MODEL HG

INSTALLATION, OPERATION & MAINTENANCE MANUAL

HG Knife Gate Valve

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 MODEL HG

INSTALLATION, OPERATION & MAINTENANCE MANUAL

HG Knife Gate Valve

0. INTRODUCTION

1. HANDLING

2. INSTALLATION

3. ACTUATORS
3.1. Handwheel
3.2. Bevel gear
3.3. Pneumatic
3.4. Electric
3.5. Hydraulic

4. MAINTENANCE
4.1. Packing seal replacement
4.2. Sealing sleeves replacement
4.3. Lubrication

5. STORAGE

6. ENVIRONMENTAL CONSIDERATIONS

7. PARTS LIST & DRAWING

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0. INTRODUCTION

The HG model knife gate is a full flange valve designed for a wide range of industrial
applications. The double-seated design provides bi-directional shut off. The design of the valve
body and the two rubber sleeves (3) makes the HG valve well suited for handling abrasive
slurries.

The two sleeves (3) are in permanent contact with each other when the valve is open. While the
valve is either open or closed, the media does not encounter the interior of the body. Minimal
leakage may occur from the bottom of the valve during opening and closing cycles.

Some leakage will occur from the bottom of the valve during operation. This allows solids to be
flushed from the body cavity and will ensure the full stroke of the valve.

General recommendations:

• The HG valve is recommended for slurry applications where resistance to abrasion and
erosion is critical. Slurry is defined as a liquid with relatively small particles, held in
suspension.
• The HG valve is not recommended in applications where erosion/abrasion is not critical.
• The lower splash guard must be adapted to the discharge system using the
connections supplied to avoid accumulation of solid materials that might damage the sleeves.
This solution is strongly recommended in applications with fluids that are very corrosive.
• Discharge from HG valves must be taken into consideration when exposure would be
hazardous to personnel or to the environment. Safety precautions, such as splash guard,
must be utilized to redirect the hazardous discharge to a safe location.

The HG valve complies with the following European directives:

• Machinery Directive

When applicable it can also comply with the following additional directives:

• Pressure Equipment Directive

• Potentially Explosive Atmospheres (ATEX)

It is the user’s liability to clearly inform the maximum working conditions (PS, TS), medium (gas
or liquid) and dangerousness group (1 or 2) and if the fluid is unstable to properly classify the
valve according the PED directive.

ORBINOX offers, supplies and certifies valves according to the information received from the
customer. The customer is liable to make sure this information is accurate and according to
specific working conditions requirements where the valve will be installed.

For EU Directives and other Certificates, please see the document:

Directives & Certificates Compliance - Knife Gate Valves - IOM

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1. HANDLING

The valves are packed according to the appropriate transport standards. If you receive the
packing damaged, please inform the transport company in writing and contact you ORBINOX
representative.

When handling an ORBINOX valve please pay attention to the following points:

• DO NOT ATTACH LIFTING GEAR TO THE VALVE ACTUATORS OR GATE GUARDS. They
are not designed to bear the weight and could easily be damaged.

• DO NOT LIFT THE VALVE BY THE VALVE BORE.

This can cause damage to the seating surfaces and seals.

• Check that selected lifting gear is rated to carry the weight of the valve. The valve can be
handled using eyebolts, soft straps or slings.

• EYEBOLTS: make sure the eyebolts have the same thread as the bolt holes and they are all
well secured. Ideally when using lifting gear to move an ORBINOX valve, it should be
supported by two or more eyebolts screwed into the tapped fixing holes in the valve body.

• SOFT STRAPS: with the valve in the closed position, the straps should be placed between
the gland area and the bore such that the valve is balanced.

Fig. 1 Handling with eyebolts Fig. 2 Handling with soft straps

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PNEUMATIC ACTUATED VALVES (Non-standard valves shall be checked case by case)

ORBINOX pneumatic valves (with Ø125 cylinder and above) are supplied with 2 lifting lugs for
a safe handling of the valve for vertical movements

Handling WARNING:

Lifting lugs are not machined so they could have sharp corners; soft straps or slings are
forbidden to be used with these lifting lugs

Below table shows the maximum weight of valve + pneumatic cylinder that 2 lifting lugs can
hold depending on lifting chain angle (X):

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With 2 lifting lugs: max. weight valve + cylinder (kg.)

