Bray 740 Series User manual

SERIES 740
BIDIRECTIONAL KNIFE GATE VALVES
Installation, Operation and Maintenance Manual
BRAY.COM THE HIGH PERFORMANCE COMPANY

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
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1.0 Definition of Terms 3
2.0 Hazard Free Use 3
3.0 Introduction 4
4.0 Parts Identification 5
5.0 Valve Identification 6
6.0 Lifting The Valve 7
7.0 Storage 8
8.0 Installation 9
9.0 Replacement of the Chest Liner 12
10.0 Lockout 13
11.0 Maintenance 13
12.0 Packing Replacement | Manual Valves 14
13.0 Packing Replacement | Cylinder Operated Valves 15
14.0 Seal Replacement 17
15.0 Troubleshooting 18
16.0 Return Merchandise Authorization 19
TABLE OF CONTENTS

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
0.00 Identifies and explains sequential procedure to be performed.
NOTE: Provides important information related to a procedure.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may
result in 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 injury.
1.0 DEFINITION OF TERMS
READ AND FOLLOW THESE INSTRUCTIONS CAREFULLY.
SAVE THIS MANUAL FOR LATER USE.
2.0 HAZARD-FREE USE
2.1 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.
2.2 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
2.3 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.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
2.4 QUALIFIED PERSONNEL
2.4.1 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:
2.4.1.1 Is trained in the operation and maintenance of electrical equipment
and systems in accordance with established safety practices.
2.4.1.2 Is trained or authorized to energize, de-energize, ground, tag, and
lock electrical circuits and equipment in accordance with established
safety practices.
2.4.1.3 Is trained in the proper use and care of personal protective
equipment (PPE) in accordance with established safety practices.
2.4.1.4 Is trained in first aid.
2.4.1.5 In cases where the device is installed in a potentially explosive
(hazardous) location – is trained in the commissioning, operation,
and maintenance of equipment in hazardous locations.
2.5 Additional information about Series 940 Unidirectional Knife Gate
Valve — including application data, engineering specifications, and
actuator selection — is available from your local Bray distributor or
sales representative.
3.0 INTRODUCTION
3.1 The Bray Knife Gate Series 940’s one-piece, cast body
design offers rugged performance in applications ranging
from general purpose to severe media handling. Available
with integral metal or replaceable soft seat, the Bray Knife
Gate Series 940 gate valve is easily automated for on/off
applications.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
Item Description
1 Body
2Gate
3 Seat
4 Chest Liner
5 Packing Set
6 Gland
7 Gland Bolt
8 Gland Washer
9 Gland Nut
10 Yoke
11 Mounting Bolt (Top)
12 Mounting Nut (Top)
13 Mounting Bolt (Bottom)
4.0 PARTS IDENTIFICATION
Figure 1: Series 740 Exploded View
Item Description
14 Spring Washer
15 Clevis
16 Stem
17 Clevis Bolt
18 Clevis Nut
19 Collar
20 Yoke Sleeve
21 Grease Nipple
22 Needle Bearing
23 Hand Wheel
24 Soc Screw
25 Anti Extrusion Ring*
25
9
12
19 5
15
8
6
4
3
7
1
24
23
22
21
20
11
16
10
13
17
14
2
18
Note: In Figure 1, Item 25 is
available in valves 14" or larger.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
5.0 VALVE IDENTIFICATION
5.1 Valve size and brief material specification of body (markings such
as “SS” or “DI”) are marked on the valve body.
5.2 A stainless steel nameplate (below) affixed to the yoke of the
valve contains most of the relevant information on the valve that
includes a unique serial number of the valve.
NOTE: Please reference the valves serial number when inquiring
for spare parts.
5.3 All Series 740 Knife Gate valves are provided with an identification
tag (Figure 2) printed with the following data:
>SERIAL NUMBER: Unique serial number of valve.
>SIZE: Valve size e.g. 6 in/150 mm.
>MODEL: Series number of the valve.
>FLG. DRILL: Flange Drill e.g. ASME B16.5 CL150.
>BODY: Material grade of body e.g. CF8 (304) etc.
>GATE: Material grade of gate e.g. 304 Stainless Steel.
>SEAT: Material of seat e.g. Buna-N.
>PACKING: Material of packing e.g. PTFE w/EPDM Quad Seal.
>CWP: Maximum permissible pressure in psi/bar(g)
>MAX TEMP: Maximum temperature in °F/°C
SERIAL NUMBER
SEAT PACKING CWP MAX TEMP
MODEL FLG. DRILL BODY GATE
SIZE
Figure 2: Identification tag.
NOTICE
Ensure the box is not damaged externally. Remove the valve from the
packaging and check for any damage to the valve and its components
during transit. Report any damage or discrepancies immediately.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
6.1 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.
6.2 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.
6.3 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 3.
Figure 3: Knife Gate Valve with Bevel Gear Actuator,
Horizontal Lifting
6.4 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 4.
6.4.1 Utilize caution to not bump, dent or damage the cylinder tube.
6.4.2 DO NOT utilize the cylinder tie-rod ends to lift.
Figure 4: Knife Gate Valve with Pneumatic Cylinder Actuator,
Horizontal Lifting
6.0 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.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
6.5 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 5.
Figure 5: Knife Gate Valve with Handwheel, Horizontal Lifting
6.6 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 6.
6.7 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 7.
6.8 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 8.
Figure 8: Knife Gate Valve with
Handwheel, Vertical Lifting
Figure 7: Knife Gate Valve with
Pneumatic Cylinder Actuator,
Vertical Lifting
Figure 6: Knife Gate Valve with
Bevel Gear Actuator, Vertical Lifting
7.0 STORAGE
7.1 Apply corrosion inhibitor on iron bodied valve threads. Metal to
Metal seat surfaces should be lubricated.
7.2 Store valves flat in closed position. (Do not over tighten)
7.3 Actuators to be stored with all cable/pneumatic entries plug to
prevent entry of foreign material.
7.4 Do NOT stack the valves on top of each other.
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.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
7.5 Spare seats should always be stored in accordance with the
following.
NOTE: The elastomer storage guidelines are for components that
are not already installed in a valve.
7.5.1 Store at ambient temperature up to 30°C (86°F), with 60-90%
relative humidity away from direct sunlight.
7.5.2 Store at a minimum distance of 4.6 meters (15 feet) away from
electric motors is mandatory.
7.5.3 Ensure storage is not done in a stressed condition (such as against
a sharp edge.)
8.1 The valve is Bidirectional. It should be installed with pressure
exerted against the seat. To enable correct orientation the word
“SEAT” is marked on the valve body to indicate the position of
the valve seat.
8.2 All valves larger than 12"/300mm size with pneumatic cylinder
actuators must be provided with extra support at site.
8.2.1 It is recommended to provide support around areas indicated in
Figures 9 and 10 with an adjustable sling.
Figure 9: Installation support for a Valve installed in Horizontal
orientation (Stem horizontal and Bore horizontal
8.2.2 Support from the top as shown or with suitable arrangement from
bottom (such as from an access platform) depending on location
constraints.
8.2.3 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.
WARNING
The device generates a large mechanical force during normal operation.
WARNING
Observe all applicable safety regulations for valves installed in potentially
explosive (hazardous) locations.
8.0 INSTALLATION
Figure 10: Installation support
for a Valve installed in Horizontal
orientation (Stem horizontal and
Bore vertical)

