Boom Valve Spool Hengli‑Style for Sany 55 Excavator

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Product details

Boom Valve Spool Hengli‑Style for Sany 55 Excavator

Product Overview

Boom Valve Spool Hengli‑Style for Sany 55 Excavator is a precision hydraulic spool component inside the main control valve. It controls the oil flow direction and flow rate to realize lifting and lowering actions of the excavator boom. Matching Hengli valve assembly, this spare part works as a core moving element within the hydraulic system of the Machine. Fine machining ensures good coordination with valve housing. It is an ideal replacement for worn, scratched or stuck original spool during equipment overhaul.

Technical Specifications

- Compatible Machine: Sany 55 Excavator

- Matching Valve: Hengli main control valve

- Product Name: Boom valve spool

- Working medium: Hydraulic oil

- Surface treatment: High‑precision grinding

- Operating temperature: ‑20℃ ~ +80℃

- Function: Control boom raise and lower

Working Principle

Installed inside the multi‑way main control valve, the boom valve spool shifts axially under pilot hydraulic pressure. It opens and closes corresponding oil passages, adjusting oil volume delivered to the boom cylinder. By changing oil flow in the hydraulic system, the spool drives the boom cylinder to extend or retract, completing boom lifting and lowering movements of the Machine. Smooth spool movement guarantees flexible boom operation without lag or jitter.

Key Advantages

1. High‑precision grinding processing, smooth surface, small fit clearance

2. Low internal leakage, effectively maintain working pressure of hydraulic system

3. Hengli‑style dimension, direct fit for Sany 55 excavator main control valve, no extra modification

4. Good wear‑resistance, anti‑scratch performance, extend service life of valve assembly

5. Strict dimensional tolerance, easy disassembly and replacement during Machine maintenance

Application Scope

This boom valve spool applies to Sany 55 excavator equipped with Hengli multi‑way valve. Mainly used for construction‑site excavation, loading and earth‑moving work. It undertakes boom action control inside the complete hydraulic system of the Machine, widely used for equipment repair and refurbishment.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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4 year

Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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