Manual
X
X
Installation
ES-FV-4M1 0314 © Watts Regulator Company, 2003 Printed in U.S.A.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
Fig. 1 Fig. 2
*2.5 times pipe ID
ID = Inside Dimensions
*
*
Pipe
ID
Pipe
ID
Figure 1 shows the installation of the FV-4M1 for the venting of
air while the fluid is circulating in the system. The figure shows
the required increase in pipe size in order to obtain proper sepa-
ration of air from water. Watts Series AS Air Scoop which is
designed for efficient separation of air from water in hydronic
heating systems can also be installed. See Watts literature S-AS.
Figure 2 – When the FV-4M1 is installed as shown, the air will
not be vented while the fluid is circulating in the system, but it
can vent when the system is shut off.
The FV-4M1 should be mounted only in a vertical position as its
operation is based on the vertical movement of the float (see Fig. 3).
Note: In order to get the best results in venting air from risers,
use connecting pipes of at least
1
⁄
2" diameter between the “Float Vent” valves and the installation.
Maintenance
No maintenance is normally necessary.
However, if the FV-4M1 is disassem-
bled for inspection or cleaning it is
important that when re-assembling to
ensure that the spring loaded lever
properly engages under the float collar
(see reverse side).
Fig. 3
Fig. 4
Loosen 2 turns
for proper
venting
Operation: IMPORTANT!
After installing the FV-4M1, back off the small vent cap two turns (see Fig. 4). This is
the proper operating setting which will allow air to be vented from the system. It is
advisable to leave the cap on to prevent impurities from entering the valve.
Dimensions – Weights
A
D
C
B
E
A
D
C
B
E
F
1
/2" – 1"
1
/8" –
1
/4"
SIZE (DN) DIMENSIONS WEIGHT
ABCDEF
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kg
1
⁄8 32
15
⁄16 75 2
5
⁄8 67 1
5
⁄8 41
13
⁄16 21
5
⁄16 7.9
5
⁄16 7.9 .40 .18
1
⁄4 83
1
⁄8 79 2
5
⁄8 67 1
5
⁄8 41
13
⁄16 21
1
⁄8 3.1
1
⁄2 12.7 .43 .20
1
⁄2 15 3
5
⁄16 85 2
11
⁄16 69 1
1
⁄4 32
11
⁄16 18
5
⁄8 16 – – .44 .20
3
⁄4 20 3
3
⁄8 85 2
11
⁄16 69 1
1
⁄4 32
11
⁄16 18
5
⁄8 16 – – .45 .20
125 3
1
⁄2 89 2
11
⁄16 69 1
3
⁄8 35
11
⁄16 18
13
⁄16 20 – – .47 .21
*