Bray 752 Series User manual

SERIES 752
BIDIRECTIONAL PERIMETER SEAT
KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
BRAY.COM THE HIGH PERFORMANCE COMPANY

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
2 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
0.0 Definition of Terms 3
1.0 Introduction 4
2.0 Parts Identification 5
3.0 Valve Identification 6
4.0 Hazard-Free Use 7
5.0 Qualified Personnel 8
6.0 Handling Requirements 9
7.0 Lifting 10
8.0 Storage 12
9.0 Installation & Commissioning 14
10.0 Actuation and Travel Stop Setting 17
11.0 Lockout 18
12.0 Standard Maintenance
13.0 Packing Replacement - Manual Operated Valves
14.0 Packing Replacement - Cylinder Operated Valves
15.0 Seat Replacement
16.0 Troubleshooting Guide
17.0 Return Merchandise Authorization
TABLE OF CONTENTS

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
3 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
0.0 DEFINITION OF TERMS
All information within this manual is relevant to the safe operation
and proper care of your Bray valve. Please understand the
following examples of information used throughout this manual.
0.0 IDENTIFIES CHAPTER HEADING
0.00 Indentifies and explains sequential procedure to be performed.
NOTE: Provides important information related to a procedure.
SAFETY STATEMENTS: To prevent unwanted consequences.
CAUTION
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
NOTICE
Used without the safety alert symbol, indicates a potential
situation which, if not avoided, may result in an undesirable
result or state, including property damage.
WARNING
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
READ AND FOLLOW THESE INSTRUCTIONS CAREFULLY.
SAVE THIS MANUAL FOR FUTURE USE.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
4 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
1.0 INTRODUCTION
1.1 The Bray Series 752 features a robust steel reinforced perimeter
seat which provides bidirectional zero leakage shuto.
The replaceable steel reinforced perimeter seat is mechanically
retained between both halves of the two-piece bolted body
providing unsurpassed performance in the most demanding
applications.
1.2 Additional product information (such as application data,
engineering specifications, actuator selection, etc.) is available
from your local Bray distributor or sales representative, or online
at BRAY.COM
1.3 For complete details on the latest product certifications,
visit BRAY.COM/Certifications.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
5 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
Figure 1: Series 752 Parts
Item Description
1Body
2Seal
3Fasteners (Body)
4Gate
5Packing
6Gland
7Fasteners (Gland)
8Yoke
9Stem
10 Clevis
2.0 PARTS IDENTIFICATION
11 Fasteners (Clevis)
12 Collar
13 Yoke Sleeve
14 Hand Wheel

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
6 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
3.0 VALVE IDENTIFICATION
3.1 All valves, actuators, or control products are provided with an
identification tag that is unique to each device. The following
table is a representation of information that may be included.
Data Label Description
Serial Number SERIAL NUMBER Unique serial number of valve
Valve Size SIZE Valve size eg  in mm
Model MODEL Series number of the Valve
Flange Drill FLG DRILL Flange Drill eg ASME B
CL
Temperature Limits MAX TEMP Maximum temperature in
FC
Maximum Permissible
Pressure CWP Maximum permissible pressure
in psibar(g)
Body Material BODY Material grade of body eg
CF () etc
Gate Material GATE Material grade of gate eg 
Stainless Steel
Packing Material PACKING Material of packing eg PTFE
wEPDM Quad Seal
Seat Material SEAT Material of seat eg Buna-N

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
7 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
4.0 HAZARD-FREE USE
NOTICE
Failure to follow these procedures could aect product warranty.
4.1 This device left the factory in proper condition to be safely
installed and operated in a hazard-free manner. The notes and
warnings in this document must be observed by the user if this
safe condition is to be maintained and hazard-free operation of
the device assured.
4.2 Take all necessary precautions to prevent damage to the valve
due to rough handling, impact, or improper storage. Do not use
abrasive compounds to clean the valve, or scrape metal surfaces
with any objects.
4.3 The control systems in which the valve is installed must have
proper safeguards — to prevent injury to personnel, or damage to
equipment — should failure of system components occur.
4.4 The upper limits of permitted pressure and temperature
(depending on the housing and liner materials) must be
observed. These limits are shown on the valve identification tag.
4.5 The valve must not be operated until the following documents
have been observed:
> Declaration on EU Directives
> IOM Manual (supplied with the product).

