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Apollo forged brass backflow valve, 1/2 inch FNPT connections, inline dual-check design with vent

Apollo

Apollo 4ALF4A33AM Backflow Valve Forged Brass 1/2" FNPT

SKU CH-5V2W-X5NXY

Forged brass inline check valve with dual flow design and vent, EPDM seals, 1/2 inch FNPT connections, rated 175 psi water and 125 psi steam from 33 to 180 degrees F

  • Forged brass body resists corrosion for long service life
  • Dual check design with vent prevents backflow in irrigation systems
  • EPDM seals handle water from 33 to 180 degrees Fahrenheit
  • Rated for 175 psi water and 125 psi steam pressure
  • 1/2 inch FNPT connections install inline without special tools

Apollo 4ALF4A33AM Backflow Valve

This Apollo 4ALF4A33AM is a forged brass backflow valve with a 1/2 inch FNPT x FNPT connection. It uses a dual check design with vent for inline installation. The body and seat are brass and EPDM rated for water up to 175 psi and steam up to 125 psi WSP.

Suits horizontal potable lines needing vented dual

Installers needing vertical mounting or a different pipe diameter should look elsewhere. Systems requiring pressure ratings above 175 psi water or 125 psi steam cannot use this valve. Applications outside the 33 to 180 degree F range need alternative components.

Fits 1/2 inch NPT threaded piping in horizontal runs

The inline body connects directly to matching FNPT fittings without adapters. EPDM seals handle the stated temperature and pressure range without additional gaskets. The vented dual-check mechanism provides backflow protection while freeing up space compared to separate device assemblies.

Highlights

  • Forged brass body resists corrosion for long service life
  • Dual check design with vent prevents backflow in irrigation systems
  • EPDM seals handle water from 33 to 180 degrees Fahrenheit
  • Rated for 175 psi water and 125 psi steam pressure
  • 1/2 inch FNPT connections install inline without special tools

Specifications

BrandAPOLLO

Questions about this item

What piping must I already have to connect this 1/2" FNPT backflow valve?

You need 1/2" male NPT threads on both sides of the installation point so the valve's female connections can screw directly onto them.

Will this valve handle the 175 psi water pressure in my existing irrigation main?

Yes, the valve is rated for a maximum water pressure of 175 psi, matching that supply pressure.

How can I confirm the valve is sealing properly after installation?

Pressurise the line up to 175 psi and verify no water passes through the vent when the downstream outlet is closed.

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