Tideflex Check Valves
A Revolutionary Design for Backflow Prevention
Tideflex® Duckbill Check Valves have low head loss and achieve the tightest possible seal for backflow operations, particularly at low flow rates.
The flexibility of the Tideflex® Check Valve allows the valve to compress around trapped solids, providing a much better seal than flap gates. With the development of the patented Curved Bill, sealing capabilities are further improved because the Curved Bill is more flexible than the rest of the valve and will compress even more around solids. Our check valves offer low cracking pressure to eliminate standing water and maximize storage volume in the upstream pipe.
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Tideflex® Check valves feature a one-piece elastomer and ply reinforced body, similar in construction to a truck tire. As a result, our check valves are not affected by rust, corrosion or UV. They require no maintenance and have a long life span, making Tideflex® Check Valves extremely cost effective.
The check valves operate using line pressure and backpressure to open and close, so no outside energy source is required. When you specify a Tideflex® Check Valve, you are guaranteed a proven record of maintenance-free backflow prevention.
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The CIL - Series 33 and 39 In-Line Check Valves are designed to handle abrasive slurries, sewage, sludge and other difficult services. At the heart of the Series 33 and Series 39 Check Valves are fabric-reinforced elastomer check sleeves that provide through flow at minimum pressure drop across the valves at all times. Forward pressure opens the valves automatically, reverse pressure seals the valves. The check sleeves even seal around entrapped solids.
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This inner rubber duckbill check valves minimize wear and deterioration caused by continuous operation of abrasive slurries. There are no mechanical parts such as hinges, disks or metal seats that can freeze, corrode or bind valve operation.
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The Series 33 and Series 39 In-Line Check Valves are each provided with a clean-out port and two flush ports and both have a cast iron body, which is available epoxy-coated or rubber-lined. The valves have thru-drilled flange holes and face-to-face dimensions that meet ASME B16.10 specs. When ordering, line pressure and back pressure must be provided as each valve is custom-built to match flow requirements of the installation.
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For smaller diameter applications, consider our threaded Series 2633 in sizes 1/2 to 3". For larger applications, consider the Series 39F In-Line Check Valve in sizes to 84".
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The large-diameter CIL - Series 39F In-Line Check Valve is designed to handle abrasive slurries, sewage, sludge and other difficult services. The valve’s operation is silent and non-slamming, just like the smaller Series 39.
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At the heart of the Series 39F Check Valve is a fabric-reinforced, elastomer check sleeve that provides through flow at minimum pressure drop across the valve at all times. Forward pressure opens the valve automatically and reverse pressure seals the valve. The check sleeve even seals around entrapped solids. This inner elastomer check valve minimizes wear and deterioration caused by continuous operation of abrasive slurries. There are no mechanical parts such as hinges, disks or metal seats that can freeze, corrode or bind valve operation.
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The Series 39F In-Line Check Valve is provided with clean-out ports and flush ports for routine maintenance and cleaning. The valve features an epoxy-coated, fabricated-steel body. The valve has thru-drilled flange holes and face-to-face dimensions meet ASME B16.10 specs. The Series 39F is also available in a plain end x plain end configuration. The Series 39F can also be specially fabricated with offset flanges and a RTF-1 sleeve when bottom clearance is limited (consult factory for special configurations). When ordering, line pressure and back pressure must be provided, as each valve is custom-built to match the flow requirements of the installation.
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The CIL Series 37 In-Line Flanged Check Valve is a simple, reliable, cost-effective solution for backflow prevention. The revolutionary design of the 37 is similar to the Series 35, but the Series 37 bill does not flare and is designed to be inserted into the downstream pipe and fastened between two mating flanges, eliminating the need for a valve body. Because most of the valve is inserted into the downstream pipe, the face-to-face dimension of the Series 37 is just the flange thickness, making it ideal for applications with space limitations. In order to fit inside the pipe, the bill cannot flare and therefore the head loss of the Series 37 is higher than other styles of Tideflex® Check Valves. The Series 37 is not only installed in piping systems, but is used extensively in concrete manholes and structures where the valve is inserted into the effluent pipe and the flange is anchored to the concrete wall with a retaining ring.
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The Series 37 flange size drilling conforms to ASME Class 125/150# and is also available with DIN drillings and other standard or customized drilling patterns. Series 37 Check Valves are not supplied with retaining rings, as they are typically installed between pipe flanges, but retaining rings can be supplied for applications that require it.
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Manufactured on the same principle as the revolutionary all-rubber Tideflex® Check Valve, the CIL - Series 2633 In-Line Check Valve is a simple in-line check valve for threaded end pipelines. Simple in design, the Series 2633 consists of a body, two endcaps and the working element - the Tideflex® elastomer check sleeve. In the open position, the sleeve creates a wide, free passage proportional to the flow in the pipeline. On flow reversal, the sleeve closes slowly and completely. The silent, non-slamming Series 2633 In-Line Check Valve design eliminates water hammer and facilitates low head loss.
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Containing no levers, packing, springs or interference fits to corrode or freeze, the valve is virtually maintenance-free. The only replacement part is the simple, rugged elastomer check sleeve. This small and simple in-line check valve is ideal for liquids, gases, powders, slurries and instrument or plant air, as well as in any environment where preventing backflow is critical.
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The Series 2633 is manufactured in sizes 1/2 to 3" NPT. The check sleeve is available in a variety of elastomers to match specific service conditions.
