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HydacUSA Corp. Hycon Div.

Diaphragm Accumulators

Diaphragm Accumulators

HYDAC diaphragm accumulators utilize the compressibility of a gas (nitrogen) in storing hydraulic energy. The gas is required because fluids are practically incompressible and thus, can not store energy by themselves. The diaphragm is utilized to separate the gas and fluid sides of the accumulator.
 
The diaphragm accumulator functions by drawing in fluid from the hydraulic circuit when the pressure increases and thus, compresses the gas. It returns this energy to the circuit as the pressure decreases by the expansion of the gas.
 
A poppet is incorporated into the diaphragm to prevent its extrusion through the fluid port.
HYDAC manufactures two types of diaphragm accumulators:
- welded (non-repairable).
- threaded (repairable).
These have been successfully applied to both industrial and mobile applications in energy storage, maintaining pressure, leakage compensation and vehicle hydraulic systems (e.g., brake and suspension).
 
CONSTRUCTION
Welded Type It consists of:
- an electronic beam welded shell with gas charging valve or alternately, complete sealed. Fluid ports are available in various thread configurations.
- a flexible diaphragm to separate the gas and fluid sides.
- a poppet.
 
Threaded Type
 
It consists of:
- a forged upper section with the gas valve.
- a forged lower section with the fluid port.
- a locking ring to fasten the upper and lower sections together.
- a replaceable, flexible diaphragm to separate the gas and fluid sides.
- a poppet.
 
BLADDER MATERIALS
Not all fluids are compatible with every elastomer at all temperatures. HYDAC offers the following choice of elastomers:
- NBR (Standard Nitrile)
- LT-NBR (Low Temperature Nitrile)
- ECO (Epichlorohydrin)
- IIR (Butyl)
- FPM (Fluorelastomer)
- others available upon request.
 
CORROSION PROTECTION
HYDAC offers internal and/or external protective coatings. If this is insufficient, stainless steel is also available.
 
MOUNTING POSITION
Diaphragm accumulators by design may be mounted in any position. In systems where contamination is a problem, HYDAC recommends a vertical mount with fluid port oriented downward.
 
SYSTEM MOUNTING
HYDAC diaphragm accumulators are designed to be screwed directly onto the system. HYDAC also recommend the use of HYDAC's mounting components, refer to Mounting Components brochure #A3.502, to minimize the risk of failure due to system vibrations.
 
 

SBO Series Welded and Threaded Diaphragm Accumulators

These accumulators come in four configurations. Configuration E1 (welded construction, rechargeable, Hydac gas valve version 1), and configuration E4 (welded construction, rechargeable, Hydac gas valve version 4) have a maximum allowable pressure ration of 8:1 or 4:1 and comes in six versions with fluid sizes ranging from 0.075 to 3.5 liters. Configuration E2 (welded construction, factory precharged and sealed, non-rechargeable) have a maximum allowable pressure ration of 8:1 or 4:1 and comes in four versions with fluid sizes ranging from 0.075 to 1 liter. Configuration A6 (threaded construction, rechargeable, Hydac gas valve version 1) has a maximum allowable pressure ration of 10:1 and comes in six versions with fluid sizes ranging from 0.1 to 2 liters. Final pressure vessel codes vary depending on the country of installation. In the US and Canada pressure vessels are governed by the ASME pressure vessel code. HYDAC manufactures according to these standards. For installations in countries outside of the US, please consult Flo-Products Sales for appropriate certifications.
 

 
Elastomer Compatibility Table
In order to maximize system performance it is important to match your system fluid and its temperature range with the appropriate elastomer compound. The table below illustrates the most common ones. For special requirements, please consult Flo-Products sales.
Compound Operating Temperature Range Some Typical Fluids
NBR (BUNA N) +  5° F to + 180° F mineral oils
+ 32° F to + 180° F water and water-glycols
LT-NBR (LOW TEMP. BUNA) - 40° F to + 180° F mineral oils
ECO (HYDRIN) - 20° F to + 250° F mineral oils
IIR (BUTYL) - 20° F to + 200° F phosphate esters
brake fluids
FPM (VITON) +  5° F to + 300° F chlorinated hydrocarbons
Notes:
  1. The operating temperature range does vary with fluid types, please consult Flo-Products for more specific fluid data.
  2. The above typical fluids are some examples of the most common fluids, please consult Flo-Products for more specific data.
  3. For other applications not listed, please consult Flo-Products.

