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Series 111 Accumulators

Maintenance

Checking the Accumulator Precharge

Special equipment

The following equipment is for any Series 111 Accumulator:

•

Accumulator charging kit (MTS part number 376986-01)

Procedure

To check your accumulator precharge, perform the following:

Accumulators are pressurized devices.

Pressurized accumulators and their parts can become lethal projectiles if
disassembled and can cause death to persons and/or damage to
equipment.

Do not remove an accumulator that is pressurized. Completely remove hydraulic
pressure and discharge the accumulator before any parts, except the protective

cover and valve stem cap are removed.

1. Ensure that system hydraulic pressure has been reduced to zero before

proceeding. To do this, turn off the hydraulic power unit and exercise
the actuator until it stops moving.

2. Close the bleed valve on the accumulator charging kit. Remove the

protective cover and valve stem cap from the accumulator (see

“Accumulator Components”

on page 11 and the figure below).

3. Go to the appropriate procedure on the next page.

WARNING

Extension Hose

Accumulator Charging Kit

Bleed Valve

Input

Check Valve

Open

Nitrogen Supply Hose

Regulator Output

Pressure Gage

THESE ITEMS SUPPLIED BY USER

Nitrogen Bottle

Pressure Gage

Regulator

Shut-Off Valve

Regulator Output

Pressure Valve

Nitrogen

Bottle Valve

Chuck Valve

Gage Protector

(factory set to limit

pressure to the gage

to approximately

200 psi (1.4 MPa)

High Pressure Gage

0-3000 psi (0-21 MPa)

Nitrogen

Bottle

Low Pressure Gage

0-300 psi (0-2.1 MPa)

Core Type

Accumulator Valve

To Open and Close

Use Chuck Valve

Open

Valve Core

Valve Stem

Poppet Type

Accumulator Valve

To Open and Close

Use Locknut

Open

Valve Stem

Locknut

Содержание 111 Series

Страница 1: ...Series 111 Accumulator Product Information l 011 553 304 B Model 111 11 Model 111 12 ...

Страница 2: ...within the U S or Canada Phone 612 937 4000 outside the U S or Canada Fax 612 937 4515 E mail info mts com http www mts com Publication information ISO 9001 Certified M ANUAL P ART N UMBER P UBLICATION D ATE 115533 00A December 1982 115533 01A August 1983 115533 02A September 1984 115533 03A June 1987 115533 03B February 1988 115533 03C February 1989 115533 03D June 1990 115533 03E November 1991 1...

Страница 3: ...ction 5 Functional Description 6 Specifications 7 Installation 9 Maintenance 11 Checking the Accumulator Precharge 13 Changing the Precharge Pressure 15 Purging Fluid from the Gas Chamber 17 Removing the Accumulator 18 Replacing the Accumulator Seal 19 ...

Страница 4: ...Series 111 Accumulators 4 ...

Страница 5: ...d to a flange and typically has a larger nitrogen gas capacity than the Model 111 11B Contents Functional Description 6 Specifications 7 What you need to know MTS Systems Corporation assumes that you know how to use your controller See the appropriate manual for information about performing any controller related step in this manual s procedures You are expected to know how to perform the followin...

Страница 6: ...rom the servovalve and actuator This has the effect of keeping fluid in the lines in motion and reducing the inertia and line restriction considerations When the servovalve opens and line pressure begins to drop the accumulator in the hydraulic service manifold HSM immediately supplies part of the fluid volume and maintains the line pressure Then when the servovalve closes the hydraulic power supp...

Страница 7: ...red with different capacities lengths or hydraulic fluid port connections than listed here Contact MTS Systems Corporation for information on nonstandard models NITROGEN GAS CAPACITY LENGTH See the figures on the next page A B HYDRAULIC FLUID PORT CONNECTION MAXP cm in cm in cm in KG LBS 111 11B 01 82 cm3 5 in 3 15 54 6 12 7 87 3 1 6 35 2 5 12 SAE 1 1 16 12 UNF 2B 4 26 9 4 111 11B 02 164 cm3 10 in...

Страница 8: ...C Accumulator Cross section A B Hydraulic Fluid Port Locking Pin Length Typical Boss Adapter Fitting Ref 1 563 in 39 7 mm Protective Cover Accumulator Valve Assembly ReliefVent Length Protective Cover Hydraulic Fluid Port Locking Pin Ref 1 406 in 35 7 mm Ref 0 703 in 17 8 mm Ref 2 750 in 69 9 mm Ref 1 375 in 34 9 mm 1 2 13 UNC 2B Accumulator Valve Assembly Relief Vent Ref 1 563 in 39 7 mm B A ...