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
8 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
5.0 QUALIFIED PERSONNEL
NOTICE
Failure to follow these procedures could aect product warranty.
5.1 A qualified person (in terms of this document) is one who is
familiar with the installation, commissioning, and operation of the
device, and who has appropriate qualifications, such as:
> Is trained in the operation and maintenance of electrical
equipment and systems in accordance with established safety
practices.
> Is trained or authorized to energize, de-energize, ground, tag,
and lock electrical circuits and equipment in accordance with
established safety practices.
> Is trained in the proper use and care of personal protective
equipment (PPE) in accordance with established safety
practices.
> Is trained in the commissioning, operation, and maintenance of
equipment in hazardous locations — in cases where the device
is installed in a potentially explosive (hazardous) location.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
9 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
6.0 HANDLING REQUIREMENTS
6.1 Packed Valves
Crates: Lifting and handling of the packed valves in crates will be
carried out by a fork lift truck, by means of the appropriate fork
hitches.
Cases: The lifting of packed valves in cases will be carried out in
the lifting points and in the center of gravity position which has
been marked. The transportation of all packed material must be
carried out safely and following the local safety regulations.
6.2 Unpacked Valves
Lifting and handling of valves should be carried out by using
appropriate means and observing the carrying limits. Handling
must be carried out on pallets, protecting all machined surfaces
to avoid any damage.
With large bore valves, rigging the load must be carried out by
using the appropriate tools to prevent the valve from falling or
moving during the lifting and handling.
CAUTION
For handling and/or lifting, the lifting equipment (fasteners,
hooks, etc.) must be sized and selected while taking into account
the product weight indicated in our packing list and/or delivery
note. Lifting and handling must be performed only by qualified
personnel.
Fasteners must be protected by plastic covers in sharp corner
areas.
Caution must be taken during handling to avoid this equipment
passing over workers, or over any other place where a possible
fall could cause injury or damage. In all cases, local safety
regulations must be respected.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
10 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
7.0 LIFTING THE VALVE
WARNING
A potential hazard exists with handling valves. Failure to handle
valves properly may cause a valve to shift, slip or fall causing
serious injury or death and/or equipment damage.
7.1 The points below are for reference purposes only, use safe and
proper lifting and support techniques. DO NOT lift valves with
any adjoining pipe or other equipment attached. Lift with
properly rated lifting equipment. Follow jurisdictional safety
requirements.
7.2 Suggested lifting points are as shown below to lift valve
assemblies that are in a horizontal orientation. Eye bolts in flange
through holes can be used to lift the valve body or, for 2” through
12” valves, a sling can be strapped around the top of the valve
body.
7.3 KNIFE GATE VALVE WITH BEVEL GEAR ACTUATOR:
For valves with bevel gear actuators, a sling or chain can be
wrapped around the bevel gear actuator body, between the
mounting plate and the input shaft housing. This would be in
conjunction with lifting from the valve body as well. See Figure 2.
Figure 2: Knife Gate Valve with Bevel Gear Actuator,
Horizontal Lifting
7.4 KNIFE GATE VALVE WITH PNEUMATIC CYLINDER ACTUATOR:
For valves with pneumatic cylinder actuators, a sling can be
wrapped around the cylinder, near the cylinder head (piston rod
end). This would be in conjunction with lifting from the valve
body. See Figure 3.
7.5 Utilize caution to not bump, dent or damage the cylinder tube.
7.6 DO NOT utilize the cylinder tie-rod ends to lift.
Figure 3: Knife Gate Valve with Pneumatic Cylinder Actuator,
Horizontal Lifting
(continued)

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
11 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
7.7 KNIFE GATE VALVE WITH HANDWHEEL ACTUATOR:
For valves with handwheel actuators, a sling or chain can be
wrapped through the rim of the handwheel. For chainwheel
actuators, a sling can be wrapped in the area between the
yoke/legs and the chainwheel/guide assembly. This would be in
conjunction with lifting from the valve body as well. See Figure 4.
Figure 4: Knife Gate Valve with Handwheel, Horizontal Lifting
7.8 Suggested lifting options are as shown below to lift valve
assemblies that are in a vertical orientation. For valves with bevel
gear actuators, wrap slings or chains around the top of each leg.
NOTE: Use caution not to put any side load on the bevel gear
input shaft or on the valves threaded stem. See Figure 5.
7.9 For valves with pneumatic cylinder actuators, wrap slings around
the top of each leg. Use caution to not bump, dent or damage the
cylinder tube and avoid any side load on the cylinder piston rod.
NOTE: DO NOT utilize the cylinder tie-rod ends to lift. See Figure 6.
7.10 For valves with handwheel or chainwheel actuators, wrap slings
or chains around the top of the each leg or yoke side.
NOTE: Use caution to not put any side load on the valves
threaded stem. See Figure 7.
Figure 7: Knife Gate Valve with
Handwheel, Vertical Lifting
Figure 6: Knife Gate Valve with
Pneumatic Cylinder Actuator,
Vertical Lifting
Figure 5: Knife Gate Valve w/Bevel
Gear Actuator, Vertical Lifting

