DAV-MP-1-KA0 pages

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DAV-MP-1-KA
Combination Air-Valve
Metallic-Shield
This valve has been designed for efficient discharge and
intake of air in water pipelines, filtering systems, containers,
and other places where confined air could impair the
system’s operation.
The valve is designed for:
•t Discharge of high air-volumes during the initial filling of
the systems
•t Introducing large quantities of air when the pipe drains,
maintaining atmospheric pressure in the pipe and
preventing collapse and cavitation damage to the conduits
•t Relieving air from the water-filled system, while the
network is pressurized

•t

Properties:
Leak-proof sealing at all conditions, including low system
pressure. The aerodynamic design of the float provides air
flow at a very high velocity. The float does not close before
the water has reached the valve. Threaded outlet elbow
allows various possibilities of drain connection. The valve
design contains a very limited number of parts, allowing
easy dismantling for maintenance.

Operation:
The DAV-P-1-KA valve has three modes of operation:
•t Discharge of large volumes of air at a high flow velocity
when the conduit is being filled. When the water arrives to
the valve, the main float rises and closes the outlet.
•t Introduction of air into the pipeline when the internal
pressure is sub-atmospheric. The pressure differential

•t

and the gravity, force the main float to drop to “opened”
position, allowing the air to flow into the pipe.
Releasing air from the pressurized, water-filled pipeline.
Small quantities of air accumulate at high peaks of the
pipeline and in the body of the valve. The descending
water level allows the float to drop. At a certain position
the main float pulls down the small seal, that partially
opens the nozzle. The pressurized air can escape, the
water level rises and the nozzle re-closes.
Introduction of air into the pipeline when the internal
pressure is sub-atmospheric. The pressure difference and
the gravity, force the float to drop to “opened” position,
allowing large volumes of air to flow into the pipe.

Technical Specifications:
•t Operating pressure 0.2 to 25 bar
•t 1” BSP or NPT threaded base - as per the customer’s choice
•t Cover material: Cast Iron
•t Base Material: Brass
•t Internal parts: corrosion resistant, reinforced plastic
materials and synthetic rubber

•t The valve allows the discharge of over 220m3/h of air at a
pipe pressure of 1.0 bar, when fully-open

Principle of
operation:

Pipe is full of water

Pressurized air accumulated
in the valve, is released when
the float drops down

Pipe is aerated