Knife Gate Valves

Our sister company in Sweden Stafsjö Valves develop and manufacture high performance shut-off valves for pulp lines in pulp and paper mills, mineral processing and tailing systems in the mining industry, waste/effluent water/sludge handling for utilities and industries, ash handling at power stations and many others.  

 

WB / WB 11
Wafe Type Knife Gate valve for water applications.

These valves are all bi-directional and can therefore be installed into pipe systems independent of pressure direction. Full bore and excellent flow characteristics makes them suitable for fluids, sludge and liquids with solids in suspensions such as water, sewage and bio mass.

Nominal diameter:

DN 50 - DN 300, WB11
DN 350 - DN 1600, WB

Face-to-face:

EN 558-1 series 20
ISO 5752 series 20

Flange accommodation:

DN 50 - DN 300:
EN 1092 PN 10
ASME/ANSI B 16.5 Class 150
DN 350 - DN 1600:
EN 1092 PN 10
>= DN 700:
ANSI B16.47 Class 150, series A
AS 2129 Table D and E

Marking:

EN 19

Tightness check:

EN 12266 (Leakage Rate A)
ISO 5208 Class A

Temperature range:

max. 120 °C

Actuator:

Hand wheel, chain wheel, pneumatic cylinder, electric motor, hydraulic cylinder

Max. Operating pressure:

DN 50 - DN 300, 10 bar
DN 350 - DN 400, 6 bar
DN 500 - DN 600, 4 bar
DN 700 - DN 1200, 6 bar
DN 1400 - DN 1600, 4 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WB 12
Knife Gate Valve

These valves are all bi-directional and can therefore be installed into pipe systems independent of pressure direction. Full bore and excellent flow characteristics makes them suitable for fluids, sludge and liquids with solids in suspensions such as water, sewage and bio mass.

Nominal diameter:

DN 150 - DN 200

Marking:

EN 19

Tightness check:

EN 12266 (Leakage Rate A)
ISO 5208 Class A

Temperature range:

max. 90 °C

Actuator:

Handlever, handwheel, chain wheel, pneumatic cylinder, electric motor, hydraulic cylinder

Max. Operating pressure:

max. 4 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

WB 14
Lug Type Knife Gate Valve for water applications.

These valves are all bi-directional and can therefore be installed into pipe systems independent of pressure direction. Full bore and excellent flow characteristics makes them suitable for fluids, sludge and liquids with solids in suspensions such as water, sewage and bio mass.

Nominal diameter:

DN 50 - DN 600

Face-to-face:

EN 558-1 Series 20

Flange accommodation:

EN 1092 PN 10
EN 1092 PN 16
ASME/ANSI B 16.5
Class 150
AS 2129 Table D and E

Marking:

EN 19

Tightness check:

EN 12266 (Leakage Rate A)
ISO 5208 Class A

Temperature range:

max. 120 °C

Actuator:

Hand wheel, chain wheel, pneumatic cylinder, electric motor, hydraulic cylinder

Max. Operating pressure:

10 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WB 14E
Stainless Steel Lug Type Knife Gate Valve.

Stafsjö’s WB14E knife gate valve is a high performance shut-off valve with superior flow characteristics, offering bi-directional zero leakage shut-off up to 150 psi/10 bar. It is suitable for media such as pulp stock, chemicals, sludge, bio mass, slurry and water. The fully lugged body design is suitable for dead-end services.

Nominal diameter:

DN 80 - DN 600

Face-to-face:

MSS-SP81

Flange accommodation:

ASME/ANSI B 16.5
Class 150
AS 2129 Tabelle D and E

Tightness check:

EN 12266-1:2009 Rate A

Temperature range:

max. 120 °C

Actuator:

Hand wheel, chain wheel, pneumatic cylinder, electric motor, hydraulic cylinder

Max. Operating pressure:

DN 80 - DN 300, 10 bar
DN 350 - DN 450, 6 bar or 10 bar
DN 500 - DN 600, 4 bar or 10 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MV
Universally applicable Knife Gate Valve.

Stafsjö’s knife gate valve MV is used within many different fields of applications. The valve has a gate with a bevel edge that effectively cuts through different media. In closed position the gate is pushed onto the seat which gives a tight and reliable sealing. This special shut-off technique makes the MV valve suitable for both fluids and dry media such as pulp, sludge, biomass, powder and different kinds of waste.

