USER INSTRUCTIONS
Limitorque ® B320 Series
FCD LMENIM3201-02 – 01/15
Installation
Operation
Maintenance
Experience In Motion
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Contents
1 Introduction 5
1.1 Purpose 5
1.2 User Safety 5
2 Product Capabilities and Features 6
2.1 Initial Inspection and Storage Instructions 6
2.2 Product Identification 7
2.3 Inspection and Recording 7
2.4 Storage Procedure 8
3 Operator Weights 9
4 Installation Instructions 10
4.1 Safety Precautions 10
4.2 Safety Practices 11
4.3 Installation 11
4.3.1 Installing an Operator with a Threaded Stem Nut 11
4.3.2 Installing an Operator with a Blank Stem Nut (B320-10 through -90, one-piece) 11
4.3.3 Installing an Operator with a Blank Stem Nut (B320-90, two-piece) 12
5 Lubrication 13
5.1 Lubrication Inspection 13
5.2 Factory Lubricant 13
5.3 Minimum Lubricant Qualities Required 14
6 Disassembly and Reassembly 15
6.1 Disassembly and Reassembly of B320-10 through -80 16
6.1.1 Disassembly 16
6.1.2 Reassembly 16
6.2 Disassembly and Reassembly of B320-90 20
6.2.1 Disassembly 20
6.2.2 Reassembly 20
6.3 Disassembly and Reassembly of Spur Gear Attachments 21
6.3.1 Disassembly of 3:1 Spur Gear Attachment for B320-10 through -40 21
6.3.2 Reassembly of 3:1 Spur Gear Attachment for B320-10 through -40 22
6.3.3 Disassembly of 6.3:1, 10.3:1, and 10.8:1
Spur Gear Attachments for B320-50, -70, and -80 23
6.3.4 Reassembly of 6.3:1, 10.3:1, and 10.8:1
Spur Gear Attachments for B320-50, -70, and -80 23
6.3.5 Disassembly of 5:1 Spur Gear Attachment for B320-90 25
6.3.6 Reassembly of 5:1 Spur Gear Attachment for B320-90 25
6.3.7 Disassembly of 17.5:1 Spur Gear Attachment for B320-90 27
6.3.8 Reassembly of 17.5:1 Spur Gear Attachment for B320-90 27
7 How to Order Parts 30
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Figures
Figure 2.1 – B320 Bevel Gear Operator 7
Figure 2.2 – B320 Nameplate 8
Figure 6.1 – B320-10 and 20 Parts Diagram 17
Figure 6.2 – B320-30 and -40 Parts Diagram 17
Figure 6.3 – B320-50 and -70 Parts Diagram 18
Figure 6.4 – B320-80 Parts Diagram 18
Figure 6.5 – B320-90 Parts Diagram 20
Figure 6.6 – 3:1 SGA Parts Diagram for B320-10 through -40 22
Figure 6.7 – 6.3:1, 10.3:1, and 10.8:1 SGA Parts Diagram for B320-50 through 80 24
Figure 6.8 – 5:1 SGA Parts Diagram for B320-90 26
Figure 6.9 – 17.5:1 SGA Parts Diagram for B320-90 28
Tables
Table 3.1 – Operator Weights 9
Table 5.1 – Lubricant Quantities 14
Table 6.1 – Quantity of Ball Bearings 15
Table 6.2– Common Parts List 19
Table 6.3 – B320-90 Parts List 21
Table 6.4 – 3:1 SGA Parts List for B320-10 through -40 23
Table 6.5 – 6.3:1 , 10.3:1, and 10.8:1 SGA Parts List for B320-50 through 80 24
Table 6.6 – 5:1 SGA Parts List for B320-90 26
Table 6.7 – 17.5:1 SGA Parts List for B320-90 29
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Introduction
1.1 Purpose
This Installation, Operation and Maintenance Manual (IOM) explains how to install and maintain the
B320 bevel gear operator. Information on installation, disassembly, lubrication, and spare parts is
provided.
1.2 User Safety
Safety notices in this manual detail precautions the user must take to reduce the risk of personal
injury and damage to the equipment. The user must read and be familiar with these instructions
before attempting installation, operation, or maintenance. Failure to observe these precautions could
result in serious bodily injury, damage to the equipment, void of the warranty, or operational difficulty.
Safety notices are presented in this manual in three forms:
c WARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning
notices could result in personal injury or death.
a CAUTION: Directs the user’s attention to general precautions that, if not followed, could result in
personal injury and/or equipment damage.
