Description
1" Manual Pressure Reducing Valve 0–200 Bar – RSG 786-H
The RSG Type 786-H is an externally controlled pressure reducing valve designed for precise, stepless downstream pressure regulation in high-pressure liquid systems.
The valve is installed inline and uses manual control with pneumatic pilot pressure to maintain the required reduced outlet pressure. It is a normally closed (NC) design, providing controlled downstream pressure while the upstream supply can be as high as 200 Bar.
The standard 786-H is DN12 with G1 BSP connections, 3.75 m³/h flow capacity, AISI 303 stainless steel construction and FKM seals.
Valve Function & Operation
Function: Pressure Reducing Valve
Operation: Externally Controlled
Valve Function: Normally Closed
Control: Manual Stepless
Nominal Diameter: DN12
Maximum Pressure: 200 Bar
Manual Stepless Pressure Regulation
The RSG 786-H allows the required reduced pressure to be adjusted continuously rather than being limited to predetermined pressure settings.
No electrical supply or 0–10V control signal is required.
This makes the 786-H particularly suitable for systems requiring a stable manually selected outlet pressure without electronic proportional control.
Pressure & Control Range
Maximum Pressure: 200 Bar
Two actuator configurations are available:
AG1 – Single Piston
Control Range: 0–100 Bar
AG2 – Double Piston
Control Range: 0–200 Bar
The manufacturer confirms these two control ranges and shows the AG1 and AG2 constructions separately in the dimensional drawings on page 2.
Pressure Control Characteristics
The pressure-control graphs on page 3 show the relationship between pneumatic control pressure and regulated media pressure.
AG1 covers media pressure from 0 to 100 Bar.
AG2 extends this to 0 to 200 Bar.
In both configurations, the control-air requirement remains below approximately 6 Bar across the plotted operating range, while the manufacturer's overall control-air specification permits up to 8 Bar.
This allows a relatively low pneumatic control pressure to regulate a substantially higher liquid pressure.
Ports & Flow
Connection: G1 BSP
Nominal Diameter: DN12
Flow Capacity: 3.75 m³/h
The 786-H is therefore a specialist high-pressure regulator rather than a multi-size general-purpose pressure reducing valve.
Inline Pressure Reduction
The 786-H is designed to regulate pressure from P to A through the valve, maintaining a controlled reduced pressure downstream.
This is an important distinction from a bypass pressure limiting valve:
786-H → Pressure Reducing
785-H → Pressure Limiting
The 786-H is therefore suited to applications where downstream machinery or process equipment must operate at a controlled pressure below the available supply pressure.
AISI 303 Stainless Steel Construction
Body: AISI 303 Stainless Steel
Seal: FKM
Nominal Diameter: DN12
Connection: G1 BSP
RSG identifies the body material as 1.4305 / AISI 303 stainless steel and the standard seal as FKM.
Compatibility should be confirmed between the process liquid and the stainless steel/FKM construction.
Liquid Media & Filtration
Media: Compatible Liquids
Maximum Media Contamination: 50 Microns
Control Air: Maximum 8 Bar
Control Air Filtration: 40 Microns
The 50µ figure applies to contamination in the process liquid, while the pneumatic control-air supply requires filtration to 40µ or better.
Temperature
Media Temperature: 0°C to +60°C
Ambient Temperature: 0°C to +50°C
These limits apply to the standard AISI 303 stainless steel and FKM configuration.
No Electrical Supply Required
Unlike the 786-E proportional version, the 786-H does not require an electrical supply or analogue control signal.
This eliminates the need for:
✓ 24V DC Supply
✓ 0–10V Analogue Signal
✓ PLC Analogue Output
✓ Electronic Pressure Controller
Pressure regulation is instead achieved through the manually controlled pneumatic system.
AG1 & AG2 Actuator Options
The dimensional drawings on page 2 show two actuator arrangements.
AG1 – Single Piston
Maximum Control Range: 100 Bar
Overall Height: approximately 143mm
AG2 – Double Piston
Maximum Control Range: 200 Bar
Overall Height: approximately 181mm
Both versions retain the same G1 process connections and basic 786-H valve construction.
Mounting Position
RSG specifies: Manometer preferably upright
This is the recommended installation orientation for the standard valve.
Typical Applications
✓ Downstream Pressure Regulation
✓ High-Pressure Fluid Systems
✓ Hydraulic Process Systems
✓ Industrial Fluid Control
✓ Equipment Pressure Protection
✓ High-Pressure Test Equipment
✓ Process Machinery
✓ Machine Tool Systems
✓ Test Rigs
✓ Process Skids
✓ OEM Equipment
✓ Fixed Pressure Regulation
Why Choose the RSG 786-H?
The RSG 786-H provides manual stepless downstream pressure regulation at pressures up to 200 Bar without requiring an electrical supply or electronic controller.
Its externally controlled design uses a relatively low pneumatic control pressure to regulate considerably higher liquid pressure, while AG1 and AG2 actuator options provide 0–100 Bar or 0–200 Bar control ranges.
With a DN12 flow path, 3.75 m³/h capacity, G1 BSP connections, AISI 303 stainless steel body and FKM seals, the 786-H provides a robust solution for high-pressure industrial liquid regulation.
Available Versions
786-H AG1
Control Range: 0–100 Bar
Actuator: Single Piston
786-H AG2
Control Range: 0–200 Bar
Actuator: Double Piston
Common Specification:
DN12
G1 BSP
3.75 m³/h Flow
AISI 303 Stainless Steel
FKM Seals
Manual Stepless Control
The manufacturer's ordering code is 786 H 00 00 /12/ V2 G1 F – AG1/AG2, confirming the manual H control, DN12 size, AISI 303 body, G1 connection and FKM seal.
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