‘s Air / Vacuum Valve’s function is to
automatically exhaust large volumes of air from the
system when it is being filled and also to allow air to
re-enter the pipe line when being emptied. The orifice
size is generally the same size as the valve inlet and
outlet.
In Operation, when the system is filled, the fluid lifts the
ball until it closes the orifice. The orifice will remain
closed until the system is emptied. Air may enter the
valve and displace the fluid while the system is in
operation, however, internal pressure will continue to
hold the valve closed. The valve will not re-open until
the system pressure drops to near atmospheric
pressure and the ball is no longer buoyant.

• No blocking or leakage.
• No sticking due to rotating ball.
• Linatex secondary seal for positive seal.
• Fabricated and can be repaired in line.
• Self cleaning ball action.

• Valve housing is fabricated from carbon steel or
  stainless steel (304 or 316).
• Valve housing can be epoxy coated.
• Valve housing can be natural rubber lined. A Range
  of elastomer grades are available for corrosive
  duties.
• Guided urethane floating ball, solid urethane or
  hollow stainless steel for high pressure.
• The seat is made of linatex rubber low pressure sealing and for sealing in slurry.
• Flanges are typically made of carbon steel or
  stainless steel and drilled to customer requirements.
• Working pressure standards are 10 up to 100 bar for air release valves, and up to 16bar for combination valves for use on slurries.
• Operating temperatures to 80°C. Higher conditions
  are possible if the valve is constructed from suitable
  materials.