NOTE: Highlights information critical to the user’s understanding of the gear operator’s installation
and operation.
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Product Capabilities
2
and Features
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Designed to make operation of multi-turn valves easier The B320 gear operator makes it easier to both
manually operate multi-turn valves and convert to a motorized service.
Built for reliable valve control — whether manual or motorized The B320 offers torque ranges up to
8,000 ft-lb (10,856 N m) and thrust capacities to 325,000 lb (1,445 kN) for any application
demanding superior strength and accuracy.
Easily adaptable for other applications The B320 is designed to be configured to each customer’s needs:
• Optional handwheel available for manual actuation
• Add a spur gear attachment for greater mechanical advantage
• Couple with an electric actuator from Limitorque for an economical, motorized, multi-turn package
2.1 Initial Inspection and Storage Instructions
c WARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to store the gear operator.
6
2.2 Product Identification
Input Shaft Mounting Base Housing
Nameplate
Figure 2.1 – B320 Bevel Gear Operator
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
2.3 Inspection and Recording
Upon receipt of the gear operator, inspect the condition of the equipment and record nameplate
information.
1. Carefully remove gear operator from shipping carton or skid. Thoroughly examine the equipment
for any physical damage that may have occurred during shipment. If damaged, immediately
report the damage to the transport company.
2. A nameplate is attached to each gear operator with the following information:
• Operator Size
• Limitorque Order Number
• Ratio
• Serial Number
Record this information for future reference, for ordering parts or obtaining further information.
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Figure 2.2 – B320 Nameplate
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
2.4 Storage Procedure
NOTE: The following is the recommended storage procedure to retain maximum product integrity
during storage. Failure to comply with recommended procedure will void the warranty.
Storage (Less Than One Year)
Operators should be stored in a clean, dry, protected warehouse and should be stored on wooden
skids to protect the machined mounting flange. If the operators must be stored outside, they must be
covered in polyethylene protection with silica gel crystals to absorb moisture. Input shafts should be
rotated every three months to mix lubricant.
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Operator Weights
The approximate weights of the gear operators, with and without spur gear attachments, are provided
below:
Table 3.1 – Operator Weights
Operator Without SGA With SGA
lb kg lb kg
B320-10 45 21 75 34
B320-20 51 23 80 36
B320-30 57 26 86 39
B320-40 68 31 97 44
B320-50 143 65 198 90
B320-70 254 115 309 140
B320-80 418 190 474 215
B320-90 745 339 875 398
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Installation Instructions
4.1 Safety Precautions
c WARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to install, operate, or troubleshoot the Limitorque operator.
c WARNING: Potential HIGH PRESSURE vessel — be aware of high-pressure hazards associated
with the attached valve or other actuated device when installing or performing maintenance
on the operator. Do not remove the operator mounting bolts from the valve or actuated device
unless the valve or device stem is secured or there is no pressure in the line.
c WARNING: For maintenance and/or disassembly of the operator while installed on the valve,
ensure that the operator is not under thrust or torque load. If the valve must be left in service, the
valve stem must be locked in such a way as to prevent any movement of the valve stem.
c WARNING: Do not manually operate the operator with devices other than the installed hand-
wheel. Using force beyond the ratings of the operator and/or using additive force devices such as
cheater bars, wheel wrenches, pipe wrenches, or other devices on the operator handwheel may
cause serious personal injury and/or damage to the operator and valve.
c WARNING: Do not exceed any design limitations or make modifications to this equipment
without first consulting Limitorque.
c WARNING: Use of the product must be suspended any time it fails to operate properly.
a CAUTION: If a motor actuator is driving the manual operator, do not operate the valve under
motor operation without first checking and setting the limit switch setting and checking for
correct motor rotation.
a CAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as
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serious personal injury and/or damage to the operator and valve may result.
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
4.2 Safety Practices
The following check points should be performed to maintain safe operation of the B320 gear
operator:
• Set up a periodic operating schedule on infrequently used valves.
• Ensure that the limit and/or torque switches on any electric actuator fitted to the bevel gear
operator are correctly and appropriately adjusted.
4.3 Installation
The B320 series of gear operators has been designed to transmit torque as well as thrust. The gear
operator can be supplied with a threaded stem nut, keyed stem nut, or a blank stem nut.
