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Vacuum Breakers

  • Vacuum Breakers
  • Vacuum Breakers
Vacuum breakers provide a simple, dependable way to relieve an unwanted vacuum in a closed vessel or pipeline.
Vacuums are often caused by cooling fluids and can cause equipment implosion or contamination from back siphonage. Kadant Johnson’s simple and reliable design provides instant response to vacuums and a large air venting capacity. They are easy to install and are rigorously tested for a long service life. Sizes are available from 3/8" to 1-1/2".

Features

  • Simple spring, ball, and O-ring design
  • Stainless steel ball, spring, and retainer tube construction
  • Low sealing spring pressure

  • Rated to 300 psig, 365°F

  • 100% factory bubble testing
  • Design endurance tested to 1M cycles
  • NPT threading available

Benefits

  • Instantaneous opening to vacuum conditions
  • Large air venting capacity
  • Low differential pressure sealing
  • Quiet, chatter free performance
  • Long and dependable life
  • Easy installation

Optimizing Performance

Operating pressures are possible beyond 300 psig depending upon size, seal materials, and temperatures. We offer product and system knowledge to choose the right vacuum breaker across multiple applications.

Media

Stories

Vacuum Breaker Basics – An interview with Erich Bernhardt

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File Downloads

Variable Moisture Steam™ Shower Supply System

Variable Moisture Steam™ Shower Supply System
Corrugating medium is being made with increasing amounts of recycled fiber. As fiber length and freeness decline, it becomes more difficult to form flutes, particularly at high speed.

The Variable Moisture Steam (VMS™) shower supply system can help precondition the medium and improve flute formation on single facers running at high-speeds.

Operation

The VMS shower supply system works by mixing steam with a controlled amount of water to supply a saturated vapor to the steam shower. This moisture-rich steam softens and plasticizes the fibers, allowing the single facer to form proper flutes at higher speeds.

Varying Moisture Level

A calibrated water flow valve allows the operator to vary the moisture level of the steam that supplies the steam shower, adjusting the flow to match the actual conditions of the medium.

Automatic Controls

Incorporated into the design are automatic controls to start and stop the steam flow in accordance with the single facer line speed. The VMS shower supply unit design prevents water slugging, which can cause a break-out of the medium. The VMS unit can also be used to supply conditioned steam for heating the liner and for the double facer belt showers.

File Downloads

Related

Steam Traps

Steam Traps

What is a Rotary Joint

and what are the different rotary joint types?

A rotary joint, also referred to as a rotary union or rotating union, is a rotary sealing device that connects rotating equipment to fixed piping for the transfer of steam, water, thermal oil, coolant, hydraulic oil, air, and other media. 

Transferring media without leaks requires the proper sealing technology. The sealing technology used depends on process speed, pressure, temperature, and media. 

Types of Sealing Technology

DuraSeal™ Elastomeric O-Ring Seals

  • Lighter duty applications

  • Work well at low speeds and temperatures

Balanced Mechanical Seals

  • Sealing force increases only slightly as pressure increases

  • Extended seal life and reduced torsional loads

Pressure Mechanical Seals

  • Heavy duty applications

  • Spring force and fluid pressure push a seal ring against a polished metal or ceramic surface

  • Sealing force and load increase with pressure

  • Rotary joints mount directly to a rotating shaft

Mounting Methods

Externally Supported

  • Mounted with a bracket, lug, or other external support

  • Robust to thrust, side, and torsional loading

  • Requires a mounting surface

pt2x rotary joint

Self-Supported

  • Mounts directly to a rotating shaft

  • Easily adaptable to install

  • Susceptible to side loading

  • Requires anti-torque rods or piping to prevent rotation

Learn more

  • The History of the Rotary Joint

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  • Seals: A Kadant Johnson Expertise that Assures Great Results

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  • Extending the Life of Rotary Joint Seal Rings

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