Nominal diameter:

DN 50 - DN 1600

Face-to-face:

Company standard

Flange accommodation:

EN 1092 PN 10
EN 1092 PN 16
ASME/ANSI B16.5
Class 150
ASME/ANSI B16.47
Class 150, Serie A
JIS B 2238 10K
AS 2129 Table D and E
BS 10 Table D

Marking:

EN 19

Tightness check:

EN 12266 (Leakage Rate A)
ISO 5208 Class A

Actuator:

Hand wheel, ratchet wrench, chain wheel, bevel gear, pneumatic cylinder, electric motor, hydraulic cylinder

Max. Operating pressure:

DN 50 - DN 125, 16 bar
DN 150 - DN 300, 10 bar
DN 350 - DN 600, 6 bar
DN 700 - DN 1000, 4 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

XV
Knife Gate Valve

Stafsjö’s knife gate valve XV gives a secure and tight shut-off, independent of pressure direction. The valve has good flow characteristics and can be used in applications with pulp, biomass and sludge, and the Polyurethane seated version further extend its field of applications to abrasive media.

Nominal diameter:

DN 80 - DN 1000

Face-to-face:

DN 80 - DN 300 (EN 558 Series 20)
DN 350 - DN 800 (Company standard)

Flange accommodation:

EN 1092 PN 10
EN 1092 PN 16
ASME/ANSI B16.5
Class 150
ASME/ANSI B16.47
Class 150, Serie A
JIS B 2238 10K
AS 2129 Table D to E
BS 10 Table D

Marking:

EN 19

Tightness check:

EN 12266 (Leakage Rate A)
ISO 5208 Class A

Temperature range:

max. 180 °C

Max. Operating pressure:

DN 80 - DN 350, 10 bar
DN 400 - DN 600, 6 bar
DN 700 - DN 800, 4 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HG
A bi-directional tight Knife Gate Valve with a through-going plate.

Stafsjö’s knife gate valves HG have excellent flow characteristics and gives a bi-directional tight sealing. 

Nominal diameter:

DN 80 - DN 1200

Face-to-face:

Stafsjö manufacturing standard
MSS-SP81

Flange accommodation:

EN 1092 PN 10
EN 1092 PN 16
JIS B 2238 10K
ANSI/ASME B16.5
Class 150
ANSI/ASME B16.47
Class 150, series A
BS 10 Table D
AS 2129 Table D and E

Tightness check:

EN 12266-1:2009 rate A

Max. Operating pressure:

DN 80 - DN 250, 10 bar
DN 300 - DN 800, 6 bar
DN 900 - DN 1200, 4 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HP
Knife Gate Valve for high pressure applications.

Stafsjö’s high pressure knife gate valves HP, HPT and HX are all strenthened to withstand high bi-directional pressures. They are equipped with through-going "O" port gates and this secure a really safe and reliable shut-off of static and highly concentrated media. This shut-off performance, along with its excellent flow characteristics, makes them suitable for really demanding operating conditions with media as pulp (pulp concentration < 18%), liqour and highly concentrated slurry.

Nominal diameter:

DN 300 - DN 900

Face-to-face:

Stafsjö manufacturing standard
MSS SP-81
TAPPI TIS 405-8

Flange accommodation:

EN 1092 PN 10
EN 1092 PN 16
JIS B 2238 10K
ASME/ANSI B16.5 Class
150, ASME/ANSI B16.47
Class 150, series A

Tightness check:

EN 12266-1:2012 Rate A

Max. Operating pressure:

DN 300 - DN 800, 10 bar
DN 900, 6 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HPT
Knife Gate Valves for high pressure applications.

Stafsjö’s high pressure knife gate valves HP, HPT and HX are all strenthened to withstand high bi-directional pressures. They are equipped with through-going "O" port gates and this secure a really safe and reliable shut-off of static and highly concentrated media. This shut-off performance, along with its excellent flow characteristics, makes them suitable for really demanding operating conditions with media as pulp (pulp concentration < 18%), liqour and highly concentrated slurry.

Nominal diameter:

DN 200 - DN 600

Face-to-face:

Stafsjö manufacturing standard

Flange accommodation:

EN 1092 PN 10
JIS B 2238 10K
ANSI B16.5 Class 150

Tightness check:

EN 12266-1:2012 Rate A

Max. Operating pressure:

DN 200 - DN 600, 10 bar

 

 

 

 

 

 

 

 

 

 

 

 

HX
Knife Gate Valves for high pressure applications.

Stafsjö’s high pressure knife gate valves HP, HPT and HX are all strenthened to withstand high bi-directional pressures. They are equipped with through-going "O" port gates and this secure a really safe and reliable shut-off of static and highly concentrated media. This shut-off performance, along with its excellent flow characteristics, makes them suitable for really demanding operating conditions with media as pulp (pulp concentration < 18%), liqour and highly concentrated slurry.

Nominal diameter:

DN 200 - DN 800

Face-to-face:

Stafsjö manufacturing standard

Flange accommodation:

EN 1092 PN 16
EN 1092 PN 20
EN 1092 PN 25
EN 1092 PN 40
EN 1092 PN 50
ASME B16.5 Class 150
ASME B16.5 Class 300

Tightness check:

EN 12266-1:2009 Rate A

Max. Operating pressure:

DN 200 - DN 800, 20 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RKO
Knife Gate Valve for abrasive media.

