VBA-MM-N010-E

Maintenance Manual

Booster Regulator
VBA10A
－Contents－

1. Foreword････････････････････････････････････P.1

2. Maintenance of cylinder and body･･････････････ P.2

3. Maintenance of governor･･････････････････････ P.4

4. Replacement parts list････････････････････････ P.5

1. Foreword
When the booster regulator is disassembled and reassembled for maintenance, read and follow this
manual.
The maintenance period depends on the air quality and operating conditions, but when either of the
following situations occurs, the booster regulator should be considered to be reaching the end of its life, and
maintenance should be performed sooner.
1. The handle is bleeding all the time.
2. Exhaust sound can be heard at intervals of 10 to 20 seconds without air consumption on the
secondary side.

Start

・Check that air pressure is exhausted from the IN and OUT sides.
Preparation
・Disconnect piping. The size of tool prepared for disconnection should be suitable
for the type of piping.

Removal
・Remove the tank (VBAT05※, 10※) from the booster regulator. For removal, use a
hexagon wrench.

Disassembly
・The tools prepared for disassembling the booster regulator should be as shown in
◆Necessary tools◆ on the applicable pages.
・Disassemble in accordance with the procedure from page 2 to 4.

Replacement ・Wipe off any dirt from the sliding face and dust from the mesh filter.
・Check the condition of parts. If there are any scratches or abrasion, replace the
part with a new one listed on page 5.
・If the silencer is clogged inside, replace it as well.
・Gather replacement parts to one place to prevent them getting mixed up during
reassembly.

Reassembly ・Assemble in accordance with the procedure from page 2 to 4.

・At the end, check you have not forgotten to assemble any parts or tighten
any screws.

Mounting
・Put back the disassembled parts to their original position.

Inspection
・Supply air, rotate the handle clockwise and set the pressure.
・Check for external leakage with soapy water.
・If any abnormal phenomenon is seen, please contact SMC sales branch.

Finish
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2. Maintenance of cylinder and body

2.1 Maintenance of cylinder

◆Necessary tools◆◆
Socket wrench, Nominal 10mm (2pcs)
Hexagon wrench, Nominal 5mm
Looseness preventive adhesive (Loctite 263, etc.)
Grease package (Multi-purpose2, etc.)
◆Disassembly procedure◆ ◆
1) Check air pressure is exhausted from the IN and OUT sides.
2) Remove the pressure gauge and the silencer first if they are mounted.
3) Remove the eight hexagon socket head cap screws (8) on the left and the right with a hexagon wrench.
4) Take off the side covers (6) on the right and left.
5) Loosen the piston nut (7) with the socket wrench and remove the piston (4).
(Remove only one of the piston nuts either on the left hand side or the right hand side.)
◆Maintenance and check◆ ◆
1) Check there is no abrasion, deterioration and deformation of any part. If there is, replace it with new one.
2) If there is any part whose motion is not smooth, wipe off dirt and apply grease.
3) If you move onto maintenance of the body, refer to 2.2 Maintenance of body (P.3).

◆Reassembly◆ ◆
1) Apply grease to the part marked with in Fig. 1.
2) Pass the piston rod (3) through the body (1) and assemble the piston (4).
3) Apply one drop of Loctite to the thread of the piston nut (7) and tighten it with the socket wrench.
(Torque 5.2Nm) The piston is not fixed completely (idles) if it is assembled correctly. Do not
tighten it over the necessary torque.
4) Mount the cover (6) to the body (1) after the cover gasket is mounted to the cover (6).
5) Fix the cover (6) by tightening four hexagon head bolts (8) on each side of the cover (eight bolts in
total).
(Torque 3Nm)
(8)
◆Check◆ ◆ (6)
1) Check the bolts and nuts are tightened
to adequate torque. (7)
2) Supply air and check pressure setting (5)
can be performed. (4)
(2)
3) Check there is no leakage from
connected parts with soapy water.

(2)
(3)
(4)
(5)
(6)
(8)
Apply grease to the
part seal

(1)

Fig.1

Apply grease to the

part cover

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2.2 Maintenance of body

◆Necessary tools◆ ◆
Flat blade screwdriver
Pair of tweezers
Turbine oil (Turbine oil 32 class 2, Exxon Mobile or similar)
Grease package (Multi-Purpose 2, etc)
◆Disassembly◆ ◆
1) Take off the side plates (2) on the right and left.
2) Remove the side plate insert A (3) and the side plate insert B (4) on the left and right with a flat blade
screwdriver.
3) Take out the check valves (5) through (7) from the body (1).
4) Take out the switch valves (9) though (13) from the body (1).
5) Take out the rod seal (14) from the body (1) with a pair of tweezers.
◆Maintenance and check◆ ◆
1) Check there is no abrasion, deterioration and deformation of any part. If there is, replace it with new one.
2) The end of IN port has a mesh filter built in. Remove dust from the filter by air blowing.
3) If there is any part whose motion is not smooth, wipe off dirt and apply grease. Apply one drop of
Turbine oil to the switch valve.
◆Reassembly◆ ◆
1) Mount the switch valves (9) through (13). (These are precision parts and should be handled with care.)
2) Mount the check valves (5), and (7) on one side, and mount the side plate insert A (3) which is
mounted with the side plate insert gasket A (15) and the side plate insert B (4) which is mounted with
the side plate insert gasket B (16), then mount the side plate (2) on them. It should be noted the
check valves (5) have different mounting directions.
3) Assemble the check valves on the other side. At this time, hold down the spring to overcome its
reaction force.
Side plate insert A (3) and side plate insert B (4) are different between the parts for the left and the right.
◆Check◆◆
1) Check the springs are mounted in place and the check valve (5) and switch valve (9) move smoothly.

