MeasurIT R7F Valve



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Key Features

  • Reliable backflow prevention

  • Minimal bottom clearance required

  • 100% elastomer construction eliminates maintenance

  • Will not corrode, warp or freeze open or shut

  • 1”-2” Cracking Pressure, Low Headloss

  • Curved Bill enhances sealing around debris

  • Custom built for each application based on pressure and flow conditions

  • Available in diameters from 4" (100mm) to 72” (1800mm)

The R7F is essentially a TF-1 duckbill valve pre-attached to a stainless steel back plate fabricated to suit site conditions.

The R7F is delivered to site as a one-piece unit for ease of installation to a wall, whether a headwall, manhole wall, box culvert, quay wall etc. it makes no difference.

General Description

The TF-1 has become the preferred Tideflex configuration for outfalls. The TF-1 features a flat bottom and flared top. This allows the valve to be installed at a lower overall elevation than other configurations, with less bottom clearance required. This is especially important in low-lying areas where maintaining as much driving head is critical, or where silt, sand and debris might tend to collect beneath the valve.

The TF-1 is ideal for manhole applications, such as junction boxes, diversion chambers and interceptors, where the invert of the pipe is close to the floor of the vault. These vaults are designed to maximize the available gravity head; thus, the invert pipe is as close to the floor as possible. The TF-1 allows installations in such structures and are easily retrofit to existing structures, often replacing failed flap valves, without the need for breaking up the concrete floor to provide bottom clearance.

The Tideflex Duckbill Check Valve is a revolutionary design for backflow prevention. Tideflex Valves are a one-piece rubber matrix of numerous natural and synthetic elastomers and ply reinforcement, similar in construction to a truck tyre. Tideflex are cost-effective because they do not need periodic maintenance or repair to keep them operational and they have a 30 year operational life span. Tideflex valves operate using line pressure and backpressure to open and close so no outside energy source is required. The valve has an extremely low cracking pressure so the valve self-draining which eliminates standing water and maximizes storage volume in the upstream pipe.

Tideflex Valves have low headloss, they do not rust or corrode and are not affected by UV so performance and reliability is constant throughout the life of the valve. The flexibility of the Tideflex allows the valve to compress around trapped solids providing a much better seal than flap valves, as confirmed by the USEPA. With the development of the patented curved bill, sealing capabilities are even further improved because the curved bill is more flexible than the rest of the valve and therefore compresses more around solids.

The original Tideflex design, the TF-2, has a flare on the top and bottom of the valve. It has been superseded by the TF-1 and has been standardised by many consultants and owners. The patented TF-1 design is a product of 25 years of experience, research and development and testing elastomeric "duckbill" check valves. In addition to the benefits provided by a flat-bottom valve, the TF-1 also benefits from the increased angle of the upper "spine". The inherent geometry and construction of the TF-1 yields a more durable check valve with greater strength to support not only the weight of the valve itself, but the weight of the water discharging from it. In large diameter valves, this weight can amount to several tons!

For higher backpressure ratings or to lower headloss while maintaining backpressure ratings, the Saddle Support Technology (SST) can be used in conjunction with the Series TF-1.

Return to Tideflex Duckbill Valves general page.