Description
DN15 3/2 Way Air Pilot Coaxial Valve – RSG 38015
The RSG 38015 is a DN15 3/2 way externally controlled coaxial valve designed for reliable switching, diverting and exhausting of compatible liquids and gases at pressures from 0 to 64 Bar.
Available as normally closed or normally open, the valve uses a double-acting pneumatic piston with return spring, operated by a 3–8 Bar pilot air supply. The externally controlled design provides reliable operation from zero differential pressure, while the three-port configuration allows the process medium to be switched between two separate flow paths.
The DN15 RSG 38015 provides a manufacturer-rated Kv flow coefficient of 6.6 m³/h and is available with standard 3/8", 1/2", 3/4" or 1" BSP connections.
Valve Function & Operation
The RSG 38015 is a 3/2 way coaxial valve available in two switching configurations.
380A15 – Normally Closed
In the normal position, the main P → A flow path is closed and the alternative flow path is selected. Applying pilot pressure switches the valve to connect the main process flow.
380B15 – Normally Open
The main P → A flow path is open in the normal position and switches to the alternative flow path when the pneumatic actuator is operated.
Because actuation is provided independently by the pneumatic pilot system, the valve does not require process pressure or a minimum differential pressure to operate.
DN15 Ports & Connections
Standard DN15 process connections:
✓ G3/8 BSP
✓ G1/2 BSP
✓ G3/4 BSP
Optional connections include:
✓ G 1" BSP
✓ Special Connections
✓ Alternative R Port Orientation
The R connection can be supplied in different orientations to simplify installation and pipework routing within machinery and process systems.
Pressure & Performance
Operating Pressure: 0 to 64 Bar
Reverse Pressure: Up to 16 Bar
Minimum Differential: 0 Bar
Pilot Pressure: 3 to 8 Bar
Nominal Diameter: DN15
Orifice: 15mm
Kv Flow Coefficient: 6.6 m³/h
Flow paths provide:
P → A: Up to 64 Bar
A → P: Up to 16 Bar
P → R: Up to 64 Bar
R → P: Up to 16 Bar
This combination allows the RSG 38015 to control both the primary and alternative flow paths at substantial process pressures.
3/2 Way Coaxial Valve Design
Unlike a conventional 2/2 way shut-off valve, the RSG 38015 incorporates three process ports and two switching paths within a single coaxial valve assembly.
This allows one valve to perform functions such as:
✓ Supply & Exhaust
✓ Pressure & Return
✓ Fluid Diversion
✓ Filling & Venting
✓ Process Changeover
✓ Pressure Release
The coaxial construction provides a relatively unrestricted flow path combined with independent pneumatic actuation.
Switching Performance
Opening / Closing Time: 50–1000ms
Actual switching time depends upon operating pressure, pilot pressure, pilot valve selection and any exhaust-air throttling fitted to the pneumatic control circuit.
The valve can be installed in any mounting position.
High Viscosity Fluids
The RSG 38015 is suitable for compatible fluids with viscosities up to 1000 cSt.
Typical applications can include:
✓ Hydraulic Oils
✓ Lubricating Oils
✓ Thick Process Oils
✓ Viscous Process Fluids
✓ Cooling Fluids
✓ Compatible Industrial Liquids
Actual suitability depends upon viscosity, operating temperature, pressure and compatibility with the selected wetted materials.
Construction & Materials
Standard Body: Brass
Optional Body Materials:
✓ AISI 303 Stainless Steel
✓ AISI 316 Stainless Steel
Internals: Stainless Steel 316L
Stainless steel versions provide increased corrosion resistance for applications where brass is unsuitable for the process medium or operating environment.
Standard Seal Construction
Standard sealing materials include:
✓ FKM Seals
✓ PTFE Dynamic Sealing
✓ PTFE Seat Sealing
Optional:
✓ EPDM Seal Configuration
The appropriate sealing configuration should be selected according to the process medium and operating temperature.
Media Compatibility
The RSG 38015 can control liquids and gases compatible with its selected body and sealing materials.
Typical applications include:
✓ Hydraulic Oils
✓ Lubricating Oils
✓ Process Liquids
✓ Cooling Fluids
✓ Viscous Process Media
✓ Compatible Chemicals
✓ Compatible Gases
✓ Fluids Up To 1000 cSt
For aggressive chemicals, specialist gases or unusual process fluids, compatibility should be confirmed against all wetted materials before ordering.
Water Service Seal Option
For demanding water applications, the RSG 38015 can be configured with UHMW Polyethylene sealing.
