Description Size 25 … 63 Component series 7X Size 25 … 63 Component series 7X Product description General 2-way cartridge valves for pressure functions are pilot-operated valves in seat or spool design. The power section designed as cartridge valve (1) is installed into a receiving hole standardized according to DIN ISO 7368 and closed with a control cover (2). The pilot control valve (4) for manual or electrically proportional pressure adjustment is integrated into the control cover (2) or is installed on the control cover (2) as pilot valve with mounting dimensions according to DIN 24 340. By combination of cartridge valves with the control covers, different pressure functions can be realized. . Pressure reducing function Rest position closed For the pressure reducing function with opening characteristic, a pressure limitation cartridge valve (type LC..DB40D...) and a control cover with a pressure reducing pilot control valve (type LFA..DR...) are applied. The pilot oil is directed from port A via the supply orifice and the opened pilot control valve to side B. The main spool is opened and the flow from port A to port B is released. On reaching the set pressure, the spool is closed and the pressure at port B is reduced according to the pressure-flow characteristics. Potential pressure increases on the secondary side are discharged to the tank via the 3rd way of the pilot control valve. Set-up of a directional valve enables realization of an additional blocking function (type LFA..DRW...). Type code Control cover for pressure reducing function 01 02 03 04 05 06 LFA DREZ ‒ 7X / 014 Type 01 Control cover LFA LFA Size 02 NG 25 25 NG 32 63 NG 40 40 NG 50 50 NG 63 63 Version 03 Pressure reducing function - Main spool in rest position closed (LC..DB 40 D..- separate order) DREZ Component series 04 Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 7X Pressure rating (pressure reducing valve) 05 Set pressure up to 16 bar 014 Seal material 06 NBR seals no code FKM seals V Additional preferred types and standard units are specified in the EPS (standard price list). Main spool in rest position closed - LC..DB 40 D..- separate order Orifice symbol Symbol in ordering code A** A** This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation. Example: A12 = Orifice with Ø1.2 mm in channel A. Ø1,2 This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm) Z12 This orifice is designed as screw-type orifice. This is a standard orifice. No specifications are made in the type designation. (Orifice Ø in 1/10 mm) Technical data general Size 25 32 40 50 63 hydraulic Size 25 32 40 50 63 Hydraulic fluid see table Hydraulic fluid temperature range NBR seals °C -30 … +80 FKM seals °C -20 … +80 Viscosity range mm²/s 2.8 … 380 Maximum admissible degree of contamination of t
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