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 (leather cup seal) is specially developed for JAB JB70 external valve type hydraulic rock breakers, the core sealing component of the breaker nitrogen accumulator. It can be used independently or matched with full set O-rings, shaft seals and gaskets for complete breaker overhaul maintenance.
Adopted imported modified NBR and FKM fluororubber composite material, it features outstanding oil resistance, high-frequency fatigue resistance, tear resistance and wide temperature adaptability. It perfectly replaces original JAB JB70 OEM diaphragm, solves common faults such as nitrogen leakage, hydraulic oil seepage, insufficient impact force and rapid pressure drop, and greatly extends the service life of JB70 breaker under long-term mining, demolition and heavy impact working conditions.
Item |
Detailed Parameter |
Product Name |
JAB JB70 Hydraulic Breaker Accumulator Diaphragm Cup Seal |
Applicable Model |
JB70 Mid-weight External Valve Hydraulic Breaker |
Compatible Series |
JAB JB Series Rock Breaker |
Main Material |
Imported Modified NBR + FKM Fluororubber Reinforced Composite |
Max Working Pressure |
28MPa |
Working Temperature |
-28°C ~ 125°C |
Kit Matching Options |
Single diaphragm / Full overhaul seal kit (diaphragm + O-rings + gaskets + backup rings) |
Cross Reference OEM No. |
JAB-JB70-DIA, 70ACC001 |
Net Weight |
Approximately 0.32kg |
Applicable System |
Breaker nitrogen accumulator closed energy storage system |
Warranty |
12 Months |
Fully dimensionally consistent with original JAB JB70 breaker diaphragm, matches OEM part numbers JAB-JB70-DIA and 70ACC001. No trimming or modification required for direct installation on accumulator back head.
Core diaphragm adopts high-strength FKM & modified NBR vulcanized composite, added anti-fatigue reinforcing layer. It resists hydraulic oil corrosion, high-frequency stretching and tearing, stably operates under -28°C ~ 125°C severe temperature environment.
Every finished diaphragm undergoes 28MPa nitrogen tightness fatigue test. It completely isolates nitrogen chamber and hydraulic oil circuit, eliminates air leakage and oil mixing problems, maintains stable nitrogen pressure and consistent breaker impact energy.
Support single diaphragm replacement and full set overhaul seal kit two options. Complete supporting sealing accessories shorten on-site maintenance time and reduce equipment downtime & operation cost.
All diaphragms pass air tightness, high pressure cycle fatigue and high temperature aging tests before delivery, fully reach OEM production standards, delivering stable long-term performance for heavy-duty construction scenarios.
Fit all engineering machines equipped with JAB JB70 hydraulic rock breakers: • 14–18 ton medium excavators • Backhoe loaders and skid steer loaders • Quarry stone crushing equipment • Concrete demolition machinery • Road construction & municipal engineering equipment • Heavy-duty mobile crushing 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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