Lugged Wafer Knife Gate

Lugged Wafer Knife Gate Valves

INSAMCOR - LW

DFC’s purpose is to solve typical and perennial valve problems. We achieve this by providing quality valves that provide the lowest cost of ownership and operation, highest reliability and minimum lifetime maintenance. DFC’s Insamcor range of lugged wafer ductile iron & stainless steel bidirectional knife gate valves feature a unique moulded body seal without seat pockets or cavities providing trouble free operation in slurry applications.

Design Features and Advantages

• Mechanically retained moulded body seal
• Gate guided through full length of the stroke
• Self-cleaning flush out corners prevent deposit build-up in sealing area
• Full bore unrestricted flow area - no seat pockets or cavities
• Bi-directional leak-proof sealing
• 150 psi CWP (10 bar) pressure rating for all sizes
• Adjustable stuffing box and gland design ensures leak-proof sealing to atmosphere
• Secondary transverse seal increases the wear life of the primary seal
• Built in PTFE scrapers keep the blade free from any foreign matter over the whole width of the blade during operation
• Yoke design allows for easy mounting of proximity and limit switches and also includes lockouts in both the open and closed position
• The mounting plate is designed to accept manual, pneumatic or electric actuation

Sealing Principle

In the fully open position the valve is sealed to atmosphere through a combination adjustable stuffing box acting as the primary seal and a secondary transverse seal. The purpose of the secondary seal is to act as a scraper and extends the life of the primary seal.

As the valve closes the gate remains in contact with the mechanically retained moulded body seal throughout the stroke and is guided by the valve body. When the gate approaches the fully closed position, the angle between the blade and the flush-out corners create turbulent flow of the media over the seating area. The turbulent flow removes all the sediment from the seat which allows the gate to fully close on the seating area free from any slurry build-up.

When the valve opens the gate again remains in contact with the body seal and is wiped clean by scraper blades that ensure trouble free operation during the next closing cycle.

Specifications

Optional

Pressure Rating
Sizes 2" - 6" (DN50-DN150) available as a 230 psi CWP (16 bar) valve

Gate
Different gate materials available on request

Actuators
Manual, manual be vel gear, p neu matic, electrome chanical, hydraulic and lever

Deflector Cones
Replaceable Ni-hard wear cone with gasket Polyure thane deflector cones

Seals
Various elastomers available

Ports
Vee & pentagonal ports for flow control

Features

1. Spindle cover - for protection against slurry splatter
2. Drive Mechanisms – pneumatic cylinder, electric, hydraulic cylinder, manual bevel gear and handwheel with rising spindle
3. Thrust assembly - all sizes fitted with thrust bearings as standard
4. Mounting plate - designed to accept manual, pneumatic or electric actuation without modification
5. Yoke - design allows for easy mounting of proximity and limit switches
6. Lockout - provision for lockouts in the open and closed position (standard on all sizes)
7. Moulded seal - mechanically retained resilient moulded seal guides the gate throughout its travel and ensures bi-directional leak proof sealing
8. Stuffing Box - external seal arrangement to atmosphere by means of an adjustable external stuffing box design and gland packing
9. Scrapers - during operation PTFE scrapers keep the blade free from any foreign matter over the whole width of the gate
10. Flushout corners - self cleaning flushout corners prevent deposit build up in sealing area
11. Seat pockets - full bore, unrestricted flow area. No valve seat pocket or cavity
12. Gate - polished stainless steel with bevelled edge at the base to cut through dense media

Ductile Iron - Soft Rubber Lined INSAMCOR^® LW Specification

The knife gate valve will be of wafer style and semi lugged design with the bore and connecting faces soft rubber lined. The design will allow for bi-directional flow against maximum operating pressure. The body seal must be fully moulded with a lip seal and must be mechanically retained in the valve body. The gate’s sides must remain in contact with the body seal during opening and closing of the valve and the gate must be guided by the valve body. The sealing to atmosphere must be achieved through a combination adjustable stuffing box acting as the primary seal and a secondary transverse seal. The internal bore will include self-cleaning flush out corners and there will be no seat pockets or cavities in the bore for media to settle in. The valve must incorporate PTFE scrapers to keep the blade free from any foreign matter over the whole width of the gate during operation.

Ductile Iron - Fusion Bonded Epoxy INSAMCOR^® LW Specification

The knife gate valve will be of wafer style and semi lugged design with a fusion bonded epoxy coated ductile iron body. The design will allow for bi-directional flow against maximum operating pressure. The body seal must be fully moulded with a lip seal and must be mechanically retained in the valve body. The gate’s sides must remain in contact with the body seal during opening and closing of the valve and the gate must be guided by the valve body. The sealing to atmosphere must be achieved through a combination adjustable stuffing box acting as the primary seal and secondary transverse seal. The internal bore will include self-cleaning flush out corners and there will be no seat pockets or cavities in the bore for media to settle in. The valve must incorporate PTFE scrapers to keep the blade free from any foreign matter over the whole width of the gate during operation.

Stainless Steel - INSAMCOR^® LW Specification

The knife gate valve will be of wafer style and semi lugged design with a CF8M stainless steel body. The design will allow for bi-directional flow against maximum operating pressure. The body seal must be machined PTFE and must be mechanically retained in the valve body. The gate’s sides must remain in contact with the body seal during opening and closing of the valve and the gate must be guided by the valve body. The sealing to atmosphere must be achieved through an adjustable stuffing box and gland design.The internal bore will include self-cleaning flush out corners and there will be no seat pockets or cavities in the bore for media to settle in. The valve must incorporate PTFE scrapers to keep the blade free from any foreign matter over the whole width of the gate during operation and PTFE anti-friction pads to keep the gate centralised and eliminate scoring between the gate and the body.

Applications

With a proven reputation of more than 25 years,Insamcor knife gate valves are well suited for a wide variety of industrial applications. DFC has one of the largest installed bases of mineral processing valves in the world and manufacturing facilities in South Africa, Finland and the USA. With sales and support facilities in Australia, North and South America, Europe, Asia, the middle East and Africa. DFC’s staff and agents are readily available and committed to solving your problems and providing you with the best possible service wherever your business is located.

Insamcor valves have been proven in a wide array of industries and applications. Examples include:

Mining

• Grinding
• Size seperation - hydro cyclones
• Flotation
• Thickening

Coal Fired Power Plants

• Lime slurry
• Fly ash slurry
• Scrubber slurry

Other

• Coal washing
• Steel
• Chemical
• Pulp & paper