Description Size 52 Component series 3X Maximum operating pressure 315 bar Maximum flow 2000 l/min Features For flange connection For subplate mounting 3 adjustment elements for pressure adjustment, optional: • Sleeve with hexagon and protective cap • Rotary knob • Lockable rotary knob Solenoid-actuated unloading via a built-on directional spool valve Pilot oil return, internal or external Remote control port, optional Main spool insert optionally as seat or spool version CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC Product description Pressure valves of type DB and DBW are pilot-operated pressure relief valves. They are used for the limitation (DB) or limitation and solenoid-actuated unloading (DBW) of a system pressure. The pressure relief valves basically consist of the pilot control valve (1) with pressure adjustment element (2), main valve (3) with main spool insert (4) and directional valve (5), optional. Pressure relief valve type DB The pressure applied by the system acts on the main spool (4). At the same time, pressure is applied to the spring-loaded side of the main spool (4) and to the pilot control valve (1) via the control lines (6) which are equipped with nozzles. If the system pressure exceeds the value set at the spring (7), the poppet (10) of the pilot control valve opens. The hydraulic fluid on the spring-loaded side of main spool (4) now flows via the spring chamber of the pilot control valve (1) to the tank, either internally via port T, or externally, via port Y. Due to the nozzle combination in the control lines, a pressure drop results at the main spool, the connection from P to T is thus released. The hydraulic fluid flows from channel P to channel T maintaining the set operating pressure. The pressure relief valve can be unloaded by means of remote control or switched to another pressure value via port X (8). Pressure relief valves type DBW The function of this valve is basically the same as that of valve type DB. The unloading of the main spool (4) is, however, achieved by controlling the mounted directional valve (5). To reduce the tank pressure peaks when switching to depressurized circulation by operating the directional valve, the main spool in spool version (4.1) can be used. Type DBW 52 BP2.3X/…XYU6EG24N9K4 With version "DBW …Y…", the connection T–Y is closed. 4.1 Spool version 4.2 Seat version Principle: Type code 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 52 – 3X / U * 01 Pressure relief valve DB 02 Without directional valve no code ◇ With attached directional valve W ◇ 03 Size 52 52 04 Normally closed A 1) Normally open B 1) ◇ Type of connection 05 For subplate mounting P ◇ for flange connection F ◇ Adjustment type for pressure adjustment 06 Rotary knob 1 Sleeve with hexagon and protective cap 2 ◇ Lockable rotary knob 3 2) Main piston 07 Seat version – 08 Component series 30 … 39 (30 … 39: unchanged installation and connection dimensions) 3
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