Description
1" Normally Open Chemical Solenoid Valve PTFE, PVC or PP – 160B25
The 160B25 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 160B25 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 25mm orifice, Kv 10.3 m³/h and a 0.3–6 Bar operating pressure range, the 160B25 provides high flow capacity for demanding chemical handling applications.
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 means the valve automatically returns to the open position when electrical power is removed, making it suitable for chemical systems where continued flow is the preferred power-failure condition.
Ports & Connections
Nominal Size: DN25
PVC P1 Body: 32mm cement socket
PP P2 Body: 32mm weld socket
PTFE P4 Body: 1" BSP threaded connection
The three body options allow the valve construction and connection method to be selected according to the process media and associated chemical pipework.
Pressure & Flow
Operating Pressure: 0.3 to 6 Bar
Minimum Differential Pressure: 0.3 Bar
Orifice: 25mm
Kv Flow Factor: 10.3 m³/h
Water Flow: Approximately 172 L/min
Maximum Media Viscosity: 50 cSt
The large 25mm internal flow path provides substantial capacity for chemical transfer, treatment and 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 separates the solenoid armature mechanism from the process media, 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 industrial solenoid system allows extended periods of energised operation when required by the control application.
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 160B25?
The 160B25 combines normally open fail-safe operation with a large 25mm flow path, chemically resistant PVC, polypropylene or PTFE body options and a PTFE bellows-isolated dry armature.
With a Kv of 10.3 m³/h, approximately 172 L/min water flow and a 0.3–6 Bar operating range, the 160B25 provides a strong combination of flow capacity and chemical resistance.
Its normally open design makes it particularly useful where the valve should automatically open following electrical power loss or where the normal process condition requires continuous flow.
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