The UHMW Polyethylene configuration provides:
✓ Maximum Temperature +80°C
✓ High Wear Resistance
✓ Excellent Abrasion Resistance
✓ Low Friction
✓ Good Lubricity
✓ Debris-Stripping Seal Action
The sharp-edged dynamic sealing action helps remove limescale and small deposits from the moving sealing surface during operation, making this configuration particularly useful for industrial water systems where contamination or deposits may be present.
Gas Service Seal Option
For compatible gaseous media, the RSG 38015 can be configured with Fluoroloy® A21 sealing.
The Fluoroloy® A21 configuration provides:
✓ Maximum Temperature +80°C
✓ High Wear Resistance
✓ Low Friction
✓ Broad Chemical Compatibility
✓ Reliable Dynamic Sealing
The actual gas, pressure and operating temperature should be specified when ordering to ensure the appropriate valve and seal configuration is supplied.
Vacuum & Clean Service
A vacuum configuration is available for applications where process pressure cannot be relied upon to operate the valve.
Because switching force is provided independently by the pneumatic actuator, the RSG 38015 remains suitable for zero-pressure and vacuum applications.
An oil and grease-free configuration is also available for clean process requirements.
Temperature
Media Temperature: -10°C to +100°C
Ambient Temperature: -10°C to +50°C
Water Seal Option: Up to +80°C
Gas Seal Option: Up to +80°C
The correct sealing arrangement should be selected according to the media and required operating temperature.
Pneumatic Pilot Specification
Actuation: External Pneumatic Pilot
Actuator: Double-Acting Piston
Return: Spring Return
Pilot Pressure: 3–8 Bar
Pilot Connections: G1/4
Interface: NAMUR
Mounting Position: Any Position
An upstream air preparation unit is recommended to provide a clean pilot-air supply and help maximise actuator service life.
NAMUR Pilot Valve Options
The NAMUR interface allows a suitable 5/2 way pilot solenoid valve to be mounted directly onto the actuator.
Available configurations include:
✓ NAMUR Pilot – Side Connections
✓ NAMUR Pilot – Top Connections
✓ M12 Solenoid Pilot
✓ 24V DC Pilot Valve
✓ 230V 50Hz Pilot Valve
Exhaust throttles and silencers can also be fitted to the pneumatic pilot circuit where required.
ATEX Pilot Option
An explosion-protected electrical pilot option is available for suitable hazardous-area applications.
ATEX Pilot Marking:
II 2G Ex m II T4
II 3D IP65 T130°C
When the Ex pilot configuration is selected, the permissible valve operating pressure is reduced by approximately 20%.
The required hazardous-area classification and operating pressure should therefore be specified when ordering.
Optional Features & Accessories
Available options include:
✓ Normally Closed 380A15
✓ Normally Open 380B15
✓ Stainless Steel Body
✓ Mounting Brackets
✓ Position Indication
✓ Oil & Grease-Free Version
✓ Vacuum Configuration
✓ NAMUR Pilot Solenoid Valve
✓ Alternative R Port Orientation
✓ Exhaust Air Throttles
✓ Exhaust Silencers
✓ Power Reduction Connector
✓ ATEX Pilot Option
✓ Modular Valve Systems
Position Indication
Optional inductive position switches can provide electrical confirmation of the valve's open and/or closed position.
Versions with LED indication and a 2-metre cable can be supplied for connection to PLCs, machinery controls, alarms and process monitoring systems.
Typical Applications
✓ High-Pressure Fluid Control
✓ Supply & Exhaust Systems
✓ Pressure & Return Circuits
✓ Fluid Diverting Systems
✓ Hydraulic Systems
✓ High Viscosity Fluids
✓ Lubrication Systems
✓ Process Machinery
✓ Vacuum Systems
✓ Industrial Automation
✓ Process Skids
✓ OEM Equipment
✓ Compatible Gas Systems
Why Choose the RSG 380 Series?
The RSG 380 combines 3/2 way directional control with an externally operated coaxial process-valve design.
The DN15 RSG 38015 operates from zero differential pressure up to 64 Bar, provides a substantial Kv 6.6 m³/h flow coefficient and handles compatible viscous fluids up to 1000 cSt.
With NC or NO operation, brass or stainless steel construction, specialist water and gas sealing, NAMUR pilot control and optional position feedback, the RSG 38015 provides a flexible solution for demanding three-port industrial process applications.
Available Versions
380A15 – Normally Closed
380B15 – Normally Open
Nominal Diameter: DN15
Pressure: 0–64 Bar
Reverse Pressure: Up to 16 Bar
Kv: 6.6 m³/h
Standard Connections:
✓ 3/8" BSP
✓ 1/2" BSP
✓ 3/4" BSP
Related Products & Categories
