DSARV
DUAL SLURRY
AIR RELEASE VALVE
DUAL'S Air/Vacuum Release and Vacuum Breaker’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 pipeline 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.
FEATURES
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No blocking or leakage.
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No sticking due to rotating ball.
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Natural rubber secondary seal for positive seal.
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Fabricated and can be repaired in line.
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Self cleaning ball action.
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Cast body or fabricated.
APPLICATIONS
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Slurry pipelines.
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Deep well pumping.
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Waterlines.
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Sewage.
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Pump suction.
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Pump discharge.
SPECIFICATIONS
Size Range
50mm to 200mm.
Larger sizes available on request.
Operating Temperatures
Operating temperatures to 80˚C. Higher conditions are possible if the valve is constructed from suitable materials.
Valve Housing
Valve housing is Cast SG Iron, fabricated carbon steel or stainless steel (304 or 316).
Pressure Rating
Working pressure standards are 10 up to 160 Bar for Air release valves, and up to 25 Bar for combination valves for use of slurries.
Lining
Valve housing can be epoxy coated or natural rubber lined. A range of elastomer grades are available for corrosive duties.
Ball
Guided HDPE floating ball, solid Urethane of hollow stainless steel for high pressure.
Valve seat
Natural Rubber or stainless steel (304 or 316).
Drilling Patterns
ANSI B16.5, DIN, SABS & BS optional.
Material Certification
Certified chemical and physical test reports can be supplied.