1. Winning Together
KNIFE
GATE
VALVES
ISO 9001

2. Corporate Office - Production Site
Belgaum, Karnataka - India
Introduction >>
EXPERT, established in 1981 is a trusted name in the Indian market. The experience of over 25
years, a wide range of industrial valves and the state-of-art manufacturing set-up are our key
strengths. A customer-focused organizational philosophy and investment in the best technology
and human resources has enabled us to constantly meet the exacting standards set by our
customers. We deliver Quality products that bring tangible business value to the customers in
India and abroad. Our products are being sold in the International Markets by us directly, as well
as by the major users and the OEM's in India, with whom we have collaborative business
relationships. Our focus is to enhance the customer base globally through joint ventures and
strategic alliances.
We trust that "Winning Together" is the key to long lasting relationships.
Think
Valve
Think
Expert
ADVANTAGE
WIN-WIN Approach
Growth Orientation
On Time Deliveries
Range of High Quality Products
Shorter Product Development Cycles
Quicker Response to New Customer Needs
Adopting Best International Working Practices
ISO
9O
O1
CERTIFIED

3. KNIFE
GATE
VALVES
Expert Knife Gate Valves provide reliable and long life on a variety of
tough applications including corrosive and abrasive services. Key
aspects like operating loads, ease of operation, service conditions
etc. are considered in its design and construction to ensure long and
maintenance
free service life. Through continuous
process
improvement our products are competitive enough to meet the global
requirements. Expert Knife Gate Valves are designed for isolation, onoff and throttling applications.
Features of Unidirectional Knife Gate Valves >>
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Wafer type, compact design.
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Heavy duty single piece & two piece body, rigid construction
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Stainless steel gate, Self-cleaning, Beveled Edge, Precision machined for smooth operation & optimum sealing
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A wide range of materials of construction.
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Different actuators to suit the customer's requirement.
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Variety of seating options to suite different service conditions
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Manufactured & tested in accordance with MSS SP-81 and rated for 10 Bar CWP (upto 900 mm.)
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Available in sizes 50 mm (2") to 1800 mm (72").
Applications >>
Knife Gate Valve has a wide range of application as a shut-off valve in pipelines and hoppers. It is perhaps the only valve,
which can be used in hopper isolation. The beveled gate cuts through the fluid by dislodging any material in the seating
area. In a highly abrasive application deflector cone is used to prevent the body from direct impingement of abrasive
media.
The Knife Gate Valves find application in industries such as Pulp & Paper, Cement, Aluminum, Carbon Black, Fertilizer,
Sugar, Coal & Mining, Power Generation, Ash Handling, Iron & Steel, Sewage & Waste Water Treatment, Food and
beverage etc.

4. Stem
Yoke
Gland
Gate
Body
Technical
Features
of Unidirectional Valve
Guide Lugs
BODY :
The body is lugged type Wafer Design single piece of
Cast steel / Stainless steel (Investment Cast upto 200
mm). It is designed to withstand pipeline stresses while
in service. The body is available in variety of materials
that provide corrosion and abrasion resistance. Guide
Lugs are provided on the body to hold the gate securely
against the raised face seat to assure positive shutoff.
The body has drilled and tapped lugs on the outer rim
drilled & tapped in accordance with different flange
standards such as BS10 TD, BS10 TE, PN10, ANSI 150
etc.
GATE :
Precision machined thick Stainless steel gate provides
good sealing and smooth operation. The beveled knifelike edge pushes aside or cuts through solids in the flow
stream. The gates are available in different materials to
suit various applications.
STEM :
The Stem is of stainless steel with double start ACME
threads, designed to reduce operating torque and for
easier, faster operation & longer life.
GLAND :
The Investment Cast Gland is of Cast steel / Stainless
steel with precisely controlled dimensions to ensure
minimum gap between Body and Gate to have better
performance.
GLAND PACKING :
The Gland Packing is Multi-layered square PTFE
Impregnated packing for complete leak tightness and to
offer seal to the atmosphere. High temperature packing
0
available upto 1200C and other options are available for
different applications.
YOKE :
The heavy duty fabricated Yoke is designed to provide
support, strength & withstand stresses.
YOKE SLEEVE :
The Bronze Yoke Sleeve provides corrosion resistance
and assures easy operation. A grease fitting provides
lubrication to the sleeve and stem.
SEAT OPTIONS :
The valves are available in metal seated and resilient
seated round port designs.
ACTUATOR :
The standard valves are provided with hand-wheel. The
other actuators such as Chain Wheel, Lever, Bevel Gear,
Pneumatic Cylinder & Electric Motor are available on
request.

5. BASIC
VALVE
DIMENSIONS
SIZES
A
B
P
N
L
50
48
203
294
347
420
65
48
203
330
400
450
80
51
203
350
437
520
100
51
203
379
480
565
125
57
270
422
548
600
150
57
270
466
615
725
200
70
270
620
878
970
250
70
390
696
948
1045
300
76
390
798
1100
1112
350
76
500
896
1238
1238
400
89
500
982
1374
1374
450
89
500
1070
1518
1530
500
114
500
1160
1655
1655
600
114
500
1432
2051
2051
NOTE :
- All dimensions are in mm, unless otherwise specified.
- In the process of continuous improvement, the data given herein is subject to change.

