Manual

ManualsBrandsWatts ManualsHydronic Radiant Heat1/8" Automatic Air Vent Valve

Series FV-4M1

Automatic Air Vent Valves

Sizes:

⁄8" – 1" (3 – 25mm)

Series FV-4M1 Automatic Air Vent Valves provide automatic air

venting 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

located at the top of the valve. Once the air is displaced and

the system pressure is sustained, the valve plug seals and pre-

vents 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 bars)

Temperature Range: 33˚F – 240˚F (5˚C – 116˚C)

For Hydronic Heating Applications

ES-FV-4M1

Job Name

–––––––––––––––––––––––––––––––––––––––––––

Contractor

––––––––––––––––––––––––––––––––––––––––––––

Job Location

–––––––––––––––––––––––––––––––––––––––––

Approval

–––––––––––––––––––––––––––––––––––––––––––––

Engineer

–––––––––––––––––––––––––––––––––––––––––––––

Contractor’s P.O. No.

–––––––––––––––––––––––––––––––––––

Approval

–––––––––––––––––––––––––––––––––––––––––––––

Representative

––––––––––––––––––––––––––––––––––––––––

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.

Vacuum

Breaker

Float

Specifications

Air vent shall have brass body & cover and silicone rubber

seal. Float shall be constructed of high temperature resistant

polyethylene and shall be for use with glycol systems. Air vent

shall be Watts Regulator Company 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"

" –

Summary of content (2 pages)

PAGE 1
ES-FV-4M1 For Hydronic Heating Applications Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––––––––––––––––––––––– Job Location ––––––––––––––––––––––––––––––––––––––––– Approval Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No.
PAGE 2
Installation Fig. 1 Fig. 2 * Pipe ID Pipe ID * *2.5 times pipe ID ID = Inside Dimensions * 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. 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 separation of air from water.