L: minimum lifting chain length
CYLINDER
X: 60° X: 75°
Kg. Lmin (mm) Kg. Lmin (mm)
125 170 130 310 220
160 270 170 500 280
200 390 220 710 380
250 740 300 1335 500
300 1140 360 2030 600
350 1615 440 2835 720
400 2105 500 3660 830

• For horizontal movement, the valve shall be lifted mainly from the body and the yoke. See
above instructions for further instructions
• Cylinder’s lifting lugs can only be used during horizontal movement of the valve to help
balance the valve given the weight is hold at the body lifting point (center of gravity is approx.
centered on the body)
• The valve can be lowered from vertical to horizontal position when it is hanging from the
cylinder’s lifting lugs

2. INSTALLATION

For EU Directives and other Certificates, please see the document:

Directives & Certificates Compliance - Knife Gate Valves - IOM

In order to avoid personal injury or damage to property when handling and installing the valve, it
is important to observe the following warnings:

• It is the User’s responsibility to verify compatibility of valve parts materials with the internal fluid
• Qualified and trained personnel must carry out the handling and maintenance of the valve
• Use suitable Individual Protection Equipment (IPE) (gloves, safety footwear...)
• Disconnect all lines affecting the valve and put up a notice notifying that work is being carried
out on the valve
• Isolate the valve completely from the process
• Release process pressure
• Drain the fluid from the valve

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Before installation, inspect the valve body and components for any damage that may have
occurred during shipping or storage. Make sure the internal cavities within the valve body are
clean. Inspect the pipeline and mating flanges, making sure the pipe is free of foreign material
and that the flanges are clean.

The valve is bi-directional, and consequently permits installation without considering the flow
direction. Always install and keep the valve in the fully open position until it
starts normal operation.

Special care should be taken to maintain the correct distance between the flanges and to ensure
that they are parallel to the valve body.

Use caution to not cause damage to the sleeves by forcing the valve into an opening that is too
narrow when the valve is being positioned between the pipe flanges. It is possible to use a
lubricant (non-petroleum-based lubricant such as silicone or ordinary liquid soap) to help slip the
valve between the pipe flanges.

Incorrect alignment of the valve can cause deformations, which can lead to difficulties in
operation.

The following table gives the different valve face to face requirements before and after installation.

Dimensions (Metric)
DN 80 100 150 200 250 300 350 400 450 500 600 700 750 800 900
Before
Face 183 183 186 192 233 264 264 287 319 367 380 383 405 479 479
installation
to
After
face 175 175 178 184 225,5 257 257 279 311 359 371 373 395 467 467
installation

Dimensions (Imperial)

DN 3 4 6 8 10 12 14 16 18 20 24 28 30 32 36
Before
Face 7.20 7.20 7.32 7.55 9.17 10.39 10.39 11.29 12.55 14.44 14.96 15.08 15.94 18.85 18.85
installation
to
After
face 6.88 6.88 7 7.24 8.89 10.11 10.11 11 12.24 14.13 14.62 14.68 15.55 18.38 18.38
installation

Additional flange gaskets are not required as the outer face of the sleeve behaves as a gasket
against the pipe counter flange to provide a tight seal.

Enough space should be left between the flanges to permit ease of movement for the valve gate
with sleeves installed, without damaging them.

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The following table shows recommended torque values for the valve flange bolts:

Dimensions (Metric) Dimensions (Imperial)

PN-10 CL150 (ASME
DN T Torque DN T Torque
(EN B16.5/B16.47
(mm) (mm) (N.m) (inch) (in) (Ft/Lbs)
1092-1) Series A)
80 39 M16 70 3” 1 1/2” 5/8” - 11 UNC 52
100 39 M16 70 4” 1 1/2” 5/8” - 11 UNC 52
150 42 M20 140 6” 1 1/2” 3/4” - 10 UNC 103
200 45 M20 140 8” 1 3/4” 3/4” - 10 UNC 103
250 47 M20 140 10” 1 3/4” 7/8” - 9 UNC 103
300 52 M20 140 12” 2” 7/8” - 9 UNC 103
350 57 M20 140 14” 2 1/4” 1” - 8 UNC 103
400 61 M24 235 16” 2 1/4” 1” - 8 UNC 173
450 63 M24 235 18” 2 1/2” 1 1/8” - 7 UNC 173
500 67 M24 235 20” 2 1/2” 1 1/8” - 7 UNC 173
600 72 M27 350 24” 2 3/4” 1 1/4” - 7 UNC 258
700 72 M27 350 28” 2 3/4” 1 1/4” - 7 UNC 258
750 - - - 30” 4” 1 1/4” - 7 UNC 258
800 80 M30 470 32” 3” 1 1/2” - 6 UNC 347
900 84 M30 470 36” 3 1/4” 1 1/2” - 6 UNC 347

