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KNIFE GATE VALVE WB 11

Product catalog summary

Overview: The Stafsjö WB11 knife gate valve is designed for superior flow characteristics and bi-directional zero leakage shut-off, suitable for various fluids including water, sludge, biomass, and light slurry. It features integrated flange gaskets for simplified installation and a modular design for customization.

Specifications: The valve body is made of nodular iron for sizes up to DN 300, with other versions available for different sizes and materials. The valve supports a maximum working pressure of 10 bar at 20°C for sizes DN 50 - DN 300.

Sealing System: The WB11 features a robust sealing system with TwinPack braids for external sealing, offering high mechanical strength and chemical resistance. The system is designed to handle a wide range of temperatures and chemicals, with specific materials like FEPM, Nitrile, and EPDM available for different applications.

Configurations and Options: Standard configurations include sizes DN 50 - DN 300 with a nodular iron valve body and stainless steel gate. Various options are available for gate materials, seats, actuators, and additional accessories like limit switches and solenoid valves.

Design Standards and Testing: The valve design complies with EN 558-1 and ISO 5752 standards, and it is tested according to EN 12266-1:2003 for pressure integrity. The valves are CE marked where applicable and can be customized for ATEX environments.

Corrosion Protection: Coated valve parts meet EN ISO 12944 class C3 standards, with optional coatings for higher protection levels.

Main Dimensions: Detailed dimensions are provided for various sizes, with recommendations for pneumatic cylinder sizing and electric motor interfaces.

Flange Drilling: The document provides specifications for flange drilling according to EN 1092 PN10 and ASME/ANSI B 16.5 Class 150 standards, including bolt sizes and lengths.

Catalog excerpts

Data is only for informational purpose. All specifications are subject to change without notice. First in knife gate solutions 2020-10-15 issue 14

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Knife gate valve WB11 Stafsjö's WB11 knife gate valve offers superior flow characteristics and bi-directional zero leakage shut-off. It is suitable for fluids such as water, sludge, bio mass and light slurry. Integrated flange gaskets simplify installation works. The WB11 valve is modular designed and it can easily be customized in materials, with actuators and related automation accessories to different process conditions. It is supplied with a robust one piece valve body in nodular iron up to DN 300. Other WB versions are the semi lugged WB in DN 350 - DN 1600, fully lugged WB14 in DN 50 -...

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The WB11 sealing system The gland (2) and gland bolts ensure even distribution of the gland force as the nuts are tightened. The valves' integrated flange (3) gaskets simplify the installation works and preserve a tight flange sealing. The perimeter resilient seat guarantee a tight sealing independent of pressure direction and the steel reinforcement (4) makes it steady and enhance durability. The linear locks (5) on the gland up to DN 300 securely hold the steel reinforced seat in position as the gate strokes. From DN 350 the seat is locked between the valve body halves. The WB14 valve can be...

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Pressure class Max working pressure at 20 °C Sizes: DN 50 - DN 300 Valve body: Nodular iron EN-JS1050, GGG50 Gate: Stainless steel EN 1.4301, AISI 304 Box packing: TwinPack Top works: Stainless steel tie rods encapsulated in aluminium beams including stainless steel gate guards on automated valves Options and others from below. Options Valve body Nodular iron EN-JS1050, GGG50 (Max +200°C) Actuators Hand wheel with non-rising stem Chain wheel Hand lever1) Ratchet wrench Bevel gear Double-acting pneumatic cylinders Single-acting pneumatic cylinders Electric actuators Hydraulic actuator Gate materials...

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Hand wheel Coated cast iron Ø 200 - Ø 315 EN-JL1040, GG25 Anodized aluminium Coated carbon steel ASTM A216 WCB, coated nodular iron EN-JS1050, GGG50 Slide washer Valve body Flange sealings Gate guards Pneumatic cylinder See separate data sheet 1) Recommended spare parts

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1) Recommended sizing of double-acting pneumatic cylinder type SC at normal operation with 5 bar air pressure. For other operating conditions, contact Stafsjö or your local representative for advice. 2) Recommended sizing of Auma SA electric motors at normal operation. For other operating conditions, contact Stafsjö or your local representative for advice. 3) Valve and Auma SA interface. The electric motors are mounted as standard according to ISO 5210 connection A (rising stem). 4) Weight in kg for valve equipped with hand wheel. Main dimensions are only for information. Contact Stafsjö for...

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N Flange drilling according to EN 1092 PN10 Number of tapped holes/side Number of throughgoing bolts Bolt circle diameter (mm) Flange drilling according EN 1092 PN10 + 4 extra tapped holes WB11k2) ß Number of tapped holes/side Bolt size 2) Pressures according to design data are not valid for valves with the special square WB11k drilling. Maximum working and differential pressure at 20°C for DN 150 - DN 200 is 4 bar. Flange drilling according to ASME/ANSI B 16.5 Class 150 DN Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side 1)Add the values with the thickness of...

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