Description Size 10 … 25 Component series 4X Maximum operating pressure 350 bar Maximum flow 400 l/min Features For subplate mounting Porting pattern according to ISO 6264-06-09-*-97 (NG10) and ISO 6264-08-13-*-97 (NG25) For threaded connection 4 adjustment types for pressure adjustment, optionally • Rotary knob • Sleeve with hexagon and protective cap • Lockable rotary knob with scale • Rotary knob with scale 5 pressure ratings CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC Product description Valves of type DB are pilot-operated pressure relief valves. They are used for limitation of the operating pressure. The valves basically consist of housing (1) and pilot control valve (2) with adjustment type. The pressure applied to channel P acts on the main spool (3). Via the nozzle bores (4 and 5), the pressure is at the same time applied to poppet (6). If the pressure in channel P exceeds the value set at spring (7), poppet (6) opens against spring (7). Via the nozzle bores (4 and 5), the hydraulic fluid from channel P now flows into the spring chamber (8). From here, it is led into the tank internally (version "–"), via the control line (9 and 10), or externally (version "Y") via the control line (9 and 11). Due to the state of equilibrium at the main spool (3), hydraulic fluid flows from channel P to channel T, maintaining the set operating pressure. A pressure gauge connection (12) allows for the control of the operating pressure. The pressure relief valve can be unloaded or switched to another pressure (second pressure rating) via port X (13). DB 20 –1-4X/…W65 Type code 01 02 03 04 05 06 07 08 09 10 11 DB – 4X / W65 * 01 Pressure relief valve DB Size 02 Size 10 Subplate mounting "–" 10 Threaded connection "G" (G1 1/2) 10 Size 25 Subplate mounting "–" 20 Threaded connection "G" (G3/4) 15 Threaded connection "G" (G1) 20 Type of connection 03 Subplate mounting – Threaded connection G Adjustment type 04 Rotary knob 1 Sleeve with hexagon and protective cap 2 Lockable rotary knob with scale 3 1) Rotary knob with scale 7 05 Component series 40 ... 49 (40 ... 49: unchanged installation and connection dimensions) 4X 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 350 bar 350 Pilot oil flow 07 Pilot oil supply internal, pilot oil return internal no code External pilot oil supply, internal pilot oil return X Internal pilot oil supply, external pilot oil return Y External pilot oil supply, external pilot oil return XY 08 Standard version no code Valve for minimum cracking pressure (not suitable for mutual relief!) U Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data") 09 NBR seals no code FKM seals V 10 Vertical installation position of the screw-in cartridge valve (cartridge) W65 11 Further details in the plain text * 1) H-Key with material no. R90
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