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Brass inline spring check valve, 1-1/2 inch FNPT connections, lead-free finish

Campbell

Campbell 4033E 1-1/2" FNPT Brass Spring Check Valve

SKU CH-QKZP-A1JVB

Inline spring check valve in lead-free brass with FNPT connections, 0.5 psi cracking pressure, 25 gpm flow and 400 psi water rating

  • TypeOther
  • Prevents backflow with a 0.5 psi cracking pressure
  • Handles up to 25 gpm flow for demanding systems
  • Lead-free brass body meets potable water standards
  • Operates from 35 °F to 180 °F for versatile installations
  • Rated to 400 psi water pressure for reliable service

Campbell 4033E Spring Check Valve

This Campbell 4033E is a 1-1/2 inch FNPT inline spring check valve made from lead-free brass. It is suited for plumbing systems that need automatic backflow prevention in horizontal or vertical runs. The bronze seat and nitrile seal handle water up to 180 degrees F and 400 psi. Installers who want a compact, corrosion-resistant check valve for potable water lines will find it appropriate.

Nitrile Seal and Stainless Spring

The nitrile seal and stainless-steel spring are the only wear items inside the valve body. They replace the need for an external flap or swing mechanism, so the valve stays sealed at a cracking pressure of .5 psi and delivers a flow rate of 25 gpm. The bronze seat resists dezincification better than plain brass seats. No cartridge, solenoid or electronic controller is included or required.

FNPT Threads Simplify Installation

The valve connects with standard 1-1/2 inch FNPT threads on both ends, so it threads directly onto male pipe nipples without soldering or flanges. It mounts in any orientation, horizontal or vertical, which removes the alignment guesswork common with swing-check bodies. The most frequent issue is debris preventing the spring from reseating, so flush the line before final tightening. Do not use on steam lines; the valve carries no steam rating.

Highlights

  • Prevents backflow with a 0.5 psi cracking pressure
  • Handles up to 25 gpm flow for demanding systems
  • Lead-free brass body meets potable water standards
  • Operates from 35 °F to 180 °F for versatile installations
  • Rated to 400 psi water pressure for reliable service

Specifications

BrandCAMPBELL
TypeOther

Questions about this item

When will the nitrile seal and stainless-steel spring need replacement?

The nitrile seal and stainless-steel spring are wear items; inspect them annually and replace if leakage or reduced flow appears.

What pressure limit is reached first during continuous operation?

The valve is rated for 400 psi maximum water pressure; sustained flow at 25 gpm will hit that pressure ceiling before temperature limits.

How hot does the brass body get when water runs all day at 180 °F?

The brass body will approach the fluid temperature of 180 °F, so external surfaces become too hot to touch without insulation.

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