4.3.1 Installing an Operator with a Threaded Stem Nut
1. Position operator above the valve stem.
2. Rotate the operator handwheel or wrench nut several turns until there is positive engagement
between the valve stem and the operator stem nut.
3. Rotate the handwheel to lower the operator onto the valve until contact has been made with the
valve flange.
4. Bolt the gear operator securely to the valve mounting flange.
4.3.2 Installing an Operator with a Blank Stem Nut
(B320-10 through -90, one-piece)
1. Remove the thrust ring from the base of the operator.
a CAUTION: Care must be taken to ensure that the O-ring seals located on the ring are not
damaged.
2. Remove the stem nut assembly consisting of a bronze nut and two needle roller bearings with
washers.
3. Remove bearings and washers. Place them in a clean and dry area until reassembly.
4. Machine the stem nut to suit the valve stem.
a CAUTION: Care should be taken to ensure that the clamping devices used during machining do
not damage surfaces of the stem nut.
5. Reassemble the operator, reversing steps 1, 2, and 3.
a. Install bearings and washers onto the bronze stem nut.
b. Install the assembly into the thrust base.
c. Bolt the thrust base assembly to the main housing.
a CAUTION: Ensure that no dirt or foreign material enters the operator.
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6. Using the specified lubricant, grease the thrust base assembly through the grease fitting. See
Section 5 Lubrication, and Figure 6.1, 6.2, 6.3, 6.4 and 6.5 for grease fitting location.
7. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.
4.3.3 Installing an Operator with a Blank Stem Nut
(B320-90, two-piece)
(Piece numbers refer to Figure 6.5 and Table 6.3).
1. Remove the key from the bottom of the operator. The key is located between the Thrust Drive
Sleeve (piece #117) and the Stem Nut (piece #392). The key is tapped (¼-20) to provide for
removal.
2. Remove the Stem Nut by rotating in the proper direction. The Stem Nut is threaded into the Thrust
Drive Sleeve (piece #394). A slot is provided on the end of the Stem Nut to aid in its removal.
3. Thread the Stem Nut to suit the valve stem.
a CAUTION: Do not clamp the splined area of the Stem Nut during the tapping operation.
4. Reassemble the operator, reversing steps 1 and 2. Stem Nuts should be positioned flush with the
Thrust Drive Sleeve but can be recessed inward approximately ¼ inch, if so desired. Stem Nuts
can also be positioned to extend below the Thrust Drive Sleeve approximately ¼ inch without
jeopardizing the thrust rating of the operator. All Stem Nuts are threaded on the outside diameter
using eight threads per inch.
5. Mount the operator on the valve as detailed in Section 4.3.1, Installing an Operator with a Threaded
Stem Nut.
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Lubrication
The B320 bevel gear operators have a sealed gear case, factory-lubricated with grease. No seal
can remain absolutely tight at all times. Therefore, it is not unusual to find a very small amount of
weeping around shaft seals — especially during long periods of idleness such as storage. Using
grease minimizes this condition as much as possible. If a small amount is weeping at start-up,
remove it with a clean cloth. Once the equipment is operating on a regular basis, the weeping should
stop.
5.1 Lubrication Inspection
Inspect the B320 bevel gear operators for correct lubrication prior to operating — particularly
following a storage period. We recommend the operators be checked during an overhaul program.
5.2 Factory Lubricant
The B320 series operator gear case is factory-lubricated with EP-0 lithium soap, mineral base grease,
suitable for temperatures from -20˚F (-29˚C) to 225˚F (107˚C).
a CAUTION: Do not mix lubricants of dissimilar bases.
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Table 5.1 – Lubricant Quantities
Operator Without SGA With SGA
lb kg lb kg
B320-10 0.7 0.3 1.2 0.6
B320-20 0.7 0.3 1.2 0.6
B320-30 1.2 0.6 1.7 0.8
B320-40 1.2 0.6 1.7 0.8
B320-50 2.2 1.0 2.7 1.2
B320-70 4.0 1.8 4.5 2.0
B320-80 4.0 1.8 4.5 2.0
B320-90 4.2 1.9 6.7 3.1
5.3 Minimum Lubricant Qualities Required
The standard lubricants used by Limitorque have been proven to be extremely reliable over years of
service. Lubricant substitute may be used; however, Limitorque does require the following lubricant
qualities as a minimum.
The lubricant must
• contain an “EP” additive.
• be suitable for the temperature range intended.
• be water- and heat-resistant and non-separating.
• not create more than 8% swell in Buna N or Viton.
