Bosch Rexroth | LFA63DB2-7X315
LFA63DB2-7X/315
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The LFA63DB2-7X/315 control cover belongs to the LFA 2 Way Control Covers series and is manufactured by Bosch Rexroth for hydraulic automation tasks that require dependable pressure control. It functions as a pressure-limiting device because the DB function type vents excess energy to keep downstream circuits within a fixed range. The pilot-operated seat valve design delivers tight shut-off while minimizing leakage. Connection is made by subplate mounting so the unit can be exchanged without pipework changes, and the installation bore follows ISO 7368 dimensions to match standardized cavity blocks. A nominal size of 63 establishes the orifice diameter that balances high flow with acceptable pressure drop. The set pressure is factory adjusted to 315 bar and can be altered on site through a hexagon adjustment screw, giving maintenance staff a straightforward means to fine-tune system limits. Compatibility with HL, HLP, and HFC hydraulic fluids broadens the choice of medium in fire-resistant or mineral-oil systems.
System ratings are supported by a maximum operating pressure of 420 bar, while a maximum response pressure of 400 bar defines the threshold at which the pilot stage opens to relieve the main line. The cover passes up to 5000 l/min from port A to port B, allowing large-volume actuators to move without restriction, and the pilot stage itself is limited to 23 l/min so that control flow remains stable. Port B is rated at only 15 bar because it discharges to tank, preventing back-pressure from interfering with valve performance. To avoid silting and wear, the hydraulic medium must meet ISO 4406 cleanliness class 20/18/15. NBR sealing elements contain the chosen fluid and withstand temperature swings common in press environments. The assembly weighs 19.120 kg, a factor to consider when selecting mounting hardware and handling equipment during service.
Technical Specifications
Adjustment Type
Hexagon
Fluid Cleanliness
ISO 4406 (20/18/15)
Function Type
Pressure Limiting (DB)
Hydraulic Fluid
HL, HLP, HFC
Installation Bore
ISO 7368
Maximum Flow (a To B)
5000 l/min
Maximum Operating Pressure
420 bar
Maximum Pilot Flow
23 l/min
Maximum Response Pressure
400 bar
Nominal Size
63
Port B Max Pressure
15 bar
Seal Material
NBR
Set Pressure
315 bar
Type Of Connection
Subplate Mounting
Valve Design
Pilot-Operated Seat Valve
Weight
19.120 kg
1620 Old Apex Road
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