For Hydronic Heating Applications

ES-FV4-M1

Job Name

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

Contractor

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

Job Location

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

Approval

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

Engineer

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

Contractor’s P.O. No.

––––––––––––––––––––––––––––––––––

Approval

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

Representative

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

Series FV-4M1

Automatic Air Vent Valves

Sizes:

⁄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.

/2" – 1"

Vacuum

Breaker

Float

/8" –

/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.

1 2

Summary of Contents

Page 1 - Series FV-4M1

For Hydronic Heating ApplicationsES-FV4-M1Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor –––––––––––––––––––––––––––––––––––––––

Page 2 - A B C D E F

InstallationFig. 2*2.5 times pipe IDID = Inside Dimensions**Pipe IDPipe IDFigure 1 shows the installation of the FV-4M1 for the venting of air while t

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