• not contain any grit, abrasive, or fillers.
• be slump-prefer NLGI-0 grade.
• not be corrosive to steel gears, balls, or roller bearings.
• have a dropping point above 316°F (158°C) for temperature ranges of -20°F to 150°F (-28°C to
65°C).
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Disassembly and Reassembly
No special tools are required for assembly/disassembly of the B320 series bevel gear operators.
c WARNING: Valve must be in fully opened position with no pressure in the line to perform work
on the gear operator.
a CAUTION: During disassembly and reassembly, all removed components should be cleaned and
placed in an area free of dirt, water, or other foreign material.
a CAUTION: Care should be taken in removing the ball bearings located between the bevel gear and
thrust housing. These bearings are non-caged, hardened ground balls.
The table below indicates the number of ball bearings utilized by each B320 size.
Table 6.1 – Quantity of Ball Bearings
Operator Quantity
B320-10 42
B320-20 42
B320-30 57
B320-40 57
B320-50 53
B320-70 74
B320-80 80
B320-90 66
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6.1 Disassembly and Reassembly of B320-10
through -80
6.1.1 Disassembly
(Piece numbers refer to Figures 6.1, 6.2, 6.3, and 6.4).
1. Remove Thrust Ring (piece #5). Pull out Stem Nut (piece #4), Washers (piece #7) and Bearings
(piece #6).
2. Remove Endcover (piece #20).
3. Slide out Bevel Pinion Shaft/Bearing Subassembly (piece #21, 22, and 23) together with Shims
(piece #25).
4. Remove Housing (piece #1) from Base (piece #2).
5. Remove Bevel Gear (piece #3) and Ball Bearings (piece #8).
NOTE: Please note the number and position of each shim.
6.1.2 Reassembly
(Piece numbers refer to Figures 6.1, 6.2, 6.3, and 6.4).
1. Install Ball Bearings (piece #8) and Bevel Gear (piece #3) on Base (piece #2).
2. Attach Housing (piece #1) to Base (piece #2).
3. Slide in Bevel Pinion Shaft/Bearing Subassembly (piece #21, 22, and 23) together with Shims
(piece #25).
4. Attach Endcover (piece #20).
5. Insert Thrust Washer (piece #7), Needle Bearing (piece #6) and another Thrust Washer (piece #7).
6. Insert Stem Nut (piece #4)
7. Insert Thrust Washer (piece #7), Needle Bearing (piece #6) and another Thrust Washer (piece #7).
8. Attach Thrust Ring (piece #5).
NOTE: Gasket compound is to be used on all metal/metal faces.
16
Figure 6.1 – B320-10 and -20 Parts Diagram
2
25
17
18
1
11
21
18
17
22
23
20
26
25229 24
27
28
8
19
12
13
14
15 16
59
6
7
10
4
3
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
1
11
3
8
12
13
61
10
Figure 6.2 – B320-30 and -40 Parts Diagram
6
7
27
28
19
14
15
16
4
5
9
29
22
20
23
24
21
26
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Figure 6.3 – B320-50 and -70 Parts Diagram
1
11
3
8
17
13
2106 7495 16 15
14
19
18
25
20
24
28
27
21
26
29
49
27
53
23 22
43
52
23A
11
1
3
8
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
18
17
23
29
25
24
20
27
28
21
26
53
54
13
2
61
10
6
7
Figure 6.4 – B320-80 Parts Diagram
19
14
9
4
5
16
15
22
22A
52
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Table 6.2– Common Parts List
Piece Quantity Description
1 1 Housing
2 1 Base
3 1 Bevel Gear
4 1 Stem Nut
5 1 Thrust Ring
6 2 Needle Bearing
7 4 Thrust Washer
8 A/R Ball Bearings
9 1 O-ring
10 1 O-ring
11 1 O-ring
12 A/R Lockwasher
13 A/R Hex Head Cap Screw
14 1 Grease Fitting
15 1 Plain Washer
16 1 Flat Head Mach. Screw
17 1 Nameplate
18 2 Drive Screw
19 1 Grease Fitting Cap
20 1 Endcover
21 1 Bevel Pinion
22 (B320-20) 2 Spacer
23 (B320-20) 2 Ball Bearing
22 (B320-40) 2 Spacer
23 (B320-40) 3 Ball Bearing
22 (B320-50) 2 Spacer
23 (B320-50) 2 Ball Bearing
22 (B320-70) 1 Spacer
22A (B320-70) 1 Spacer
23 (B320-70) 2 Spacer
22 (B320-80) 1 Spacer
23 (B320-80) 2 Ball Bearing
23A (B320-80) 1 Ball Bearing
24 1 O-ring
25 A/R Shim
26 1 Key
27 4 Lockwasher
28 4 Hex Head Cap Screw
29 1 Circlip
43 (B320-80) 1 Washer
52 1 Motorized Adapter
53 1 Lockwasher
54 1 Hex Head Cap Screw
56 (B320-50) 1 Spacer Ring (not shown)
61 (B320-20, -40, -50, -70) 1 O-ring
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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Note: A/R–as required
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6.2 Disassembly and Reassembly of B320-90
6.2.1 Disassembly
(Piece numbers refer to Figure 6.5).