Dimensions (Imperial)
DN T CL300 Torque Torque
(inch) (in) (ASME B16.5/B16.47 Series A) (N.m) (Ft/Lbs)
3” 1 1/2” 3/4” - 10 UNC 70 52
4” 1 1/2” 3/4” - 10 UNC 70 52
6” 1 1/2” 3/4” - 10 UNC 140 103
8” 1 3/4” 7/8” - 9 UNC 140 103
10” 1 3/4” 1” - 8 UNC 140 103
12” 2” 1 1/8” - 7 UNC 140 103
14” 2 1/4” 1 1/8” - 7 UNC 140 103
16” 2 1/4” 1 1/4” - 7 UNC 235 173
18” 2 1/2” 1 1/4” - 7 UNC 235 173
20” 2 1/2” 1 1/4” - 7 UNC 235 173
24” 2 3/4” 1 1/2” - 6 UNC 350 258
28” 2 3/4” 1 5/8” 350 258
30” 4” 1 3/4” - 5 UNC 350 258
32” 3” 1 7/8” - 8 UNC 470 347
36” 3 1/4” 2” – 4.5 UNC 470 347

Select the recommended torque based on bolt size for other flange drilling patterns.
Make sure that cross-pattern tightening sequence is always followed.

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The valve can be mounted in any position regarding the pipe. However, it is advisable to place
it vertically in horizontal pipeline (A) if the installation allows it. (Please consult the technical
department at ORBINOX).

With larger diameters (> 300 mm/>12”), heavy actuators (pneumatic, electric, etc.), or with the
valve installed horizontally (B) or at an angle (C) on a horizontal pipeline, the installation will
require the construction of suitable supports. (See the following diagram and consult the
technical department at ORBINOX).

C C

B B

C* C*

A*

* For these positions please consult ORBINOX

The installation of suitable supports is advised when significant vibrations coming from the
piping are present.

In vertical pipelines, the construction of suitable supports is always required (for further
information please consult the technical department at ORBINOX).

The HG valve shall be installed between flanges. A counter flange is needed for a dead-end
service.
Once the valve is installed, test that the flanges have been fastened correctly and that all
electrical and/or pneumatic connections have been properly made.

Valves installed in an orientation with the actuator in or below horizontal may require flushing
to prevent the build-up of solids in the cavity. (Please consult the technical department at
ORBINOX).

IMPORTANT. Valves equipped with flushing shall also be equipped with a conventional leak
proof packing and a lower splash guard.
The operation of automated valves is limited only with fitted gate covers (Optional in North
America).

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 MODEL HG

First, operate the valve with no flow in the pipeline. Then test operation and valve seal with flow
running. During start up, make sure that there is no excess in the pipes. Once performance has
been tested, the valve can be put into operation.

All valves are delivered pre-treated with silicone lubricant. Prior to putting into service, check
that the valve has been well lubricated. All valves are equipped with a lubrication device.

It should be noted that the packing material might settle in shipping/storage, which can cause
minor leakage. This can be solved by tightening the gland follower (5) during installation. The
nuts should be tightened gradually and crosswise until the leakage stops (see the next figure).
Check that there is no metal contact between the gland follower (5) and the gate (2).

If the gland follower nuts are over torqued, the force needed to operate the valve will increase,
the valve function will be affected and the box packing lifetime will be shortened.

The table below shows the recommended maximum torques for the gland follower nuts.

DN (mm) Torque (N.m) DN (inch) Torque (Ft/Lbs)

80 - 200 15 3” - 8” 11
250 - 300 25 10” - 12” 18
350 - 600 30 14“ – 24” 22
700 - 900 35 28“ – 36” 26

IMPORTANT. The splash guard must be adapted to the discharge system using the
connections supplied to avoid accumulation of solid materials that might damage the sleeves
and foul the valve.

ATTENTION: DO NOT CLOSE BOTH ENDS OF THE LOWER PLATE

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Once performance has been tested, the valve can be put into operation.