6. ACTUATORS
Handwheel
Bevel Gear
The standard valves come with the Handwheel
arrangement (Rising Stem Type)
This arrangement is provided in application
where space limitations prohibit use of standard
hand-wheel. A mechanical advantage makes
operation of large size valves easier and faster.
A Chain Wheel is provided in place of hand-wheel
in applications where the valve is located at an
elevation. The length of the chain needs to be
specified at the time of placing the order.

7. Pneumatic
Electric
Pneumatic actuators are provided for on-off
application service. The gate is operated by a
double acting pneumatic cylinder. Accessories like
solenoid valves, limit switches etc. are provided as
per customer's requirement / specification.
Electric Motor Actuators are provided for on-off
or throttling applications. They are provided
with manual over-ride arrangement to take care
in case of power failure. The service conditions,
type of application, speed of operation, electric
characteristics are the factors governing the
actuator selection.
Lever actuators are suitable for smaller
valves (below 300 mm). They are used
where actuation forces are small and rapid
valve operation is required or where space
prevents use of standard hand-wheel or
worm gear.

8. BI-DIRECTIONAL
VALVES
Expert Bi-Directional Valves have a bi-way system of sealing which ensures
100% tight shut-off in both directions of flow. This is achieved by having two
body halves with a continuous pressurized seal in contact with the machined
blade edge at all the times. It also ensures that the blade is kept central
throughout its total travel.
The two piece bolted body facilitates easy seal replacement. The full port of the
body minimizes resistance to flow and terminals.
The seal is reinforced with steel insert which provides the adequate strength
and ensures long life under different conditions. The seals are available in
different material of constructions to suit the application.
These valves find a typical application in isolation of slurry, hopper installations,
pneumatic conveying systems, high pressure slurry lines.
Features >>
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Slim and compact, light weight and easy to install.
These valves are manufactured with variety of material of constructions
such as cast iron, carbon steel, SS 304 / SS 316 etc.
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The bi-directional seal is of Nitrile rubber as standard but other seals such
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Robust and compact fabricated superstructure.
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Rising Stainless steel stem with double start ACME threads for easier and
as Silicon / Viton are available on request.
faster operation.
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Suitable for mounting between a wide range of flanges.
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Choice of drive arrangements / actuators.
Typical Applications >>
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Vacuum Service
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Viscus fluid / powder containing air / gas
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High pressure slurry
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Dry powder isolation

9. SPECIAL
VALVES
Bonneted
The bonneted valves have an enclosed bolted bonnet and are generally used when
extreme gland tightness is desired for applications such as toxic gas.
Square Opening
The square opening valves are used to handle powders or dry solids.
They are designed to function at low pressures. These are custom made
and manufactured in various materials and sizes to suit the customer's
need.
'O' Port Valves
These valves are typically used in applications such as rejected / recycled paper and pulp
stock. The 'O' port valves have a through going gate with a circular opening in it. The flushing
port at the bottom helps to clean the valve body as and when required.
V-Orifice
The metal seated V-port design version of Knife Gate Valve is
available for throttling application. The constant V-orifice is
maintained to ensure maximum control accuracy.
Pulp Valves
Pulp valves / Slide Gate Valves are split body design valves and are typically used in
applications involving dry powders, dust, fibrous material .

10. OPTIONAL
ACCESSORIES
Deflector Cone >>
Deflector cone is provided on the inlet of the valve for critical service
application where abrasion is high. The Deflector cone is normally of
Ni-hard material and protects the valve body. It is installed between the valve
and the pipe flanges and diverts the abrasive material flow to the valve.
Flow
The typical application involve Bin bottom, for dry solids, mining slurries,
fly-ash, bag-filter, cyclone bottom.
Purge Connection >>
The purge connections are used to flush the seat area and minimize the chance of
material getting clogged on the seat, thus helping smooth operation of the gate.
Purge connections are located at 5 and 7 'O' clock positions on 6" and smaller size
valves and at 3,5,7 and 9 'O' clock positions on 8" and larger size valves. The
purge connection can also be provided in the chest area and is normally
furnished with pipe plugs and are used only for flushing if required.
DOUBLE ACTING
ACTUATOR
Fail Safe System >>
General Arrangement Drawing
C2
2
SIGNAL
4
2
4
P
3
1
5
3
1
5
C1
5/2 SPOOL VALVE
3/2 SOLENOID VALVE
CAPACITY
TANK
AFR
MIN. AIR SUPPLY 70 PSI
NRV
Surface Treatment >>
The valve components can be offered with protective coatings / surface treatment typically hard facing of seat
areas (Stelliting / Nitriding of body, seat and gate edge) is done, depending on the application to increase the life
expectancy.
Other Accessories >>
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Locking Device
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Proximity Switches l Solenoid Valves
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Air Filter (Regulator) l Fail Safe System
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Chain for chain-wheel actuator l Meeting flanges & hardware
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Manual Over-ride l Extended Stem
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Limit Switches

11. BASIC
FLANGE DRILLING
DIMENSIONS
DN 700 & above
Full Lugged Design

12. EXPERT ENGINEERING ENTERPRISES
Works & Head Office :
Tel. : +91-831-2407140 (6 LInes)
24-A, Sy. No. 703/1, Majgaon Industrial Estate,
Fax : +91-831-2407141
BELGAUM - 590 008. KARNATAKA - INDIA.
mail@expertvalves.com
w w w . e x p e r t v a l v e s . c o m
Expert reserves the right to change product designs and specification without notice.
Printed in Sept. 2008
FR/MKT/07-04