Capacities

30

20

10

5

4

3

2

1

0.5

0.4

0.3

0.2

0.1

0.1

0.2 0.3 0.5

1

2 3 4 5

10

21

Differential pressure bar (x 100 = kPa)

Free air discharge capacity

If the temperature of the air differs from 15°C, the discharge

capacity from the graph can be corrected by multiplying it by the

following equation:

289

273 + T (T is the actual temperature)

It may be assumed that the temperature of the air is the same as

the temperature of the water.

Dimensions/weights (approximate) in mm and kg

Size

A

B

C

D

E

F

Weight

Installation

DN15

150

DN20

150

DN25

160

DN15 and DN20

A

DN25

A

80

80

115

80

215

80

225

85

282

D

120

120

170

155

10.8

165

10.8

215

15.0

Withdrawal

distance

Available spares

Soft valve cone AE44

Main valve assembly with float

Complete set of gaskets

Always order spares by using the description given in the column

headed 'Available spares' and state the size and type of automatic

air and gas vent.

7.12.28

Example: 1 - Main valve assembly for a Spirax Sarco DN20

AE44 automatic air vent.

Flange bolt hole tappings

3

2

Size

DN15

DN20

DN25

ASME 150

1⁄2" - 13 UNC - 2B

1⁄2" - 13 UNC - 2B

" - 11 UNC - 2B

JIS /KS 20

M12

M12

M16

TI-P149-08 ST Issue 7

AE44 and AE44S Automatic Air and Gas Vents for Liquid Systems

Pipeline ancillaries

Air vents and air eliminators

B

F

D

C

B

F

ASME 300

1⁄2" - 13 - UNC - 2B

" - 11 - UNC - 2B

" - 11 - UNC - 2B

Recommended tightening torques

E

C

(packet of 3 of each)

9

AE44 5, 6, 7, 8, 9, 15, 16, 17

AE44S

5, 6, 7, 8, 15, 16, 17

(packet of 3 sets)

3, 6

E Withdrawal

distance

Item

2

17

5

17

7

Cheesehead

or

mm

N m

19 - 21

50 - 55

2.5 - 2.8

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 1⁄2" 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.

C

a

p

a

c

i

t

y

d

m

3

/

s

a

̈

DN25 AE44S - 3.5 bar

DN25 AE44S - 5.3 bar

DN25 AE44S - 7.8 bar

DN25 AE44S - 16.7 bar

DN15/20 AE44

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.

DN15/20 AE44S - 21 bar

1⁄2" Balance pipe

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.

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.

Spare parts

The spare parts available are shown in solid outline. Parts drawn

in broken line are not supplied as spares.

* Note on reassembly make sure that the dowel is located into the body.

How to order spares

8

7 16 15 5176

*Dowel

Main valve assembly

with float (AE44S)

897 1615175 6

Main valve assembly

with float (AE44)

M10 x 60

M12 x 8

M5 x 20