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]
This heavy-duty accumulator diaphragm (piston cup) is specially engineered for RAMMER S21-HIGH hydraulic rock breakers, the core energy storage sealing component of breaker nitrogen accumulator. It fully isolates high-pressure nitrogen chamber and hydraulic oil circuit, delivering stable energy storage & impact output for medium-small excavator mounted breakers.
Adopted imported high-performance PPDI polyurethane composite material, the diaphragm features outstanding high temperature resistance, ultra-high elasticity, tear resistance and fatigue resistance. It perfectly matches OEM original diaphragm size, solves common faults like nitrogen leakage, insufficient impact force and short service life, greatly lowering maintenance frequency under long-term high-frequency impact heavy-duty operation.
Item |
Detailed Parameter |
Product Name |
RAMMER S21-HIGH Hydraulic Breaker Diaphragm Piston Cup |
Applicable Model |
RAMMER S21-HIGH Rock Breaker |
Dimension Size |
Φ72 × 15mm |
Main Material |
Imported high-strength PPDI modified polyurethane |
Max Working Pressure |
62MPa |
Working Temperature |
-30°C ~ 150°C |
Core Function |
Isolate nitrogen & hydraulic oil, energy storage buffer |
Cross Reference OEM No. |
RAM-S21H, 300909 |
Net Weight |
Approximately 0.12kg |
Applicable System |
Hydraulic breaker accumulator nitrogen energy storage system |
Warranty |
12 Months |
Fully compatible with original RAMMER S21-HIGH breaker accumulator, consistent with OEM part numbers RAM-S21H and 300909. Standard forming size without trimming, direct installation without modification.
Core diaphragm adopts imported PPDI polyurethane raw material via integrated vulcanization molding. Ultra-high resilience, anti-aging, oil corrosion resistant, stable performance under -30°C low temperature to 150°C high temperature continuous working environment.
Special layered reinforced edge design, withstand thousands of high-frequency stretch cycles per minute without plastic deformation or crack. Effectively prevent diaphragm rupture caused by pressure fluctuation, extend service life 2-3 times vs ordinary rubber diaphragms.
Tight fit with accumulator inner cavity, completely block nitrogen leakage and hydraulic oil mixing. Maintain stable accumulator pressure, guarantee consistent breaker impact energy, avoid construction efficiency drop caused by pressure loss.
Each diaphragm passes high-pressure air tightness, cyclic fatigue aging and high-low temperature cycle tests before delivery, meets OEM quality standards, stable and reliable for long-term mining & construction heavy load working.
Suitable for RAMMER S21-HIGH hydraulic rock breakers matched on multiple engineering equipment: • 5–8 ton mini excavators (Sany SY60, XCMG XE75, LiuGong 75E, Sunward 70) • Small wheel loaders with breaker attachment • Municipal demolition & road maintenance machinery • Quarry rock crushing & secondary breaking equipment • Foundation excavation, tunnel and trench construction equipment • Heavy-duty mobile hydraulic breaking 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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