Description
DN25 Coaxial Solenoid Valve – 0-64 Bar Direct Acting
RSG 27125 High Pressure Coaxial Solenoid Valve for Fluids, Gases & Vacuum
The RSG 27125 is a direct acting 2/2 way coaxial solenoid valve designed for reliable switching of liquids, gases, vacuum and high-pressure process media from 0 Bar pressure.
Unlike conventional pilot-operated solenoid valves, the pressure-balanced coaxial design operates without a minimum differential pressure and provides reliable performance from vacuum through to 64 Bar. Suitable for fluids up to 500 cSt viscosity and a wide range of compatible gases, the RSG 271 Series is ideal for demanding industrial applications requiring higher pressure capability, low wear and exceptional service life.
The DN25 orifice provides increased flow capacity compared with smaller DN10, DN15 and DN20 models whilst maintaining zero-pressure operation, high leak-tightness, flexible material options and reliable performance across a wide range of industrial applications.
Key Features
2/2 way normally closed operation
Normally open version available
Direct acting coaxial valve design
Operates from 0 Bar pressure
Pressure-balanced construction
Suitable for fluids up to 500 cSt viscosity
Suitable for vacuum applications
Suitable for gases and compressed air
DN25 / 25mm orifice
Operating pressure 0 to 64 Bar
Reverse flow capability up to 16 Bar
Brass body as standard
Optional stainless steel AISI303 or AISI316 bodies
316L stainless steel internal components
Multiple seal material options
High leak-tightness versions available
IP65 DIN43650A coil included
TÜV and DVGW approved
Free UK delivery available
Typical Applications
High pressure liquids
Compressed air systems
Industrial gases
Vacuum systems
Chemical processing
Oxygen service
Water treatment equipment
Laboratory equipment
OEM machinery
Industrial automation
Pressure testing equipment
Test rigs and process skids
Technical Specification
Function: 2/2 Way Normally Closed
Alternative Version: Normally Open Available
Valve Type: Direct Acting Coaxial Solenoid Valve
Operating Pressure: 0 to 64 Bar
Reverse Flow Pressure: Up to 16 Bar
Orifice Diameter: 25mm
Kv Flow Factor: 205 L/min / 12.3 m³/h water @ 1 Bar pressure drop
Maximum Fluid Viscosity: 500 cSt
Media Temperature: -10°C to +100°C
Ambient Temperature: -10°C to +50°C
Mounting Position: Any
Brass Valve Weight: 7.1kg
Port Sizes Available
3/4" BSP
1" BSP
1 1/4" BSP
Optional Connections
NPT threads
PN16, PN40 and PN100 flanged versions
Body Materials
Brass
AISI303 stainless steel
AISI316 stainless steel
Internal Components: Stainless Steel 316L
Coil Specification
Protection Rating: IP65
Electrical Connector: DIN43650A Included
Duty Rating: 100% Continuous Duty
Voltage Tolerance: ±10%
Power Consumption: 77W at 24V DC / 85W at 230V AC
Voltage Options
12VDC
24VDC
24VAC
110VAC
230VAC
Special voltages available
Seal Options
Standard Fluids
FKM + PTFE
Optional
NBR
EPDM
Water Service Seals
UHMW Polyethylene
Excellent wear and abrasion resistance
Very good lubricity in water-based media
Sharp-edged dynamic seal helps remove limescale and debris from the piston/plunger
Maximum media temperature +80°C
Gaseous Service Seals
Fluoroloy®
Excellent wear-resistant material
Low friction
Broad chemical compatibility
Excellent leak-tightness performance with gaseous media
Maximum media temperature +80°C
Special Service Options
Water service seal options
Gas service seal options
Oxygen service options
Vacuum service option
High leak-tightness version
Oil and grease-free construction
Increased Leak-Tightness Version
Increased leak-tightness to 10⁻⁵ mbar·l/sec is available for demanding gas and vacuum applications.
This version includes:
Valve cleaned oil and grease-free
Special treatment of the valve seat
Special seal components
Helium leak-tightness testing
Energy Saving PWM Connector Option
The 24VDC version can be fitted with our optional PWM Pulse Width Modulation DIN43650A energy-saving connector.
Benefits include:
Up to 80% reduction in holding power consumption
Significantly reduced coil temperatures
Reduced energy consumption
Longer solenoid coil life
Reduced enclosure temperatures
Improved thermal stability
Lower operating costs
Greener low-power operation
Other PWM voltages are available upon request.
Optional Features
Manual override
Position indication switches E1 or E2
Inductive open and/or closed position switches with LED
2 metre cable on position switch options
LED DIN connector
Aluminium terminal box
Oil and grease-free construction
Mounting brackets
Modular sub-base mounted systems
Special electrical voltages
Special connection options
Available Versions
271A25 – Normally Closed
271B25 – Normally Open
Related Products & Categories
Additional Information
The DN25 version provides increased flow capacity compared with DN10, DN15 and DN20 models whilst maintaining true zero-pressure operation, vacuum compatibility, gas service capability and suitability for compatible fluids up to 500 cSt viscosity.
For lower pressure applications up to 40 Bar, please see the RSG 270 Series. For higher operating pressures up to 100 Bar, please see the RSG 272 Series coaxial valve range.
