Description Size 16 … 32 Component series 2X Maximum operating pressure 350 bar Maximum flow 400 l/min Features Zero-pressure start-up and circulation of the pump Intended for direct mounting onto the SAE pressure port of the pump Low circulation pressure due to short distance Low compression volume for soft switching to depressurized circulation Quick pressure build-up Low noise level due to direct flange mounting at the pump CE conformity according to the Low-Voltage Directive 2014/35/EU for electrical voltages >50 VAC or >75VDC Solenoid coil as approved component with UR marking according to UL 906, edition 1982, optional Product description General Pump safety blocks type DBA are pilot-operated pressure relief valves which are integrated into a block and intended to be mounted directly onto SAE pressure ports of pumps. It is used for limiting (type DBA) the operating pressure. Pump safety blocks generally consist of valve block (1) and pressure limitation screw-in cartridge valve type DB 20 K (2) (data sheet 25818). Optionally, a pressure switch type HED 8 (3) (data sheet 50061) can be installed on the valve block. The valve housing is equipped with a port P for hydraulic fluid input and port P1 for hydraulic fluid output. In a branch of the through connection between these two ports, the pressure limitation screw-in cartridge valve can be found. By opening this valve, a connection to port T (tank line) is established. At the standard model, connection diagram NG6 is covered with the cover plate (4). The pressure in the through connection (P - P1) has an effect on the main control spool (5) of the pressure limitation screw-in cartridge valve. Via the nozzle bores (6 and 7), the pressure is at the same time applied to the poppet (8). If the pressure in port P exceeds the value set at spring (9), the poppet (8) opens against the spring (9). Via the nozzle bores (6 and 7), the hydraulic fluid from channel P flows into the spring chamber (10) and is here internally directed via the control line (11) into the tank. Due to the state of equilibrium at the main control spool (5), 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. Pump safety block type DBA…D (with pressure switch) The use of an electrical pressure switch type HED 8 (3) (data sheet 50061) enables activation and deactivation of an electric circuit via the control line (13). In basic design, the control line (13) is closed with a plug screw (14). Notice: The pressure gauge connection M and tank port T are illustrated with an offset of 90°. Type code 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 DBA 2X / K4 01 Pump safety block DBA 02 Without directional valve no code 03 Size 16 15 ◇ Size 25 25 ◇ Size 32 30 ◇ 04 Without directional valve no code Type of connection / SAE flange 1) 05 Standard flange (250 … 350 bar) F ◇ High-pressure flange (350 bar) H ◇ Adj
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