Is the DIN 11851 end with GZ, notched tail, stainless steel, type DZK compatible with food-grade gaskets and CIP/SIP procedures?

Yes. The DIN 11851 end with GZ, notched tail, stainless steel, type DZK Format is compatible with foodâgrade gaskets and CIP/SIP procedures, given the provided characteristics: stainless steel construction, internal surface roughness Ra 0.8 Âµm (in the hole) which meets hygienic surface requirements, and design intended for the food and chemical industry. The couplingâs pressure and temperature limits (40 bar for DN10âDN40, 25 bar for DN50âDN100, 16 bar for DN125âDN150) mean it will withstand typical CIP/SIP pressures; actual compatibility with SIP temperatures depends on the gasket material selected. To ensure full compliance use certified foodâgrade elastomers (e.g., FDA/EC1935/2004 or appropriate EPDM/VMQ/FFKM grades) rated for the required CIP/SIP temperatures and chemicals, and verify gasket clamping and surface finish after assembly.

Can DIN 11851 end with GZ, notched tail, stainless steel, type DZK be used with food-grade gaskets and CIP/SIP at 40/25/16 bar?

Yes. DIN 11851 end with GZ, notched tail, stainless steel, type DZK Format can be used with food-grade gaskets and CIP/SIP at the stated pressures because the couplingâs maximum allowable working pressures per DIN 11851 match your values: 40 bar for DN10âDN40, 25 bar for DN50âDN100, and 16 bar for DN125âDN150. The stainless steel construction and Ra 0.8 Âµm (in the hole) suit food/chemical use. Ensure the gasket material is certified for food contact and rated for the CIP/SIP temperatures and chemicals used; gasket temperature limits determine allowable operating temperature. Also verify proper assembly, gasket compatibility with cleaning agents, and that the specific DN size falls within the corresponding pressure class.

Can DIN 11851 end with GZ, notched tail, stainless steel, type DZK be sterilized repeatedly without degrading gasket materials?

It depends on the gasket material; the DIN 11851 end with GZ, notched tail, stainless steel, type DZK body itself tolerates repeated sterilization, but gasket life depends on gasket type and sterilization method. Explanation: The stainless-steel DIN 11851 end with GZ, notched tail, stainless steel, type DZK is specified for food and chemical use with a surface finish Ra 0.8 Âµm and pressure ratings up to 40/25/16 bar depending on DN. Those metal parts withstand typical sterilization processes (steam, hot water, chemical sanitizers, and many dry-heat cycles) without material degradation. However, gaskets are polymeric and their resistance varies: - EPDM: excellent steam and hot-water resistance, good for repeated autoclaving/steam-in-place (SIP) at typical temperatures (121â134 Â°C) and for many CIP cycles; limited resistance to mineral oils and some aggressive chemicals. - PTFE (filled or virgin): outstanding chemical and temperature resistance; PTFE envelopes or full PTFE gaskets survive repeated sterilization and aggressive media, though pure PTFE may have sealing elasticity limitations unless designed appropriately (spring-energized or filled). - Silicone: good high-temperature flexibility and steam resistance but can age under repeated high-temperature sterilization and oxidative conditions faster than PTFE/EPDM. - NBR (nitrile): poor steam/steam-sterilization resistance; not recommended for repeated autoclaving. - FKM (Viton): good chemical and temperature resistance but variable long-term steam/autoclave performance; some grades tolerate sterilization, others degrade. Recommendation: To ensure repeated sterilization without gasket degradation for assemblies using DIN 11851 end with GZ, notched tail, stainless steel, type DZK, choose gasket materials rated for your sterilization method: - For frequent steam/SIP/autoclave: EPDM or PTFE (prefer PTFE designs that ensure sealing elasticity). - For aggressive chemicals/higher temperatures: PTFE (with appropriate spring or filler) or specific high-temperature elastomers qualified by manufacturer. - Always verify gasket manufacturer specifications for number of cycles, max temperature, and chemical compatibility. - Inspect gaskets regularly and follow accepted CIP/SIP procedures and temperatures. Replace gaskets per validated maintenance intervals to avoid failures.

DIN 11851 end with GZ, notched tail, stainless steel, type DZK

All products, Hygienic stainless steel couplings/

Additional information

Material	SS – stainless steel

DIN 11851 end with external thread Rd, with a knurled tail, Ra (in the hole) 0.8 µm, for use in the food and chemical industry. Maximum allowable working pressure (for the coupling itself according to DIN 11851): 40 bar (DN10÷DN40), 25 bar (DN50÷DN100), 16 bar (DN125÷DN150). Operating temperature: depending on the type of material used for the gasket. Material: stainless steel.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
NH-DZK-025	End. DIN 11851 corrugated DN25, Rd 52x1/6", hose 25 mm	25	40	In stock	Enquiry
NH-DZK-032	End. DIN 11851 corrugated DN32, Rd 58x1/6", hose 32 mm	32	40	In stock	Enquiry
NH-DZK-038	End. DIN 11851 corrugated DN38, Rd 65x1/6", hose 38 mm	38	40	In stock	Enquiry
NH-DZK-050	End. DIN 11851 corrugated DN50, Rd 78x1/6", hose 50 mm	50	40	In stock	Enquiry
NH-DZK-063	End. DIN 11851 corrugated DN63, Rd 95x1/6", hose 63 mm	65	25	In stock	Enquiry
NH-DZK-075	End. DIN 11851 corrugated DN75, Rd 110x1/4", hose 75 mm	75	25	In stock	Enquiry
NH-DZK-080	End. DIN 11851 corrugated DN80, Rd 110x1/4", hose 80 mm	80	25	In stock	Enquiry
NH-DZK-100	End. DIN 11851 corrugated DN100, Rd 130x1/4", hose 102 mm	100	25	In stock	Enquiry

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DIN 11851 end with external thread Rd, with a knurled tail, Ra (in the hole) 0.8 µm, for use in the food and chemical industry. Maximum allowable working pressure (for the coupling itself according to DIN 11851): 40 bar (DN10÷DN40), 25 bar (DN50÷DN100), 16 bar (DN125÷DN150). Operating temperature: depending on the type of material used for the gasket. Material: stainless steel.