Alfa Laval A49-42 Vacuum Breaker

Pasteurizing systems require a vacuum break at the high point of the process piping. This is done to ensure the pressure is never lowered by vacuum, which could cause a mixing of pasteurized and non-pasteurized products. Alfa Laval's A49-42 manual vacuum breakers provide a vaccum break in pasteurizing systems and other process lines, guarding against the contamination risks presented by vacuum conditions.

The A49-42 consists of a few simple components, allowing for years of reliable service. Manual vacuum breakers must be removed and cleaned separate from the system, just like a manual valve.

The A49-42 vacuum breaker is available with a two inch Tri-Clamp® connection.

  • Available in two inch Tri-Clamp® connection
  • Valve is positioned at the high point of the piping
  • Air enters as the vacuum pulls on the diaphragm
  • Not clean-in-place (CIP) capable, must be clean-out-of-place (COP)
  • 3-A compliant for manual cleaning

A49-42 valves' typical application is at the high point of a high-temperature short-time (HTST) pasteurization line to prevent siphon or back flow in the system.

Models A49-42 and B44MP vacuum breakers are designed for line service only. They are not intended for use on tanks or vessels.

Working Principle

Eqiupped with a diaphragm seal, the A49-42 prevents product loss during normal system operation. When the process line experiences a vacuum, the diaphragm is pushed away from the perforated sealing plate by atmospheric pressure, allowing air into the system to eliminate the vacuum conditions.

Standard Design

Model A49-42 is offered with a two inch Tri-Clamp connection only. It uses a diaphragm that seals against a perforated plate. The valve features a small bell hood on top to direct any product blow-by down towards the floor.

Product Wetted Parts316
Dimensional Data

Overall Height: 3.375 inches

Product Literature

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