Knife Gate Valves

Knife gate valves are used as isolation valves in lines where the medium contains sludge, suspended solids, fibres, sediment, or viscous materials. The flat gate travels perpendicular to the flow and cuts through the media, allowing shut-off in services where a conventional gate valve or butterfly valve may suffer solids build-up at the seat. They are intended primarily for on/off duty rather than continuous throttling, because operation in a partially open position increases wear on the blade, seat, and packing.

This category includes Zubi knife gate valves, type T200, in lug, unidirectional, bidirectional, and TAPPI/MSS SP-81 configurations, together with T300 short slurry, T300 through-conduit, T400 silo type, T500/T500BI high-pressure, T700, round-to-square, and square models. End connections cover PN6, PN10, PN16, PN25, PN40, ANSI Class 125/150, JIS 5K/10K, and corresponding flange standards, depending on series and valve size.

Selection between unidirectional and bidirectional design depends on pressure direction and shut-off requirements. Bidirectional versions incorporate guides and wedges on both sides to allow operation with flow and differential pressure from either direction. In silo-type designs, installation orientation and flushing ports affect solids accumulation and clean-out capability, and should be considered during valve selection.

Body materials include GG25, GGG40, ASTM A216 WCB, CF8, CF8M, CF3M, duplex, super duplex, and special stainless steels. Seat materials such as EPDM, NBR, silicone, Viton, graphite, PTFE, or metal-to-metal are selected based on chemical compatibility, temperature range, leakage class, and media abrasiveness. For higher pressure duties or corrosive and hazardous fluids, bonneted constructions should be considered, as they reduce exposed packing area and lower the risk of external leakage.

Knife Gate Valve - T200 - TAPPI (MSS SP-81) | Zubi Zubi Valves - 1

Knife Gate Valve - T200 - TAPPI (MSS SP-81) | Zubi

Knife Gate Valve - T200 - TAPPI (MSS SP-81) | Zubi
Zubi Valves
Knife Gate Valve Zubi T200 TAPPI / MSS-SP-81 The Zubi T200 TAPPI is a full bore lugged knife gate valve with a monoblock body, designed for flow isolation in lines with suspended solids, slurries, and viscous fluids. Available in unidirectional or bidirectional configurations; pressure direction is indicated by an arrow on the body. Sizes range from DN50...
View
Knife Gate Valve - T200 - LUG | Zubi Zubi Valves - 1

Knife Gate Valve - T200 - LUG | Zubi

Knife Gate Valve - T200 - LUG | Zubi
Zubi Valves
Zubi T200 Lug Knife Gate Valve The Zubi T200 Lug is a full bore isolation knife gate valve with a monoblock body and internal guides for the blade. The primary configuration is unidirectional: full pressure is applied towards the seat, while in reverse operation, the allowable pressure is limited to approximately 1/3 of the nominal. Operating Areas...
View
Knife Gate Valve - T200 - BIDIRECTIONAL | Zubi Zubi Valves - 1

Knife Gate Valve - T200 - BIDIRECTIONAL | Zubi

Knife Gate Valve - T200 - BIDIRECTIONAL | Zubi
Zubi Valves
Zubi T200 Bidirectional Knife Gate Valve The Zubi T200 Bidirectional is a knife gate isolation valve featuring a monoblock cast body, internal knife guides, and wedges on both sides, allowing it to operate with equal differential pressure in both directions. It is selected when pressure direction may reverse or when line section isolation is required from...
View
Knife Gate Valve - T200 - UNIDIRECTIONAL | Zubi Zubi Valves - 1

Knife Gate Valve - T200 - UNIDIRECTIONAL | Zubi

Knife Gate Valve - T200 - UNIDIRECTIONAL | Zubi
Zubi Valves
Knife Gate Valve Zubi T200 Unidirectional The Zubi T200 Unidirectional is a full bore isolation knife gate valve with a cast monoblock body and internal knife guides. It provides unidirectional sealing; the installation must ensure that the higher pressure pushes the knife towards the seat. In the opposite direction, allowable pressure is limited to...
View
Knife Gate Valve - T300 - SHORT SLURRY | Zubi Zubi Valves - 1

