Check valve, pilot operated Type Z2S

  • Size 6
  • Component series 6X
  • Maximum operating pressure 315 bar
  • Maximum flow 60 l/min
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Installation positionany
Ambient temperature rangeNBR seals°C-30 … +80
FKM seals°C-20 … +80


Maximum operating pressurebar315
Cracking pressure 1)bar1.5 / 3 / 6
Maximum flowl/min60
Direction of flowsee symbols
Hydraulic fluidsee table
Hydraulic fluid temperature range (NBR seals)°C-30 … +80
Hydraulic fluid temperature range (FKM seals)°C-20 … +80
Viscosity rangemm²/s2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid 2)Class 20/18/15 according to ISO 4406 (c)
Area ratioWithout pre-openingA1/A2 ~ 1/3.5 (see sectional drawing)
With pre-openingA3/A2 ~ 1/12.5 (see sectional drawing)
Version “SO60”A1/A4 ~ 1/7 (see sectional drawing)
1)in free direction
2)The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see

Selection of optimal sealing material also depends on the type of hydraulic fluid used.

Hydraulic fluidClassificationSuitable sealing materialsStandards
Mineral oilsHL, HLP, HLPDNBR, FKMDIN 51524
Bio-degradableInsoluble in waterHETGNBR, FKMVDMA 24568
Soluble in waterHEPGFKMVDMA 24568
Flame-resistantWater-freeHFDU, HFDRFKMISO 12922
Containing waterHFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)NBRISO 12922

Important information on hydraulic fluids!

  • For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us!
  • There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)!
  • The flash point of the hydraulic fluid used must be 40 K higher than the maximum solenoid surface temperature.

Flame-resistant – containing water:

Maximum operating pressure 210 bar

Maximum hydraulic fluid temperature 60 °C

Life cycle compared to operation with mineral oil HL, HLP 30 to 100  %