(14)
(7)
(6)
(5)
(5) (2)
(12) (6) (16)
(10) (7)
(13)
(9)
(4)
(10)
(11) (15)
(12)
(5)
(6)

※Meshfilter
(1)
(6)
(5)
(15)
(3)
(13) Fig.2
(16)
(2) -3-
3. Maintenance of governor

◆Necessary tools◆ ◆
Phillips screwdriver
Pair of needle nose pliers
◆Disassembly◆ ◆
1) Check air pressure is exhausted from the IN and OUT sides.
2) Rotate the handle counterclockwise back to the end (in the negative direction).
3) Remove four cross recessed round head screws (12) with the Phillips driver.
4) Remove the bonnet assemblies (10) and (11), the regulating screw assembly (9), the regulating spring
(8), the regulating piston assembly (7), the relief spring (6), and the relief valve (5).
5) Remove the governor chamber assembly (4), the valve assembly (3) and the valve spring (2) with a pair
of needle nose pliers.
◆Maintenance and check◆ ◆
1) Check there is no abrasion, deterioration and deformation of any part. If there is, replace it with new one.
2) If there is any part whose motion is not smooth, wipe off dirt and apply grease.
◆Reassembly◆ ◆
1) Mount the valve spring (2) and the valve assembly (3) to the body (1), and then fit the governor chamber
assembly (4) to the body.
2) Mount the relief spring (6) and the relief valve (5) to the regulating piston assembly (7), and then, put
them into the governor chamber assembly (4). Put the regulating spring (8) and the regulating screw
assembly (9) on them.
3) Put on the bonnet assemblies (10) and (11) and tighten them with four cross recessed round head
screws (12) using the Phillips screwdriver. (Torque: 0.76Nm)
◆Check◆ ◆ (12)
1) Check the cross recessed round head screws (12) are
tightened and supply air. (11)
2) When air pressure is supplied, it will start to relieve air.
Quickly rotate the handle in the clockwise direction (in (10)
the positive direction) until it stops relieving air.
3) Check pressure setting to the necessary pressure can (9)
be performed with the handle.
4) Check there is no leakage from connected parts with
soapy water. (8)

(7)

(6)

(5)

(4)

(3)

(2)
※ Maintenance of the governor can be
performed without removing the cover part.
(1)

Fig.3

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4. Replacement parts list

The replacement parts can be ordered with the following part numbers.
Each set includes the components shown on the right of this table. Refer to the drawing number and item
number in this manual to check each part.

Component
Part number Description Drawing Item
Description Qty.
No. No.
Piston seal 2 Fig. 1 (5)
Rod seal 1 Fig. 2 (14)
Governor gasket 2 Fig. 1 (2)
Booster regulator
Valve assembly 1 Fig. 3 (3)
KT-VBA10A-1 maintenance
Governor chamber assembly 1 Fig. 3 (4)
parts set
Check valve 4 Fig. 2 (5)
Valve spring 1 Fig. 3 (2)
Grease package 1 － －
Switch valve assembly 1 Fig. 2 (9)
Exhaust sleeve 2 Fig. 2 (10)
KT-VBA10A-2 Switch valve set Travel spring 1 Fig. 2 (11)
Push rod 2 Fig. 2 (12)
O-ring 2 Fig. 2 (13)
Governor chamber assembly 1 Fig. 3 (4)
Valve assembly 1 Fig. 3 (3)
Governor Valve spring 1 Fig. 3 (2)
KT-VBA10A-3
chamber set Regulating piston assembly 1 Fig. 3 (7)
Relief valve 1 Fig. 3 (5)
Relief spring 1 Fig. 3 (6)
Piston seal 2 Fig. 1 (5)
Rod seal 1 Fig. 2 (14)
KT-VBA10A-4 Seal kit
Governor gasket 2 Fig. 1 (2)
Grease package 1 － －
Check valve 4 Fig. 2 (5)
Check valve spring 4 Fig. 2 (6)
Plunger 2 Fig. 2 (7)
Side plate insert A 1 Fig. 2 (3)
KT-VBA10A-5 Check valve set
Side plate insert B 1 Fig. 2 (4)
Side plate gasket A 2 Fig. 2 (15)
Side plate gasket B 2 Fig. 2 (16)
Grease package 1 － －
Bonnet 1 Fig. 3 (10)
KT-VBA10A-6 Bonnet set
Handle 1 Fig. 3 (11)

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