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
Figure 13: L7 Lug Stud
Figure 14: L8 Chest Stud
Table 2: STUD DETAILS - ASME B16.5 Class 150 Flanges
L7 (Figure 13) L8 (Figure 14)
Valve Size Stud & Nut
Size
Lug Stud
Length
Stud
Qty
Chest Stud
Length
Stud
Qty
Nut
Qty
Washer*
Quantity
NPS DN NPS
2 50 5/8-11 3.5 4 2.0 4 8 8
3 80 5/8-11 4.0 4 2.25 4 8 8
4 100 5/8-11 4.0 12 2.25 4 16 16
5 125 3/4-10 4.25 12 2.5 4 16 16
6 150 3/4-10 4.50 12 2.5 4 16 16
8 200 3/4-10 4.75 12 2.75 4 16 16
10 250 7/8-9 5.25 16 3.0 824 24
12 300 7/8-9 5.25 16 3.0 824 24
14 350 1-8 6.0 16 3.5 8 24 24
16 400 1-8 6.0 20 3.5 12 32 32
18 450 1 1/8-7 6.5 20 4.0 12 32 32
20 500 1 1/8-7 7.0 24 4.0 16 40 40
24 600 1 1/4-7 7.5 24 4.5 16 40 40
* Washer Type B Wide
Table 1: RECOMMENDED FASTENERS - ASME B16.5 Class 150 Flanges
L5 (Figure 11) L6 (Figure 12)
Valve Size Bolt & Nut
Size
Lug Bolt
Length
Lug Bolt
Qty
Chest Bolt
Length
Chest Bolt
Qty
Washer*
Quantity
NPS DN NPS
2 50 5/8-11 1.5 4 1.25 4 8
3 80 5/8-11 1.8 4 1.5 4 8
4 100 5/8-11 1.8 12 1.5 4 16
5 125 3/4-10 2.0 12 1.5 4 16
6 150 3/4-10 2.0 12 1.5 4 16
8 200 3/4-10 2.3 12 1.75 4 16
10 250 7/8-9 2.5 16 1.75 824
12 300 7/8-9 2.5 16 1.75 824
14 350 1-8 2.8 16 2.0 824
16 400 1-8 2.8 20 2.25 12 32
18 450 1 1/8-7 3.0 20 2.25 12 32
20 500 1 1/8-7 3.3 24 2.5 16 40
24 600 1 1/4-7 3.5 24 2.75 16 40
* Washer Type B Wide
Figure 11: L5 Lug Bolt
Figure 12: L6 Chest Bolt
8.2.4 Ensure jerk free movement with the supports in place.
8.3 Observe the following points to prevent distortion of the valve
body and gate when the flange bolts are tightened.
8.3.1 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.
8.3.2 Refer to GA Drawing/ Technical Bulletin for quantity and size of
blind tapped holes on valve chest area.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
CAUTION
If the gland nuts are pulled too hard, the force needed to operate the
valve will increase, the valve function will be affected and the box packing
lifetime will be shortened.
8.6 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.
8.6.1 Tighten packing gland in a crisscross pattern until the packing ring
at the top is slightly compressed.
8.6.2 Pressurize the valve gradually and stop when packing leak is visible
or design pressure is reached.
8.6.3 Re-tighten packing gland bolts just enough to stop the leakage.
8.6.4 If maximum design pressure is not reached, continue to pressurize
the valve and repeat steps 8.6.2 and 8.6.3.
CAUTION
Support should be used for valves size 12"and over when installed in
vertical pipe. Failure to do so can result in improper valve orientation
and/or valve failure.
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.
Figure 15: Bolt holes in the chest or
upper flange area are blind tapped
CAUTION
Incorrect electrical supply to accessories will damage the equipment. Do
not over tighten the gland nuts as this may cause excessive friction and
premature damage to packing.
8.7 CYLINDER OPERATED VALVES
8.7.1 In Figure 16, connect instrument quality air, preferably through an
air filter/regulator of adequate size.
8.7.2 The recommended air pressure is 80-100 psi (5-7 bar). Refer to the
appropriate bulletin/drawing for port and cylinder size details.
8.7.3 Make sure the supply air is free from moisture, dirt, and other
foreign particles.
8.7.4 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.
Figure 16: Cylinder Actuator
Figure 17: Manual Valve Stem

