Submittal Sheet

ManualsBrandsWatts ManualsAir Valves3/4" FV-4M1 Auto Air Vent

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"

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 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 polyeth-

ylene 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.

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.

The information contained herein is not intended to replace the full

product installation and safety information available or the experience

of a trained product installer. You are required to thoroughly read all

installation instructions and product safety information before begin-

ning the installation of this product.

NOTICE

/2" – 1"

Summary of content (2 pages)

PAGE 1
ES-FV4-M1 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 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. 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. X Fig.