Description
2½" Normally Open Brass Solenoid Valve – CEME 8720
The CEME 8720-ESM-NBR is a 2½" 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 65mm orifice, conventional Kv flow factor of 63 m³/h and operating pressure up to 10 Bar, the 8720 provides very high 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: 2½" BSP Female
Orifice: 65mm
Operating Pressure: Up To 10 Bar
Kv Flow Factor: 63 m³/h
The large diaphragm and 65mm flow path make the 8720 particularly suitable for applications requiring high flow through 2½" pipework.
2½" BSP Connection & High Flow
Port: 2½" BSP Female
Orifice: 65mm
Kv Flow Factor: 63 m³/h
The manufacturer specifies a conventional Kv of 63 m³/h, providing substantially greater flow capacity than smaller Type 87 models.
This makes the 8720 suitable for large cooling-water circuits, process-water systems, industrial plant and other high-flow installations.
Adjustable Closing Characteristics
The 8720-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 larger 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 industrial fluid-control applications.
The Type 87 design 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 Fluids
Maximum Viscosity: 50 cSt
Compatibility should be confirmed for fluids other than water and air according to the brass body and NBR sealing materials.
Temperature
NBR Media Temperature: Up To +90°C
Maximum Ambient Temperature: +80°C
Alternative Type 87 seal materials provide higher temperature capability where required. The manufacturer specifies EPDM to +130°C and FPM to +150°C within the wider Type 87 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
Dimensions & Weight
For the 2½" CEME 8720:
Overall Length: 245mm
Overall Height: 186mm
Overall Width: 184mm
Dimension D: 140mm
Weight: Approximately 9.5kg
Typical Applications
✓ High Flow Water Systems
✓ Cooling Water Circuits
✓ Industrial Process Water
✓ Compressed Air Systems
✓ Pump Control Systems
✓ Industrial Automation
✓ Large Pipework Systems
✓ Water Hammer Reduction
✓ Fail-Open Fluid Control
✓ OEM Machinery
Why Choose the CEME 8720?
The CEME 8720 is designed for large 2½" pipework requiring high flow and normally open fail-safe operation.
Its substantial 65mm orifice and Kv 63 m³/h provide very high 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 8720 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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