Stafsjö’s knife gate valve RKO is reliable and particularly well suited for demanding reject and other abrasive media. The valve’s circular inlet and square outlet together with the gate, that has a rectangular shape and a bevel edge, counteracts clogging and blockages, which often is a problem in combination with junk traps, coarse reject and cleaners.

Nominal diameter:

DN 100 - DN 600

Face-to-face:

Stafsjö Weksnorm
TAPPI TIS 405-8
MSS SP-81

Flange accommodation:

EN 1092 PN 10
JIS B 2238 10K
ASME/ANSI B16.5
Class 150
AS Table D & E
BS Table D

Tightness check:

EN 12266-1:2009 Rate A

Max. Operating pressure:

DN 100 - DN 450, 10 bar
DN 500 - DN 600, 6 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

JT
Knife Gate Valve

This complete Junk Trap is designed for really tough process conditions handling difficult and abrasive media. The JT is specially designed to minimize turbulence, erosive wear, and build-up of solids and reject material.

Nominal diameter:

DN 100 - DN 150/250

Face-to-face:

Stafsjö manufacturing standard

Flange accommodation:

Stafsjö manufacturing standard

Tightness check:

EN 12266-1:2012 rate A

Max. Operating pressure:

6 bar

 

 

 

 

 

 

 

 

 

 

D2G
Knife Gate Valve with two plates.

Stafsjö’s knife gate valve D2G is a bi-directional tight valve with full bore. The valve is equipped with two hard chromed gates that works towards each other in the bore, which gives an extremely fast operation. This shut-off performance along with its flow characteristics makes it suitable for contaminated media or reject handling. The valve should be mounted only in a vertical pipe line.

Nominal diameter:

DN 100 - DN 600

Face-to-face:

Stafsjö manufacturing standard

Flange accommodation:

EN 1092 PN 10
JIS B 2238 10K
ASME/ANSI B16.5
and B16.47 Class 150,
series A

Max. Operating pressure:

DN 100 - DN 400, 10 bar
DN 500 - DN 600, 6 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

SLV
Knife Gate Valve for abrasive slurry.

Stafsjö’s knife gate valves SLV and SLF are particularly suitable for abrasive and demanding slurry where operation reliability and low life cycle cost are emphasized. The SLV is a lugged version while the SLF is fully flanged and especially suitable on old non-centred pipes or low pressure applications.

Nominal diameter:

DN 50 - DN 900

Face-to-face:

Stafsjö manufacturing
standard

Flange accommodation:

EN 1092 PN 10
AS 2129 Table D
AS 2129 Table E
ASME/ANSI B16.5
Class 150, ASME/
ANSI B16.47 Class
150 series A

Max. Operating pressure:

DN 50 - DN 600, 10 bar
DN 700 - DN 900, 5 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SLF
Knife Gate Valve

Stafsjö’s knife gate valves SLV and SLF are particularly suitable for abrasive and demanding slurry where operation reliability and low life cycle cost are emphasized. The SLV is a lugged version while the SLF is fully flanged and especially suitable on old non-centred pipes or low pressure applications.

Nominal diameter:

DN 80 - DN 400

Face-to-face:

Stafsjö manufacturing standard

Flange accommodation:

EN 1092 PN 10
ASME/ANSI B16.5
Class 150
AS 2129 Table D
AS 2129 Table E

Tightness check:

EN 12266-1:2012 rate A

Max. Operating pressure:

DN 80 - DN 400, 10 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

SLX
High pressure knife gate valve

Stafsjö’s knife gate valves SLH and SLX are designed for the most demanding high pressure applications with slurry and other abrasive media where operation reliability and low life cycle cost are emphasized. The SLH is designed for pressure up 20 bar/290 psi while the SLX is designed for 50 bar/720 psi.

Nominal diameter:

DN 80 - DN 450

Flange accommodation:

EN 1092 PN20
EN 1092 PN25
EN 1092 PN40
EN 1092 PN50
ASME/ANSI B16.5 Class 150
ASME/ANSI B16.5 Class 300
AS 2129 Table F/H

Tightness check:

EN 12266-1:2012 Rate A

Max. Operating pressure:

DN 80 - DN 450, 50 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

TV
Knife Gate Valve

Stafsjö’s knife gate valve TV is used as an isolation valve for a transmitter or sensor on a tank for which a short face-to-face length is required.

Nominal diameter:

DN 80

Face-to-face:

Stafsjö manufacturing standard
MSS SP-81
TAPPI TIS 405-8

Flange accommodation:

EN 1092 PN 10-
Stafsjö standard
ASME/ANSI B16.5
Class 150-
Stafsjö standard
ASME/ANSI B16.5
Class 150-
ASME/ANSI B

Tightness check:

EN 12266-1:2012 rate A

Max. Operating pressure:

DN 80, 16 bar

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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