Winning Together

KNIFE
GATE
VALVES

ISO 9001
Corporate Office - Production Site

Belgaum, Karnataka - India

Introduction >>
EXPERT, established in 1981 is a trusted n...
KNIFE
GATE
VALVES
Expert Knife Gate Valves provide reliable and long life on a variety of
tough applications including cor...
Stem
Yoke

Gland

Gate

Body

Technical
Features
of Unidirectional Valve

Guide Lugs

BODY :
The body is lugged type Wafer...
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

43...
ACTUATORS

Handwheel

Bevel Gear

The standard valves come with the Handwheel
arrangement (Rising Stem Type)

This arrange...
Pneumatic

Electric

Pneumatic actuators are provided for on-off
application service. The gate is operated by a
double act...
BI-DIRECTIONAL
VALVES
Expert Bi-Directional Valves have a bi-way system of sealing which ensures
100% tight shut-off in bo...
SPECIAL
VALVES
Bonneted
The bonneted valves have an enclosed bolted bonnet and are generally used when
extreme gland tight...
OPTIONAL
ACCESSORIES
Deflector Cone >>
Deflector cone is provided on the inlet of the valve for critical service
applicati...
BASIC
FLANGE DRILLING
DIMENSIONS

DN 700 & above
Full Lugged Design
EXPERT ENGINEERING ENTERPRISES
Works & Head Office :

Tel. : +91-831-2407140 (6 LInes)

24-A, Sy. No. 703/1, Majgaon Indus...
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Expert knife gate-valves

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Expert knife gate-valves

  1. 1. Winning Together KNIFE GATE VALVES ISO 9001
  2. 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. 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 >> n Wafer type, compact design. n Heavy duty single piece & two piece body, rigid construction ln Stainless steel gate, Self-cleaning, Beveled Edge, Precision machined for smooth operation & optimum sealing ln A wide range of materials of construction. ln Different actuators to suit the customer's requirement. ln Variety of seating options to suite different service conditions ln Manufactured & tested in accordance with MSS SP-81 and rated for 10 Bar CWP (upto 900 mm.) ln 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. 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. 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. 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. 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. 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 >> n n 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. n The bi-directional seal is of Nitrile rubber as standard but other seals such n Robust and compact fabricated superstructure. n Rising Stainless steel stem with double start ACME threads for easier and as Silicon / Viton are available on request. faster operation. n Suitable for mounting between a wide range of flanges. n Choice of drive arrangements / actuators. Typical Applications >> n Vacuum Service n Viscus fluid / powder containing air / gas n High pressure slurry n Dry powder isolation
  9. 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. 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 >> l Locking Device l Proximity Switches l Solenoid Valves l Air Filter (Regulator) l Fail Safe System l Chain for chain-wheel actuator l Meeting flanges & hardware l Manual Over-ride l Extended Stem l Limit Switches
  11. 11. BASIC FLANGE DRILLING DIMENSIONS DN 700 & above Full Lugged Design
  12. 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

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