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
12 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
8.0 STORAGE
NOTICE
The packaging is designed to protect the valve only during
shipping. If you are not installing the valve immediately after
delivery, then you must store it according to these requirements.
Failure to follow these procedures could aect product warranty.
8.1 Short-term storage is defined as storage of valves to allow for
project construction and will be installed within a relatively short
amount of time (typically one to three months). During short-term
storage, the following is required:
8.2 The preferred storage location is a clean, dry, protected
warehouse. Do not expose the valve to temperature extremes.
8.3 End protectors shall remain on the valve ends to prevent the
entrance of dirt, debris, or insects/wildlife.
8.4 Remain in the original shipping container with the original
packaging materials. This packaging method will not protect
valves that will be stored outside, uncovered, and unprotected.
8.5 Storage of valves in an open, uncovered area is permissible, but
requires provisions for inclement weather. The product must
elevated from the ground on a pallet, a shelf, or other suitable
surface, and must be covered with a secure, waterproof tarp.
8.6 Do not stack the valves on top of each other.
8.7 Manually actuated valves may be stored in the vertical or
horizontal position. For air or hydraulic actuated valves, the
preferred orientation is with the valve and cylinder in the vertical
position. Access ports should be secured to prevent unauthorized
entry and prevent contamination.
(continued)

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
13 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
8.8 Long-term storage is defined as storage of valves longer than
three months. During long-term storage, the following is required:
8.9 The storage location shall be a clean, dry, protected warehouse.
Do not expose the valve to temperature extremes.
8.10 End protectors shall remain on the valve ends to prevent the
entrance of dirt, debris, or insects/wildlife.
8.11 Product shall remain in the original shipping container with the
original packaging materials.
8.12 Do not stack the valves on top of each other.
8.13 Manually actuated valves may be stored in the vertical or
horizontal position. For air or hydraulic actuated valves, the
preferred orientation is with the valve and cylinder in the vertical
position. Access ports should be secured to prevent unauthorized
entry and prevent contamination.
Valves and equipment containing elastomers, including O-rings,
must be stored in a climate-controlled warehouse according to
SAE-ARP5316D requiring:
> The ambient relative humidity to be less than 75%.
> No exposure from direct ultraviolet or sunlight.
> Protection from ozone generating equipment or combustible
gases and vapors.
> Storage at temperatures below 100°F (38°C), away from direct
sources of heat.
> No exposure to ionizing radiation.
Storage inspection — visual inspection shall be performed on a
semi-annual basis and results recorded. Inspection, as a minimum,
shall include reviewing the following:
> Packaging.
> Flange covers.
> Dryness.
> Cleanliness.
8.14 Actuators to be stored with all cable/pneumatic entries plugged
to prevent entry of foreign material.
8.15 Leave protective caps and covers on the product.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
14 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
9.0 INSTALLATION AND COMMISSIONING
WARNING
Verify line is depressurized before installing, removing, or
repairing a valve or operator.
Do not pressurize the line without an operator on the valve.
The device generates a large mechanical force during normal
operation.
Observe all applicable safety regulations for valves installed in
potentially explosive (hazardous) locations.
9.1 The valve is bidirectional, it can be installed in either direction.
9.2 It is good practice to provide additional support for all
pneumatically, hydraulic and electric actuated valves installed in
the horizontal stem position. This includes ALL valve sizes due
to the fact that many of these installations are located in high
vibration areas. Failure to provide additional support will result in
premature valve failure.
9.3 It is recommended to provide support around areas indicated in
Figures 8 and 9with an adjustable sling.
9.4 Support from the top as shown or with suitable arrangement
from bottom (such as from an access platform) depending on
location constraints.
9.5 After the support is given, please operate the valve a few times
to check free movement and adjust the level (using the sling
adjuster or similar device) if required.
9.6 Ensure jerk free movement with the supports in place.
9.7 Align the mating pipeline flanges. Select the length of the flange
bolts as seen in Table 1 and Table 2 below. Install the valve
between flanges using fasteners & gaskets.
CAUTION
Care must be taken when installing the studs or bolts in the
tapped holes of the flange in the chest area to prevent damage,
see Figure 15.
(continued)
Figure 8: Installation support for
a Valve installed in Horizontal
orientation (Stem horizontal and
Bore horizontal)
Figure 9: Installation support for
a Valve installed in Horizontal
orientation (Stem horizontal and
Bore vertical)

