Bray/VAAS 940 Series User manual

Bray/VAAS
Unidirectional Series Knife Gate Valve
940/950/952/980/985 Series
Operation and Maintenance Manual

Table of Contents
Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Cylinder-Operated Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Manual Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Packing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Seat Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Actuator Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Packing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
For information on this product and other Bray products please visit us at our web page - www.bray.com.
Unidirectional Series
Operations and Maintenance Manual

1
Unidirectional Series
Operation and Maintenance Manual
Definition of Terms - Safety Instructions
READ AND FOLLOW THESE INSTRUCTIONS
SAVE THESE INSTRUCTIONS
DEFINITION OF TERMS
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
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.
HAZARD-FREE USE
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 opera-
tion of the device assured.
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.
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.
QUALIFIED PERSONNEL
• 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 first aid
• 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
Unidirectional Series
Operation and Maintenance Manual
The valve must only be installed, commissioned, operated, and repaired by qualied personnel.
The device generates a large mechanical force during normal operation.
All installation, commissioning, operation, and maintenance must be performed under strict observation of all applicable
codes, standards, and safety regulations.
Observe all applicable safety regulations for valves installed in potentially explosive (hazardous) locations.
INTRODUCTION
The Bray/VAAS Series 940/950/952/980/985 provides repeatable unidirectional shutoff in a rugged, single-piece cast body.
Featuring both metal and soft seating, the Bray/VAAS Unidirectional Series gate valve caters to all types of unidirectional
sealing requirements across a wide range of industries.
Additional information about Unidirectional Series valves – including application data, engineering specifications, and
actuator selection is available from your Bray/VAAS distributor or sales representative.
UNPACKING
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.
Valve size and brief material specification of body (markings such as “SS” or “DI”) are marked on the valve body. A stainless
steel nameplate (below) afixed to the yoke of the valve contains most of the relevant information on the valve including
Bray/VAAS work order number and unique serial number of the valve. These details should be quoted for all requirements
of service and spares.
SERIAL NUMBER
SIZE MODEL FLG. DRILL BODY GATE
SEAT PACKING CWP MAX TEMP
STORAGE
Wrap the valve with a polyethylene cover. Cover the ports for pneumatic actuator/accessories with plastic caps. Store
these valves in the same packing indoors and without direct exposure to the environment.
If the valve is to be stored for a long period of time before installation, it should be stored in a vertical position (preferable) and
in a cool, clean area to prevent damaging effects on the packing.
Gate should be off the seat to prevent compression set.

3
Unidirectional Series
Operation and Maintenance Manual
INSTALLATION
• Valves can be mounted with flow in one direction. Flow directions are indicated on the valve as these would depend
on the application for which the valve is used. However, to enable correct orientation, the seat side of the valve can be
identified with the word “SEAT” marked on the body and on the gate top side.
• On horizontal lines, if there is a possibility of particles/solids settling at the bottom, it is preferable to install the valve so
that the stem is above horizontal/inclined/vertical.
• Install the valve between flanges using fasteners & gaskets.
• Bolt holes in the chest area are always blind tapped and care should be taken not to bottom the bolts while tightening.
Refer to GA Drawing/Technical Bulletin for quantity and size of blind tapped holes on valve chest area. If the correct
size bolts are not available, use studs and nuts for chest area bolts to avoid damage of body.
Support should be used for valves size 8” and over when installed in vertical pipe. Failure to do so can result in improper
valve operation and/or valve failure.
COMMISSIONING GUIDELINES
• 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.
• Check for gland leakage after the valve is subjected to pressure and if any leak is observed, tighten the gland uniformly
in a cris-cross pattern until the leakage stops.
Wrong 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.
Cylinder Operated Valves
1. Connect instrument quality air, preferably through an air filter/regulator of adequate size. The recommended air pres-
sure is 80-120 psi (5-8 bar). Refer to the appropriate bulletin/drawing for port and cylinder size details.
2. Ensure the supply air is free from moisture, dirt, and other foreign particles. 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.
3. 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. Ensure correct electrical supply is given to electrical accessories for proper func-
tioning and safety of the equipment.
4. Open the valve by energizing the solenoid valve/giving air supply to cylinder and operate the valve 2-3 times.
Manual valves
Open/Close the valve manually and observe valve operation.

4
Unidirectional Series
Operation and Maintenance Manual
MAINTENANCE
NOTICE
Any modification or use of unauthorized parts voids any and all warranty considerations.
Lubrication
The manual valve stem should be lubricated at regular intervals for smooth operation of the valve. A lubrication nipple is
provided on the collar. Cylinder operated valves do not require routine lubrication.
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.
Manual Valve Stem Cylinder Actuator

