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Small stainless steel inline check valve with FNPT ends

Apollo

Apollo 6210101 1/4" FNPT Stainless Steel Ball Cone Spring Check Valve

SKU CH-DXF1-JKG9J

Inline ball-cone check valve with stainless-steel body, 1/4" FNPT ends, 0.5 psi cracking pressure and EPDM seals rated to 180 °F and 400 psi water

  • Stainless-steel body resists corrosion in demanding plumbing systems
  • 400 psi water-pressure rating handles high-pressure lines
  • Spring-assisted ball-cone design prevents backflow at 0.5 psi cracking pressure
  • EPDM seals and RPTFE seat operate from 33 °F to 180 °F
  • Mounts horizontally or vertically for flexible installation

Apollo 6210101 Check Valve Overview

The Apollo 6210101 is a 1/4 inch FNPT stainless steel ball cone spring check valve built for plumbing and fluid-control systems. Its inline design uses a spring-loaded ball cone to stop reverse flow while allowing forward movement in horizontal or vertical runs. The body and spring are stainless steel with an RPTFE seat and EPDM seals for chemical compatibility. It suits installers and maintenance crews who need a compact, corrosion-resistant non-return valve for water or steam lines.

Before Ordering Verify Compatibility

Confirm the pipe thread is 1/4 inch FNPT on both ports so the valve threads directly into existing fittings without adapters. Check that the system pressure stays at or below 400 psi for water and 150 psi for steam service. Ensure the fluid temperature will remain between 33 and 180 degrees Fahrenheit so the EPDM seals and RPTFE seat stay within their rated range. Verify the cracking pressure of 0.5 psi matches the minimum head pressure available to open the valve reliably.

Installation and System Fit

The valve installs inline between two female NPT fittings and operates in any orientation, freeing layout choices in tight pipe runs. Its stainless steel construction resists corrosion, reducing the need for frequent replacement in aggressive water or steam service. The spring-loaded ball cone closes automatically when flow stops, protecting downstream equipment from backflow without external power or control signals. The compact 1/4 inch size lets it fit into existing manifolds or branch lines where larger check valves would not clear.

Highlights

  • Stainless-steel body resists corrosion in demanding plumbing systems
  • 400 psi water-pressure rating handles high-pressure lines
  • Spring-assisted ball-cone design prevents backflow at 0.5 psi cracking pressure
  • EPDM seals and RPTFE seat operate from 33 °F to 180 °F
  • Mounts horizontally or vertically for flexible installation

Specifications

BrandAPOLLO VALVES

Questions about this item

Does the Apollo 6210101 check valve include any fittings, sealant or tools in the package?

The valve is supplied as a single unit with FNPT threads on both ends; pipe nipples, thread sealant and installation tools must be purchased separately.

Should I select a different cracking-pressure version or a larger pipe size for my system?

This model is fixed at 0.5 psi cracking pressure and 1/4 inch FNPT connections; other pressures or sizes would require a different Apollo part number.

What does the 400 psi water-pressure rating mean when the valve is installed in a hot-water line?

The 400 psi rating applies up to the maximum service temperature of 180 °F; above that temperature the allowable pressure drops and the 150 psi steam limit governs.

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