1. Remove Thrust Plate (piece #118) followed by Stem Nut (piece #392, two-piece) and Drive Sleeve
(piece #117, 2-piece; piece #394, one-piece) and Roller Bearings (piece #115 and 116).
2. Remove Bevel Cap (piece #94) and withdraw Bevel Pinion/Bearing Subassembly (piece
#95, #103 and #104).
3. Remove Bevel Housing (piece #91) from Thrust Housing (piece #114).
4. Remove Bevel Gear/Torque Drive Sleeve subassembly (piece #93 and 96) and Ball Bearings (piece
#102).
6.2.2 Reassembly
(Piece numbers refer to Figure 6.5).
1. Install Ball Bearings (piece #102) and Bevel Gear/Torque Drive Sleeve subassembly (piece #93 and 96).
2. Attach Bevel Housing (piece #91) to Thrust Base (piece #114).
3. Attach Bevel Cap (piece #94) and Bevel Pinion/Bearing Subassembly (piece
#95, #103 and #104).
4. Install Roller Bearings (piece #115 and 116) and Stem Nut (piece #392, two-piece) and Drive
Sleeve (piece #117, two-piece; piece #394, one-piece), followed by Thrust Plate (piece #118).
Figure 6.5 – B320-90 Parts Diagram
105
124
94
107
108
97
95
99
100
96
93
336
115
116
106
114
113
111
121
347
110
109
105
104
103
102
91
122
20
395
119
117 393 392 394
Tw o-Piece Stem Nut Design
118
120
One-Piece Stem Nut Design
Table 6.3 – B320-90 Parts List
Piece Quantity Description
91 1 Bevel Housing
93 1 Torque Drive Sleeve
94 1 Bevel Cap
95 1 Input Shaft/Pinion
96 1 Bevel Gear
97 1 Threaded Collar
99 1 Quad Ring
100 1 O-ring
102 66 Ball Bearing
103 2 Roller Bearing Cone
104 2 Roller Bearing Cup
105 2 Spacer-Pinion
106 1 Spacer-Input Bearing
107 6 Hex Head Cap Screw
108 6 Lockwasher
109 12 Soc Head Cap Screw
110 12 Lockwasher
111 6 Hex Head Cap Screw
113 6 Lockwasher
114 1 Thrust Housing
115 2 Roller Bearing Cone
116 2 Roller Bearing Cup
117 1 Thrust Drive Sleeve (2-pc)
118 1 Thrust Plate
119 8 Hex Head Cap Screw
120 1 Quad Ring
121 1 Bushing
122 1 Quad Ring
336 1 Grease Fitting
347 1 Pipe Plug
392 1 Stem Nut
393 1 Key
394 1 Thrust Drive Sleeve (1-pc)
395 1 Lockwasher
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6.3 Disassembly and Reassembly of Spur Gear
Attachments
6.3.1 Disassembly of 3:1 Spur Gear Attachment for B320-10
through -40
(Piece numbers refer to Figure 6.6 and Table 6.4).
1. Remove Hex Head Cap Screws(piece #34) and Lockwashers (piece #35).
2. Remove the Spur Gear Cover (piece #31) and O-ring (piece #46), followed by the Input Shaft and
Pinion (piece #37), Idler Gear (piece #38), and Output Gear (piece #40).
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
38
37
39
32
30
33
40
29
36
26A
31
34
35
37
46
28
27
3. Remove the Snap Ring (piece #29).
4. Remove the Hex Head Cap Screw (piece #28) and Lockwasher (piece #27).
5. Remove the Spur Gear Housing (piece #30).
6. Continue disassembly as detailed in Section 6.1. Disassembly and Reassembly – 320-10 through -80.
6.3.2 Reassembly of 3:1 Spur Gear Attachment for B320-10
through -40
(Piece numbers refer to Figure 6.6 and Table 6.4).
