Hongjie manufactures custom O-rings for seat, stem, bonnet, and body sealing across ball, gate, check, and control valves, supplying OEM valve builders and MRO buyers in oil & gas, water treatment, HVAC, and process industries — from AS568A stock sizes to fully custom profiles.
Valve O-rings serve different functions depending on their location:
Each O-ring is molded according to the groove geometry and duty cycle. For standard sizes, see AS568 O-rings by dash size.
Material selection should follow the valve media, temperature and motion requirements:
| Compound | Temp Range* | Durometer (Shore A)* | Key Limitation |
|---|---|---|---|
| NBR | −30°C to +120°C | 40–90 | Weak vs ozone/UV |
| FKM (Viton) | −20°C to +200°C | 50–90 | Fails in steam >150°C |
| EPDM | −50°C to +150°C | 40–90 | Swells in petroleum oils |
| Silicone (VMQ) | −60°C to +200°C | 30–80 | Low tear resistance |
*Typical grade ranges. Hongjie's full compound range spans −60°C to +325°C, resistance-tested against 500+ fluids and chemicals.
Engineering review, certified quality systems and material compliance support consistent valve O-ring production.
Critical features from 0–10 mm can be held to ±0.02 mm on the precision tier.
Standard AS568A and metric sizes are supported through a library of 3,500+ existing O-ring tools.
A team of 25+ engineers reviews groove and gland fit using 3D CAD and FEA before tooling.
IATF 16949:2016 and ISO 13485:2016 certifications support automotive and medical valve programs.
FDA- and NSF-compliant compounds are available for potable-water and food-contact valve applications.
MOQ, tooling lead time and sample cost depend on the part geometry and are confirmed during the quote review.
Send a drawing and get a functional prototype in 3–5 business days, with mold and tooling support carried through to mass production via custom O-rings from drawings & samples. Ready to spec a part? Start a project discussion.
Valve O-rings from Hongjie run in oil & gas, water treatment, HVAC, medical/pharma, and general industrial process lines. Medical valve builds also source medical rubber parts for surrounding assemblies, and plumbing systems draw on rubber parts for plumbing systems for fittings beyond the valve.
For potable-water fittings, valves and faucets, see plumbing O-rings in FDA/NSF-compliant compounds.
Explore complementary sealing solutions from our comprehensive product catalog.
