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KNIFE GATE VALVE MV

Product catalog summary

Overview: This document details the specifications and configurations of Stafsjö's knife gate valve MV, designed for diverse applications involving both dry and wet media. The valve is modular, customizable, and available in various materials to suit different process conditions.

Specifications: The MV valve is offered in stainless steel or nodular iron, with high alloy options like Duplex and 254 SMO. It includes a retainer ring system for flexibility and multiple seat material options. Valve sizes range from DN 50 to DN 1600, with a one-piece body up to DN 800 and a two-piece body from DN 900.

Design Features: The valve provides reliable and tight shut-off with optimal internal clearances and a beveled edge gate. High-strength top works ensure gate alignment, using stainless steel tie rods within structural beams.

Configurations: Standard configurations include stainless steel and nodular iron versions, with various options for valve body, retainer rings, gate material, seats, box packings, top works, actuators, and flange drillings. Specific materials and temperature ranges are listed for each component.

Pressure and Temperature Ratings: Maximum working and differential pressures at 20°C are outlined for different valve sizes, along with service temperature ranges for various seat and box packing materials.

Design Standards and Testing: Valves comply with the pressure equipment directive 2014/68/EU and are CE marked when applicable. They undergo pressure tests per EN 12266-1:2009 rate A, with no detectable leakage allowed.

Corrosion Protection and ATEX Designs: Non-corrosive materials are coated to meet EN ISO 12944 class C3 standards, with optional coatings available. ATEX designs are available on request for specific zones.

Recommendations: For vertical flow applications with dry or abrasive media, it is recommended to install the MV with the seat side on the inlet side to reduce wear. Larger valves can be reinforced with reverse flow kits for additional support.

Dimensions and Flange Drilling: Detailed dimensions for one-piece and two-piece valve bodies are provided, along with flange drilling specifications according to standards like EN 1092, ASME/ANSI, JIS, and AS.

Catalog excerpts

Data is only for informational purpose. All specifications are subject to change without notice. First in knife gate solutions 2018-12-19 issue 24

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Knife gate valve MV Stafsjö’s knife gate valve MV can be used within a wide range of applications on both dry and wet media such as pulp stock up to 7% concentrations, sludge, slurry, biomass, water, ash, granulate and different kinds of waste. The MV valve is modular designed and it can easily be customized in materials, with actuators and related automation accessories to different process conditions. As standard it is available in a stainless steel or a nodular iron version, but it can also be supplied in a range of high alloy materials such as Duplex and 254 SMO. Stafsjö’s retainer ring system...

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Pressure class Max working pressure at 20 °C Max differential pressure in reverse pressure direction at 20 °C MV configurations Standard in stainless steel Standard in nodular iron Sizes: DN 50 - DN 1600 Valve body: Stainless steel EN 1.4408 Retainer ring: Stainless steel EN 1.4408 Gate: Stainless steel EN 1.4404, AISI 316L Box packing: TwinPack Top works: Stainless steel tie rods encapsulated in aluminum beams up to DN 1000 and stainless steel beams on larger ones including stainless steel gate guards on automated valves Seat, actuator, flange drilling and accessories available from options...

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Design standards Seat service temperatures Face-to-face dimensions Nitrile: -25 °C - +100 °C EPDM: -25 °C - +120 °C FKM: -15 °C - +180 °C Polyurethane: -25 °C - +90 °C PTFE with o-ring Nitrile: -25 °C - +100 °C PTFE with o-ring EPDM: -25 °C - +120 °C PTFE with o-ring FKM: -15 °C - +180 °C Stafsjö manufacturing standard. Option in MSS-SP81. Design, manufacturing, inspection and test According to pressure equipment directive 2014/68/EU category I and II module A2. The valves are CE marked when it is applicable. Stafsjö’s valves are subject for pressure tests before delivery in opened and closed...

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One piece valve body: DN 50 - DN 800 Two piece valve body: DN 900 - DN 1600 Part list Pos. Part Coated cast iron Stainless steel EN 1.4408 Coated nodular iron EN-JS1050, GGG50, GGG50 on MV-L < DN 300 Hand wheel Stud bolt Stainless steel A2, zinc coated Slide washer Stainless steel A2, zinc coated Stainless steel Valve body Body gasket Retainer ring Locking screw Guiding pads Gate guards Pneumatic cylinder See separate data sheet 1) Recommended spare part

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One piece valve body: DN 50 - DN 800 Two piece valve body: DN 900 - DN 1600 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...

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Flange drilling according to EN 1092 PN 10 DN Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt size Bolt lengths1) (mm) Bolt size Bolt lengths (mm) 1) Flange drilling according to EN 1092 PN 16 DN Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt size Bolt lengths1) (mm) Bolt size Bolt lengths1) (mm) Flange drilling according to ASME/ANSI B16.5 & B16.47...

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Flange drilling according to JIS B 2238 10K DN Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt size Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt size Bolt lengths1) (mm) Flange drilling according to AS 2129 Table D DN Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt circle diameter (mm) Number of throughgoing bolts Number of tapped holes/side Bolt size Screw lengths1) (mm) Bolt size Bolt lengths1) (mm) Flange drilling according to AS 2129 Table E DN Bolt circle diameter (mm)...

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