Flanged Backflow Protection for Water & Wastewater Systems
Proco ProFlex™ Style 710 is a full-port, concentric flanged rubber duckbill check valve developed for direct bolting to existing or new pipe flanges. Its flexible all-rubber construction opens under forward inlet pressure and closes automatically when reverse pressure occurs, providing dependable backflow control without conventional hinges, springs, or mechanical closing components.
The valve comes standard with ANSI 125/150 flange drilling, while DIN, JIS, BS, AS, square, and rectangular flange configurations can also be supplied for specific installations. This flexibility allows the rubber check valve to be used for new pipelines as well as replacement of conventional flap or sluice gate arrangements.
Style 710 can be installed vertically or horizontally and is available in a broad range of sizes. Its low cracking pressure, full-port configuration, abrasion-resistant construction, and quiet closure make the duckbill check valve suitable where efficient discharge and automatic reverse-flow protection are important.
Explore Style 710 flanged rubber duckbill check valves for backflow prevention, with vertical and horizontal installation options. Dutco supplies the ProFlex™ Style 710 for projects requiring a reliable backflow prevention valve across water, wastewater, drainage, and infrastructure systems.
Full-Port Design for Reliable Backflow Control
- Automatic Closing Action – Operates entirely through inlet and back pressure without external actuation.
- Backflow Protection – The flexible duckbill closes when reverse pressure occurs, allowing the valve to function as a dependable rubber backflow check valve.
- Low Cracking Pressure – Proco identifies a typical cracking pressure of approximately 1–2 inches (25–50 mm) of head.
- Full-Port Flow Path – Concentric configuration provides an unobstructed passage during forward flow.
- No Water Hammer – Flexible closure avoids the abrupt mechanical slam associated with many conventional check valves.
- Abrasion Resistance – All-rubber construction helps the valve handle abrasive slurry and challenging discharge conditions.
Flanged Installation Across New & Existing Pipework
- Direct Flange Connection – Bolts directly to existing or newly installed pipeline flanges.
- Multiple Drilling Standards – Standard ANSI 125/150 drilling with DIN, JIS, BS, AS, and other flange configurations available.
- Horizontal or Vertical Installation – Provides greater installation flexibility according to pipeline orientation.
- Flap Valve Replacement – Allows quick interchange with many existing flap-type valves.
- Special Flange Options – Square and rectangular configurations can be supplied for difficult flap-gate or sluice-gate replacement projects.
- Wide Size Availability – Standard product information lists sizes from 1 to 96 inches, with larger and special configurations available.
Types
The Style 710 can be configured according to operating pressure, flange arrangement, and elastomer requirements. Proco offers standard-rated valves, higher-pressure configurations with internal reinforcement, and several elastomer constructions for different service conditions.
Standard Rated (SR) Style 710
The Standard Rated configuration is intended for normal operating head and back-pressure requirements. It retains the full-port concentric profile and direct-flange installation associated with the Style 710 rubber check valve.
- Available as a standard production configuration
- Suitable for typical inlet and reverse-pressure conditions
- Provides low-head-loss backflow protection
- Can be installed vertically or horizontally
Style 710 with Internal Vacuum Supports (IVS)
For higher pressure or vacuum requirements, Proco can manufacture Style 710 with Internal Vacuum Supports. These supports are incorporated into the reinforced inner structure of the valve while maintaining an unobstructed flow path.
- Suitable for higher back-pressure or vacuum conditions
- Helps provide anti-inversion support
- Maintains full-flow characteristics
- Provides a reinforced flanged rubber check valve configuration for more demanding service conditions
ANSI 125/150 Flanged Style 710
This is the standard flange-drilling arrangement supplied for Style 710 and is suited to compatible ANSI pipeline connections.
- Standard ANSI 125/150 flange drilling
- Direct bolting to existing or new pipe flanges
- Suitable for conventional pipeline installations
- Provides a practical flanged rubber check valve replacement for compatible mechanical check valves
Alternative Flange Configurations
Style 710 can also be manufactured with DIN, JIS, BS, AS, square, or rectangular flange arrangements where the project connection differs from the standard ANSI configuration.
- Supports international flange standards
- Square and rectangular options available
- Useful for flap-gate and sluice-gate replacement
- Helps match the valve to existing site infrastructure
Standout Features & Benefits
Reliable Reverse-Flow Protection
- Closes automatically when downstream pressure exceeds inlet pressure.
- Helps protect connected pipelines and discharge systems from unwanted reverse flow.
- Provides a passive backflow prevention valve without motors or mechanical actuation.
- The flexible construction allows the valve to operate as a rubber backflow check valve across varying flow conditions.
Low Head Loss
- Very low cracking pressure allows the valve to open under relatively small forward head.
- Full-port configuration minimizes obstruction to forward flow.
- Particularly useful where gravity discharge or low-pressure pumping conditions need to be maintained.
Quiet, Non-Slam Operation
- Flexible rubber closure avoids the sudden impact of hinged metallic valves.
- Helps eliminate water hammer associated with valve slam.
- Supports quieter operation in pumping and discharge systems.
Low Maintenance Construction
- Contains no conventional hinges, springs, bearings, or mechanical closure mechanisms.
- Proco identifies negligible maintenance and energy costs as key advantages.
- Flexible construction will not freeze or permanently deform under specified operating conditions.
Flexible Material Selection
- Multiple elastomer options allow compatibility with different service conditions.
- Polyester tire-cord reinforcement is used across the available constructions.
- NSF/ANSI 61-certified neoprene material is available for suitable potable-water applications.
Application Areas
Wastewater Treatment & Effluent Discharge
- Prevents reverse flow into wastewater discharge pipelines.
- Flexible construction can handle abrasive or solids-bearing media.
- Suitable where a low-maintenance rubber check valve is preferred over a mechanical flap valve.
Sewerage & Drainage Networks
- Helps stop downstream sewage or drainage water from flowing back into connected pipework.
- Vertical and horizontal installation options simplify integration into different layouts.
- Suitable for gravity and pumped discharge systems requiring automatic reverse-flow protection.
Stormwater & Flood-Control Systems
- Helps prevent receiving water from backing up into stormwater outfalls.
- Low cracking pressure supports gravity-driven discharge.
- Full-port construction helps maintain discharge capacity during storm events.
Pump Stations & Outfalls
- Suitable for pump discharge lines exposed to downstream back pressure.
- Non-slam closure helps minimize water hammer when pumping stops.
- Provides a flexible alternative to mechanical check-valve arrangements.
Potable & Process Water Systems
- NSF/ANSI 61-certified neoprene configurations are available for suitable potable-water use.
- Can be installed as part of clean-water and process-water piping.
- Provides a configurable Style 710 rubber check valve option according to fluid compatibility and pressure requirements.
Infrastructure Retrofit Projects
- Can replace many existing flap-type valves without completely redesigning the discharge arrangement.
- Alternative flange drilling and square or rectangular configurations accommodate non-standard connections.
- Well suited to rehabilitation projects where an existing valve needs to be replaced with a simpler, flexible design.