1. Install the Spur Gear Housing (piece #30), using the Hex Head Cap Screw (piece #28) and
Lockwashers (piece #27).
2. Install the Snap Ring (piece #29).
3. Install the Output Gear (piece #40), Idler Gear (piece #38), and Input Shaft and Pinion (piece #37).
4. Install the O-ring (piece #46) and Spur Gear (piece #31), using the Hex Head Cap Screws (piece #34)
and Lockwashers (piece #35)
Figure 6.6 – 3:1 SGA Parts Diagram for B320-10 through -40
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Table 6.4 – 3:1 SGA Parts List for B320-10 through -40
Piece Quantity Description
26A 1 Key
27 4 Lockwasher
28 4 Hex Head Cap Screw
29 1 Snap Ring
30 1 Spur Gear Housing
31 1 Spur Gear Cover
32 5 Bushing
33 2 Dowel Pin
34 4 Hex Head Cap Screw
35 4 Lockwasher
36 2 Expansion Plug
37 1 Input Shaft and Pinion
38 1 Idler Gear
39 1 Key
40 1 Output Gear
46 1 O-ring
6.3.3 Disassembly of 6.3:1, 10.3:1, and 10.8:1 Spur Gear
Attachments for B320-50, -70, and -80
(Piece numbers refer to Figure 6.7 and Table 6.5).
1. Remove the Hex Head Cap Screws (piece #47) and Lockwashers (piece #35).
2. Remove the End Cover (piece #44) and O-ring (piece #46), followed by the Input Shaft and Pinion
(piece #37) and outer Ball Bearing (piece #45).
3. Remove the Hex Head Cap Screw (piece #34) and Lockwasher (piece #35).
4. Remove the Spur Gear Cover (piece #31), followed by the Idler Shaft subassembly (piece #48),
inner Ball Bearing (piece #45), and Final Gear (piece #40).
5. Remove the Socket Head Cap Screws (piece #53) and Lockwashers (piece #54).
6. Remove the Spur Gear Housing (piece #30).
7. Continue disassembly as detailed in Section 6.1, Disassembly and Reassembly of B320-10 through -80.
6.3.4 Reassembly of 6.3:1, 10.3:1, and 10.8:1 Spur Gear
Attachments for B320-50, -70, and -80
(Piece numbers refer to Figure 6.7 and Table 6.5).
1. Install the Spur Gear Housing (piece #30), using the Socket Head Cap Screws (piece #53) and
Lockwashers (piece #54).
2. Install the Final Gear (piece #40), inner Ball Bearings (piece #45), Idler Shaft subassembly (piece
#48), and the Spur Gear Cover (piece #31).
3. Install the Spur Gear Cover (piece #31), using the Hex Head Cap Screws (piece #34) and
Lockwashers (piece #35).
4. Install the outer Ball Bearing (piece #45) and Input Shaft and Pinion (piece #37).
5. Install the O-ring (piece #46) and End Cover (piece #44), using the Hex Head Cap Screws (piece
#47) and Lockwashers (piece #35).
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
48
40
30
31
34
35
32
36
44
47
35
37
21A
26A
45
46
51
39
32A
Figure 6.7 – 6.3:1, 10.3:1, and 10.8:1 SGA Parts Diagram for B320-50 through -80
24
Table 6.5 – 6.3:1 , 10.3:1, and 10.8:1 SGA Parts List for B320-50 through -80
Piece Quantity Description
21A 1 Spur Pinion
26A 2 Key
30 1 Spur Gear Housing
31 1 Spur Gear Cover
32 1 Bushing
32A 1 Bushing
33 2 Dowel Pin (not shown)
34 8 Hex Head Cap Screw
35 12 Lockwasher
36 2 Plug
37 1 Input Shaft & Pinion
39 1 Key
40 1 Final Gear
44 1 Endcover
45 2 Ball Bearing
46 1 O-ring
47 4 Hex Head Cap Screw
48 1 Idler Shaft Subassembly
51 1 Motorized Adapter (if required)
53 8 Socket Head Cap Screw (internal, not shown)
54 8 Lockwasher (Hi Collar) (internal, not shown)
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6.3.5 Disassembly of 5:1 Spur Gear Attachment for B320-90
(Piece numbers refer to Figure 6.8 and Table 6.6).
