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Hydraulic & Pneumatic Tools

Bosch Rexroth Bladder-Type Accumulators

Bladder-type accumulators are used for energy storage, shock and vibration absorption and leakage oil or volume compensation in hydraulic systems. They consist of a seamless pressure vessel (high-tensile steel) whose interior is split into a gas and fluid side by an elastic bladder. When the operating pressure is increased, hydraulic fluid flows into the accumulator and compresses the gas in the bladder until the gas pressure is identical to the fluid pressure. When the operating pressure is reduced, the gas expands again and, in this way, feeds the hydraulic system with hydraulic fluid.

Nominal volume 1 50 liters
Component series 4X
Maximum operating pressure 350 bar
Hydraulic accumulator as per Pressure Equipment Directive 9723EC
Bladder material for different applications
Use e.g. as energy storage in intermittent operation systems, energy reserve for emergencies, compensation of leakage losses, shock and vibration absorption
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Bosch Rexroth Diaphragm Type Accumulators HAD

Diaphragm type accumulators are used for energy storage, shock and vibration absorption and leakage oil or volume compensation in hydraulic systems. They consist of a pressure-resistant tank (high-tensile steel) whose interior is split into a gas and a fluid side by an elastic diaphragm. When the operating pressure is increased, hydraulic fluid flows into the accumulator and compresses the gas until the gas pressure is identical to the fluid pressure. When the operating pressure is reduced, the gas expands again and, in this way, feeds the hydraulic system with hydraulic fluid.

Nominal volume 0.075 to 3.5 liters
Component series 1X and 2X
Maximum operating pressure 350 bar
Hydraulic accumulator as per Pressure Equipment Directive 9723EC
Diaphragm material for different applications
Use e.g. as energy storage in intermittent operation systems, energy reserve for emergencies, compensation of leakage losses, shock and vibration absorption
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Hydac SBO Diaphragm Accumulators

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
Diaphragm Accumulators have been successfully applied in both industrial and mobile applications for energy storage, maintaining pressure, leakage compensation, and vehicle hydraulic systems.
HYDAC manufactures two types of diaphragm accumulators:

Non-repairable (welded)
Repairable (threaded)
Diaphragm Materials

Not all fluids are compatible with every elastomer at all temperatures, therefore, HYDAC offers the following materials:

NBR (Standard Nitrile)
LT-NBR (Low Temperature Nitrile)
ECO 30 (Epichlorohydrin)
IIR (Butyl)
FPM (Fluorelastomer)
others (available upon request)
To determine which material is appropriate, always refer to fluid manufacturers recommendation.

Corrosion Protection

For use with certain aggressive or corrosive fluids, or in a corrosive enviroment, HYDAC 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 enviroment.

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

HYDAC diaphragm accumulators are designed to be screwed directly onto the system. We also recommend the use of our mounting components, (detailed on page 84) to minimize the risk of failure due to system vibrations



Some common applications of diaphragm accumulators are:

Agricultural Machinery & Equipment
Forestry Equipment
Machine Tools
Mining Machinery & Equipment
Mobile & Construction Equipment
Off-Road Equipment
For specific examples of applications using diaphragm accumulators, please see page 89.
Construction

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.
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Hydac SK Series Piston Accumulators

Piston Accumulators are a cost effective option for numerous functions involving energy storage, and sometimes shock absorption in a hydraulic or fluid system. They are well suited for applications needing:

High Pressure Ratios
Large Volumes of Oil
High Fluid flow rates
Volumes monitoring by way of piston position sensor or switch systems
Advantages of Using the Low-friction Sealing System (type 2):

Minimum friction
Suitable for low pressure differentials
No start-up friction, no stick-slip
Low noise, no vibration
High piston speeds up to 12 ftsec continuous
Improved accumulator efficiency
High life expectancy, low maintance requirements
Construction

HYDAC piston accumulators consist of:

A cylinder with a finely finished internal surface
An end cap on the gas side and fluid side, sealed with 0-rings
A lightweight metal piston
A variety of sealing systems are available depending on the application
Sealing Systems

Precise information about the proposed operating conditions is required in order to select the most appropriate sealing system. Important criteria for this selection are:

Number of actuations or cycles
Piston speed
Temperature fluctuation
Operating fluid
Cleaniness of fluid
Maintenance requirements
Seal Materials

The following sealing elastomers are available, depending on the operating conditions:

NBR (acrylic nitrile butadiene rubber)
FPM (fluoro-elastomer)
PUR (polyurethane)
Suitable materials are also available for low temperature applications.

Fluids

The following sealing materials are suitable for the fluids listed below:

NBR, resistant to:

Mineral Oils (HL and HLP)
Non-flammable fluids from groups HFA, HFB, and HFC
Water and seawater up to approx. 100C
NBR, not resistant to

Aromatic hydrocarbons
Chlorinated hydrocarbons
Amines and ketones
Hydraulic fluids from the HFD Groups
FPM, resistant to:

Mineral Oils (HL and HLP)
Hydraulic fluids from the HFD Groups
Fuels as well as aromatic and chlorinated hydrocarbons
Inorganic acids (but not all, please contact HYDAC)
System Mounting

HYDAC piston accumulators may operate in any position. Vertical installation is preferable with the gas side up. We recommend the use of our mounting components, which are detailed on page 84, to minimize risk of failure due to system vibrations.

Effects of Seal Friction

The permissible piston velocity depends on the sealing friction. Higher piston velocities are possible where there is less sealing friction.

HYDAC piston accumulators with low friction piston seals allow continuous operating velocities of up to 12 ftsec with short bursts, up to 15 ftsec (see type 2 piston).

Small pressure differentials between gas and oil side improve the effectiveness of HYDAC piston accumulators. To emphasize the friction effect on the pressure curve during an accumulation cycle, measurements with various sealing systems are illustrated.

The measurements graphs below are a true representation of the gas and oil pressure of piston accumulators with different sealing systems. The comparison of these two measurements clearly shows the difference int he pressure differential between gas and oil side:

Graph 1: p max. 125 psi

Graph 2: p max. 14.5 psi

The effect of the sealing friction on the working pressure is particularly striking in traditional piston designs. Abrupt piston movements (the stick-slip effect) are caused by the seal friction as shown in Graph 1. the low sealing friction of HYDAC type 2 pistons drastically reduces the stick-slip effect therefore maximizing piston responsiveness.
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