Tube: Stainless Steel
Seat: Brass
Seals: WRAS Approved EPDM
This provides robust industrial construction combined with sealing materials suitable for WRAS potable-water applications.
Potable & Hot Water Applications
Suitable applications include:
✓ Potable Water
✓ Hot Water
✓ Process Water
✓ Water Treatment
✓ Commercial Water Systems
✓ Heating Water Circuits
✓ Compatible Liquids
Maximum Media Viscosity: 37 cSt
For media other than water, compatibility with the brass, stainless steel and EPDM wetted materials should be confirmed.
High Temperature Water Service
Media Temperature:
-10°C to +140°C with EPDM
Ambient Temperature:
-10°C to +60°C
The ability to handle EPDM-compatible water service up to +140°C makes this valve particularly useful for hot-water and commercial heating applications where conventional WRAS valves may have insufficient temperature capability.
Switching Performance
Opening Time: 90ms
Closing Time: 420ms
The manufacturer specifies the 1" version as having the fastest closing time within the standard L182 screwed range.
Solenoid Coil
DC Power: 5.5 Watts
AC Power:
12VA Inrush
6VA Holding
Insulation: Class F
Duty Cycle: ED 100% Continuous
Electrical Connection: 3-Pole Plug Connector
Protection: IP65 with Connector
The relatively low electrical consumption is particularly useful given the large 24mm flow path and Kv 12 m³/h capacity of the valve.
Voltage Options
DC:
✓ 12V DC
✓ 24V DC
AC:
✓ 24V AC
✓ 115V AC
✓ 230V AC
Other voltages and frequencies are available on request.
Low Power Coil Option
An optional reduced-power coil is available where electrical consumption and coil temperature need to be minimised.
DC Power: 3 Watts
AC Power: 3.5VA
Maximum Differential Pressure: 8 Bar
The standard coil should therefore be used where the full 12 Bar pressure capability is required.
Installation
The valve may be installed in any position, although mounting with the solenoid vertically upwards is preferred.
Dimensions & Weight
For the 1" L182:
Overall Length: 105mm
Overall Height: 106mm
Overall Width: 71mm
Weight: Approximately 1.08kg
Despite its considerably greater flow capacity, the valve therefore remains relatively compact for a 1" industrial water solenoid valve.
Typical Applications
✓ Potable Water Systems
✓ High Flow Water Control
✓ Hot Water Distribution
✓ Commercial Plant Rooms
✓ Water Treatment Equipment
✓ Industrial Process Water
✓ Washdown Systems
✓ Commercial Heating Equipment
✓ Building Services
✓ OEM Machinery
Why Choose the 1" L182D01?
The major advantage of the 1" L182D01 is flow capacity.
Its 24mm orifice and Kv of 12 m³/h provide more than twice the Kv of the 3/4" L182, making it an excellent choice where high water throughput is required without moving to a larger 1¼" or 1½" valve.
At the same time, it retains the important characteristics of the smaller L182 models: WRAS approved EPDM seals, only 0.35 Bar minimum differential pressure, hot-water capability up to +140°C and continuous-duty operation.
For larger 1¼" to 2" pipework, the L182D-BIG range provides the next step in flow capacity.
L182 WRAS Range
3/8" BSP – Kv 2.5 m³/h
1/2" BSP – Kv 3.8 m³/h
3/4" BSP – Kv 5.0 m³/h
1" BSP – Kv 12 m³/h
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