 
SBO 220 - 1 E2 / 1 1 2 S - 210 CK 026 Diaphragm accumulator; 1 liter capacity; welded construction; factory precharged and sealed; non rechargeable; carbon steel fluid port; carbon steel shell; NBR diaphragm; USA installation; maximum working pressure 210 bar at 8:1 ratio; standard SAE connection; 26 bar gas precharge pressure.
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xxx		 Gas precharge pressure in bar (Required for E2 version only)
3 digit number representing precharge pressure
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A
B
C
D
K
CK		 Connection Thread
BSP (ISO 228)
Metric (DIN 13)
SAE (ANSI B1.1)
NPT (ANSI B1.2)
Hexagonal (for internal threads only)
Standard SAE connection
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100
140
160
180
210
250
330
350
400
500
600
750		 Maximum Working Pressure in bar
100 bar - 1500 psi
140 bar - 2000 psi
160 bar - 2400 psi
180 bar - 2600 psi
210 bar - 3000 psi
250 bar - 3600 psi
330 bar - 4700 psi
350 bar - 5000 psi
400 bar - 5800 psi
500 bar - 7200 psi
600 bar - 8700 psi
750 bar - 10000 psi
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S
S1
E		 Country of Installation
USA/Canada
Canada
Mexico
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2
3
4
5
6
7		 Bladder Compound
NBR (Buna N)
ECO (Hydrin)
TIIR (Butyl)
LT-NBR (low temperature Buna)
FPM (Viton)
Others
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0
1
2
4
6		 Shell Material
Synthetic coated carbon steel (internal/water service)
Carbon steel
Chemically plated carbon steel (water service)
Stainless steel (316)
Low temperature carbon steel (< -20° F)
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1
3
4
6		 Fluid Port Material
Carbon steel
Stainless steel (316)
Chemically plated carbon steel (water service)
Low temperature carbon steel (< -20° F)
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E1
E2
E4
A6		 Configuration/Gas Port
Welded construction, rechargeable, HYDAC gas valve version 1 (M 28 x 1.5)
Welded construction, factory precharged and sealed, non rechargeable
Welded construction, rechargeable, HYDAC gas valve version 4 (8V1 ISO 4570)
Threaded construction, rechargeable, HYDAC gas valve version 1 (M 28 x 1.5)
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.075
.16
.32
.5
.6
.75
1
1.4
2
2.8
3.5
+
.1
.25
.6
1.3
2		 Size - Welded Diaphragm
.075 liters
.16 liters
.32 liters
.5 liters
.6 liters
.75 liters
1 liters
1.4 liters
2 liters
2.8 liters
3.5 liters
Size - Threaded Diaphragm
.1 liters
.25 liters
.6 liters
1.3 liters
2 liters
+
SBO 100
SBO 140
SBO 210
SBO 250
SBO 330
+
SBO 210
SBO 250
SBO 400
SBO 450
SBO 500
SBO 750		 Series - Welded Diaphragm
SBO 100 8:1 ratio 2 liters
SBO 140 8:1 ratio 1.4 liters
SBO 210 8:1 ratio .16, .32, .5, .75, 1, 1.4, 2 liters; 4:1 ratio 2.8 liters
SBO 250 8:1 ratio .075 liters; 4:1 ratio 3.5 liters
SBO 330 8:1 ratio .6, .75, 1.4, 2 liters; 4:1 ratio 3.5 liters
Series - Threaded Diaphragm
SBO 210 10:1 ratio 1.3 liters
SBO 250 10:1 ratio 2 liters
SBO 400 10:1 ratio 1.3 liters
SBO 450 10:1 ratio .6 liters
SBO 500 10:1 ratio .1, .25 liters
SBO 750 10:1 ratio .25 liters

