Model BGA Operation ManualThis document contains trade secrets owned by us
and our partners. Refrain from using it for
purposes other than this submission (lease). Do not
publish or disclose the information contained
herein to third parties.
NIPPON GEAR CO., LTD.

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L2U-M65-0002 rev.1

Contents
1. Preface・・・・・・・・・・・・・・・・・・・・・・・
1.1 About this Operation Manual
1.2 Acceptance check1.3 Product warranty
1.4 Safety precautions

P.3

2. Overview・・・・・・・・・・・・・・・・・・・・・・・・

P.5

3. Model and Sizes・・・・・・・・・・・・・・・・・・・・・

P.5

4. Specifications・・・・・・・・・・・・・・・・・・・・・・

P.5

5. Structure and Adjustment・・・・・・・・・・・・・・・・

P.5

5.1 Main unit
5.2 Opening indicator
5.3 Limit switch
5.4 Fitting gear (A1) ⑦ according to the rotation directionof needle ⑨ of the opening indicator-attached type
6. Maintenance and Inspection・・・・・・・・・・・・・・・

P.8

6.1 Grease
6.2 Grease inspection and replacement procedures
7. Electric Parts Specifications・・・・・・・・・・・・・・・

P.9

7.1 Opening indicator- and limit switch-attached type
8. Structural Drawings・・・・・・・・・・・・・・・・・・・

P.10

8.1 Structural drawing of the basic type of Model BGA
8.2 Structural drawing of the opening indicator of Model BGA
9. Environment・・・・・・・・・・・・・・・・・・・・・・

P.12

10. Contact After Delivery・・・・・・・・・・・・・・・・・

P.12

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1.

Preface
1.1 About this Operation ManualThis manual is intended for persons in charge of operating and maintaining the subject
device to use it properly. Before starting operation or maintenance, be sure to readthrough this operation manual.
To the device manufacturer: Be sure to hand over this operation manual to themaintenance manager at the end user.
1.2 Acceptance check
If the received product seems to be damaged during transportation or if you collate thereceived items with the delivery list and find some items missing, contact us and thetransport company within 1 week after you receive the product.
1.3 Product warranty(1) Warranty period
The product is to be warranted for 2 years from the shipment from our factory or 1 year
from the start of operation at site, whichever is earlier.
(2) Warranty coverage
Our products are to be warranted for the period determined at the time of contract when
they are used at the determined ratings under the determined operating conditions.
Accordingly, warranty is not covered even within the warranty period when a problem
occurs due to any of the causes listed below.
1) A failure caused due to the use of our product beyond the range of its specifications or
selection conditions
2) A failure caused by a reason not involved with the structure of our product as well as anatural disaster including a fire, flood, typhoon, or earthquake3) A failure caused due to modification or repair by a person other than our staff or aservice dealer specified by us
4) A non-conformity caused due to deterioration with age (including natural discolorationof coating, plating, or the like, rusting, deterioration of grease, and oil separation)5) A failure caused due to the failure of the user to perform preventive maintenance,
inspection, or maintenance that is specified in the operation manual or the like6) A failure caused due to an improper operation or handling
7) A sensory symptom (such as sound or vibration) that does not generally seem to affect
the quality and performance(3) Warranty information
Should a problem be found for which we are responsible during the warranty period, we
will replace the product with a new one or pay for the repair of the product.
This warranty is valid only within Japan.
The warranty covers only the cost to repair or replace the delivered product, notincluding the following costs induced by a failure in the delivered product.
1) Extra costs including the man-hour cost for removing the product from the actualmachine and mounting it to the machine, transportation cost required for redelivery,tax, and cost of the warehouse2) Costs of the loss of non-operation, opportunity, and others that is caused due to a
problem with the product3
L2U-M65-0002 rev.1

