Watts FV-4 - Manual

For Hydronic Heating Applications
ES-FV4-M1
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Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
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Series FV-4M1
Automatic Air Vent Valves
Sizes: 1 ⁄
8
" – 1" (3 – 25mm)
Series FV-4M1 Automatic Air Vent Valves provide automatic air vent-
ing for hot or cold water distribution systems. These vents purge air
that may be in the water system.
The vent valve utilizes a float to actuate the valve plug which is locat-
ed at the top of the valve. Once the air is displaced and the system
pressure is sustained, the valve plug seals and prevents any water
from escaping from the system.
The float vent can also operate as an anti-vacuum device since it will
permit air to enter the system when it must be drained. It can also
be installed to permit the separation and dispersal of air while fluid is
actually circulating in the system.
Features
• Body and cover are brass construction
• Air vent with silicone rubber seal
• Impurities do not usually affect function as maximum float line of
water is always lower than the valve seal
• Float is high temperature resistant polyethylene
• Suitable for use with glycol systems
• Can be disassembled for inspection and cleaning
Pressure – Temperature
Minimum working pressure: 1.45psi (10 kPa)
Maximum working pressure: 150psi (10 bar)
Temperature Range: 33˚F – 240˚F (5˚C – 116˚C)
Specifications
Air vent shall have brass body & cover and silicone rubber seal.
Float shall be constructed of high temperature resistant polyethyl-
ene and shall be for use with glycol systems. Air vent shall be Watts
Series FV-4M1.
Venting Air
Float
Silicone
Seal
Float
Collar
Spring Loaded
Lever
(Air)
Vacuum
Breaker
Diagram above shows the quantity of air vented by the “Float Vent”
according to the pressure in the system.
1 /
2
" – 1"
Vacuum
Breaker
Float
1 /
8
" – 1 /
4
"
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.