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
15 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
9.8 Tighten flange bolts in a star pattern. See Figure 14.
9.9 Refer to GA Drawing/ Technical Bulletin for quantity and size of
blind tapped holes on valve chest area.
9.10 Gland packing is tightened to hold the specified pressure and
tested for no leakage before dispatch. However, this may
require some adjustment at site due to loosening in transit etc.
Figure 12: L3 Thru Stud
Figure 13: L4 Chest Stud
Figure 10: L1 Thru Bolt
Figure 11: L2 Chest Bolt
Table 1: RECOMMENDED FASTENERS - ASME B16.5 Class 150 Flanges
L1 (Figure 10) L2 (Figure 11)
Valve Size Bolt & Nut
Size Thru Bolt Length Thru Bolt Qty Chest Bolt Length Chest Bolt Qty Washer* Quantity
NPS DN NPS NPS
2 50 5/8-11 4.5 2 1.25 4 8
3 80 5/8-11 5.0 2 1.5 4 8
4 100 5/8-11 5.0 4 1.5 8 16
5 125 3/4-10 5.5 4 1.5 8 16
6 150 3/4-10 5.5 4 1.5 8 16
8 200 3/4-10 6.5 4 1.75 8 16
10 250 7/8-9 6.5 6 1.75 12 24
12 300 7/8-9 7.0 61.75 12 24
14 350 1-8 7.5 62.0 12 24
16 400 1-8 8.0 82.0 16 32
18 450 1 1/8-7 8.5 8 2.25 16 32
20 500 1 1/8-7 9.5 10 2.5 18 40
24 600 1 1/4-7 10.0 10 3.0 18 40
* Washer Type B Wide
Table 2: RECOMMENDED FASTENERS - ASME B16.5 Class 150 Flanges
L3 (Figure 12) L4 (Figure 13)
Valve Size Stud & Nut
Size Thru Stud Length Thru Stud Qty Chest Stud Length Chest Stud Qty Nut Qty Washer* Qty
NPS DN NPS NPS
2 50 5/8-11 5.5 2 2.25 4 8 8
3 80 5/8-11 6.0 2 2.5 4 8 8
4 100 5/8-11 6.0 4 2.5 8 16 16
5 125 3/4-10 6.5 4 2.5 8 16 16
6 150 3/4-10 6.5 4 2.5 8 16 16
8 200 3/4-10 7.5 42.75 8 16 16
10 250 7/8-9 7.5 62.75 12 24 24
12 300 7/8-9 8.0 63.0 12 24 24
14 350 1-8 8.5 6 3.5 12 24 24
16 400 1-8 9.0 8 3.5 16 32 32
18 450 1 1/8-7 9.5 84.0 16 32 32
20 500 1 1/8-7 11.0 10 4.5 20 40 40
24 600 1 1/4-7 11.5 10 5.0 20 40 40
* Washer Type B Wide

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
16 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
9.11 Tighten packing gland in a crisscross pattern until the packing
ring at the top is slightly compressed.
9.12 Pressurize the valve gradually and stop when packing leak is
visible or design pressure is reached.
9.13 Re-tighten packing gland bolts just enough to stop the leakage.
If maximum design pressure is not reached, continue to
pressurize the valve and repeat steps 9.11 and 9.12.
Figure 15: Bolt holes in the chest or
upper flange area are blind tapped
CAUTION
Support should be used for all valve sizes when installed in
vertical pipe. Failure to do so can result in improper valve
orientation and/or valve failure. Please consult factory for details.
CAUTION
If the gland nuts are pulled too hard, the force needed to operate
the valve will increase, the valve function will be aected and the
box packing lifetime will be shortened.
Figure 14: Bolt Tightening
Sequence
16
2 5
37
84