1. Remove the Socket Head Cap Screws (piece #217) and Lockwashers (piece #216) to remove the
Housing (piece #201).
2. Remove the Housing complete with the Input Shaft and Pinion (piece #202) and Idler Gear (piece
#203).
3. Remove the Hex Head Cap Screw (piece #215), Lockwasher (piece #214), and Flat Washer (piece
#213).
4. Remove the Output Gear (piece #204).
5. Remove the Hex Head Cap Screw (piece #218) and Lockwasher (piece #216).
6. Remove the Adapter Plate (piece #200) and O-ring (piece #211).
7. Continue disassembly as detailed in Section 6.1, Disassembly and Reassembly of B320-90.
6.3.6 Reassembly of 5:1 Spur Gear Attachment for B320-90
(Piece numbers refer to Figure 6.8 and Table 6.6).
1. Install the O-ring (piece #211) and Adapter Plate (piece #200), using the Hex Head Cap Screws
(piece #218) and Lockwashers (piece #216).
2. Install the Output Gear (piece #204).
3. Install the Flat Washer (piece #213), Lockwasher (piece #214), and Hex Head Cap Screw (piece
#215).
4. Install the Idler Gear (piece #203) and the Input Shaft and Pinion (piece #202) into the Housing
(piece #201).
5. Apply liquid gasket to the Adapter Plate flange and install the Housing assembly (piece #210, #202,
and #203), using the Socket Head Cap Screws (piece #217) and Lockwashers (piece #216).
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
202
210
206
201
212
216
217
200
206
208
218
216
213
214
215
209
204
211
205
219
Section "A-A"
208
206
203
206
Section "B-B"
Thru Idler Gear
Figure 6.8 – 5:1 SGA Parts Diagram for B320-90
26
Table 6.6 – 5:1 SGA Parts List for B320-90
Piece Quantity Description
200 1 Adapter Plate
201 1 Housing
202 1 Input Shaft and Pinion
203 1 Idler Gear
204 1 Output Gear
205 1 Spacer
206 4 Teflon Bearing
208 2 Expansion Plug
209 1 Expansion Plug
210 1 Quad Ring
211 1 O-ring
212 1 Gasket
213 1 Flat Washer
214 1 Lockwasher
215 1 Hex Head Cap Screw
216 13 Lockwasher
217 7 Socket Head Cap Screw
218 6 Hex Head Cap Screw
219 2 Dowel Pin
347 1 Pipe Plug (not shown)
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
6.3.7 Disassembly of 17.5:1 Spur Gear Attachment for B320-90
(Piece numbers refer to Figure 6.9 and Table 6.7).
1. Remove Socket Head Cap Screws (piece #220) and Lockwashers (piece #221) to remove the
Housing Cover (piece #201). The Input Shaft and Pinion (piece #202, 207, 208 ad 211) are
removed with the Housing Cover (piece #201).
NOTE: If the Input Shaft is horizontal, exercise caution when removing the Housing Cover.
Prepare to support the 2nd Set Input Shaft Assembly (piece# 204, #205, and #206)
2. Remove the 1st Set Output Gear (piece #203), the 2nd Set Input Shaft (piece #204), and the 2nd
Set Input Gear (piece #205).
3. Remove the Socket Head Screw (piece #218), Lockwasher (piece #217), and the Flat Washer
(piece #216).
4. Remove the 2nd Set Output Gear (piece #206).
5. Remove the Hex Head Cap Screw (piece #222) and Lockwashers (piece #223), and remove the
Housing (piece #200) and O-ring (piece #212).
6. Continue disassembly as detailed in Section 6.2, Disassembly & Reassembly – B320-90.
6.3.8 Reassembly of 17.5:1 Spur Gear Attachment for B320-90
(Piece numbers refer to Figure 6.9 and Table 6.7).
1. Install O-ring (piece #212) and Housing (piece #200) using the Hex Head Cap Screws (piece
#222) and Lockwashers (piece #223).
2. Install the 2nd Set Output Gear (piece #206).
3. Install the Flat Washer (piece #216), Lockwasher (piece #217), and Socket Head Cap Screws
(piece #218).
4. Install the 2nd Set Input Gear (piece #205), 2nd Set Input Shaft (piece #204), and 1st Set Output
Gear (piece #203).
5. Apply liquid gasket to the flange surface of the Housing (piece #200), and install the Housing
Cover (piece #201) using Lockwashers (piece #221) and Socket Head Cap Screws (piece #220).
