Description
1" Electronic Proportional Control Valve 0–10 Bar – RSG 787
The RSG Type 787 is a 2/2 way electronically controlled proportional valve designed for precise, stepless regulation of liquid flow using a 0–10V analogue control signal.
Rather than regulating pressure directly, the 787 provides stepless valve position control. The electrical 0–10V set point determines the valve stroke and therefore modulates the flow through the valve. This distinction is important for this product: RSG describes it as a 2/2 way proportional valve with stepless position regulation, not specifically as a pressure regulator.
The valve is normally closed, externally controlled and available in DN5 or DN15, with a G1 BSP connection and operating pressures up to 10 Bar.
Valve Function & Operation
Function: 2/2 Way Normally Closed
Operation: Externally Controlled
Control: Electronic Proportional
Control Signal: 0–10V
Design: Stepless Position Regulation
Connection: G1 BSP
The 787 continuously changes valve position according to the electrical set-point signal, allowing the flow through the valve to be dynamically controlled by a PLC, process controller or other compatible analogue control system.
Stepless 0–10V Position Control
The 0–10V input controls the valve stroke rather than simply switching the valve ON or OFF.
The function graph on page 2 shows the relationship between the analogue control signal and valve stroke. The valve remains essentially closed at the lower end of the signal range and then provides an approximately linear increase in stroke through to 100% opening as the signal approaches 10V.
This allows continuous modulation of liquid flow according to the requirements of the process.
DN5 & DN15 Versions
Two nominal sizes are available.
DN5
Pressure Range: 0–10 Bar
Connection: G1 BSP
Flow Capacity: 1,000 L/h
DN15
Pressure Range: 0–6 Bar
Connection: G1 BSP
Flow Capacity: 5,500 L/h
High Flow Proportional Control
Maximum Flow:
DN5: 1.0 m³/h
DN15: 5.5 m³/h
The larger DN15 version provides substantially greater flow capacity, while the DN5 version provides the higher 10 Bar pressure capability.
This allows selection around either the required flow capacity or operating pressure.
G1 BSP Connection
Both DN5 and DN15 versions use:
G1 / 1" BSP Female Thread
This means the process connection remains the same even though the internal nominal flow diameter changes.
Stainless Steel Construction
Body: AISI 303 Stainless Steel
Seal Options:
✓ FKM
✓ NBR
✓ EPDM
RSG specifies body material 1.4305 / AISI 303 with all three elastomer options included within the Type 787 ordering structure.
The correct seal should be selected according to the actual process liquid and operating conditions.
Liquid Media
Media: Compatible Liquids
Maximum Contamination: 50 Microns
Temperature
Media Temperature: 0°C to +60°C
Ambient Temperature: 0°C to +50°C
Pneumatic Control Air
The proportional actuator requires an external compressed-air supply.
Control Air Pressure: 5.5–8 Bar
Control Air Filtration: 40 Microns
This means the 787 is electro-pneumatically controlled: the 0–10V signal provides the electrical command while filtered compressed air supplies the actuator force.
Electrical Specification
Supply Voltage: 24V DC
Control Signal: 0–10V
Maximum Residual Ripple: 10%
Voltage Tolerance: ±10%
Power Consumption: 2.5 Watts
Duty Cycle: 100% ED
Electrical Connection: M12x1
Protection: IP65 with Connector
M12 Electrical Connection
The connection diagram on page 1 shows a four-pin M12 interface:
Pin 1 – Power Supply
Pin 2 – Set Point (-)
Pin 3 – GND (-)
Pin 4 – Set Point (+), 0–10V
This provides a straightforward interface with industrial PLCs and analogue process controllers.
Normally Closed Operation
The Type 787 is a normally closed valve.
RSG specifically identifies the switching function as:
NC – Normally Closed
This provides a defined closed valve position when the operating control is removed.
PLC & Process Control
The 0–10V control interface makes the 787 particularly useful for automated systems requiring variable flow rather than simple ON/OFF operation.
Typical control sources include:
✓ PLC Analogue Outputs
✓ Process Controllers
✓ Machine Controllers
✓ Automated Dosing Systems
✓ Remote Flow Controls
✓ Closed-Loop Control Systems
Where suitable external feedback is provided to the controller, the valve can form part of a closed-loop process-control system.
Mounting Position
RSG recommends:
M12 connector preferably upright
This is the preferred mounting orientation specified for the valve.
Typical Applications
✓ Proportional Liquid Flow Control
✓ Industrial Automation
✓ Process Fluid Regulation
✓ Automated Dosing Systems
✓ Machine Process Control
✓ Variable Flow Systems
✓ Test Equipment
✓ Process Skids
✓ Cooling Water Control
✓ OEM Machinery
✓ PLC Controlled Fluid Systems
✓ Closed-Loop Process Control
Why Choose the RSG 787?
The RSG 787 provides true stepless valve-position control from a standard industrial 0–10V analogue signal, making it suitable for applications where liquid flow needs to be varied continuously rather than simply switched ON and OFF.
Its normally closed design combines AISI 303 stainless steel construction, G1 BSP connections, 24V DC operation, M12 electrical connection and IP65 protection.
With DN5 and DN15 versions providing flows up to 5.5 m³/h and pressure capability up to 10 Bar, the Type 787 provides a compact electro-pneumatic proportional flow-control solution for industrial liquid systems.
Available Versions
787 DN5
Pressure: 0–10 Bar
Flow: 1.0 m³/h
Connection: G1 BSP
787 DN15
Pressure: 0–6 Bar
Flow: 5.5 m³/h
Connection: G1 BSP
Common specification:
AISI 303 Stainless Steel
FKM, NBR or EPDM Seals
24V DC Supply
0–10V Control
M12 Connection
IP65
5.5–8 Bar Control Air
The manufacturer's ordering code confirms DN5 and DN15, AISI 303, G1, FKM/NBR/EPDM, 24V DC and 0–10V electrical control.
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