5
Unidirectional Series
Operation and Maintenance Manual
Packing Replacement
Relieve line pressure before loosening gland nuts to avoid injury and/or equipment damage.
1. Relieve the line pressure.
2. Fully close the valve.
3. Ensure the line is empty, and flush if necessary.
Manual Valves
1. Ensure the valve is fully closed.
2. Disconnect the stem from the gate (2) by removing the
clevis bolts & nuts (6).
3. Rotate the Handwheel (1) counter-clockwise by holding
the stem from rotation, so that the stem retracts fully
from the gate.
4. If valves are supplied with bellows, ensure stem is not
rotating, as rotation will damage the bellows.
5. Remove the gland nuts (5) and the gland (4).
6. Remove the old packing (3) from the packing chamber,
one layer at a time, using a long thin tool to pry it out.
7. If the lowest layer is a wiper ring (copper, Inconel etc.),
clean it with a common solvent; if damaged, replace
with a new one.
8. Insert the new packing one at a time ensuring that the
gate (2) is in full contact with the seat (gate fully down)
and not rubbing the bottom of the packing chamber.
Stagger the cut end of the packing so they do not line
up.
9. Tap each packing (3) ring firmly and evenly into the
chamber before installing the next ring; the ends of
each ring should meet but not overlap.
10. Install the packing gland (4) and gland nuts (5).
11. Ensure the gap between the gland and the gate is uni-
form all around
12. Tighten the gland nuts (5) finger tight plus one half
turn.
13. Lower the stem by rotating the handwheel clockwise
while holding the stem and fasten the stem to the gate
with nuts and bolts.
Cylinder operated valves
1. Switch off the electrical supply to the solenoid and limit switches.
2. Remove the cylinder tubing and vent the air inside the cylinder.
1
5
4
3
2
6

6
Unidirectional Series
Operation and Maintenance Manual
3. Disconnect the piston rod from the gate by removing the clevis bolts & nuts.
4. Apply air slightly to the bottom port of the actuator so that the piston rod is retracted from the gate.
5. Remove the actuator assembly from the valve by removing the fasteners connecting the yokes to the valve body.
6. Remove the gland nuts (5) and the gland (4).
7. Remove the old packing (3) from the packing chamber, one layer at a time, using a long thin tool to pry it out.
8. If the lowest layer is a wiper ring (copper, Inconel etc.), clean it with a common solvent; if damaged, replace with a new
one.
9. Insert the new packing one at a time ensuring that the gate (2) is in full contact with the seat (gate fully down) and not
rubbing the bottom of the packing chamber. Stagger the cut end of the packing so they do not line up.
10. Tap each packing (3) ring firmly and evenly into the chamber before installing the next ring; the ends of each ring should
meet but not overlap.
11. Install the packing gland (4) and gland nuts (5).
12. Ensure the gap between the gland and the gate is uniform all around
13. Tighten the gland nuts (5) finger tight plus one half turn.
14. Mount the actuator assembly to the valve by attaching the 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.
Seat Replacement
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.
1. Relieve the line pressure and close the valve. Flush the line if necessary.
2. Remove the valve from the line by loosening the flange mounting bolts, studs,
and nuts.
3. 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.
4. Disconnect the stem from the gate by removing the clevis, bolts, and nuts.
5. Remove one set of superstructure bolting and tilt the super structure to one side
as shown at right.
6. Lift the gate up until it fully clears the seat area and remove the old seat by tilt-
ing the top of the seat away from the body.
7. Insert the new seat with the bottom part first and lower the gate fully.
8. Bolt the super structure to the body again and then fasten the stem to gate
bolts.

7
Unidirectional Series
Operation and Maintenance Manual
Packing Details
Valve size, inch Packing Size, mm Length, mm Quantity
2 Sq. 8 180 3
3 Sq. 10 225 3
4 Sq. 10 280 3
5 Sq. 10 330 3
6 Sq. 10 395 3
8 Sq. 10 490 3
10 Sq. 10 580 3
12 Sq. 10 690 3
14 Sq. 12.7 765 3
16 Sq. 12.7 975 3
18 Sq. 16 1005 3
20 Sq. 16 1120 4
24 Sq. 16 1320 4
28 Sq. 19 1520 4
30 Sq. 19 1640 4
32 Sq. 19 1830 4
34 Sq. 19 1950 5
36 Sq. 19 2035 5
ACTUATOR MAINTENANCE
Pneumatic Cylinder
The Bray/VAAS pneumatic cylinder actuator is a low maintenance design and does not require routine maintenance. It has
an FRP tube which is lubricated for life with a special coating on the inside wall. Filtered dry, instrument quality air (non-
lubricated) should be used for its operation at the specified air supply pressure.
Recommended spare parts
Following are parts recommended as spares, which may be stocked. Following are general recommended spares for valves.
Provide the valve serial number and work order number from the nameplate for proper parts.
• Gland packing
• Spare Seat
• Cylinder repair kit

8
Unidirectional Series
Operation and Maintenance Manual
Troubleshooting
Trouble Possible cause Solution
Media oozing out of gland packing Packing deteriorated Replace packing
In fully closed position, valve leaks
Seat is worn out or torn Replace seat
Gate is scratched Replace gate
High torque during valve seating and
unseating
Misalignment between gate and stem
a) Remove the clevis fasteners
b) Loosen the superstructure fasteners
c) Adjust the alignment of the stem and
gate
d) Connect the clevis fasteners
e) Retighten superstructure fasteners
Packing is not tighten properly Adjust gland nuts
Valve jerks during open and close
Superstructure fasteners loosen Tighten the super structure 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
Unable to close or open the gate Gate is bent
a) Check for valve orientation, flow direc-
tion and flow indication
b) Re-orient the valve
c) Replace gate
All statements, technical information, and recommendations
in this bulletin are for general use only. Consult Bray/VAAS
representatives or factory for the specific requirements and
material selection for your intended application. The right to
change or modify product design or product without prior notice
is reserved. Patents issued and applied for worldwide.
Bray®is a registered trademark of
Bray International, Inc.
© 2015 Bray International, Inc. All rights reserved.
OM_Series_940_12_20_2016
Bray/VAAS
Division of Bray International, Inc.
13333 Westland East Blvd.
Houston, Texas 77041
Tel: [phone] • www.bray.com