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Av-Tek - SDX Sliding Disc Check Valves

Av-Tek – SDX Sliding Disc Check Valves

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The Av-Tek SDX Check Valve is a robust, silent check valve designed for water applications. Constructed with a ductile iron body and stainless steel trim, it features a spring-assisted, short-disc design for rapid, slam-free closure and minimal pressure loss. Coated with fusion-bonded epoxy for corrosion resistance, the SDX ensures reliable backflow prevention and durability, meeting AWWA standards for efficient, low-maintenance performance across a range of flow conditions.

Learn more: https://avtekvalves.com/product/sdx-sliding-disc-check-valves/

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PRODUCT DESCRIPTION:

Main Features

  • Sliding Disc Design
  • Rev: A 11/21
  • The Av-Tek SDX combines the technology of the standard Silent Style Check valve, with the advanced features of the Av-Tek DEX Double Eccentric Butterfly Valve providing bubble tight shut off in clean water applications, without the fear of losing the seat due to high velocities or being pulled loose.

What's Different

Typical silent check valves come standard metal seated, which have leakage. If bubble tight shut off is required, other manufactures machine a small groove into the seat of the valve and hand press an O-Ring into that small groove. This provides "bubble tight shut off" until the O-Ring falls out of the groove, and gets caught up in the spring, this is a common failure. The Av-Tek SDX check valve, has a mechanically retained seat on the disc ensuring the resilient seat is blowout proof. This also allows for much faster velocities and bubble tight shut off. The seat is easily replaceable only requiring an Allen Wrench.

316L SST Welded Body Seat

The Nickel Chromium (316L) Stainless Steel body seat is applied to the Ductile Iron valve body by means of a robotic welded overlay process and then micro finished and polished. The chemical properties of the Nickel Chromium SST prevent corrosion between the seat and the Ductile Iron valve body. The permanent welding process eliminates the possibility of body seat separation and undercutting.

Certified Zero Leakage

Each SDX check valve is tested in accordance with EN Standards and AWWA standards, AvTek® provides a unique test certificate for each valve that leaves its factory. The certificate includes a leak test report, tightness, and heat trace numbers of the valve components.

Ease of Maintenance

This new modern design requires zero to minimal maintenance. The CUSN12 Bronze bushings are self lubricating and are wear resistant. In the event of seal replacement or repair it can be accomplished in the field, with common tools, without the need of replacing a body seat or disc.

Oversized Body

To maximize the flow and reduce head loss an oversized body is utilized ensuring maximum flow through the valve. The body of the valve is equal to the OD of the flange.

High Working Pressures

ASTM A536 Ductile Iron body with a 316 Stainless Steel shaft make the Av-Tek® SDX suitable for 250 PSI CWP applications as a standard and Av-Tek offers the SDX for pressures up to 580 psi.

Size Offering

  • 6” to 48” - Class 150B ANSI Class 125 flanged or AWWA C519 250B ANSI Class 250 or DN
  • PN10 - PN 40 Flanges also available.

Drinking Water Safe

Certified to NSF/ANSI 61/372 for use in potable water systems.

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