Knife Gate Valve - T300 - SHORT SLURRY | Zubi

Knife Gate Valve - T300 - SHORT SLURRY | Zubi
Zubi Valves
Zubi T300 Short Slurry Knife Gate Valve The Zubi T300 Short is a slurry knife gate valve with bi-directional sealing, featuring a split cast body in two parts and a short face-to-face as per manufacturer standard. The design includes two rubber sleeves that shield the body from direct contact with abrasive media and allow sleeve replacement as a key...
View
Knife Gate Valve - T300 - THROUGH CONDUIT | Zubi Zubi Valves - 1

Knife Gate Valve - T300 - THROUGH CONDUIT | Zubi

Knife Gate Valve - T300 - THROUGH CONDUIT | Zubi
Zubi Valves
Zubi T300 Through Conduit Knife Gate Valve The Zubi T300 Through Conduit is a wafer-type knife gate valve with a two-piece cast body, full bore flow, and double seat. The through-conduit design is intended for isolation in high-viscosity fluids where solid accumulation at the seat must be minimized. The double seat allows for tight isolation in both...
View
Knife Gate Valve - T400 - SILO TYPE | Zubi Zubi Valves - 1

Knife Gate Valve - T400 - SILO TYPE | Zubi

Knife Gate Valve - T400 - SILO TYPE | Zubi
Zubi Valves
Knife Gate Valve Zubi T400 Silo Type The Zubi T400 is a knife gate valve wafer, unidirectional, monoblock, designed for silo discharge, hopper outlets, and bulk handling lines with powders or granular solids. It is not intended for precise flow regulation; its primary function is isolation or controlled discharge of solid materials. Operating Principle...
View
Knife Gate Valve - T500/T500BI - HIGH PRESSURE | Zubi Zubi Valves - 1

Knife Gate Valve - T500/T500BI - HIGH PRESSURE | Zubi

Knife Gate Valve - T500/T500BI - HIGH PRESSURE | Zubi
Zubi Valves
Knife Gate Valve Zubi T500 / T500Bi for High Pressure Applications The Zubi T500 / T500Bi is a flanged knife gate valve designed for high-pressure services. The T500 model provides unidirectional sealing, while the T500Bi is used for bidirectional isolation. The body is monoblock with internal wedges and a bolted bonnet to minimize atmospheric leakage....
View
Knife Gate Valve - T700 | Zubi Zubi Valves - 1

Knife Gate Valve - T700 | Zubi

Knife Gate Valve - T700 | Zubi
Zubi Valves
Knife Gate Valve Zubi T700 The Zubi T700 is a bidirectional knife gate valve, full bore, with a monoblock body. It is primarily used for clean fluids or fluids with a small amount of suspended solids, where tight isolation is required in both flow directions. Available in wafer and lug designs. Operating Limits and Connections Range: DN50–DN250, pressure...
View
Knife Gate Valve - RC - ROUND SQUARE | Zubi Zubi Valves - 1

Knife Gate Valve - RC - ROUND SQUARE | Zubi

Knife Gate Valve - RC - ROUND SQUARE | Zubi
Zubi Valves
Zubi RC Round / Square Knife Gate Valve The Zubi RC Round/Square is a wafer-type knife gate valve designed for challenging discharge, recycling, pulp, and bulk solids applications. Its geometry features a circular inlet and a larger square outlet to minimize material jamming during the passage of solids or fibers. Construction and Operation The body is...
View
Knife Gate Valve - SQUARE MODEL VALVE | Zubi Zubi Valves - 1

Knife Gate Valve - SQUARE MODEL VALVE | Zubi

Knife Gate Valve - SQUARE MODEL VALVE | Zubi
Zubi Valves
Knife Gate Valve Zubi Square Model The Zubi Square Model is a square-section knife gate valve designed for low-pressure applications involving solid loads. It is primarily used at silo outlets, hoppers, and bulk handling lines where the flow involves powders, granules, or solid materials, rather than clean liquid pressure networks. The body is a...
View
Knife Gate Valve - FABRICATED SINGLE WEDGE | Zubi Zubi Valves - 1