1.4 Safety precautions
This section describes important safety precautions on handing an actuator.
Before using an actuator, read these precautions to handle it properly.
Actuators should be handled only by trained professional operators.
(1) When receiving, transporting, and storing an actuator
Caution ・・・Prevent any accident due to dropping or the like.
Before slinging or craning an actuator, check the weight. Avoid stepping under thehung actuator and pay enough attention to safety during work.
If the cardboard box containing an actuator gets wet, the packaging strength may be
reduced. For this reason, carefully store and handle the box containing an actuator.
If these precautions are not observed, an injury accident may occur.
(2) When installing and testing an actuator
Caution ・・・Prevent any accident due to dropping or falling.
Before slinging or craning an actuator, check the weight. Avoid stepping under thehung actuator and pay enough attention to safety during work.
Before starting work, secure the safety of footing. Avoid work on unstable piping or thelike.
When removing and mounting covers, consider their weights and pay enough attention
to safety during work.
If these precautions are not observed, an injury accident may occur.
Caution ・・・Prevent any accident due to improper operations.
Do not use any tool to handle the hand wheel.
If this precaution is not observed, an injury accident may occur.
(3) Control of maintenance, maintenance checkup, and others
Caution ・・・Prevent any accident due to dropping or falling.
Before slinging or craning an opening/closing machine, check the weight. Avoid
stepping under the hung opening/closing machine and pay enough attention to safety
during work.
Before starting work, secure the safety of footing. Avoid work on unstable piping or thelike.
When removing and mounting covers, consider their weights and pay enough attention
to safety during work.
If these precautions are not observed, an injury accident may occur.
Caution ・・・Prevent any accident due to improper operations.
Do not use any tool to handle the hand wheel.
If this precaution is not observed, an injury accident may occur.

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2. Overview
Model BGA is a bevel gear reducer. You can easily perform manual opening/closing by
mounting it directly on a gate valve or globe valve subject to thrust load.
3. Model and Sizes
The model is called BGA, and is available in 7 sizes, types 04 to 4. Each size is available in the
basic

type,

opening

indicator-attached

type

(P),

and

position

indicator-

and

limit

switch-attached type (S). (BGA-4 is only basic type.)
It is also available in the orthogonal biaxial type, called by BGAW.
BGA-: Basic type
BGA-P: Position indicator -attached type
BGA-S: Position indicator - and limit switch-attached type
BGAW-: Orthogonal biaxial type

4. Specifications
Table 1 lists the specifications.
Table 1: Specifications of the BGA bevel gear reducer of each sizeType

BGA-04

BGA-00

BGA-0

BGA-1

BGA-2

BGA-3

BGA-4

Gear Ratio

2:1

2.5:1

3:1

4.11:1

6:1

9:1

10:1

Allowable thrust (N)26,00062,00098,000200,000

340,000

620,000 1200,000

Allowable torque (N･m)

110

340

740

1,500

2,900

5,900

12,000Rising
stem

φ40

φ46

φ55

φ62

φ85

φ115

φ130

Non-rising
stem

φ30

φ38

φ45

φ52

φ70

φ95

φ110

Item

Maximum
stem
diameter(mm)

5. Structure and Adjustment
The structure and the adjustment method are as described below.
5.1 Main unit
The main unit structural drawing is shown in “8. Structural Drawings” on page 10.
Rotation of the manual handle is transmitted from straight bevel gear (A) ④ to drive sleeve ③
via the hammer blow-attached claw clutch of straight bevel gear (B) ⑤ to rotate stem nut ⑪,
engaged with the involute spline and operates the valve stem.
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L2U-M65-0002 rev.1

5.2 Opening indicator
A structural drawing of the opening indicator is shown in 8. Structural Drawings on page 11.
With the rotational force of the manual handle, gear ②, fixed on the same shaft as that ofstraight bevel gear (A), rotates, which is decelerated with gear ⑤ via gears ③, ④, and ㉚ to㊱. Via gears ④, ⑲, and ⑤ or ④, ⑳, and ⑤ depending on the rotation direction of the handle,
shaft ⑪ is rotated to rotate needle ⑩.
If, by any chance, needle ⑩ rotates in a direction opposite to the one in the specifications,remove cover ⑮ first and then clamp plate ⑭, loosen the hexagon socket setscrews of gear ㉖,
change the orientation of the gear, and fix it with the hexagon socket setscrews.
When reattaching the cover ⑮, apply liquid packing.
This structural drawing shows a 6-stage reduction gear set. A 7-stage one may be used if alarger reduction ratio is necessary.
5.3 Limit switch
The structure of the limit switch is shown in Figure 1, and the components are listed in Table
2.
The opening indicator-attached type (opening indicator being explained in Section 5.2) rotatesneedle shaft ① in this figure to rotate gear ③ (small), fixed on the needle shaft. It rotates gear
④ (large), engaged with gear ③ (small), to rotate each of cams ⑦ on the open and closed sides,
which are fixed on the same shaft, and operates limit switch ⑩. To adjust limit switch ⑩,
remove case lid ⑤, loosen hexagon socket setscrews ⑧, which fix cams ⑦, and turn the cams.
After adjustment, tighten the hexagon socket setscrews to fix the cams.
Table 2: Limit switch
component table
015
014
013
012
011
010
009
008
007
006
005
004
003
002
001
Part
numberSquare plugE-shaped
retaining ring
Brimmed DU
bushing
Brimmed DU
bushing
Relay terminal
block
Limit switch

