Flowserve Limitorque B320 series User manual

Experience In Motion
USER INSTRUCTIONS
Installation
Operation
Maintenance
Limitorque
®B320 Series
FCD LMENIM3201-02 – 01/15

Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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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

Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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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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1 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:
cWARNING: Refers to personal safety. Alerts the user to potential danger. Failure to follow warning
notices could result in personal injury or death.
aCAUTION: 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.

Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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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
cWARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to store the gear operator.
2 Product Capabilities
and Features

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2.2 Product Identification
Figure 2.1 – B320 Bevel Gear Operator
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.
Input Shaft Mounting Base Housing
Nameplate

Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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Figure 2.2 – B320 Nameplate
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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3 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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4 Installation Instructions
4.1 Safety Precautions
cWARNING: Read this Installation, Operation and Maintenance Manual carefully and completely
before attempting to install, operate, or troubleshoot the Limitorque operator.
cWARNING: 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.
cWARNING: 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.
cWARNING: 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.
cWARNING: Do not exceed any design limitations or make modifications to this equipment
without first consulting Limitorque.
cWARNING: Use of the product must be suspended any time it fails to operate properly.
aCAUTION: 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.
aCAUTION: Do not use replacement parts that are not genuine Flowserve Limitorque parts, as
serious personal injury and/or damage to the operator and valve may result.

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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.
aCAUTION: 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.
aCAUTION: 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.
aCAUTION: Ensure that no dirt or foreign material enters the operator.

Limitorque B320 Series FCD LMENIM3201-02 – 01/15
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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.
aCAUTION: 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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5 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).
aCAUTION: Do not mix lubricants of dissimilar bases.

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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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6 Disassembly and Reassembly
No special tools are required for assembly/disassembly of the B320 series bevel gear operators.
cWARNING: Valve must be in fully opened position with no pressure in the line to perform work
on the gear operator.
aCAUTION: During disassembly and reassembly, all removed components should be cleaned and
placed in an area free of dirt, water, or other foreign material.
aCAUTION: 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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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.

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Figure 6.1 – B320-10 and -20 Parts Diagram
Figure 6.2 – B320-30 and -40 Parts Diagram
11
1
2
12
13
8
10 769516 15
19
14
29 22 23
20
26
21
28
27 24
25
17
18
4
3
61
1
11
21 18 17 22 23 20 26
25
2
29 24
27
28
8
19
12
13
14
15 16 59 6710
4
3
61

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Figure 6.3 – B320-50 and -70 Parts Diagram
Figure 6.4 – B320-80 Parts Diagram
11
1
3
8
13
2
10 6749516 15
14
19
22 22A
18 17 23 29 25 24 20
27 28
21
26
53
54
52
12
61
1
11
3
8
17
12
13
2106 7495 16 15
14
19
18 25 20 24 28
27
21
26
29
49
27
53
23 22 43 52
23A

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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
8A/R Ball Bearings
9 1 O-ring
10 1O-ring
11 1O-ring
12 A/R Lockwasher
13 A/R Hex Head Cap Screw
14 1Grease Fitting
15 1Plain Washer
16 1Flat Head Mach. Screw
17 1Nameplate
18 2Drive Screw
19 1Grease Fitting Cap
20 1Endcover
21 1Bevel Pinion
22 (B320-20) 2Spacer
23 (B320-20) 2Ball Bearing
22 (B320-40) 2Spacer
23 (B320-40) 3Ball Bearing
22 (B320-50) 2Spacer
23 (B320-50) 2Ball Bearing
22 (B320-70) 1Spacer
22A (B320-70) 1Spacer
23 (B320-70) 2Spacer
22 (B320-80) 1Spacer
23 (B320-80) 2Ball Bearing
23A (B320-80) 1Ball Bearing
24 1O-ring
25 A/R Shim
26 1Key
27 4Lockwasher
28 4Hex Head Cap Screw
29 1Circlip
43 (B320-80) 1Washer
52 1Motorized Adapter
53 1 Lockwasher
54 1 Hex Head Cap Screw
56 (B320-50) 1Spacer Ring (not shown)
61 (B320-20, -40, -50, -70) 1O-ring
Note: A/R–as required

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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
113
111
395
119
117 393 392 394 120 118
114
106
100
96
93
102 336
115
116
99
95
97
108
107
94
105
121
109
124
104
122
347
105
103
110
91
Tw o-Piece Stem Nut DesignOne-Piece Stem Nut Design