Knife Gate Valve - FABRICATED SINGLE WEDGE | Zubi

Knife Gate Valve - FABRICATED SINGLE WEDGE | Zubi
Zubi Valves
Zubi Fabricated Single Wedge Knife Gate Valve The Zubi Fabricated Single Wedge is a flanged knife gate valve with a welded construction, available in unidirectional or bidirectional seat configurations. It is used in large diameter pipelines or services requiring a robust welded body instead of a cast body. The face-to-face dimensions are manufacturer...
View
Knife Gate Valves - DB Series | Wey Valves | Double Block & Bleed

Knife Gate Valves - DB Series | Wey Valves

Knife Gate Valves - DB Series | Wey Valves
Wey Valves
WEY DB Knife Gate Valve – Double Block & Bleed The WEY DB series is designed for positive isolation of pipelines carrying hazardous, corrosive or contamination-sensitive media. Two gates operate through a common actuator, creating two independent sealing points. The intermediate cavity includes connections for venting, draining or flushing, allowing...
View
Knife Gate Valves - DP Series | Wey Valves O-Port Isolation

Knife Gate Valves - DP Series | Wey Valves

Knife Gate Valves - DP Series | Wey Valves
Wey Valves
WEY DP Knife Gate Valve – O-Port Design The WEY DP series is a bidirectional isolation valve for media containing solids, long fibres or sedimenting particles. Its through-going O-Port gate moves across the full media column during closing, reducing the risk of solids packing in the seat area and limiting gate obstruction. Technical Data Nominal sizes:...
View
Full-Bore Knife Gate Valves - FB Series | Wey Valves

Knife Gate Valves - FB Series | Wey Valves

Knife Gate Valves - FB Series | Wey Valves
Wey Valves
WEY FB Knife Gate Valve – Full Bore Design The WEY FB series is a bidirectional isolation valve for pipelines requiring pigging or mechanical cleaning. Its full-bore geometry keeps the internal passage aligned with the nominal pipe diameter, while the gate guides remain outside the flow path. From DN200 upward, brass scrapers remove deposits from the gate...
View
Knife Gate Valves - HD Series | Wey Valves | High-Pressure Isolation

Knife Gate Valves - HD Series | Wey Valves

Knife Gate Valves - HD Series | Wey Valves
Wey Valves
WEY HD Knife Gate Valve – High-Pressure Service The WEY HD series is designed for isolation of high-pressure pipelines carrying slurry, sludge and media containing suspended or settling solids. Process pressure supports the seat sealing function, while the enclosed bonnet limits leakage to atmosphere and can be equipped with flushing connections for...
View
Knife Gate Valves - HSI Series | Wey Valves | Explosion Isolation

Knife Gate Valves - HSI Series | Wey Valves

Knife Gate Valves - HSI Series | Wey Valves
Wey Valves
WEY HSI Knife Gate Valve – High-Speed Isolation The WEY HSI series is designed for explosion isolation in pipelines carrying combustible dust or gas-air mixtures. After receiving a signal from the explosion detection system, the pneumatic mechanism releases air from the integrated reservoir and closes the gate before the pressure or flame front reaches...
View
Knife Gate Valves - MF Series | Wey Valves | Bidirectional

Knife Gate Valves - MF Series | Wey Valves

Knife Gate Valves - MF Series | Wey Valves
Wey Valves
WEY MF Knife Gate Valve – Central Flange Design The WEY MF series is a bidirectional isolation valve for liquids, sludge, slurry, powders and granular media. Its body geometry limits solids accumulation around the gate guides, while the gate is mechanically supported throughout its travel and in the closed position. Technical Data Nominal sizes:...
View
Knife Gate Valves - MG Series | Wey Valves | PN16 Service

Knife Gate Valves - MG Series | Wey Valves

Knife Gate Valves - MG Series | Wey Valves
Wey Valves
WEY MG Knife Gate Valve – PN16 Service The WEY MG series is a bidirectional isolation valve for liquids, sludge, slurry, powders and granular media. It retains the compact EN 558 Series 20 face-to-face dimension while covering operating pressures up to 16 bar. The gate is guided throughout its travel and mechanically supported in the closed position....
View
Knife Gate Valves - MH Series | Wey Valves | PN25 Slurry Service