1

GasketHexagon socket
setscrewCam
Pillar for cam
Case lid
Gear (large)
Gear (small)
Case
Needle shaft

1Part name

1
1
2
1
2
1
1
1
1
1
1
2
1
Quantity

Figure 1: Structural drawing of the limit switch
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5.4 Fitting gear (A1) ⑦ according to the rotation direction of needle ⑨ of the opening
indicator-attached type
5.4.1. Orientation of gear (A1) ⑦ according to the handle rotation direction
Table 3: Orientation of gear (A1) ⑦ according to the handle rotation direction
Item

Handle rotation

Gear (A1) orientation

NeedleRemarks

direction

Scale plate side
Clockwise

Right

to openopen

to

Red indicator needle
Counter

Scale plate sideclockwisRight

e to open

open

to

The
rotation
direction of eachgear is shown.
In Figures 2 and3, gears ⑥ , ⑦ ,and ⑧ have thesame number ofteeth. In the gear
set, the pinion
gear is fixed.

Fixed

Red indicator needle

5.4.2. Gear rotation direction(A 6-stage gear set is shown here. For a 7-stage one, the positions of ⑥ and ⑧ in Figures 2
and 3 are switched.)

Note: The needle of ⑨ isrotated with ⑥ and ⑦.
⑧ is not engaged with ⑦.

Open

Open

Note: The needle of ⑨ isrotated with ⑥ , ⑧ , and ⑦ .
⑥ is not engaged with ⑦.
Open

Open

Figures 2 and 3 show views
as seen from the input side.
Figure 2: Structural drawing of a handle

Figure 3: Structural drawing of a handle that isthat is opened when rotated clockwise

opened when rotated counterclockwise

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L2U-M65-0002 rev.1

6. Maintenance and Inspection
6.1 Grease
The grease is adjusted to an appropriate amount before shipment from the factory, so that you
can operate this product without adjusting the amount.
The grease amount is as listed in Table 6.
To supply grease, use the lithium soap base grease of Shell Lubricants Japan K.K. (For BGA-4
only, use NGC-EP0 of NIPPECO LTD.)
When supplying grease, make sure that it is not contaminated with any dissimilar grease orforeign objects.
The operating temperature range of Alvania EP2 is -20C to +110C. Because of the structureof this product, however, the allowable temperature range is -20C to +90C. If you want to use
this product at a lower or higher temperature, contact us. (Table 4)
Table 4: Grease type
Manufacturer

Brand

Soap base

Shell Lubricants Japan K.K.

Shell Alvania EP2

Lithium

6.2 Grease inspection and replacement procedures
6.2.1 Grease inspection
Inspect the grease at least once a year. (If this product is used frequently, increase the numberof inspections.)
Remove the square plug and inspect the grease amount and the status of the grease near thegears. If the status of the grease is as listed in Table 5, take the appropriate one of themeasures listed in the table.
Table 5: Grease status and measures
Grease status

MeasureThe amount of grease is small.

Supply grease.

Syneresis has occurred causing soap
content to adhere to the gears, etc.

Disassemble this productand replace the grease.

Contaminated with water and turned
to milky white color.

Disassemble this productand replace the grease.

Contaminated with foreign objects.

Disassemble this productand replace the grease.