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
Figure 6.9 – 17.5:1 SGA Parts Diagram for B320-90
212
200
223
222
206
220
221 201
216
217
218
215
28
214
204
209
210
205
213
209
219
203
202
210
207
209
214
208
211
Table 6.7 – 17.5:1 SGA Parts List for B320-90
Piece Quantity Description
200 1 Housing
201 1 Housing Cover
202 1 1st Set Input Shaft/Pinion
203 1 1st Set Output Gear
204 1 2nd Set Input Shaft
205 1 2nd Set Input Gear
206 1 2nd Set Output Gear
207 1 Spacer
208 1 Bushing
209 3 Bushing
210 2 Thrust Washer
211 1 Quad Ring
212 1 O-ring
213 1 Gasket
214 2 Expansion Plug
215 1 Expansion Plug
216 1 Flatwasher
217 1 Lockwasher
218 1 Socket Head Cap Screw
219 2 Dowel Pin
220 8 Socket Head Cap Screw
221 8 Lockwasher
222 6 Hex Head Cap Screw
223 6 Lockwasher
347 1 Pipe Plug (not shown)
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
29
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7
Limitorque B320 Series FCD LMENIM3201-02 – 01/15
How to Order Parts
To order parts or obtain further information for your Limitorque B320 gear operators, contact your
local Limitorque distributor sales office, or:
Flowserve Flow Control
Limitorque Actuation Systems
5114 Woodall Road
P.O. Box 11318
Lynchburg, VA 24506-1318
Telephone 434 528 4400
Fax 434 845 9736
www.flowserve.com/valves
All inquiries or orders must be accompanied by the following information:
1. Actuator Size
2. Limitorque Order Number
3. Limitorque Serial Number
30
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Limitorque B320 Series FCD LMENIM3201-02 – 01/15
31
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FCD LMENIM3201-02-AQ Printed in USA. January 2015
Flowserve Corporation
Flow Control
United States
Flowserve Limitorque
5114 Woodall Road
P.O. Box 11318
Lynchburg, VA 24506-1318
Phone: 434-528-4400
Fax: 434-845-9736
England
Flowserve Limitorque
Euro House
Abex Road
Newbury
Berkshire, RG14 5EY
United Kingdom
Phone: 44-1-635-46999
Fax: 44-1-635-36034
Singapore
Limitorque Asia, Pte., Ltd.
12, Tuas Avenue 20
Singapore 638824
Phone: 65-6868-4628
Fax: 65-6862-4940
To find your local Flowserve representative,
visit www.flowserve.com or call USA 1 800 225 6989
Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended
function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide
variety of industrial service conditions. Although Flowserve can (and often does) provide general guidelines, it cannot provide specific data and warnings for all possible applications. The
purchaser/user must therefore assume the ultimate responsibility for the proper sizing and selection, installation, operation, and maintenance of Flowserve products. The purchaser/user
should read and understand the Installation Operation Maintenance (IOM) instructions included with the product, and train its employees and contractors in the safe use of Flowserve
products in connection with the specific application.
While the information and specifications contained in this literature are believed to be accurate, they are supplied for informative purposes only and should not be considered certified or as
a guarantee of satisfactory results by reliance thereon. Nothing contained herein is to be construed as a warranty or guarantee, express or implied, regarding any matter with respect to this
product. Because Flowserve is continually improving and upgrading its product design, the specifications, dimensions and information contained herein are subject to change without notice.
Should any question arise concerning these provisions, the purchaser/user should contact Flowserve Corporation at any one of its worldwide operations or offices.
© 2015 Flowserve Corporation, Irving, Texas, USA. Flowserve is a registered trademark of Flowserve Corporation.
China
Limitorque Beijing, Pte., Ltd.
RM A1/A2
22/F, East Area, Hanwei Plaza
No. 7 Guanghua Road, Chaoyang
District
Beijing 100004, Peoples Republic
of China
Phone: 86-10-5921-0606
Fax: 86-10-6561-2702
India
Flowserve Limitorque
Plot No. #4, 1 A, Road No. 8, EPIP
Whitefield, Bangalore – 560066
Karnataka
India
Phone: 91-80-40146200
Fax: 91-80-28410286
Italy
Flowserve Limitorque
Fluid Power Systems
Via Rio Vallone 17
20883 Mezzago MB
Italy
Phone: 39-039-620601
Fax: 39-039-62060 213
flowserve.com
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