FlowGuard FS™ Back Pressure Valve
The FlowGuard FS™ Back Pressure Valve (BPV) is a self-actuated pressure control valve designed to maintain stable upstream pressure and enhance the performance of Automatic Recirculation Valve (ARV) systems. Frequently used in conjunction with the FlowGuard HP™ Automatic Recirculation Valve, the FlowGuard FS helps prevent cavitation, vaporization, pressure instability, and excessive flow velocity in high-pressure pump applications.
FlowGuard FS™ Back Pressure Valve
Optimized Pressure Control for Complete Pump Protection Systems
The FlowGuard FS™ Back Pressure Valve (BPV) is a self-actuated pressure control valve designed to maintain stable upstream pressure and enhance the performance of Automatic Recirculation Valve (ARV) systems. Frequently used in conjunction with the FlowGuard HP™ Automatic Recirculation Valve, the FlowGuard FS helps prevent cavitation, vaporization, pressure instability, and excessive flow velocity in high-pressure pump applications.
By maintaining a controlled back pressure within the recirculation line, the FlowGuard FS ensures optimal operating conditions for centrifugal pumps and improves the overall reliability of pump protection systems.
What is a Back Pressure Valve?
A Back Pressure Valve (BPV) is a pressure-regulating valve installed downstream of a recirculation system to maintain a predetermined upstream pressure. Unlike conventional control valves that require external instrumentation, the FlowGuard FS operates entirely through a self-actuated spring-loaded mechanism.
As system pressure changes, the valve automatically adjusts its opening position to maintain the desired pressure level, ensuring stable and predictable process operation.
Why Use a Back Pressure Valve with an Automatic Recirculation Valve?
In high-pressure pumping systems, fluid returning through the recirculation line can experience significant pressure changes. Without proper back pressure control, the system may encounter:
- Cavitation
- Vapor formation
- Excessive flow velocity
- Pressure fluctuations
- Unstable pump operation
- Reduced equipment life
The FlowGuard FS works alongside the FlowGuard HP Automatic Recirculation Valve to maintain the correct pressure profile within the bypass system, improving overall pump protection and operational reliability.
Key Features & Benefits
Self-Actuated Operation
No electrical power, pneumatic supply, or external control system is required.
Maintains Stable Upstream Pressure
Automatically regulates pressure to maintain preset operating conditions throughout the recirculation system.
Cavitation Prevention
Helps prevent fluid vaporization and cavitation within high-pressure pump protection systems.
Optimized ARV Performance
Enhances the effectiveness of Automatic Recirculation Valves by maintaining proper bypass pressure conditions.
Robust Industrial Construction
Designed for severe service applications in power generation, refinery, petrochemical, and process industries.
Easy Maintenance
Simple internal design allows straightforward inspection and maintenance procedures.
Technical Specifications
| Specification | FlowGuard FS™ |
|---|---|
| Valve Type | Self-Actuated Back Pressure Valve |
| Size Range | DN25 – DN150 (1" – 6") |
| Pressure Range | PN10 – PN400 |
| ANSI Rating | Class 150 – Class 2500 |
| Connection Types | Flanged, Wafer Style |
| Materials Available | A105, LF2, F304, F316 |
| Temperature Range | -196°C to +300°C |
| Control Method | Spring Loaded, Self-Actuated |
| Overflow Function | Optional |
Typical Applications
Boiler Feedwater Systems
Maintains stable recirculation pressure in high-pressure boiler feed pump protection systems.
Power Generation Plants
Supports reliable operation of condensate extraction pumps and auxiliary pumping systems.
Oil & Gas Facilities
Protects process pumps and high-pressure transfer systems from pressure instability.
Petrochemical Processing
Improves performance and reliability of minimum flow recirculation systems.
Water Treatment & Desalination
Maintains pressure stability within high-pressure pumping and recirculation applications.
How the FlowGuard FS Works
The FlowGuard FS utilizes a spring-loaded valve disc that responds directly to system pressure.
As upstream pressure increases above the preset value:
- The valve opens progressively.
- Flow is regulated through the valve.
- System pressure is stabilized.
As pressure decreases:
- The valve moves toward the closed position.
- The required back pressure is maintained.
- Stable pump operation is preserved.
This fully mechanical operation provides dependable pressure control without external instrumentation or control equipment.
Complete Pump Protection Solution
For critical pump applications, the combination of:
- FlowGuard HP™ Automatic Recirculation Valve
- FlowGuard FS™ Back Pressure Valve
creates a comprehensive pump protection system that controls both minimum flow and recirculation pressure.
Together, these valves help:
✓ Prevent cavitation
✓ Eliminate unstable operating conditions
✓ Protect centrifugal pumps
✓ Improve equipment reliability
✓ Reduce maintenance costs
✓ Extend service life
The result is a safer, more efficient, and more reliable pumping system for severe-service industrial applications.
