R901422426 Bosch Rexroth Pressure relief valve

Valves of type DBDH…XC…E are type-examination tested, direct operated pressure relief valve according to Pressure Equipment Directive 2014/68/EU. They are used for limiting a system pressure and are intended for use as safety valves. If the pre-set response pressure at the channel P is exceeded, the valves respond and internally connect channel P and channel T. Depending on their variant, the valves are designed as screw-in cartridge valve (“K”) for screw-in in block designs, as valve with threaded connection (“G”) or as valve for subplate mounting (“P”). The actual screw-in cartridge valve used in all variants basically consists of sleeve (7), spring (6), poppet (5.1, response pressures up to 400 bar) or ball (5.2, response pressures from 405 bar), valve seat (4) and the adjustment element (8). The spring presses the poppet (5.1) and/or the ball (5.2) onto the valve seat (4). At the factory, the response pressure is set to a fixed value using the adjustment element; afterwards, the valve is sealed. The channel P is connected to the system. The pressure existing in the system acts on the poppet and/or the ball. If the pressure in the channel P increases above the value specified by the preload of the spring, the poppet and/or the ball is lifted off the valve seat against the spring force and connects channel P and T. The hydraulic fluid flows from the channel P into the channel T. The maximum possible stroke of the poppet is limited by structural measures. The valves are available with graded response pressures (in 5 bar steps). The valve spring can be unloaded by means of the hand wheel and a response pressure lower than that of the factory setting can be set without the need of removing the lead seal. See operating instructions. Screw-in cartridge valve Type DBDH 10 K1X/...XC...E, response pressures 30 ... 400 bar Related symbol Response pressures 405 ... 630 bar (ball seat valve NG10) Sample figure

1,2	Support ring, O-ring at the valve body
3	Axial sealing with individual seal