D-43 | Combination Air Valve PRO


  • Product Catalog:
  • Product Drawings:
  • Install & Maintenance:
2” – 10 bar 3”- 8” – 16 bar


The D-43 series Combination Air Valve has the features of both an air release valve and an air & vacuum valve. The air release component is designed to automatically release small pockets of air to the atmosphere as they accumulate along a pipeline or piping system when it is full and operating under pressure. The air & vacuum component is designed to automatically discharge or admit large volumes of air during the filling or draining of a pipeline or piping system. This valve will open to relieve negative pressures whenever water column separation occurs.

Product Features

  • Combines the features of both an air & vacuum valve and an air release valve.
  • Triple function: 
    • Air & vacuum component discharges large volumes of air during filling of the system.
    • Air & vacuum component admits large volumes of air during drainage and at water column separation.
    • The air release component releases entrapped air in pressurized systems.
  • Dynamic design allows for high velocity air discharge while preventing premature closure.
  • Simple and reliable structure , small dimensions, lightweight.
  • Available in sizes: 2" threaded male or female BSPT/NPT connections, BSP,NPT. Sizes 3" – 6" are manufactured with flanged ends to meet various requested standards.

Materials and Corrosion Protection

  • 2" - The body is made of high-strength composite materials
  • 3" – 8" The body is made of Ductile Iron.
  • All operating parts are made of specially selected, corrosion- resistant materials.

Application Range

  • Working pressure range:
    • 2” – 10 bar
    • 3”- 8” – 16 bar
  • Maximum operating temperature: 60°C.
  • Maximum intermittent temperature: 90° C.
  • For installation:
    • At pump stations.
    • Downstream and upstream of shut-off valves After deep-well pumps.
    • On long constant-sloped pipeline segments.
    • At peaks along the pipeline and at peaks relative to hydraulic gradient.
    • Additional protective shell for anti-vandalism/theft applications.


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Last Updated on: Monday, 09 January 2023