Caleffi 573017A Backflow Preventer and AutoFill Combination 1/2" Press x FPT W/Gauge
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Caleffi 573017A

Caleffi 573007A Backflow Preventer & AutoFill Combination Press x NPT 1/2"
AutoFill. Automatic filling valve with backflow preventer Pre-adjustable automatic filling valve with backflow preventer. Inlet Connection: 1/2" FNPT, union. Outlet Connection: 1/2" FNPT. Maximum operating pressure: 175 psi. Maximum upstream pressure: 175 psi. Medium temperature range: 40150 °F. Setting: 15 psi. Pressure setting: 15 psi. Adjustment pressure range: 360 psi. Pressure gauge scale: 060 psi. Material: brass.

Caleffi 573007A

Caleffi 573019A Backflow Preventer & AutoFill Combination W/Pressure Gauge

Caleffi 573019A

Caleffi 573012A Backflow Preventer and AutoFill Combination 1/2" FPT W/Gauge

Caleffi 573012A

Caleffi 551004A Automatic Air Vent High Performance 1/2" NPT
DISCALAIR automatic air vents release air that forms in the hydraulic circuits of heating and air conditioning systems, with pressures to 150 psi. The venting air discharge capacity is very high, capable of discharging over 4 standard cubic feet per minute (SCFM). The circulation of fully de-aerated water or glycol-water fluids enables the equipment to operate under optimum conditions, free from noise, corrosion, localized overheating or mechanical damage.

Caleffi 551004A

Caleffi 551028A Air Separator 1" Sweat DISCAL
The DISCAL air separator is used to continuously remove the air contained in the hydronic circuits of heating and cooling systems. The air discharge capacity of these devices is very high. They are capable of removing automatically all the air present in the system down to micro-bubble level. The circulation of fully de-aerated water enables the equipment to operate under optimum conditions, free from any noise, corrosion, localized overheating or mechanical damage. Micro-bubbles, fusing with each other, increase in volume (get larger) until they become large enough to rise to the top where they are automatically released.

Caleffi 551028A

Series DuoVent High Capacity Air Vents with Manual Vent Feature are used in commercial and residential hydronic heating applications to provide automatic air venting for hot or cold water distribution systems. It consists of a brass body construction with female NPT connection, brass cover, air vent with silicone rubber seal, shutter, polyethylene float with valve plug, automatic vent with black cap, and manual vent with red cap. Series DuoVent has a high capacity and high temperature rating and is ideal for use with glycol systems or for use as an anti-vacuum device. Can be disassembled for inspection and cleaning.

• 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
• With manual vent feature

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Watts Water 590719

Caleffi 573403A Dual Check Backflow Preventer W/Atmospheric Vent 1/2" NPT
Dual check backflow preventer with atmospheric vent
Dual union for easy servicing and testing Protects potable water systems from backflow of contaminated fluids
Technical data

Maximum operating pressure: 175 psi

Medium temperature range: 32  210 °F

Material: DZR low lead brass

Caleffi 573403A

The HAV valve utilizes moisture retaining discs within the body which vary in volume when they change from a wet to a dry condition. As the discs dry, they allow air to escape from the system and when wet, provide a positive shut-off.

• Automatic or manual operation
• Quick venting design
• Positive shut-off ball check
• Heat resistant hand wheel
• Simple two piece construction
• Non adjustable
• Straight mount
• Straight body style

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Watts Water 590712

Caleffi 553549A AutoFill Filling Valve 1/2" Sweat x NPT
The automatic filling valve is a device consisting of a pressure reducing valve with compensating seat, visual system pressure setting indicator, an inlet filter, anti-scale internal parts, a shut-off valve and a check valve. It is installed on the water inlet piping in sealed heating systems, and its main function is to maintain the pressure of the system stable at a set value, automatically filling up with water as required. This valve has been designed as pre-adjustable, which means that it can be adjusted at the required pressure value before the system charging phase. After installation, during the filling or topping-off phase, the water feed will stop when the set pressure is reached filling 50% faster than other valves. There are no levers to flip or valve to close. Pre-assembled with the 573 series backflow preventer, the AutoFill Combo features an atmospheric vent which is designed to protect drinking water systems from return flow, caused by back-siphoning or back pressure, of contaminated fluids. The 573 series has been specifically certified to standards CSA B64.3 and ASSE 1012.

Caleffi 553549A

Features

Seat located above drain so that water is never trapped and sediment never fouls the seat

Nonmechanical seat-to-disc alignment that does not stick or freeze

Water seal of high temperature resisting material to isolate spring working parts from water during relief*

Nonmetallic disc-to-metal seating

Available in diameters from 34" to 2"

Optional SentryPlus Alert discharge line flood sensor which when paired with a connection kit (sold separately) can detect excessive water discharges from the relief valve (Refer to ES-FS-ReliefValve.)

Watts Water 740-030-FS-3/4

VentRite 75VT Brass Non-Adjustable Air Valve, 3/4 x 1/2", Male x Female

• All vents are factory assembled, tested and inspected in the USA
• Each vent is individually packed with External labeling for convenience and maintenance
• Our vents have all brass internals with nickel plated and hand polished exterior
• Every Vent-Rite vent is factory assembled, tested and inspected in the USA

Sid Harvey Item #:75VT: Replaces Part #:'s : 2K903
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Vent-Rite Corporation 75VT