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The CIL - Series 37G In-Line Check Valve is a special adaptation of the Series 37. The 37G can be completely inserted into a pipe which effectively gives it a zero face-to-face dimension. The outside diameter of the 37G’s cuff is fabricated to precisely match the inside diameter of the pipe, providing a press-fit. The valve is supplied with an internal expansion clamp to provide compression between the valve and pipe I.D. The 37G can even be fabricated for elliptical or out of round pipe (consult factory for special fabrications).
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As with the Series 37, the bill does not flare and the head loss of the 37G is higher than other styles of Tideflex® Check Valves. The 37G is predominantly used in gravity-driven outfall pipes and in manholes and vaults where the valve is inserted into the effluent pipe and compressed to the pipe I.D. with the expansion clamp. The 37G can be inserted into the end of a pipe, but access to clamp should be from upstream of the valve, not through the bill of the valve. For those applications where there is no access to the upstream side of the valve, the 37G Thimble Insert is the solution.
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The CTF - Series TF-1 Duckbill Check Valve has become the preferred Tideflex® Check Valve configuration for outfalls. Designed for in-structure and end-of-pipe installations, 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.
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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 installation in such structures and is easily retrofitted to existing structures, often replacing failed flapgates. There is no need to break up the concrete floor to provide bottom clearance.
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The TF-1 installs by slipping over the end of an exposed piece of pipe and is fastened with compression clamps. The inside diameter of the TF-1’s cuff is fabricated to exactly match the outside diameter of the pipe.
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In some applications, a Slip-on Tideflex® Duckbill Check Valve (TF-1) is not feasible because of an existing mating flange or wall thimble, or a flanged connection is preferred, or it is desired to mount the valve directly to a concrete wall. In these cases, the CTF Series 35-1 Flanged Duckbill Check Valve is the solution.
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Series 35-1 Check Valves are manufactured similarly to the Tideflex® TF-1 Check Valve, with the addition of an integral elastomeric flange. The flange size drilling conforms to ASME Class 125/150# and is also available with DIN drillings and other standard or customized drilling patterns. All Series 35-1 Check Valves are furnished complete with retaining rings for installation.
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The CTF - Series TF-2 Duckbill Check Valve was the first duckbill check valve introduced by Tideflex®. The TF-2 was developed based on a United States Environmental Protection Agency (EPA) grant in the 1980s to overcome excessive costs in maintenance and replacement of non-performing flapgates. The TF-2's flared top and bottom design has been enhanced by the Series TF-1 Duckbill Check Valve. The TF-1 features a flat bottom that requires minimal bottom clearance.
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The TF-2 installs by slipping over the end of an exposed piece of pipe and is fastened with compression clamps. The inside diameter of the TF-2’s cuff is fabricated to exactly match the outside diameter of the pipe.
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The TF-2 can also be installed on the O.D. of elliptical pipe and many arch pipes. Tideflex® also offers a thimble plate option allowing the slip-on TF-2 to be installed directly to a headwall or seawall.
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The CTF Series 35 Flanged Duckbill Check Valve is manufactured similarly to the Series TF-2, with the addition of an integral elastomeric flange. The Series 35 can be mounted to mating flanges or wall thimbles or directly to concrete walls. The Series 35's design has been enhanced by the flat-bottom design pf the Series 35-1 Flanged Duckbill Check Valve. The 35-1 requires minimal bottom clearance.
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The Series 35 flange size drilling conforms to ASME Class 125/150# and is also available with DIN drillings and other standard or customized drilling patterns.
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All Series 35-1 Check Valves are furnished complete with retaining rings for installation.
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The CWF - Waterflex Check Valve is specifically designed for potable water and clean water applications with low suspended solids. The valves are NSF61 Certified for potable water applications. The Waterflex comprises a rod-guided ply-reinforced membrane and perforated disc. The Waterflex is available in a wafer style (WF-2) and full-faced wafer style with ASME, DIN or other standard drilling pattern (WF-3). Waterflex Check Valves have low head loss and a high backpressure rating. They do not have moving parts such as hinges and springs that can seize if routine maintenance and lubrication is not performed.
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Waterflex membranes are fabricated in dedicated compression molds and are ply-reinforced for superior durability. Waterflex operate solely on differential pressure – forward differential pressure deflects the membrane away from the perforated disc allowing flow. Reverse differential pressure forces the membrane against the disc to prevent backflow. Waterflex Check Valves eliminate bang and slamming problems common to conventional swing check valves.
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The CMU CheckMate UltraFlex® In-Line Check Valve works by preventing unwanted backflow that can cause surcharging and flooding. The valve minimizes damage to commercial, wetlands, beaches and residential areas. It also eliminates hydraulic surges to wastewater treatment plants, saving municipalities millions of dollars in maintenance and treatment costs.
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The CheckMate UltraFlex® has extremely low head loss and seals around debris. It operates completely on differential pressure, no outside energy source or operation is needed. Unlike other in-line check valves, the CheckMate UltraFlex® Valve contains no molded parts. It is hand-fabricated, utilizing multiple natural elastomers, synthetic elastomers, wire-reinforced plys and fabric-reinforced plys for a heavy-duty unibody construction. There are no mechanical parts or fasteners to catch debris, corrode or fail. This design makes the CheckMate® 100% maintenance-free and easy to install. With seven elastomers to select from, the CheckMate UltraFlex® Valve can be custom engineered to resist chemicals, grease and oils typically found in stormwater, wastewater and industrial applications.
