Factory-built 7-9 ton compact excavators come with limited reserved hydraulic ports, failing to support later installation of breakers, wood grapples and auger drills. Conventional refitting requires cutting original pipelines, which disrupts factory hydraulic flow and triggers unstable pressure output. The Hengli HVSE18 spare valve plate is an OEM expansion component and matched excavator valve spool for HVSE18 main multi-way valves. It adds independent auxiliary oil circuits with zero changes to original pipeline layout. This article introduces its verified technical specs, field performance and practical usage limits.
Rated working pressure: 31MPa, consistent with original main pump rated pressure; burst test pressure reaches 48MPa, meeting ISO 10768 hydraulic valve industrial standard
- Rated flow rate: 75L/min, matching the standard flow of 75/80/85 ton excavator main control valves; flow deviation controlled within ±2.3% under full load operation
- Mounting tolerance: Hole position center distance tolerance ±0.05mm, fully consistent with original valve body casting benchmark; no manual grinding required for assembly
- Internal structure: Integrated main inlet/return oil passage + independent pilot control port; internal channel roughness Ra≤0.8μm to reduce hydraulic flow loss
This valve spool fits compact excavators equipped with genuine Hengli HVSE18 main distribution valves: Sany 75C, XCMG 75DA/80D, Lingong 75F/80, Liugong 75E and Lovol 75/80/85. It is not compatible with third-party modified or replacement main valves. It retains factory original hydraulic control logic and will not affect the normal priority movement of excavator booms and arms.
Fabricated with stress-relieved forged cast steel instead of ordinary sand casting, this durableexcavator valve spool withstands 200,000 cycles of 28MPa cyclic pressure impact without cracking or deformation. Under high-temperature working conditions (38℃ ambient temperature, 75℃ hydraulic oil temperature), its internal leakage rate is 67% lower than ordinary aftermarket cast valve plates. Precision-machined sealing grooves match original oil seals perfectly to prevent slow oil seepage in long-term operation.
This spare valve plate serves two core scenarios: hydraulic circuit expansion for new attachment retrofitting, and direct replacement of worn, leaky or stuck original valve spools. It ensures independent control of auxiliary hydraulic tools without altering the excavator's original hydraulic response. One clear limitation applies: it only supports single attachment operation; simultaneous running of two hydraulic tools will cause minor flow attenuation, a typical constraint of single-channel expansion valve bodies.
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