HYDAC SB 600 User Manual

Accumulators

SB 210 / 600

Bladder Accumulators

Service and Parts

Index

1. General

Bottom Repairable Bladder Accumulators

2. Spare Parts List

2.1 Torque Requirements

3. Maintenance Instructions

3.1 Disassembly

3.2 Inspection Of Components

3.3 Assembly

Top Repairable Bladder Accumulators

4 Spare Parts List

4.1 Torque Requirements

5 Maintenance Instructions

5.1 Disassembly

5.2 Inspection Of Components

5.3 Assembly

To safeguard against a potential source of danger which can occur in bladder and diaphragm accumulators, we would like to draw your attention to the following information.

Please note that this should be taken into account when carrying out any work on systems with hydraulic accumulators.

After discharging and/or completely draining the accumulator (e.g. to depressurize the hydraulic system before work is carried out), the accumulator can build-up an amount of pressure again when

CAUTION!

the lines are later shut off on the ﬂuid side.

This problem must be taken into account generally and in particular before carrying out work on hydraulic systems which include connected hydraulic accumulators.

All the ﬂuid-side lines connected to the accumulator must therefore be depressurized and after that the lines remain open. Only then may the appropriate work (e.g. disassembly of the accumulator) be carried out.

WARNING!

Hydraulic accumulators are pressurized vessels and only qualiﬁed technicians should perform repairs. Never weld, braze or perform any type of mechanical work on the accumulator shell. Always drain the ﬂuid completely from the accumulator before performing any work, such as recommended repairs or connecting pressure gauges.

Special Tools Required:

1. HYDAC Charging and Gauging Unit:

• For bottom repairable bladder accumulators:

FPS or FPK with adapter FPK/SB may be used.

• For top repairable bladder accumulators only the FPK

with adapter FPK/SB may be used.

2. Gas Valve Core Tool

3. Spanner Wrench(es)

4. Bladder Pull Rod

5. Sockets 27mm / 32mm (top repairable only) / 36 mm

6. Blunt Flathead Screwdriver (with rounded edges)

NOTE: Additional standard tools are required including but not

limited to: Soft Faced Hammer / Sockets / Torque Wrenches / anti seize compound for stainless steel assemblies.

Refer to additional information contained in the “Operating and Installation Instructions for HYDAC Accumulators”.

The instructions included in this brochure cover Bottom Repairable and Top Repairable Bladder Accumulators.

Before servicing a bladder accumulator obtain the appropriate HYDAC repair kit. Use only original HYDAC replacement parts.

Read all instructions thoroughly before beginning any type of service or repair work.

PRESSURIZED VESSEL USE DRY

NITROGEN GAS ONLY

Please refer to HYDAC Operating

and Installation Instructions

CAUTION!

PN# 02073469 / 07.14 / ACU1102-1326

NOTE: All details subject to technical modification

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Maintenance

15 16

2. Replacement Parts Drawing: SB210, SB330, SB330H, SB330N, SB400, SB500, SB550 SB600, SB600N

Detail Z

Detail Z (SB...S11...similar)

Item Description:

1 Shell

2 Bladder

3 Gas Valve Core

4 Bladder Stem Lock Nut

5 Valve Seal Cap

6 Valve Protection Cap

5 3

7 O-ring

8 Name Plate

9 Fluid Port

14 Anti-extrusion Ring

15 Flat Ring

16 O- ring

17 Spacer Ring

18 Fluid Port Lock Nut

19 Fluid Port Vent Screw

20 Seal Ring

23 Back-up Ring

Detail X

SB 210 SB 330: size 1 to 54 SB 600: size 1 to 4 SB 330N: size 1 to 54 SB330/400 (european mfg )0.5 to 6L

SB 600: size 10 to 54 SB 600N: size 10 to 54 SB330/400/500/550 (european mfg)10 to 50L

15 16

Repair Kit Consists Of:

2 Bladder

3 Gas Valve Core

4 Bladder Stem Lock Nut (SB 600 only)

5 Valve Seal Cap

7 O-Ring

15 Flat Ring

16 O-Ring

23 Back-up Ring

(where applicable)

All SB 50L assemblies use the M50

(2” ) diameter gas valve, not the M22 (7/8”) diameter gas valve.