To retighten the removed plug, use seal tape (NITOFLON No. 95 or equivalent) and screw inthe plug securely.
8
L2U-M65-0002 rev.1

6.2.2 Grease replacement
If you use this product several times a day and no abnormality is found during greaseinspection, you can continue to use this product without grease replacement. In this case,replace the grease during an overhaul, which is to be performed every 5 to 10 years.
If this product is used more frequently, disassemble this product every 2 years and replace thegrease.
Do not remove the grease from Model GBA by, for example, washing with oil, without
dissembling.
Table 6: Grease amount according to size
Unit size

Grease amount (kg)

BGA-040.13

BGA-00

0.5

BGA-0

0.65

BGA-1

1.5

BGA-2

3.0

BGA-3

7.2

BGA-4

10.0

7. Electric Parts Specifications
7.1 Opening indicator- and limit switch-attached type
Limit switch (single pole double throw)(Figure 4)
Model: V-156-1C25
Manufacturer: OMRON Corporation

Figure 4: Circuit symbol of a single pole
double throw limit switch

Table 7: Limit switch specifications
Non-inductive load (A)

Item

Rated
voltage (V)Normally
closedRating

15 A

Resistance load

DC

ACNormally
open

Lumped load
Normally
closedNormallyopen

Inductive load (A)Electromotor
load

Inductive load
Normally
closedNormally
open

Normally
closedNormally
open

8
30

15
10

4
4

10
10

6
4

125

0.6

0.1

0.6

0.1

250

0.3

0.05

0.3

0.05

250

15

2

10

3

(Notes) 1. The inductive load is when the power factor is 0.4 or greater (AC) and the rating is
7 ms or less (DC).
2. The lumped load is assumed to have 10 times the inrush current.
3. The electromotor load is assumed to have 6 times the inrush current.
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8. Structural Drawings
8.1 Structural drawing of the basic type of Model BGA.

Figure 5: Structural drawing of the basic typeof Model BGA
Table 8: List of components of the basic type of Model BGA
031
030
029
024
022
018
017
016
015
014
013
012
011
010
007
006
005
004
003
002
001
Part
numberStem cover
Plug
HandleO-ringPlugSingle-direction
thrust ball bearing
Single row deep
groove ball bearing
Single row deep
groove ball bearing
O-ringBearing collar
KeyKey
Stem nut
Lock nut
Shaft
Cap
Straight bevel gear
(B)
Straight bevel gear
(A)
Drive sleeve
Cover
Base
Part name

1
1
1
2
1

OptionOptionOption

2
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
Quantity

Remarks

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8.2 Structural drawing of the opening indicator of Model BGA

Cross section

Shaft

Cross section
Figure 6: Structural drawing of the opening indicator of Model BGA
20
19
18
17

Gear (D4-2)
1
Gear (B5-1)
1
Gear collar
338Flat washer
Table 9: List of componentsof the opening
indicatorof Model BGA 3
Gear C shaft
1
37
Curl bearing
1

16

Gear A shaft bushing

1

36

Gear (D4-1)

1

15
14
13
12
11
10
9

Cover (2)Clamp plate
Needle gear shaft
Acrylic plate
Gear A shaft
NeedleOpening plate

1
1
2
1
1
1
1

35
34
33
32
31
30
29

1
1
1
1
1
1
1

8

Stand

3

28

Gear (D3-1)
Gear (D2-1)
Gear (D2-1)
Gear (B4-1)
Gear (B3-1)
Gear (B2-1)
O-ringE-shaped
retainingring

7

Fixed collar for gear
(medium 2, 3)

2

27

Parallel pin

1

6

Cover (1)

1

26

5

Gear (A1)

1

25

4

Gear (C1)

1

24

3
2

Gear (medium 2, 3)
Gear (medium 1)
Opening indicator
body

2
1

23
22

1

21

1
Part
numberPart name

Quantity

RemarksPart
numberHexagonsocketsetscrew
Cross-recessedpanhead machine screw
Spring washer
Snap ring (for shaft)
SpacerHexagon socket headcap screwPart name

1

1
3
1
1
1
6
Quantity

Remarks

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9. Environment
Painting: Heatproof temperature of 150 degrees
Lubricant: -20 to +110
Operating temperature range: -20C to +90C
Resin-related information
Position indicator acrylic resin:
Handle grip: -65C to +135C
10. Contact after Delivery
When contacting us about Model BGA, notify us of the following items, stamped on the
nameplate:
・TYPE: Actuator model
・ORDER: Product number
・SERIAL: Serial number

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