Vacuum Breakers

Product catalog summary

Overview: The document provides detailed information about Kadant Johnson Vacuum Breakers, specifically the Series VB8. These devices are designed to prevent unwanted vacuum conditions in closed vessels or pipelines, protecting against contamination, collapse, or implosion.

Specifications: The vacuum breakers are constructed with stainless steel components, including a retainer tube, ball, and spring, and feature an EPR seat for sealing. They are rated for pressures up to 300 psig and temperatures up to 365°F, with higher pressures possible depending on size and materials.

Design and Functionality: The vacuum breakers offer fast-acting, tight-closing capabilities with high capacity. The combination of a spring action on a round ball and a soft resilient seat ensures positive bubble-tight closing at low differential pressures. The design minimizes noise and eliminates chatter, ensuring quiet operation.

Installation and Maintenance: These devices are easy to install with hex heads and standard NPT pipe threads. They can be installed in both vertical and horizontal positions using a reducing bushing to prevent flow obstruction. Maintenance is straightforward due to the simple design.

Testing and Reliability: Kadant Johnson Vacuum Breakers undergo rigorous testing, including endurance tests with steam and vacuum cycles, ensuring they open and close reliably even after extensive use. Each unit is bubble-tested before leaving the factory.

Applications: Typical applications include protection of heating coils, steam boilers, textile dry cans, and heat exchangers. They are used to break vacuums that can occur during shutdowns or when modulating control valves close.

Performance Data: The document includes detailed tables with specifications for various sizes, including outlet size, total length, and orifice diameter. It also provides vacuum requirements to open and air handling capacities, plotted using Cv factors.

Contact Information: Kadant Johnson is based in Three Rivers, MI, USA, and offers a range of fluid handling products. Contact details and additional product offerings are provided for further inquiries.

Catalog excerpts

Protection against collapse or back flowing. Vacuum Breakers Anti-siphoning check valves Vacuum check valves and backflow devices.

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Series VB8 Stainless Steel Retainer Tube Stainless Steel Ball Body EPR Seat Stainless Steel Spring Fast acting, tight closing, high capacity Kadant Johnson Vacuum Breakers provide a simple, dependable way to relieve any unwanted vacuum condition that may develop in a closed vessel or pipeline. They can be used to prevent contamination from back flowing in fluid handling systems and to protect equipment against collapse or implosion. They combine tight closing with instant response; provide large air venting capacity; are designed for easy installation and long service life. Positive closing,...

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Size Quick Ship No. (Brass) Quick Ship No. (Stainless Steel) Outlet Outlet Size Total Length “L” Engaged Length “E” O.D. of Tube “D” Diameter of Orifice 3/8" – 24A75500 Plain 1/4" 1-1/2" 1-1/8" 9/16" 1/4" 3/8" 24A75200 24A75600 Threaded 1/4" 1-1/2" 1-1/8" 9/16" 1/4" 1/2" 24A75900 24A76300 Plain 3/8" 1-3/4" 1-3/8" 11/16" 9/32" 1/2" 24A76000 24A76400 Threaded 3/8" 1-3/4" 1-3/8" 11/16" 9/32" 3/4" 24A76700 24A77100 Plain 1/2" 2-1/8" 1-5/8" 13/16" 13/32" 3/4" 24A76800 24A77200 Threaded 1/2" 2-1/8" 1-5/8" 13/16" 13/32" 1" 24A77500 24A77900 Plain 3/4" 2-3/8" 1-7/8" 1-1/16" 19/32" 1" 24A77600 24A78000...

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Kadant Johnson Vacuum Breakers Horizontal storage heater with heating coils protected by a Kadant Johnson Vacuum Breaker. Typical Installations of Kadant Johnson Vacuum Breakers Kadant Johnson Vacuum Breaker installed on heating coil. When the modulating control valve closes, the steam in the coil will condense. A vacuum may exist in the coil even with the control valve partly open and positive pressure between the control valve and the coil. Textile dry cans, multiple slasher cylinders, print cans, etc., can be protected against collapse with Kadant Johnson Vacuum Breakers. Typical application...

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Vacuum Breakers

Vacuum Breakers

Catalog excerpts

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