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 piston cup and diaphragm set is specially manufactured for DNB70 & DNB90 hydraulic rock breakers, core accumulator sealing spare parts widely matched on medium excavator demolition machinery. It acts as isolation barrier between high-pressure nitrogen cavity and hydraulic oil circuit, fully solving failure issues like diaphragm rupture, nitrogen leakage, weak striking force and frequent pressure drop.
Produced with imported reinforced HNBR and modified polyurethane composite materials, the parts feature outstanding fatigue resistance, oil resistance, high & low temperature stability and anti-tearing performance. It can perfectly replace original DNB breaker OEM diaphragms, stabilize breaker striking power and greatly extend accumulator service life under long-time high-frequency impact working conditions.
Item |
Detailed Parameter |
Product Name |
DNB70 DNB90 Breaker Accumulator Piston Cup & Diaphragm |
Applicable Model |
DNB70, DNB90 Hydraulic Rock Breaker |
Compatible Series |
DNB Series Medium Hydraulic Hammer |
Main Material |
Imported Reinforced HNBR + Modified PU Composite |
Max Working Pressure |
130MPa |
Working Temperature |
-35°C ~ 120°C |
Kit Contents |
Integral piston cup, reinforced diaphragm, auxiliary sealing gaskets |
Cross Reference OEM No. |
DNB70-DIA, DNB90-DIA, DNB-ACC-070/090 |
Net Weight |
Approximately 0.42kg per set |
Applicable System |
Breaker nitrogen accumulator energy storage system |
Warranty |
12 Months |
Precisely copied original dimensional tolerance for DNB70 and DNB90 breakers, fully matched OEM part numbers DNB70-DIA, DNB90-DIA and DNB-ACC-070/090. Direct installation without cutting, grinding or other modification, fast onsite replacement.
Core diaphragm and piston cup adopt imported high-strength HNBR + PU double-layer vulcanization process. Excellent hydraulic oil corrosion resistance, anti-aging and high stretch fatigue resistance, stably maintain elasticity under -35°C ~ 120°C alternating temperature environment.
All finished products pass 130MPa cyclic high-frequency impact fatigue test. Effectively prevent nitrogen leakage and internal hydraulic cross-leakage, keep consistent striking energy of the breaker and avoid machine power attenuation during continuous crushing operation.
One set contains all accumulator sealing consumables required for DNB70/DNB90 overhaul. Integrated matching accessories reduce spare parts sorting time, cut equipment maintenance downtime and lower overall operating cost of construction machinery.
Each batch of diaphragms and piston cups goes through air tightness test, high pressure fatigue test and thermal aging test before delivery. All indexes meet original OEM production standards, guarantee stable long-term construction site performance.
Suitable for DNB70/DNB90 hydraulic rock breakers equipped on multiple heavy-duty construction equipment:
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.
EN
AR
CS
DA
NL
FI
FR
DE
EL
IT
JA
KO
NO
PL
PT
RO
RU
ES
SV
TL
IW
ID
LV
SR
SK
VI
HU
MT
TH
TR
FA
MS
GA
CY
IS
KA
UR
LA
TA
MY
