DFT® Vacuum Breakers provide reliable and effective protection against the collapse of pressure vessels, tanks, and rolls. They prevent condensate “back-up” when equipment is shut down or inlet steam is reduced by modulating control valves. In piping systems, DFT® Vacuum Breakers are used to break siphons, prevent pipe collapse during transient pressure drops, and provide the addition of air on the downstream side of check valves to dampen water hammer.

This variation of a check valve, or Vacuum Breaker, features a spring-assisted silent closure. If there is no pressure on the valve, the spring pushes the disc into a closed position.

Other features include:

1” to 4” size (Outside diameter)
• 450 to 6000 CWP
• Threaded O.D. (MNPT)
• Unthreaded inlet bore
• Stainless steel construction
• Spring-assisted silent closing
• Horizontal or vertical installation
• Tight shutoff - lapped disc & seat
• Easy maintenance
• Versatile
• Options:
 - Inconel® X-750 spring
 - Soft seat (for bubble-tight shutoff)

To download DFT’s eBook on Vacuum Breaker Check Valves: Your Defense against Pipe Collapse & Pressure Vessel Damage  - click here -

ABOUT DFT® Inc.:
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-five 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 many different types of valves, including sanitary valves, vacuum breaker valves, restrictor valves, compressor valves, wafer, threaded, and flanged valves, socket weld valves, soft seat valves, in-line valves, silent check valves, spring-assisted valves, non-slamming, and non-return valves, chemical valves, horizontal and vertical valves. DFT also has a line of Control Valves featuring a straight-thru Venturi design that is cavitation resistant. visit us online at www.dft-valves.com