 
Welded type (non repairable) 8:1 Pressure Ratio for Versions E1, E2 and E4
Series Size in liters Eff. Gas Vol. in³ Max. Wrk. PSI Max. Wrk. BAR Weight lbs. max. Housing Height in. Fluid Valve Height in. Gas Valve Height in. Vessel Dia. in.† SAE Thread NPTF Thread‡ Fluid Valve Hex in. Max. Discharge Flow Rate gpm
SBO 250 .075 5 3600 250 1.5 2.68 E1= 0.83 E1= 0.91
 
E2= 0.08
 
E4= 1.63		 2.52 9/16-18 UNF 3/8" 1.18 10
SBO 210 .16 10 2600*
3000		 180*
210		 1.8 3.15 2.91
SBO 210 .32 20 2400*
3000		 160*
210		 2.9 3.66 3.66 3/4-16 UNF 1/2" 25
SBO 210 .5 30 3000 210 3.7 4.35 4.13
SBO 330 .6 36 4700 330 7.3 5.04 4.53 1.61
SBO 210 .75 45 2000*
3000		 140*
210		 6.2 4.88 4.76
SBO 330 .75 45 4700 330 8.9 4.78 4.96
SBO 210 1 60 3000 210 7.9 5.39 5.35
SBO 140 1.4 85 2000 140 8.6 5.91 5.71
SBO 210 1.4 85 3000 210 11.9 6.14 5.91
SBO 330 1.4 85 4700 330 16.6 6.33 6.1
SBO 100 2 120 1500*
1500		 100*
100		 8.8 6.57 6.30 1-1/16-12 UNF 3/4" 1.18 40
SBO 210 2 120 3000 210 14.6 6.81 6.57
SBO 330 2 120 4700 330 17.7 7.12 6.77
Welded type (non repairable) 4:1 Pressure Ratio for Versions E1 and E4
SBO 210 2.8 170 3000 210 18.0 8.94 E1= 0.83 E1= 0.91
 
E2= 0.08
 
E4= 1.63		 6.57 1-1/16-12 UNF 3/4" 1.81 40
SBO 250 3.5 230 3000 210 24.6 11.14 6.69
SBO 330 3.5 230 4700 330 30.6 10.78 6.77

 
Threaded type (repairable) 10:1 Pressure Ratio for Version A6
Series Size in liters Eff. Gas Vol. in³ Max. Wrk. PSI Max. Wrk. BAR Weight lbs. max. Overall Height in. Fluid Valve Height in. Overall Dia. in. Vessel Dia. in. SAE Thread Fluid Valve Hex in. Max. Discharge Flow Rate gpm
SBO 500 .1 6 7200 500 4.2 4.33 1.18 3.74 2.68 3/4-16 UNF 1.26  
SBO 500 .25 15 5000*
7200		 350*
500		 8.6 5.04 0.79 4.53 3.62 1.42
SBO 750 .25 15 8700*
10000		 600*
750		 19.8 5.35 0.43 6.02 4.49 1.42
SBO 450 .6 36 3600*
4700		 250*
330		 12.6 6.69 0.75 6.02 4.49 1.61
SBO 210 1.3 80 3000 210 18.7 7.48 0.31 6.69 5.71 1.26
SBO 400 1.3 80 5800 400 24.7 7.75 1.10 7.91 6.30 1.97
SBO 250 2 120 2600*
3600		 180*
250		 25.1 8.93 0.67 7.91 6.61 1-1/16-12 UNF 1.61
* Stainless steel for chemical, water and oil service.
† Diameter at electron beam weld may be up to +0.150" larger.
‡ May be supplied with adapter.

 
If you are located in Missouri, Kansas, Nebraska, or Illinois, you may contact us at the following telephone and fax numbers with your requests or questions:
St. Louis telephone 314.428.4000 fax 314.428.4097
Kansas City telephone 913.829.5900 fax 913.829.0815
 
For ALL OTHER AREAS Please use the Info Request form for specific product information, pricing or other information. Please include company name, contact name, address, phone number and fax number to ensure a timely response.
 
Send e-mail to webmaster@flo-products.com with questions or comments about this web site.
Copyright © 2003 Flo-Products Company
Last modified:
Brochure: A 3.100.14/9.98