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Stainless steel inline check valve, 1/2 inch FNPT female threaded ends, 2.31 inches long

Apollo

Apollo 6210301 1/2" FNPT Stainless Steel Ball Cone Spring Check Valve

SKU CH-FMFR-B99KA

A 1/2" FNPT stainless steel ball cone spring check valve rated 400 psig CWP and 150 psi SWP with .5 psi cracking pressure, Cv 1.4, 316 stainless spring, RPTFE seat.

  • Stops reverse flow in air and steam lines with a spring-loaded ball cone check mechanism
  • Low .5 psi cracking pressure opens easily to keep pressure drop minimal
  • Stainless steel body and 316 stainless steel spring resist corrosion in harsh environments
  • Rated for 400 psig water and 150 psi steam across a 33 to 350 °F range
  • Compact 2.31 in length fits horizontal or vertical installations with FNPT threaded ends

Valve Type and Application

The Apollo 6210301 is a 1/2 inch FNPT stainless steel ball cone spring check valve designed for general purpose reverse flow prevention. It suits compressed air and steam service lines where reliable backflow protection is required. The inline two-way body provides a straight-through flow path to reduce pressure loss. Installers can mount it in horizontal or vertical positions.

Sustained Load Behaviour

The spring-loaded center-guided mechanism uses a 316 stainless steel spring to deliver fast seating action under continuous flow cycles. The RPTFE ball cone and seat maintain sealing integrity across the 33 to 350 degrees F operating temperature range. Maximum pressure ratings are 400 psig CWP and 150 psi SWP for steam, with a flow coefficient of 1.4 Cv and a low cracking pressure of .5 psi.

Installation Checks

Verify that your piping uses 1/2 inch FNPT female threads to match the valve connections. Confirm the system pressure does not exceed 400 psig CWP or 150 psi SWP and that media temperature stays within 33 to 350 degrees F. The overall length is 2.31 in and height is 1-1/8 in, so ensure adequate space in the line. The valve carries CRN registration.

Highlights

  • Stops reverse flow in air and steam lines with a spring-loaded ball cone check mechanism
  • Low .5 psi cracking pressure opens easily to keep pressure drop minimal
  • Stainless steel body and 316 stainless steel spring resist corrosion in harsh environments
  • Rated for 400 psig water and 150 psi steam across a 33 to 350 °F range
  • Compact 2.31 in length fits horizontal or vertical installations with FNPT threaded ends

Specifications

BrandAPOLLO VALVES

Questions about this item

How much heat does the 6210301 handle when it runs all day in steam service?

The valve operates from 33 to 350 degrees F, so it stays within spec during continuous steam use up to the 150 psi SWP limit.

What piping must I already have to install the 1/2 in FNPT ends?

You need 1/2 inch female NPT threads on both sides of the line; the valve threads directly onto those connections.

Will the .5 psi cracking pressure work with older low-pressure air lines?

Yes, the .5 psi opening pressure lets the valve seat quickly even on older compressed-air systems that run at modest pressure.

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