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
17 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
10.0 ACTUATION AND TRAVEL STOPS
WARNING
Verify line is depressurized before installing, removing, or
repairing a valve or operator.
Do not pressurize the line without an operator on the valve.
10.1 PNEUMATIC CYLINDER OPERATED VALVES
10.2 In Figure 16, connect instrument quality air, preferably through an
air filter/regulator of adequate size.
10.3 The recommended air pressure is 80-100 psi (5-7 bar). Refer to
the appropriate bulletin/drawing for port and cylinder size details.
10.4 Make sure the supply air is free from moisture, dirt, and other
foreign particles.
10.5 Drain the filter regulator before operating the actuator so that
pipe rust and dirt if any in the air line will be removed before
actuation.
10.6 If valves are supplied with electrical accessories like limit switch
and solenoid valve, ensure wiring is done as per local electrical
safety codes and regulations.
10.7 Ensure correct electrical supply is given to electrical accessories
for proper functioning and safety of the equipment.
10.8 Open the valve by energizing the solenoid valve/giving air supply
to cylinder and operate the valve 2-3 times.
10.9 MANUAL VALVES
10.10 For Figure 17, Stroke the valve through the full open and closed
position to make sure it is functioning properly.
Figure 16: Cylinder Actuator
Figure 17: Manual Valve Stem

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
18 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
11.0 LOCKOUT
11.1 Lockouts, Figure 18, are designed to prevent unauthorized
operation of the valve. The instructions below are intended for
personnel who are responsible for the installation, operation and
maintenance of the lockout device for Bray knife gate valves.
11.2 Any actuated valve (Pneumatic or Hydraulic or Electric) must
be placed in a “De-energized state” by isolating all potential
energy sources including electricity, operator supply air or
hydraulic fluids.
11.3 Valves supplied with spring to close or open contain mechanical
springs in the cylinder and hence cannot be placed in a de-
energized state. Take extreme care when inserting and removing
the lockout pin to avoid any injury to operating personnel.
11.4 For mechanical lockout or full force lockout, where the lockouts
are meant to hold the full actuator force, please contact factory
for assistance and more information.
CAUTION
Once the lockout pins are in place in the lockout brackets, any
Bray actuated valve MUST be placed in a “De-energized state”
by isolating the supply air / hydraulic fluid / electricity.
CAUTION
The lockout device could get damaged when actuator thrust is
applied with the Lockout pin engaging the Gate.
Figure 18: Lockout pin through
yoke and clevis.

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
19 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
12.0 STANDARD MAINTENANCE
WARNING
Verify line is depressurized before installing, removing, or
repairing a valve or operator.
Do not pressurize the line without an operator on the valve.
WARNING
After completing any alterations or maintenance procedures, the
product must be tested to confirm performance requirements.
WARNING
When the process fluid is hazardous, thermal (hot or cold), or
corrosive, take extra precautions.
WARNING
Always wear protective clothing and equipment to safeguard
the eyes, face, hands, skin, and lungs from the particular fluid in
the line.
NOTICE
Any modification or use of unauthorized parts voids any and all
warranty considerations.
NOTICE
Note assembly positions before removal.
CAUTION
Disconnect electrical, pneumatic, and hydraulic power before
servicing actuator or automation components.
13.1 The stem and nut of the knife gate valve are lubricated at the
factory before shipment.
13.2 The manual valve stem should be lubricated at regular intervals for
smooth operation of the valve. A lubrication nipple is provided on
the collar. See Lubrication requirements in Table 3.
13.3 Cylinder operated valves do not require routine lubrication.
(continued)
Table 3: Recommended Lubrication
Lubricant Type
Industrial Grease - Medium
C5 - A Compound
XL 47 - F2 - 75
Molytex Grease #2

SERIES 752 BIDIRECTIONAL PERIMETER SEAT KNIFE GATE VALVE
Installation, Operation, and Maintenance Manual
20 of 27© 2023 BRAY INTERNATIONAL, INC. ALL RIGHTS RESERVED. BRAY.COM The Information
contained herein shall not be copied, transferred, conveyed, or displayed in any manner that would
violate its proprietary nature without the express written permission of Bray International, Inc.
NOTICE
If the cylinder actuator is disassembled for repair, the cylinder
wall and seals need to be lubricated with a lithium-based grease
prior to reassembly.
13.4 Parts recommended as spares as shown in Table 4, may be
stocked. Provide the valve serial number and work order number
from the nameplate for proper parts.
Table 4: Recommended Spare Parts
Part Qty
Gland Packing Set of 3 Rows
Spare U-Seal 1
Cylinder Repair Kit 1
Gate 1