Is the Hydraulic two-way valve with metric external thread, type SKH L/S suitable for continuous operation at -30Â°C given POM and NBR seal temperature limits?

No. Hydraulic two-way valve with metric external thread, type SKH L/S is not suitable for continuous operation at â30Â°C because one of its seals (NBR for the stem) has a lower operating limit of â20Â°C. Although the POM ball seal is rated down to â40Â°C, the NBR will become hard and lose elasticity below â20Â°C, risking leakage, impaired sealing performance and possible mechanical damage under continuous low-temperature stress. For continuous service at â30Â°C you need seals specified for that temperature (e.g., FKM, HNBR, or approved low-temperature NBR grades) or a valve variant rated for â30Â°C or lower.

Can Hydraulic two-way valve with metric external thread, type SKH L/S be used with fluids that degrade POM or NBR at high temperature?

Hydraulic two-way valve with metric external thread, type SKH L/S should not be used with fluids that are known to degrade POM (polyoxymethylene) or NBR (nitrile rubber) at elevated temperatures. The valveâs seals are POM (ball) and NBR (stem), and its rated operating temperature range for those materials is up to +100Â°C. If a fluid chemically attacks POM or NBR, especially at high temperature, seal failure, leakage and premature valve damage are likely. Use a compatible fluid or select a valve with chemically resistant seal materials (e.g., PTFE, FKM) rated for the required temperature and pressure.

Can the Hydraulic two-way valve with metric external thread, type SKH L/S be used with abrasive hydraulic fluids?

Hydraulic two-way valve with metric external thread, type SKH L/S is not recommended for use with abrasive hydraulic fluids. Powody: - MateriaÅy uszczelnieÅ: Valve uses POM (ball) and NBR (stem) seals. Oba materiaÅy sÄ stosunkowo odporne na standardowe oleje hydrauliczne, ale sÄ wraÅ¼liwe na Åcierne czÄstki. Abrasive contaminants powodujÄ szybsze zuÅ¼ycie powierzchni uszczelniajÄcych, nieszczelnoÅci i skrÃ³cenie Å¼ywotnoÅci. - Elementy metalowe: Body, ball i stem wykonane ze stali zapewniajÄ wytrzymaÅoÅÄ mechanicznÄ, lecz stal bez dodatkowych powÅok i specjalnych materiaÅÃ³w powierzchniowych nie chroni przed erozjÄ i rysowaniem spowodowanym czÄstkami Åciernymi. Erozja kulki i gniazda prowadzi do utraty szczelnoÅci i trudnoÅci w obsÅudze. - Temperaturowe ograniczenia materiaÅÃ³w: Zakres temperaturowy POM (-40Â°C do +100Â°C) i NBR (-20Â°C do +100Â°C) dotyczy stabilnoÅci materiaÅÃ³w, ale nie odnosi siÄ do odpornoÅci na mechaniczne Åcieranie spowodowane zanieczyszczeniami. JeÅli system pracuje z pÅynami zawierajÄcymi czÄstki Åcierne, rozwaÅ¼: - stosowanie filtracji o wysokiej skutecznoÅci (niÅ¼sza dopuszczalna zawartoÅÄ czÄstek), - urzÄdzeÅ zaprojektowanych specjalnie do mediÃ³w abrazyjnych (uszczelnienia i materiaÅy odporne na Åcieranie, np. specjalne powÅoki, twardsze i bardziej odporne elastomery), - regularnej inspekcji i konserwacji komponentu. Podsumowanie: Hydraulic two-way valve with metric external thread, type SKH L/S nie jest optymalnym wyborem do pracy z abrazjnymi hydraulicznymi pÅynami bez dodatkowych ÅrodkÃ³w ochronnych (filtracja, specjalne materiaÅy/powÅoki).

Hydraulic two-way valve with metric external thread, type SKH L/S

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Additional information

Material	CS – steel (cast iron)

High-quality two-way ball valve type SKH L/S with external metric thread, DIN 2353, designed for high-pressure hydraulic installations. Material: steel (body, ball, stem). Seals: POM (ball), NBR (stem). Operating temperature: from -40°C to +100°C (POM); from -20°C to +100°C (NBR).

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
HZ-SKH-35L	Two-way valve DN32 with GZ M45x2, POM/NBR, lightweight	32	400
HZ-SKH-38S	Two-way valve DN32 with GZ M52x2, POM/NBR, heavy	32	400
HZ-SKH-42L	Two-way valve DN40 with GZ M52x2, POM/NBR, lightweight	40	400

High-quality two-way ball valve type SKH L/S with external metric thread, DIN 2353, designed for high-pressure hydraulic installations. Material: steel (body, ball, stem). Seals: POM (ball), NBR (stem). Operating temperature: from -40°C to +100°C (POM); from -20°C to +100°C (NBR).