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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 of 20
8.7.5 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.
8.7.6 Ensure correct electrical supply is given to electrical accessories
for proper functioning and safety of the equipment.
8.7.7 Open the valve by energizing the solenoid valve/giving air supply
to cylinder and operate the valve 2-3 times.
8.8 MANUAL VALVES
8.8.1 For Figure 17, Stroke the valve through the full open and closed
position to make sure it is functioning properly.
9.0 REPLACEMENT OF THE CHEST LINER
9.1 Remove the entire valve (including topworks) from the pipeline.
9.2 Secure the valve in the vertical position to a fixture, workbench, or
table that is anchored to the floor.
9.3 Stroke the valve to the open position.
9.4 Remove the yoke, topworks, and packing gland from the valve:
a) Remove the yoke fasteners and gate clamp fasteners.
b) Lift off the yoke and topworks.
c) Remove gland fasteners and packing gland.
9.5 Lift out the gate, clean it, and smooth out any marred or rough
surfaces with a scotch-brite pad. The gate should be free of
grooves and scratches.
9.6 Remove the old packing and clean the packing chamber.
9.7 Remove chest liner for visual inspection. If damaged, replace, if not
clean and re-install.
9.8 Reinstall the chest liners with the chest liner edge catching on the
packing ledge in the body.
9.9 Insert the gate between the chest liners by pushing the gate as far
down as possible by hand.
NOTICE
In valves up to and including 12", Chest liner is standard in this series.
CAUTION
Do not block valve port when anchoring valve. An overhead hoist is
helpful especially on larger size valves.
Figure 18: Chest Liner close-up.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
13 of 20
9.10 Reinstall the topworks. Do not fasten the gate clamp to the gate.
9.11 Push the gate into the seat.
9.12 Retract the actuator to the open position while leaving the gate in
the closed position.
9.13 Repack the valve and follow steps 11.6 through 11.10.
10.0 LOCKOUT
10.1 Lockouts 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.
10.2 Lockout pins are optional in Bray Knife gate valves. Figure 19.
10.3 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.
10.4 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.
10.5 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 19: Lockout pin through
yoke and clevis.
11.0 MAINTENANCE
NOTICE
Any modification or use of unauthorized parts voids any and all warranty
considerations.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
14 of 20
11.1 The stem and nut of the knife gate valve are lubricated at the
factory before shipment.
11.2 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.
11.3 Cylinder operated valves do not require routine lubrication.
11.4 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.
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.
Table 3: Recommended Lubrication
Lubricant Type
Industrial Grease - Medium
C5 - A Compound
XL 47 - F2 - 75
Molytex Grease #2
Table 4: Recommended Spare Parts
Part Qty
Gland Packing Set of 3 Rows
Spare Seat 1
Cylinder Repair Kit 1
Gate 1
Chest Liner Set of 2 pc
CAUTION
Disconnect electrical, pneumatic, and hydraulic power before servicing
actuator or automation components.
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.
12.0 PACKING REPLACEMENT - Manual Valves
WARNING
Relieve line pressure before loosening gland nuts to avoid injury and/or
equipment damage. Fully close the valve. Ensure the line is empty, and
flush if necessary. Remove the valve from the pipeline.
12.1 Ensure the valve is fully closed.
12.2 In (Figure 20) disconnect the stem from the GATE (6) by
removing the CLEVIS BOLTS & NUTS (5).
12.3 Rotate the HANDWHEEL (1) counter-clockwise by holding the
stem from rotation, so that the stem retracts fully from the gate.
4
3
2
5
6
1
Figure 20: Manual Valve Cutaway

