Vacuum Breaker Air Valves

For critical applications where vacuum protection is a must or where column separation is predicated, a vacuum breaker is used. The Vacuum Breaker is mounted at critical pipeline high points, penstocks, or tanks and allows for rapid inflow of atmospheric air to reduce vacuum conditions in piping systems.

Product Overview

  • Available in sizes 1/2" - 42"
  • Available in sizes 3" - 42" with Optional Air Release Valve
  • Cushions surges related to column separation
  • Opens in response to a 0.25 psi vacuum
  • Manufactured under a certified ISO 9001 quality system
  • Automated Sizing Program

Certifications

Features

  • Full flow areas provide maximum vacuum protection for pipelines and tanks
  • Resilient seals provide drop tight seating
  • Connections for optional air release valve - to vent entrained air
  • Available with optional inflow preventer
  • Available with optional screened hood

Specifications

Valve Size Product Description Drawing Number
1/2" - 3" 100VB Vacuum Breaker VM-100VB-S
2" - 42" 1800VB Vacuum Breaker VM-1800VB-S

Materials of Construction

Valve Size Product Description Drawing Number
1/2" - 3" 100VB Vacuum Breaker VM-100VB-M
2 1/2"- 12" 1800AVB.1 Vacuum Breaker (Lead Free) VM-1800AVB.1-M
14" - 42" 1800VB.1 Vacuum Breaker (Lead Free) VM-1814VB.1-M
2 1/2" - 42" 1800VBS Wastewater Vacuum Breaker - ANSI Class 125 VM-1800VBS-M
2" - 30" 1850VBS Wastewater Vacuum Breaker - ANSI Class 250 VM-1850VBS-M

Dimensions

Valve Size Product Description Drawing Number CAD Version
1/2" - 3" 100VB Vacuum Breaker VM-100VB
2" - 12" 1800AVB Vacuum Breaker - ANSI Class 125/250 VMC-1800AVB CAD-1800AVB
14" - 42" 1800AVB Vacuum Breaker - ANSI Class 125/250 VMC-1814VB CAD-1814VB
2" - 12" 1800AVBS Wastewater Vacuum Breaker - ANSI Class 125/250 VMC-1800AVBS CAD-1800AVBS
3" - 12" 1800VB Vacuum Breaker with Air Release Valve - ANSI Class 125/250 VMC-1800AVB/38 CAD-1800AVB/38

Manuals

Valve Size Product Description Drawing Number
1/2" - 3" Vacuum Breaker - Threaded VB-OM2
2" - 42" Vacuum Breaker - Flanged VB-OM1

Technical Data

Product Description Drawing Number
Theory, Application and Sizing of Air Valves White Paper
Application Chart Chart
Flow Capacity Graph SS-1971
Venting Capacity for Threaded Vacuum Breakers SS-2459
Flange & Gasket Installation Requirements SS-1381

Brochures