33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
Product Overview
This heavy‑duty accumulator cup diaphragm is specially engineered for Sandvik HL300 and HL438 hydraulic rock drills. It serves as the core isolation component separating high‑pressure nitrogen and hydraulic oil inside the accumulator. Manufactured from imported high‑performance HNBR and reinforced fabric composite rubber material, the part delivers outstanding anti‑fatigue, oil‑resistant, wear‑resistant and anti‑aging performance. It perfectly replaces original Sandvik diaphragm spare parts, solves typical failures such as nitrogen leakage, weakened percussion power, unstable impact frequency and hydraulic oil cross‑contamination, and extends rock drill service life under continuous high‑frequency heavy‑duty mining and tunneling operations。
Product Specifications
Item |
Detailed Parameter |
Product Name |
Sandvik HL300 / HL438 Rock Drill Accumulator Cup Diaphragm |
Applicable Model |
HL300, HL438 Hydraulic Rock Drill |
Compatible Series |
Sandvik HL‑series Top‑hammer Percussion Rock Drill |
Main Material |
Imported HNBR Hydrogenated Nitrile Rubber + Reinforced Fabric Insert |
Max Working Pressure |
18 MPa |
Working Temperature |
-25°C ~ 130°C |
Kit Contents |
1×Cup‑shaped accumulator diaphragm (single unit) |
Cross Reference OEM No. |
55001248, 55002761 |
Net Weight |
Approximately 0.42 kg |
Applicable System |
Rock drill accumulator energy‑storage hydraulic system |
Warranty |
12 Months |
Key Selling Points
1. 100% Exact OEM Replacement
Fully dimensionally compatible with original Sandvik HL300 and HL438 hydraulic rock drills. Matches OEM reference numbers 55001248 and 55002761. No trimming or modification needed for direct field installation.
2. Premium Reinforced Elastomer Material
Core diaphragm body adopts high‑strength HNBR hydrogenated nitrile rubber embedded with fabric reinforcement layer. Excellent oil resistance, gas‑tightness and high‑frequency flex‑fatigue resistance, maintains stable elasticity within‑25°C ~ 130°C working range, resists cracking under millions of percussion cycles。
3. Zero Gas‑Oil Cross‑Leakage & Stable Percussion Performance
Each diaphragm undergoes strict high‑pressure air‑tightness and fatigue cycle testing under 18 MPa rated working pressure. Effectively blocks nitrogen‑hydraulic‑oil inter‑leakage, keeps accumulator pre‑charge pressure steady, restores rated impact force and consistent blow frequency of rock drill.
4. High‑Fatigue Cup‑Shaped Structural Design
Optimized variable‑thickness cup geometry; thickened sealing bead ensures reliable compression sealing in accumulator housing; flexible central deformation zone avoids local stress folding and premature rupture under high‑speed cyclic deformation。Reduces unexpected downtime caused by diaphragm burst.
5. Strict Factory Quality Control
Every cup‑diaphragm passes air tightness, pressure impulse and accelerated aging tests before shipment. Meets OEM performance standards for harsh underground mining and tunneling conditions, ensuring dependable long‑term service.
6. Application Scope
Designed for Sandvik HL300 / HL438 hydraulic rock drills deployed on multiple heavy‑duty drilling rig equipment:
• Underground hard‑rock mine bolting drill rigs
• Medium‑long hole production drilling jumbo
• Light‑duty tunnel boring & tunneling drill carriers
• Surface quarry drilling equipment
• Hydraulic rock‑drilling engineering machinery
• High‑frequency percussion accumulator systems for mining mobile machinery
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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