Страница 9: ... Model 111 12C Accumulator is flush mounted with four bolts and O ring seal s When the accumulator is ordered as a component the four bolts grade 8 and O ring seal s max size 54 28 mm 2 137 in outside diameter 47 22 mm 1 859 in inside diameter are not included with the accumulator and must be purchased separately Mounting Configurations Required equipment The following equipment is required for ac...

Страница 10: ...e 9 to complete the following procedure 1 Mount the accumulator in the system after lubricating the mounting O ring seal s Note the O ring seal configuration For the Model 111 11B Accumulator Thread the unit onto the boss adapter fitting and securely tighten it with a strap wrench For the Model 111 12C Accumulator Lubricate and torque the four mounting bolts in increments according to the pattern ...

Страница 11: ...umulator Components Use the following guidelines to determine when maintenance is required Check the precharge pressure at periodic intervals The length of time between checks depends on how the system is used Some factors to consider when establishing this time interval are operating frequency displacement and duration Start with one month intervals until you determine another interval is more ap...

Страница 12: ...tained within the limits remove the fluid and charge the accumulator If the levels are again exceeded at the first check interval replace the piston seals after the initial fluid has been changed If the precharge pressure level decreases at each check interval this indicates gas leakage to the fluid side When the precharge pressure level cannot be maintained within the limits stated in the previou...

Страница 13: ...ic power unit and exercise the actuator until it stops moving 2 Close the bleed valve on the accumulator charging kit Remove the protective cover and valve stem cap from the accumulator see Accumulator Components on page 11 and the figure below 3 Go to the appropriate procedure on the next page WARNING Extension Hose r Accumulator Charging Kit Bleed Valve Input Check Valve Open Close Nitrogen Supp...

Страница 14: ...r a core type valve as shown on the previous page 1 Determine which type of gas pressure valve is present on the accumulator and connect the charging kit chuck valve to the accumulator valve stem 2 Open the locknut poppet type or chuck valve core type Note The poppet type valve opens by turning the locknut counterclockwise and closes by turning the locknut clockwise To open a core type valve attac...

Страница 15: ...to an accumulator s charges Before you begin Go to Checking the Accumulator Precharge on page 13 to determine if you need to change the precharge pressure Decreasing pressure Complete the following steps to decrease the precharge pressure 1 Slowly open the bleed valve on the accumulator charging kit until gas begins to escape When the pressure reading on the appropriate pressure gage drops to the ...

Страница 16: ...om the accumulator charging kit bleed valve Allow gas to slowly escape for approximately ten seconds then close the bleed valve Immediately close the regulator shut off valve before the pressure reading on either the high or low charging kit pressure gage exceeds the pressure level of the accumulator 7 Open the locknut or open the chuck valve for a core type valve Slowly open the regulator shut of...

Страница 17: ...ves safety glasses and ear plugs when working with pressurized gases Procedure Complete the following steps to purge the fluid from the gas chamber See Accumulator Components on page 11 1 If the valve stem of the accumulator is facing down go directly to step 2 If the valve stem of the accumulator is facing up or the accumulator is on its side remove the accumulator as described in Removing the Ac...

Страница 18: ...c pressure has been reduced to zero before proceeding To do this turn off the hydraulic power unit and exercise the actuator until it stops moving 2 Place a drain pan under the accumulator to be removed 3 To prevent contamination of the hydraulic fluid cover any ports that are exposed 4 If you have the Model 111 12C Accumulator use a hex key to remove the flange and accumulator mounting bolts see ...

Страница 19: ...ocknut on the accumulator valve assembly two or three full turns Allow gas pressure to reduce to zero and any hydraulic fluid to be expelled 4 Use an open end wrench and remove the accumulator valve assembly from the end cap To remove the end cap hold the accumulator body with a strap wrench insert the spanner wrench pins into the screw holes in the end cap and rotate the wrench counterclockwise 5...

Страница 20: ...irmly push the piston 2 to 3 inches 5 to 7 cm into the cylinder 9 Apply a small amount of clean hydraulic fluid to the end cap seal and backup ring Turn the end cap into the cylinder until the threads are engaged Note Do not overtighten the end cap Tightening the end cap with extreme force does not improve the seal and can damage the cap and or cylinder threads Tighten the end cap using the follow...

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