RESEARCH PAPER
Dual-Stage Relief Valve for Sub-Critical Pressure Transients and LCF Suppression in Electro-Hydraulic Hammers
1
College of Mechanical and Electrical Engineering, Jilin University of Chemical Technology,, China
2
College of Mechanical and Electrical Engineering, Jilin University of Chemical Technology,, Chile
3
Jilin university of Chemical Technology, China
Submission date: 2025-12-30
Final revision date: 2026-02-20
Acceptance date: 2026-03-11
Online publication date: 2026-03-23
Corresponding author
Cheng Hu Guo
College of Mechanical and Electrical Engineering, Jilin University of Chemical Technology,, China
College of Mechanical and Electrical Engineering, Jilin University of Chemical Technology,, China
KEYWORDS
Dual-stage relief valveDifferential areaLow-cycle fatiguePressure fluctuationElectro-hydraulic hammer
TOPICS
ABSTRACT
To address low-cycle fatigue in electro-hydraulic hammers induced by sub-critical pressure fluctuations (35–40 MPa), which conventional valves fail to mitigate due to a response “dead zone”, this study proposes a dual-stage relief valve with a fixed geometric differential area. This design decouples high- and low-pressure regulation, integrating a direct-acting stage for surges (>40 MPa) with a pilot stage for sub-critical transients to eliminate the blind spot. Structural parameters were optimized via sensitivity analysis. Validated by AMESim/Simulink co-simulation and experiments, the valve achieves a 20 ms response time—40% faster than conventional valves—and reduces fluctuation amplitudes from 5 MPa to 1.5 MPa. Stress analysis indicates cyclic stress reduction from 108.1 MPa to 43.2 MPa. Consequently, predicted service life extends from 9.6×10⁴ to 9.8×10⁶ cycles, increasing by nearly two orders of magnitude. This design shifts from reactive protection to proactive stability management, enhancing heavy-duty hydraulic system reliability.
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| eISSN: | 2956-3860 |
| ISSN: | 1507-2711 |
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