2.1 Torque Requirements: Bottom Repairable Bladder Accumulators in Nm (lb-ft)

Part Name SB 210/ SB 330 / SB330N SB 330 H / SB 400 / SB500 SB 550 SB 600 / SB 600N

1 4 to 6 10 to 54 10 to 20 1 to 5 1 to 4 10 to 54

Gas Valve Core 0.5 (0.4) 0.5 (0.4) 0.5 (0.4) 0.5 (0.4) 0.5 (0.4) 0.5 (0.4) 0.5 (0.4) Bladder Stem Lock Nut 80 (59) 80 (59 ) 80 ( 59) 80 (59 ) 80 (59) 80 (59) 15 0 (111 ) Valve Seal Cap 30 (22) 30 (22) 30 (22) 30 (22) 30 (22) 30 (22) 30 (22) Fluid Port Lock Nut 90 (66) 200 (148) 440 (325) 600 (443) 15 0 (110 ) 200 (148) 440 (325) Vent Screw

1) For SAE threads only. For other thread types, consult HYDAC.

4 (3) 22 (16) 30 (22) 30 (22) 4 (3) 22 (16 ) 30 (22)

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PN# 02073469 / 07.14 / ACU1102-1326

Maintenance

3. Bottom Repairable Bladder Accumulators

3.1 Disassembly

A After removal from the system, place the accumulator in a vice or secure it to a workbench.

Remove valve protection cap (item 6) and unscrew valve seal cap (item 5). Attach the proper HYDAC Charging and Gauging Unit and completely relieve the gas precharge

(refer to HYDAC Charging and Gauging brochure #02068202).

Remove gas valve core (ite m 3) by using the gas valve core tool.

B Unscrew vent screw

Unscrew lock nut ( item 18) by using spanner wrench. Remove spacer ring (i te m 17) .

If necessary, tap spacer ring with a plastic hammer to loosen.

C Loosen ﬂuid port (item 9 ) and push it into the shell. Remove back-up ring, (item 23)

where applicable, O-ring (it em 16 ) and ﬂat ring (it em 15 ) from ﬂuid port.

D Pull anti-extrusion ring ( it em 14 ) off ﬂuid port and remove it through ﬂuid side opening

by folding it in half.

E Remove ﬂuid port

F Remove bladder stem lock nut (item 4 ) and name plate (item 8 ) from the gas side.

Remove bladder (item 2) from ﬂuid side. It may be necessary to fold the bladder lengthwise to remove it.

3.2 Inspection of Components

Shell:

• inside to ensure it is free of debris, rough spots, or chafe marks.

• ﬂuid side bore for damage which could hamper proper sealing.

• exterior for any sign of damage.

If any interior or exterior damage is found, contact HYDAC for proper repair or replacement instructions.

Bladder:

The bladder must be checked for leakage. Reinstall gas valve core (item 3 ) and charge the bladder with nitrogen or compressed air to its natural shape and inspect for leakage.

If leakage occurs, ﬁrst check the gas valve core ( item 3) and replace it if necessary. If leakage still occurs, then the bladder must be replaced. The bladder must be visually inspected for lateral grooves and deep chafe marks. If any are found, the bladder should be replaced. Shallow chafe marks are insigniﬁcant and will not hamper performance.

Note: Bladders can not be repaired or revulcanized !

Fluid Port:

Depress poppet and rotate 90° to ensure free movement. Visually inspect poppet, threads, and sealing surfaces for any damage. If any damage is found, the ﬂuid port should be replaced.

Vulcanized Anti-extrusion Ring:

Visually check vulcanized area between steel and rubber to make sure it is undamaged and that adhesion is still good (no gaps between rubber and meta l). If the adhesion is poor or the rubber is cracked or shows signs of embrittlement or aging, replace anti-extrusion ring. Also check the seat area on the steel parts for grooves or any other damage. If any are found replace anti-extrusion ring.

Non-Vulcanized Anti-extrusion Ring:

Visually inspect area between the steel and rubber to make sure that the steel ring is properly seated. If the rubber is cracked or shows signs of embrittlement or aging, replace anti-extrusion ring. Also check the seat area on the steel parts for grooves or any other damage. If any are found replace anti-extrusion ring.

Seals:

New seals should always be used whenever reassembling any bladder accumulator.

Other Parts:

Inspect for damage and replace if necessary.

(i tem 19) and remove seal ring (item 20).

(item 9).

PN# 02073469 / 07.14 / ACU1102-1326

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