6A Air Vent

6A Air Vent
INSTALLATION AND MAINTENANCE INSTRUCTIONS
May 2004
IMI 4.008
6A Air Vent
The 6A Air Vent has both a float and a thermostatic
bellows for use where air, condensate and steam may
be present (as in one pipe steam heating systems.)
The 6A will discharge air, while preventing the escape
of either condensate or steam. An outlet check valve
prevents the re-entry of air.
6
7
9
6
5
Limiting Operating Conditions
Max. Operating Pressure (PMO)
1
15 psig (1 barg)
10
Complete rebuild of all internals
(except float) element set #3
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Remove 6Aunit from pipe work.
Loosen inlet cap #2 and remove from body.
Remove thermostatic element #3-4 and discard.
Remove valve head #5 from float #10.
Loosen sealing nut #9.
Remove valve seat #6 from body.
Remove spring clip #8 from valve seat #6 and remove ball
valve #7.
Thread new thermostatic element #3-4 into cap, torque to
12-15 ft-lbs.
Assemble new valve head #5 to float #10, snug up (do not
over tighten).
Thread new valve seat fitting #6 into body #1 a few turns
Back sealing ring #9 off so it doesn’t bind on body.
Holding 6Awith valve seat fitting down. Take float/valve head
assembly and place it in side the body. Make sure the valve
head #5 slides into valve seat fitting #6.
Thread cap assembly with thermostat on to body and torque
to 110-120 ft-lbs.
Turn valve seat fitting #6 clockwise until head and seat touch.
(note: do not turn tight, which will compress thermostat)
With valve head #5 touching the seat #6 (valve closed). Back
off valve seat fitting 1-1/4 turns which will give you a travel
of .078".
Hold valve seat fitting in position and tighten sealing ring #9.
3
4
2
Spare Parts
Element Set*
Element
Seat & Gasket
Float
4& 5
3
3A
4&5
6
3
* Part No. 3 Element Set
converts Type 6T Air Vent
to current Type 6A design.
6
3A
Installation
The air vent should be positioned with the inlet at the bottom at the
highest point in the piping system or equipment where air collects.
The valve will be closed when either condensate or steam enters
the body. The discharge can be hot and wet, and the 6Ashould be
positioned accordingly.
Spirax Sarco Applications Engineering Department
Toll Free at:
1-800-833-3246
SPIRAX SARCO, INC. • 1150 NORTHPOINT BLVD. • BLYTHEWOOD, SC 29016
PHONE 803-714-2000 • Fax 803-714-2222
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