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Brass inline spring check valve with FNPT connections, black polypropylene components

Campbell

Campbell 4034E 2" FNPT brass spring check valve .5 psi 30 gpm

SKU CH-NXS7-1S27R

A 2" FNPT brass spring check valve with .5 psi cracking pressure and 30 gpm flow capacity

  • Lead-free brass construction prevents contamination in potable water systems
  • 5 psi cracking pressure allows flow with minimal system pressure
  • Spring-loaded inline design operates in horizontal or vertical mounting
  • Nitrile seals perform from 35 °F to 180 °F for hot and cold lines
  • 30 gpm flow capacity at 400 psi maximum water pressure

2" FNPT Brass Spring Check Valve

The Campbell 4034E is a lead-free brass inline spring check valve with 2-inch FNPT connections. It is suited for plumbing and hydronic systems that require automatic back-flow prevention in horizontal or vertical runs.

.5 psi cracking pressure and 30 gpm flow

The valve opens at a low .5 psi cracking pressure and passes up to 30 gpm of water. It handles water pressure to 400 psi and temperatures from 35 to 180 degrees F, but it is not rated for steam service.

Replaces worn swing or lift check valves

The spring-loaded design closes quickly without gravity dependence, reducing water hammer where a swing check has become noisy. The bronze seat and nitrile seal resist wear in potable-water loops, so the upgrade is worthwhile when an older valve leaks by or chatters.

How it compares

Measured against everything we stock in Faucet Valves & Replacement Parts, at today’s prices. Recalculated every night.

Price $124.99
Pricier than about 69% of the 1,132 comparable items (median $54.99).

Specifications

Product
Brand nameCAMPBELL
Product typeOther

Questions about this item

Will the 0.5 psi cracking pressure let this valve work with my existing low-head gravity tank?

The spring opens at 0.5 psi, so even a modest gravity head will overcome it and allow flow through the 2 inch FNPT connections.

How can I confirm the valve is sealing properly after I thread it into the line?

Pressurise the system up to 400 psi water pressure; no downstream flow should appear until inlet pressure exceeds the 0.5 psi cracking point.

Does the box include flange gaskets or pipe dope for the 2 inch FNPT threads?

The valve ships with nitrile seals already seated in the bronze seats; thread sealant or gaskets for the FNPT joints are not included.

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