Approximate weight of the handwheel-operated valve (rising stem):

Dimensions (Metric)
DN (mm) : kg
DN 80: 33 kg DN 250: 195 kg DN 450: 578 kg DN 800: 1575 kg
DN 100: 42 kg DN 300: 312 kg DN 500: 800 kg DN 900: 2085 kg
DN 150: 67 kg DN 350: 340 kg DN 600: 915 kg
DN 200: 148 kg DN 400: 440 kg DN 750: 1370 kg

Dimensions (Imperial)
DN (inch) : lbs
DN 3: 73 lbs DN 10: 430 lbs DN 18: 1274 lbs DN 32: 3472 lbs
DN 4: 92 lbs DN 12: 687 lbs DN 20: 1763 lbs DN 36: 4597 lbs
DN 6: 148 lbs DN 14: 749 lbs DN 24: 2017 lbs
DN 8: 326 lbs DN 16: 970 lbs DN 30: 3020 lbs

3. ACTUATORS

For EU Directives and other Certificates, please see the document:

Directives & Certificates Compliance - Knife Gate Valves - IOM

3.1. HANDWHEEL
To open the valve, turn the handwheel counter clockwise. To close, turn the handwheel
clockwise.

3.2. BEVEL GEAR

Bevel gear designed to get a pull force below 30 Kg.
To open the valve, turn the handwheel (10) counter clockwise. To close, turn the handwheel
clockwise.

3.3. PNEUMATIC
Valves are usually supplied with a double acting pneumatic actuator although, upon request,
we can supply single-acting actuators. In either case the feed pressure can vary between 3,5
and 10 bar. However, the size of the actuator for each valve has been designed for a feed
pressure of 6 bar.

It is essential for a good maintenance of the cylinder that air should be well dried, filtered
and lubricated. Air quality shall fulfil the following requirements:

• ISO 8573-1 Grade 5:4:3 for regular process (ON / OFF services).
• ISO 8573-1 Grade 5:3:3 for regular process at low temperature (-20 °C).
• ISO 8573-1 Grade 3:4:3 for cylinders with positioners.
• ISO 8573-1 Grade 3:3:3 for cylinders with positioners at low temperature (-20 °C)

It is recommended to actuate the cylinder 3-4 times before the start up, once it is installed in
the pipeline.

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3.4. ELECTRIC ACTUATOR

Depending on the type or make of the electric actuator, specific instructions (i.e. a
manufacturer’s manual) will be supplied.

Open/close limit switches setting

1. When operating the valve stand clear of any moving parts such as the stem and /or gate
assembly.
2. Maximum travel speed of the gate must equal or below 25 mm/s (1 in/s).
3. Care should be taken to ensure that electrical motors are wired correctly to the power
source. Incorrect phasing of 3-phase wiring may cause valve/motor damage.
4. Open and close positions of VG valves shall be controlled by means of the motor limit
switches. Do not use the motor torque settings to control the valve position.
5. Close position setting. Operate the valve manually to the fully close position until the end
of the gate is at the “A” distance and set the close limit switch. See below figure.

DN (mm/”) A (mm) A (in)

80/3” 45,5 1.79
100/4” 54 2.12
150/6” 52 2.05
200/8” 54 2.12
250/10” 53 2.09
300/12” 55 2.16
350/14” 72 2.83
400/16” 73 2.87
450/18” 75 2.95
500/20” 65 2.56
600/24” 70 2.75
800/32” 35 1.38
900/36” 30 1.18

6. Open position setting. Operate the valve to the fully open position until the gate moves
the distance “Y” as shown in figure below and set the open limit switch.

DN (mm/”) Y (mm) Y (in)

80/3” 115 4.5
100/4” 140 5.5
150/6” 200 7.9
200/8” 250 9.8
250/10” 315 12.4
300/12” 360 14.2
350/14” 415 15.0
400/16” 465 18.3
450/18” 520 20.5
500/20” 580 22.9
600/24” 700 27.6
800/32” 960 37.8
900/36” 1060 41.7

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3.5. HYDRAULIC
The valve is sized based on 100bar (1450 PSI) hydraulic supply pressure. The cylinder
stroke is a fixed length and does not require any adjustments.
Typically, the actuator travel speed is around 250 mm/min (9.8 in/min) or 0.005 m/s
(0.164 in/min).

4. MAINTENANCE
For EU Directives and other Certificates, please see the document:
Directives & Certificates Compliance - Knife Gate Valves - IOM

The valve must not undergo any modifications without a previous agreement with ORBINOX.
ORBINOX shall not be liable for any damages that may arise due to the use of non-original parts
or components

To avoid personal injury or damage to property from the release of process fluid:

• Those in charge of handling and maintenance of the valve must be qualified and trained in
valve operations.
• Use appropriate personal protection equipment (gloves, safety shoes, etc).
• Shut off all operating lines to the valve and place a warning sign.
• Isolate the valve completely from the process.
• Release process pressure.
• Drain the process fluid from the valve.

The only maintenance required is to change the packing seal (4) and the two rubber sleeves (3) as
well as the use of the grease nipples (7) for regular lubrication.
The life of these elements will depend on the working conditions of the valve such as: pressure,
temperature, abrasion, chemical action, number of operations, etc.

