Description Size 4 Component series 1X Maximum operating pressure 420 bar Maximum flow 20 l/min Features Screw-in cartridge valve For applications with especially high tightness requirements Leakage-free up to a maximum of 80 % of the set cracking pressure 2 adjustment types, optionally: • Grub screw with internal hexagon • Hand wheel Product description The pressure valve type DBD...SO156 is a direct operated pressure relief valve for the installation in block designs. It is used for applications with especially high sealing requirements for limiting a system pressure. The system pressure can be set via the adjustment type (4). The valve is closed in initial position. Via control line (2) and poppet (1), the pressure in the main port ① acts on the spring plate (5). If the pressure in the main port ① rises above the value set at the compression spring (3), the poppet (1) opens and the hydraulic fluid flows into the main port ② Type code 01 02 03 04 05 06 07 08 09 10 11 DBD 4 K 1X / V S0156 * 01 Pressure relief valve, direct controlled DBD Adjustment type 02 Grub screw with internal hexagon S Hand wheel H 03 Size 4 4 04 Cartridge valve K 05 Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) 1X Pressure rating 06 Set pressure up to 50 bar 50 Set pressure up to 100 bar 100 Set pressure up to 200 bar 200 Set pressure up to 315 bar 315 Set pressure up to 420 bar 420 Seal material 07 set to cracking pressure – set and sealed to cracking pressure P Cracking pressure 08 Cracking pressure 90 +5 bar e.g. 090 Seal material 09 FKM seals V Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) 10 SO156 11 Further details in the plain text * Technical data hydraulic Size 4 Maximum operating pressure bar 420 Maximum flow l/min 20 Hydraulic fluid see table Hydraulic fluid temperature range °C -20 … +80 Viscosity range mm²/s 20 … 200 Maximum admissible degree of contamination of the hydraulic fluid 1) Class 20/18/15 according to ISO 4406 (c) 1) 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 www.boschrexroth.com/filter. general Size 4 Weight (approx.) kg 0.05 Installation position any Ambient temperature range °C -20 … +80 (For applications outside these values, please consult us!) Hydraulic fluid Classification Suitable sealing materials Standards Mineral oil HL, HLP FKM, NBR DIN 51524 Bio-degradable Insoluble in water HEES (synthetic esters) FKM VDMA 24568 HETG (rape seed oil) FKM, NBR Soluble in water HEPG (polyglycols) FKM VDMA 24568 Other hydraulic fluids on request Diagrams/characteristic curves (measured with HLP46, ϑOil = 40 ±5 °C) pE-qV characteristic curves Δp-q V characteristic curves The characteristic curves apply for output pressure = 0 in the entire flow range! Definition cracking pressure: Pressure i
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