Pipeline ancillaries Air vents and air eliminators
10
Flange bolt hole tappings Size
ASME 150
ASME 300
JIS/KS 20
DN15
1/2 " - 13 UNC - 2B
1/2 " - 13 UNC - 2B
M12
DN20
1/2 " - 13 UNC - 2B
5/8 " - 11 UNC - 2B
M12
DN25
5/8 " - 11 UNC - 2B
5/8 " - 11 UNC - 2B
M16
Safety information, installation and maintenance Installation note:
The automatic air and gas vent must be fitted into a vertical pipeline above the point being vented with the direction of flow upward as indicated on the body so that the float mechanism is free to rise and fall in a vertical plane. The arrow on name-plate must point downwards. The low point of the cover is provided with a ½" tapping for a balance pipe which is essential for satisfactory operation. The balance pipe must be connected between the inlet pipe and the tapping provided on the cover as shown in the sketch below. As with all automatic air vents, dribbling may occur if the valve becomes fouled with dirt. For this reason it is recommended that a drip pipe is fitted to the outlet discharging to a safe place. Maintenance Servicing: With suitable isolation, repairs can be carried out with the vent in line. Undo cover studs and nuts and lift off cover. When reassembling make sure that all joint faces are clean. Always use a new gasket. Tighten cover studs and nuts uniformly. Open up isolating valve. Note: on reassembly make sure that the dowel is located into the body.
½" Balance pipe
How to order Example: 1 off Spirax Sarco DN20 AE44 automatic air and gas vent with steel body and Viton valve head flanged to EN 1092 PN40.
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TI-P149-08 CMGT Issue 10
Page 5 of 6
AE44 and AE44S Automatic Air and Gas Vents for Liquid Systems
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