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
15 of 20
NOTICE
If valves are supplied with bellows, ensure stem is not rotating, as rotation
will damage the bellows.
12.4 Remove the GLAND NUTS (2) and the packing GLAND (3).
12.5 Remove the old PACKING (4) from the packing chamber, one layer
at a time, using a long thin tool to pry it out.
12.6 Install the new PACKING (4), one at a time, to fit along each side
of the gate. The ends must be square cut. Wrap the ends with TFE
tape to prevent fraying. The packing should be a perfect fit in the
seal & gate area on both sides.
12.7 Install the packing GLAND (3) and GLAND NUTS (2).
12.8 Ensure the gap between the gland and the gate is uniform all
around.
12.9 Tighten the gland nuts finger tight plus one half turn.
12.10 Lower the stem by rotating the handwheel clockwise while holding
the stem and fasten the stem to the gate with BOLTS & NUTS (5).
WARNING
Relieve line pressure before loosening gland nuts to avoid injury and/or
equipment damage. Fully close the valve. Ensure the line is empty, and
flush if necessary.
13.1 In Figure 21, switch off the electrical supply to the solenoid and
limit switches.
13.2 Remove the cylinder tubing and vent the air inside the
CYLINDER (1).
13.3 Disconnect the piston rod from the gate by removing the CLEVIS
BOLTS & NUTS (5).
13.4 Apply air slightly to the bottom port of the actuator so that the
piston rod is retracted from the gate.
13.5 Remove the actuator assembly from the valve by removing the
fasteners connecting the yokes to the valve body.
13.6 Remove the GLAND NUTS (2) and the GLAND (3).
13.7 Remove the old PACKING (4) from the packing chamber, one layer
at a time, using a long thin tool to pry it out.
13.0 PACKING REPLACEMENT - Cylinder Operated valves
Figure 21: Cylinder Operated
Valve Cutaway
4
3
2
5
1

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
16 of 20
13.8 Install the new PACKING (4), one at a time, to fit along each side
of the gate. The ends must be square cut. Wrap the ends with TFE
tape to prevent fraying. The packing should be a perfect fit in the
seal & gate area on both sides.
13.9 Install the packing GLAND (3) and GLAND NUTS (2).
13.10 Ensure the gap between the gland and the gate is uniform
all around.
13.11 Tighten the gland nuts finger tight plus one half turn.
13.12 Mount the actuator assembly to the valve by attaching fasteners
connecting the yokes to the valve body.
NOTICE
If leakage is observed from the packing area after installing the valve in
the pipeline and the valve is pressurized or charged with media, tighten
the gland nuts evenly side to side just enough to stop leakage.
Do not over-tighten the gland nuts.
Table 5: PACKING DETAILS
Valve Size Packing Size Length Quantity
NPS DN mm mm
250 Sq. 8 75 3
3 80 Sq. 10 110 3
4 100 Sq. 10 130 3
5 125 Sq. 10 180 3
6 150 Sq. 10 200 3
8 200 Sq. 10 235 3
10 250 Sq. 10 300 3
12 300 Sq. 10 350 3
14 350 Sq. 12.7 400 3
16 400 Sq. 12.7 450 3
18 450 Sq. 16 500 3
20 500 Sq. 16 550 4
24 600 Sq. 16 650 4

