TLW® Wafer Check Valves are Designed for Safety: Eliminates Leak Paths, No Exposed Bolts

Press Release Summary:

TLW® Wafer Check Valves feature a single solid body construction with no exposed bolts to ensure a tight seal and prevent leak paths. Offered in 2 to 24 in. line sizes, the product allows either horizontal or vertical installation and is compatible with steam, water, and gaseous media. Units are constructed from A216-grade WCB carbon steel or A 351 CF8M stainless steel. TLW  valves meet API 594 face-to-face dimensions and MSS SP-61 and API 598 (shell and seat) testing standards.

Original Press Release:

DFT® Model TLW® Wafer Check Valve - Designed for Safety: Eliminates Leak Paths, No Exposed Bolts

Exton, PA—DFT Inc., an industry leader in the manufacture of non-slam axial flow check valves for more than 70 years, proudly announces the release of its new TLW® Check Valve. The TLW® is a Tapped Lug Wafer style silent check valve specifically designed for use in horizontal and vertical installations for liquid, gas, and steam applications where exposed bolts are not suitable.

“At DFT, we listen to our customers’ requests and take pride in helping solve issues or problems within their applications” says Jeff Kane, Sales and Marketing Director at DFT. “To address safety requirements and precautions in refinery and chemical applications, we were requested to engineer and manufacture a tight sealing, non-slam check valve. With its 1-piece solid body construction (to prevent leak paths) the TLW® has no exposed bolts, which could affect the integrity of the valve in the event of fire or corrosive environments. The TLW® Check Valve is the answer to this request, and we have included this in our full product line.”

This check valve was designed for use in a refining industry application but is relevant for any industry where bolts are required not be exposed to fire or corrosion. As with all other DFT check valves, this silent check valve reduces the potential for reverse flow and water hammer and is designed for long life and low maintenance.

The TLW® is a spring-assisted, center-guided check valve with a lightweight compact wafer-style design (fits between mating flanges), meets API 594 face-to-face dimensions, and its testing meets MSS SP-61 and API 598 (shell and seat). The valve is available in 2" to 24" line sizes, and it is constructed of A216-grade WCB carbon steel or A 351 CF8M stainless steel. Other alloys per ASME 16.34 are available by request.

Standard trim materials include a stainless steel seat, disc, and bushing (optional soft seat seal available). The valve can be installed either horizontally or vertically and is compatible with steam, water, and gaseous media. Custom sizing is available for low flow applications.


DFT® Inc. manufactures world-class, problem-solving, in-line, axial flow, nozzle style, silent check valves and severe service control valves. DFT engineers design products using the latest CAD, FEA, and CFD design technology software. Our staff responds quickly and our systems are designed to deliver reliably within our ISO9001-2015 quality management system. For more than seventy years DFT has solved check valve problems, prevented check valve failure, and water hammer, and solved severe service control valve problems.

We take pride in working closely with our customers to solve complicated problems. The results are valves that provide superior performance, long service life, and low maintenance costs. In addition, our customers enjoy confidence in product that is backed by a team of professionals ready to serve and support.

DFT offers sanitary valves, non-slamming, and non-return valves, chemical valves, vacuum breaker valves, restrictor valves, compressor valves, wafer, threaded, flanged valves, socket weld valves, soft seat valves, in-line valves, straight-thru design valves, silent check valves, spring assisted valves, horizontal, and vertical valves.

For further information about the TLW® Check Valve or other DFT products please visit our website at, or contact us at or phone 1-800-206-4013.

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