Description
3/4" Normally Open Chemical Solenoid Valve PTFE, PVC or PP – 160B20
The 160B20 is a high-flow chemically resistant 2/2 way normally open solenoid valve designed for controlling acids, alkalis, water and other aggressive industrial fluids where a fail-open valve function is required.
Available with PVC, polypropylene (PP) or PTFE valve bodies, the 160B20 can be configured for chemical processing, dosing, water treatment and corrosive fluid applications. The pressure-assisted diaphragm design incorporates a PTFE isolating bellows, creating a dry-armature arrangement that isolates the solenoid mechanism from the process media.
The valve remains open without electrical power and closes when energised. With a large 20mm orifice, 163.66 L/min water flow and 0.3–6 Bar operating pressure range, the 160B20 provides substantially greater flow capacity than the smaller DN15 version.
Valve Function & Operation
Function: 2/2 way normally open
Operation: Pressure assisted / servo assisted
Valve Design: Diaphragm seat valve
Armature Design: PTFE bellows isolated dry armature
Normal Position: Open when de-energised
Energised Position: Closed
Failsafe Function: Opens on power loss
Minimum Differential Pressure: 0.3 Bar
Operating Pressure: 0.3 to 6 Bar
The normally open design makes the 160B20 particularly useful where flow should continue during an electrical power failure or where the normal operating condition requires the valve to remain open.
Ports & Connections
Nominal Size: DN20
PVC P1 Body: 25mm cement socket
PP P2 Body: 25mm weld socket
PTFE P4 Body: 3/4" BSP thread
The choice of PVC, polypropylene or PTFE construction allows both the chemical resistance and connection method to be matched to the process media and associated pipework.
Pressure & Flow
Operating Pressure: 0.3 to 6 Bar
Minimum Differential Pressure: 0.3 Bar
Orifice: 20mm
Water Flow: 163.66 L/min at 1 Bar pressure drop
Maximum Media Viscosity: 50 cSt
The large 20mm internal flow path provides high flow capacity for chemical transfer, water treatment and industrial process applications.
Construction & Materials
Body Options:
✓ P1 PVC
✓ P2 Polypropylene (PP)
✓ P4 PTFE
Solenoid Tube: Stainless steel
Internal Parts: Stainless steel
Armature Isolation: PTFE bellows
Seal Options: EPDM or FKM
The PTFE isolating bellows prevents the process media from entering the solenoid armature chamber, providing additional protection when controlling aggressive and corrosive fluids.
Media Compatibility
Suitable for compatible:
✓ Acids
✓ Alkalis
✓ Water
✓ Chemical dosing fluids
✓ Aggressive chemicals
✓ Corrosive process liquids
✓ Compatible gases
Maximum Media Viscosity: 50 cSt
Chemical compatibility should be checked against the selected PVC, polypropylene or PTFE body together with the EPDM or FKM seal configuration.
Coil & Electrical
Solenoid System: Nass Magnet 13/30
Coil Power: 15 Watt DC
AC Power: 17–22VA
Insulation: Class H 180°C
Duty Rating: 100% continuous
Protection: IP65 with connector fitted
Electrical Connection: DIN 43650A
The continuous-duty solenoid system is suitable for industrial applications requiring extended periods of energised operation.
Voltage Options
12V DC
24V DC
24V AC
110V AC
230V AC
AC versions are available at 50/60Hz.
ATEX Hazardous Area Option
An optional explosion-protected solenoid operator is available for hazardous-area applications.
ATEX: EEx m II T4
Gas: Ex mb IIC T4 Gb
Dust: Ex mb tb IIIC T130°C Db
Temperature Class: T4 / T130°C
The ATEX configuration should be selected according to the required hazardous-area classification and complete valve assembly.
Typical Applications
✓ Acid transfer systems
✓ Alkali transfer systems
✓ Chemical processing plants
✓ Water treatment equipment
✓ Chemical dosing systems
✓ Corrosive fluid control
✓ Industrial process equipment
✓ Fail-open chemical systems
✓ OEM chemical handling equipment
Why Choose the 160B20?
The 160B20 combines normally open fail-safe operation with a large 20mm flow path, chemically resistant PVC, polypropylene or PTFE body options and a PTFE bellows-isolated dry armature.
The valve automatically opens when electrical power is removed and energises to close, making it particularly suitable for chemical systems where continued flow is the preferred normal or power-failure condition.
With 163.66 L/min water flow and a 0.3–6 Bar operating range, the 160B20 provides a useful combination of high flow, chemical resistance and normally open operation.
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