Is the DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB compatible with fluids other than compressed air (e.g., water, oil)?

The DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB is primarily described for industrial use with compressed air, but its construction and materials indicate compatibility with several other fluids: - Suitable: Water and hydraulic oils that are chemically compatible with brass and NBR (nitrile) seals. The brass body and stainless steel internals resist corrosion and wear, and NBR seals handle many oils and aqueous fluids within the stated temperature range (-20°C to +100°C). - Limitations: NBR is not compatible with some aggressive chemicals, strong acids/alkalis, certain solvents (ketones, some chlorinated hydrocarbons), and petroleum products with additives incompatible with NBR. Extremely hot fluids above 100°C or pressures above 35 bar are also outside specification. - Recommendation: Verify chemical compatibility of the specific fluid with brass and NBR (seal) and ensure operating temperature/pressure remain within -20°C to +100°C and ≤35 bar. For aggressive fluids or applications requiring other seal materials, choose a coupling specified for those media (e.g., FKM/Viton or EPDM seals, or stainless-steel bodies).

Can the DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB be used with aggressive chemicals or solvents, and what material limitations should be considered?

DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB — suitability for aggressive chemicals/solvents and material limitations: - Base materials: brass body, stainless steel springs and balls, NBR (nitrile) seals. - Compatibility notes: - Brass: generally resistant to many oils, fuels and water-based media but can suffer dezincification or corrosion with strong acids, chlorides, ammonia, and some aggressive solvents (e.g., ketones, esters, chlorinated hydrocarbons). Not recommended for highly acidic, strongly oxidizing or halogenated solvents without verification. - Stainless steel internals: stainless steel offers good corrosion resistance but alloy grade matters; typical springs/balls resist many media but can be attacked by strong acids, chlorides at high concentrations/temperatures, or certain halide-containing solvents. - NBR seals: excellent for mineral oils, hydraulic fluids and many fuels; poor resistance to strong acids, ketones (acetone), some esters, chlorinated solvents, and aromatic hydrocarbons at elevated concentrations/temperatures. Temperature range -20°C to +100°C constrains use with very hot solvents or cryogenic applications. - Practical guidance: - For aggressive chemicals or solvents, consult chemical compatibility charts for brass and NBR (or request specific alloy/compound data from the manufacturer). - Consider alternative materials (e.g., stainless steel body, FKM/Viton, EPDM, PTFE seals) if media include strong acids, chlorinated solvents, ketones, or aromatics. - Verify operating temperature and pressure with the chosen media, and perform compatibility testing for concentrated or mixed chemicals. Conclusion: DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB is suitable for oils, fuels and many industrial fluids, but is not ideal for aggressive chemicals or harsh solvents without confirming compatibility due to brass and NBR limitations.

DN5 Brass Duplex Quick Release Coupling with Valve and Hose End, Series 21KB

All products, General-purpose low-pressure quick couplings/

Additional information

Material	B – brass (bronze)

The quick-release coupling plug series 21KB in Eurostandard DN5 (MINI) design with hose end offers a reliable double shut-off system, equipped with valves both in the socket and the plug, ensuring secure and leak-free connections. Engineered for industrial applications where compact dimensions are essential, it delivers excellent flow efficiency with minimal pressure loss, making it ideal for demanding environments. Its user-friendly one-handed operation enhances convenience and speed during frequent connections and disconnections. Built from durable brass with stainless steel springs and balls, it guarantees long-lasting performance and resistance to wear. The NBR sealing ensures tightness and reliability, while the wide operating temperature range from -20°C to +100°C allows for versatile use in various conditions. With a working pressure of up to 35 bar, this coupling plug combines safety, efficiency, and durability, making it a trusted solution for modern industry.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
RE-21SBTF06MPX	Quick coupling plug 21SB DN5, for hose 6 mm, brass, NBR	6	35	In stock	Enquiry
RE-21SBTF08MPX	Quick coupling plug 21SB DN5, for 8 mm hose, brass, NBR	8	35	In stock	Enquiry
RE-21SBTF10MPX	Quick coupling plug 21SB DN5, for hose 10 mm, brass, NBR	10	35	In stock	Enquiry

Do you need a larger quantity of products or a bespoke quote?

Call us: +91 8 925 918 796 or email us: chennai@tubes-international.com

SEND ENQUIRY

The quick-release coupling plug series 21KB in Eurostandard DN5 (MINI) design with hose end offers a reliable double shut-off system, equipped with valves both in the socket and the plug, ensuring secure and leak-free connections. Engineered for industrial applications where compact dimensions are essential, it delivers excellent flow efficiency with minimal pressure loss, making it ideal for demanding environments. Its user-friendly one-handed operation enhances convenience and speed during frequent connections and disconnections. Built from durable brass with stainless steel springs and balls, it guarantees long-lasting performance and resistance to wear. The NBR sealing ensures tightness and reliability, while the wide operating temperature range from -20°C to +100°C allows for versatile use in various conditions. With a working pressure of up to 35 bar, this coupling plug combines safety, efficiency, and durability, making it a trusted solution for modern industry.