Knife Gate Valves - MH Series | Wey Valves

Knife Gate Valves - MH Series | Wey Valves
Wey Valves
WEY MH Knife Gate Valve – PN25 Service The WEY MH series is a bidirectional isolation valve for slurry, sludge, viscous products and solids-bearing media at pressures up to 25 bar. The gate is guided throughout its travel and mechanically supported in the closed position to limit deformation under differential pressure. Technical Data Nominal sizes:...
View
Knife Gate Valves - SG Series | Wey Valves | Heavy-Duty O-Port

Knife Gate Valves - SG Series | Wey Valves

Knife Gate Valves - SG Series | Wey Valves
Wey Valves
WEY SG Knife Gate Valve – Heavy-Duty O-Port Design The WEY SG series is a full-flanged isolation valve for media containing high solids concentrations, long fibres or compacting material. Its through-going O-Port gate cuts across the static media column during closing. The four-column actuator frame absorbs the increased axial loads generated during...
View
Knife Gate Valves - TI3 Series | Wey Valves | DP Level Isolation

Knife Gate Valves - TI3 Series | Wey Valves

Knife Gate Valves - TI3 Series | Wey Valves
Wey Valves
WEY TI3 Knife Gate Valve – Level Transmitter Isolation The WEY TI3 series is designed to isolate differential-pressure level transmitters installed on slurry tanks. Its short face-to-face dimension reduces the dead volume between the vessel and the instrument, limiting solids accumulation that may cause blocked connections or inaccurate level readings....
View
Knife Gate Valves - VG Series | Wey Valves for Biogas Applications

Knife Gate Valves - VG Series | Wey Valves

Knife Gate Valves - VG Series | Wey Valves
Wey Valves
WEY VG Knife Gate Valve – Biogas Applications The WEY VG series is a bidirectional isolation valve developed for agricultural biogas plants. Its flange pattern is adapted to digester and substrate-handling equipment where standard industrial flange dimensions may not match the installed connections. Technical Data Nominal sizes: DN150 and DN200...
View
Knife Gate Valves - VK Series | Wey Valves | Square/Rectangular Ports

Knife Gate Valves - VK Series | Wey Valves

Knife Gate Valves - VK Series | Wey Valves
Wey Valves
WEY VK Knife Gate Valve – Square and Rectangular Ports The WEY VK series is a bidirectional isolation valve for square or rectangular ducts, silo outlets and hopper connections. The gate is mechanically guided throughout its travel, while body recesses allow displaced solids to move away from the sealing area during closing. In the closed position, the...
View
Showing 1-24 of 29 item(s)
Related posts
ISO 5752 Face-to-Face and Center-to-Face Dimensions for Industrial Valves
ISO 5752 Face-to-Face and Center-to-Face Dimensions for Industrial Valves
Posted in: Technical Standards Library, ISO Standards
06/29/2026
ISO 5752 is the international standard that specifies face-to-face (F2F) and center-to-face (C2F) dimensions for...
Read more
ISO 15848 Fugitive Emissions Standard for Industrial Valves
ISO 15848 Fugitive Emissions Standard for Industrial Valves
Posted in: Technical Standards Library, ISO Standards
06/29/2026
ISO 15848 is the international standard used to evaluate and classify fugitive emissions from industrial valves. The...
Read more
ISO 5208 Industrial Valve Pressure Testing and Leakage Rate Classification
ISO 5208 Industrial Valve Pressure Testing and Leakage Rate Classification
Posted in: Technical Standards Library, ISO Standards
06/14/2026
ISO 5208 is the international standard defining pressure testing procedures, leakage rate classifications and...
Read more
EN 12266 Pressure and Tightness Testing of Industrial Valves
EN 12266 Pressure and Tightness Testing of Industrial Valves
Posted in: Technical Standards Library, European EN Standards
06/13/2026
EN 12266 is the primary European standard defining pressure testing, tightness testing and acceptance criteria for...
Read more