Diaphragm accumulators are a cost effective option for numerous functions involving energy storage, shock absorption or pulsation dampening in a hydraulic or fluid system. They are well suited for applications where smaller fluid volumes and flow rates are adequate and that require or involve:

  • Compact design
  • Low weight
  • Flexible mounting positions
  • Extremely quick shock response
  • Low cost
  • Low lubricity fluids, like water


TypeDiaphragm Accumulator
Model Code DescriptionSBO330-0.75E1/422S-345AK
Fluid Port ConnectionBSP Connection
Weight4 kg8.9 lb
Size (L)0.75
MaterialChemically Plated Carbon Steel
SeriesSBO 330
Manufacturing ProcessWelded
Connection SizeG 1/2 BSPP Female
Country of InstallationUSA/ASME
Diaphragm CompoundNBR (Buna N)
Compound Operating Temperature Range (Mineral Oils)5 to 180 ºF
Compound Operating Temperature Range (Water and Water-Glycols (5% Minimum Glycol))32 to 180 ºF
Shell Construction and Gas Port DesignWelded Construction, rechargeable, ZP Gas Valve Version 1 (M 28 x 1.5)
ShellChemically plated carbon steel (internal & external for water service)
Fluid PortChemically plated carbon steel (ONLY WETTED SURFACES for water service)
Thread (British Standard Pipe Parallel (BSPP) – Female)G1/2
Flow25 gpm95 L/min
Maximum Pressure Ratio (p2:p0)8:1
Volume Capacity0.198 gal0.750 L
MAWP4700 psi330 bar
Effective Gas Volume45 in³


Diameter4.96 in126 mm
Height6.58 in167 mm
Dimension Q25 gpm
Dimension A4.78 in122.0 mm
Hex Size1.61 in41 mm


Both types of diaphragm accumulators have the same basic construction. The difference is in the shell. The welded version has a shell that is electron-beam welded, and therefore cannot be repaired. The threaded type has a shell made up of two halves (top and bottom) which are held together by a threaded locking ring.

Corrosion Protection

For use with certain aggressive or corrosive fluids, or in a corrosive environment, ZP offers protective coatings and corrosive resistant materials (i.e. stainless steel) for the parts that interface with the fluid or are exposed to the hostile environment.

Mounting Position

Diaphragm accumulators are designed to mount in any position. In systems where contamination is a problem, we recommend a vertical mount with the fluid port oriented downward.

System Mounting

ZP diaphragm accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components, to minimize the risk of failure due to system vibrations.


Some common applications of diaphragm accumulators are:Agricultural Machinery & EquipmentForestry EquipmentMachine ToolsMining Machinery & EquipmentMobile & Construction EquipmentOff-Road Equipment

Diaphragm Materials

Not all fluids are compatible with every elastomer at all temperatures, therefore, ZP offers the following materials:NBR (Standard Nitrile)LT-NBR (Low Temperature Nitrile)ECO 30 (Epichlorohydrin)IIR (Butyl)FP

Additional Information

Diaphragm Accumulators have been successfully applied in both industrial and mobile applications for energy storage, maintaining pressure, leakage compensation, and vehicle hydraulic systems.

ZP manufactures two types of diaphragm accumulators:Non-repairable (welded)Repairable (threaded)

If you work with gas cylinder or information about our company. You can communicate with us on the website. Our official website is www.zpcylinder.com. Our cost-effective products are very popular.

Leave a Reply

Phone +86-18622042946

Skype 18622042946

WhatsApp +8618622042946

QQ 2039738293

Back to top Back to top

Leave a message