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Q1: The pump operates normally on land but experiences cavitation when installed on a ship (rolling and pitching motion)—how to fix it?
A10: Shipboard cavitation is caused by oil level fluctuations due to rolling/pitching—solutions: ① Tank Modifications: Install anti-surge baffles in the hydraulic tank (vertical baffles every 30cm) to reduce oil sloshing; increase the tank volume by 50% (e.g., from 200L to 300L) to maintain a stable oil level during ±15° rolling; ② Suction Line Optimization: Route the suction line to the tank’s center (not side) and install a sump (10L capacity) at the suction port—ensures oil supply during extreme pitching; use a flexible suction hose (Rexroth R13) to absorb ship vibration; ③ Pressure Compensation: Install a vacuum relief valve in the tank (opens at -0.1 bar) to prevent negative pressure during rolling (which causes air ingestion); ④ Oil Level Monitoring: Use a float switch with a wider activation range (e.g., trigger alarm when oil level drops by 20% instead of 10%) to account for fluctuations; ⑤ Operation Adjustment: Reduce pump speed by 10% (via VFD) during rough seas to lower suction demand—this reduces cavitation risk by 60%. These modifications ensure stable operation during sea states up to Beaufort Scale 6 (rough seas).
Q2: After a system overhaul, the pump’s LR2 control conflicts with the new directional valve—how to resolve the control logic mismatch?
A11: Control conflicts arise from mismatched pressure/flow signals between the LR2 pump and new valve—resolution steps: ① Identify Conflict Type: 1) “Pressure Conflict”: Valve requires 300 bar, but pump limits to 250 bar (LR2 power setting too low); 2) “Flow Conflict”: Valve demands 80 L/min, but pump only supplies 50 L/min (swashplate angle restricted); ② Parameter Calibration: 1) For Pressure Conflict: Increase the LR2 power limit by adjusting the power feedback sensor (e.g., from 37 kW to 41 kW) to allow higher pressure; 2) For Flow Conflict: Adjust the LR2 control valve’s maximum displacement screw (clockwise 1/2 turn) to increase flow output; ③ Signal Synchronization: Connect the directional valve’s load signal (LS port) to the pump’s control port Y—this creates a closed loop where the pump adjusts flow/pressure based on the valve’s demand; ④ Testing & Tuning: Operate the valve through all positions while monitoring pump pressure/flow—use a oscilloscope to verify that pump signals (4-20mA) align with valve signals; adjust the LR2 valve’s damping to eliminate signal lag (≤0.1s); ⑤ Documentation: Record the calibrated parameters (power limit, flow range) and store them in the system manual—critical for future maintenance. This process resolves 95% of control conflicts between LR2 pumps and new hydraulic components.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2015
Total Annual:
2000000-5000000
Employee Number:
30~50
Ecer Certification：
Verified Supplier
Xiamen Lang Ye Hydraulic Electromechanical Equipment Co., Ltd.Lang Ye Hydraulic is the excellent supplier of hydraulic gear pump, HPU, hydraulic control valve, orbital motor and so on. We offer integrated R& D, production and sales service. We have our own self built R&D laboratory and a num... Xiamen Lang Ye Hydraulic Electromechanical Equipment Co., Ltd.Lang Ye Hydraulic is the excellent supplier of hydraulic gear pump, HPU, hydraulic control valve, orbital motor and so on. We offer integrated R& D, production and sales service. We have our own self built R&D laboratory and a num...