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
17 of 20
Figure 24: Remove the gate.
14.0 SEAL REPLACEMENT
14.1 Relieve the line pressure and close the valve. Flushing the line may
be necessary. Remove the valve from the line by loosening the
flange mounting bolts, studs, and nuts.
14.2 Clamp the valve in the vertical position to a fixture. Do not block
the valve port when clamping the valve. An overhead hoist may
be needed for larger size valves.
14.3 Disconnect the stem from the gate by removing the clevis, bolts,
and nuts. See Figure 23.
14.4 Remove the actuator and superstructure from the valve.
14.5 Remove the gland nuts, gland, and gland packing from the valve.
14.6 Remove the gate carefully from the valve body. Clean the gate and
smooth out any rough surfaces. Figure 24.
14.7 Remove the seal by pulling it out of the top of the valve body.
Figure 25.
14.8 Clean and inspect the body for any damage, particularly sharp
edges that may cut the seal. Smooth out if necessary.
14.9 Saturate the body seal groove area with a good water–soluble
lubricant that will not affect the seal or process. Inspect the new
seal and saturate both ends of the seal.
14.10 Insert one end of the seal from the top side. Reach into the
port area and pull the seal through the groove of the port area
and pull the seal from the top of the body. Ensure the seal is
not overstretched.
14.11 Install the gate and mount the actuator or handwheel. Operate
the gate to seat the seal into the bottom groove and cycle several
times. With the seal forced fully into the seal groove, cut each end
of the seal off to the required extended length.
Refer to Table 6.
14.12 While leaving the gate in the closed position, retract the actuator
to the open position.
14.13 Install the PTFE wiper and repack the valve. Adjust the packing
for tight shutoff when the valve is installed and pressurized to
operating pressure.
Figure 23: Lift clevis after removing
nuts & bolts.
Figure 25: Remove seal
CAUTION
Relieve line pressure before attempting to remove the valve from the line
to avoid personnel injury and/or equipment damage. If the valve has a
pneumatic actuator, solenoid valve, limit switches, or other accessories,
disconnect electrical and pneumatic supply.
Table 6: Seal Length
Valve Size Max Length
Up to 8" 20 mm
10" - 16" 25 mm
18" and Up 30 mm

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
18 of 20
15.0 TROUBLESHOOTING
TROUBLE POSSIBLE CAUSE SOLUTION
Packing leakage > Incompatible Media
> Packing Deteriorated
> Temperature Variations
> Normal Packing Wear
Replace packing.
Soft Seated Valve:
In fully closed position, seat leakage
Seat is worn or damaged. a) Remove worn or damaged seat.
b) Inspect and clean seat chamber,
install new seat.
Gate is damaged. Gate replacement.
High torque during valve seating
and unseating
Entrapped foreign media in
pipeline prohibiting valve from
seating
Please consult factory for proper
solutions.
Packing not tightened to
recommended torque.
a) Remove valve from service.
b) Review gate to seat interface.
Valve jerks during open and close Superstructure fasteners
loosened.
Tighten the superstructure fasteners.
Insufficient air supply. Pneumatic operated valves: Increase
supply pressure.
Solenoid valve dust
accumulation.
Remove and clean solenoid valve.
Piston rod seal damaged. Replace seal.
Packing is too tight. Loosen packing.

SERIES 740 BIDIRECTIONAL KNIFE GATE VALVE
Installation, Operation and Maintenance Manual
© 2019 BRAY INTERNATIONAL. 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.
19 of 20
16.0 RETURN MERCHANDISE AUTHORIZATION
16.1 All valves or valve parts that are returned require a Return
Merchandise Authorization (RMA). Contact a Bray representative to
obtain authorization and shipping instructions.
16.2 The following information must be provided when submitting RMA.
>Serial number
>Part number
>Month and year of manufacture
>Actuator specifics
>Application
>Media
>Operating temperature
>Operating pressure
>Total estimated cycles (since last installation or repair)
NOTE: Valve information is provided on identification tag attached
to valve (See Section 4.0).
NOTICE
Materials must be cleaned and sanitized prior to return. MSDS sheets and
Declaration of Decontamination are required.

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© 2019 Bray International. All rights reserved.
OM_Series_740_08-2019
All statements, technical information, and recommendations in this bulletin are for general use only. Consult Bray representatives or factory for the
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