Description
3" Normally Open Brass Solenoid Valve – CEME 8721
The CEME 8721-ESM-NBR is a 3" BSP normally open brass solenoid valve designed for high-flow water, compressed air, light oils and other compatible neutral fluids.
This 2/2 way normally open, pressure-assisted diaphragm valve remains open when electrical power is removed and closes when energised. With its large 75mm orifice, conventional Kv flow factor of 83 m³/h and operating pressure up to 10 Bar, the 8721 provides exceptional flow capacity for large industrial water and fluid-control systems.
Valve Function & Operation
Function: 2/2 Way Normally Open
Fail Position: Open
Energised Position: Closed
Operation: Pressure Assisted Diaphragm
Port Size: 3" BSP Female
Orifice: 75mm
Operating Pressure: Up To 10 Bar
Kv Flow Factor: 83 m³/h
The large diaphragm and 75mm flow path make the 8721 particularly suitable for applications requiring very high flow through 3" pipework.
3" BSP Connection & High Flow
Port: 3" BSP Female
Orifice: 75mm
Kv Flow Factor: 83 m³/h
The 3" model provides the highest flow capacity within the standard BSP Type 87 range, making it particularly suitable for large cooling-water circuits, process-water systems, industrial plant and other high-flow installations.
Adjustable Closing Characteristics
The 8721-ESM-NBR can be configured with interchangeable pilot jets to alter the valve closing characteristics.
Available Pilot Jets:
✓ 1.0mm Pilot Jet
✓ 0.8mm Pilot Jet
✓ 0.6mm Pilot Jet
✓ 0.4mm Pilot Jet
Selecting a smaller pilot jet slows the closing response, helping reduce sudden pressure changes in large-bore pipework systems.
This can be particularly useful where hydraulic shock or water hammer is a concern.
Brass & NBR Construction
Body Material: Brass
Seal Material: NBR
Diaphragm: NBR
The robust brass body and replaceable diaphragm construction are designed for demanding industrial fluid-control applications.
The Type 87 construction also provides replaceable coil, pilot assembly, spring and diaphragm components for servicing and maintenance.
Media Compatibility
Suitable applications include:
✓ Water
✓ Compressed Air
✓ Light Oils
✓ Cooling Water
✓ Process Water
✓ Compatible Neutral Gases
✓ Compatible Neutral Fluids
Maximum Viscosity: 50 cSt
For fuels, LPG, propane or other specialist gases and liquids, compatibility and application suitability should be confirmed for the brass body, NBR seals and installation requirements before use.
Temperature
NBR Media Temperature: Up To +90°C
Maximum Ambient Temperature: +80°C
Alternative Type 87 sealing materials provide higher temperature capability where required, with EPDM rated to +130°C and FPM to +150°C within the wider family.
Solenoid Coil
DC Power: 16 Watts
AC Power:
15VA Holding
25VA Inrush
Duty Cycle: 100% ED Continuous
Coil Insulation: Class H
Electrical Connection: DIN 43650A Form A
Protection: IP65
The 16W DC / 15VA AC operator provides dependable switching for this large normally open diaphragm valve.
Voltage Options
DC:
✓ 12V DC
✓ 24V DC
✓ 48V DC
✓ 110V DC
AC:
✓ 12V AC
✓ 24V AC
✓ 48V AC
✓ 110V AC
✓ 230V AC
✓ 400V AC 50/60Hz
Other voltages may be available according to coil configuration.
Dimensions & Weight
For the 3" CEME 8721:
Overall Length: 250mm
Overall Height: 196mm
Overall Width: 184mm
Dimension D: 145mm
Weight: Approximately 11.23kg
Typical Applications
✓ High Flow Water Systems
✓ Cooling Water Circuits
✓ Industrial Process Water
✓ Compressed Air Systems
✓ Large Pipework Systems
✓ Pump Control Systems
✓ Industrial Automation
✓ Process Fluid Control
✓ Water Hammer Reduction
✓ Fail-Open Fluid Control
Why Choose the CEME 8721?
The CEME 8721 is the largest and highest-flow BSP model within the Type 87 range, designed for demanding 3" pipework installations requiring normally open fail-safe operation.
Its substantial 75mm orifice and Kv 83 m³/h provide exceptional flow capacity, while the normally open configuration allows fluid flow to continue automatically when electrical power is removed.
Interchangeable pilot jets provide an additional advantage in large water systems by allowing the closing characteristics to be tailored to the installation, helping reduce hydraulic shock and water hammer.
The combination of brass construction, NBR sealing, continuous-duty coil and serviceable diaphragm design makes the 8721 particularly suitable for demanding industrial water and fluid-control applications.
Available Type 87 Sizes
3/8" BSP – 10mm – Kv 1.86 m³/h
1/2" BSP – 12mm – Kv 2.10 m³/h
3/4" BSP – 20mm – Kv 5.70 m³/h
1" BSP – 25mm – Kv 9.60 m³/h
1¼" BSP – 32mm – Kv 22 m³/h
1½" BSP – 39mm – Kv 27 m³/h
2" BSP – 51mm – Kv 35 m³/h
2½" BSP – 65mm – Kv 63 m³/h
3" BSP – 75mm – Kv 83 m³/h
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