To allow optimal operation, the lower part of the valve, accessible through the splashguard (11)
should be cleaned regularly.
If the gate is brushed and cleaned regularly, the wear of the sleeves (3) can be minimised.

4.1. Replacement of the packing seal (4):

Depressurise the circuit and place the valve in close position.

1. Remove the gate guards (for automatically actuated valves only).
2. Release the spindle or stem (8) from the gate (2).

Photo 1

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3. Loosen the screws of the yoke (6) and remove it (without removing the actuator).
4. Loosen the nuts of the gland follower (5) and remove it. (Photo 3)
5. Remove the old packing rings (4) and clean the stuffing box.
6. Insert the new packing rings (4), making sure that the ring joints alternate (the first on one side
of the gate, the next on the other and so on). (Photo 4)
7. Once the necessary packing rings (4) have been inserted, proceed with a steady initial
tightening of the gland follower (5) (Photo 3)
8. Reinstall the yoke (6) (with the actuator).
9. Fix the stem (8) to the gate (2).
10. Reinstall the gate guards.
11.Carry out some operations with a loaded circuit and then re-tighten the gland follower (5) to
prevent leakage.

Photo 2 Photo 3

4.2. Replacement of the sealing sleeves (3):

1. Remove the valve from the pipeline.

2. Remove the sealing sleeves (3).
3. Set the gate (2) in the open position.
4. Clean within the bodies (1), filling the inner part of the body with silicone-based grease.
5. Lubricate the new sleeves (3) with the same grease (silicone-based) and install them.
6. Reinstall the valve in the pipeline.
7. Tighten the flanges.
8. Operate the valve a couple of times before leaving it in the position required for the process.

4.3. Lubrication:

A silicone-based lubricant is recommended and may be applied using the fittings provided in the
body. The gate may also be lubricated by spraying directly.
At a minimum HG valves should be lubricated every 100 strokes for 2” – 10” sizes and every 50
strokes for 12” – 48” sizes. If valves cycle very infrequently, less than once per month, lubrication
prior to each stroke is recommended.
Under no circumstances should a hydrocarbon-based lubricant be used.

Twice a year, it is recommended to fill up the stem protector (9) halfway with a calcium-based
grease with the following characteristics: highly water resistant, low ash content, and excellent
adherence.
As a reference: LUBEKRAFFT® Antiseize 907.

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5. STORAGE
Storage recommendations:

• Drain valves of any and all liquid.

• Indoor storage in a well-ventilated, clean and dry room is recommended, to avoid
moisture and condensation on the equipment.
• Valves should not be exposed to temperatures higher than 30ºC, as some soft seal
materials can be damaged when exposed to higher temperatures (sleeves, packing, …).
• If outdoor storage cannot be avoided, precautions should be taken to keep valves clean
and dry. Cover the valve and protect it from sources of heat or direct sunlight.
• During the storage, the valve must always be kept in the open position.
• The only exception is when the valve is supplied with a spring extend (spring to close)
cylinder. In this case the valve will be supplied with the gate in the closed position, with the
spring cylinder fully extended. DO NOT STORE the valve with the spring in a compressed,
fully energized position. For storage, it is recommended that the valve sleeves are removed
from the valve housing and stored separately from the valve. Reinsert sleeves prior to
installation.
• Avoid dirt and/or moisture contamination of the stem.
• To prevent contamination in the supply ports of the cylinders: ensure actuators have
appropriate pipe plugs installed.
• The sleeves must be totally relaxed during the storage and without any heavy objects on
them.
• Prior to start-up, clean the gate and apply grease according point 4.3. of this manual.
• For all other components installed on the valves, such as electric motors, solenoids, etc.,
please, consult their respective operational manuals.

6. ENVIRONMENTAL CONSIDERATIONS

• The packaging is made from environmentally friendly materials. Dispose of the packaging
through the available recycling channels

• The valve is designed and manufactured with materials that can be recycled by specialised
recycling firms. Once the life of the product is expired, you have to consider a proper
disposal of the product in order to prevent any negative impact on the environment and
allows for the recycling of valuable commodities

• Please follow the local environmental rules in your country for proper disposal

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7. PARTS LIST & DRAWINGS

12

1. BODY 7. GREASE NIPPLE

2. GATE 8. STEM
3. SELEEVES 9. STEM PROTECTOR
4. PTFE PACKING (+EPDM O-ring) 10. BEVEL GEAR
5. GLAND FOLLOWER 11. FLAT PLATE SPLASH GUARD
6. YOKE 12. TUBULAR SPLASH GUARD

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