VL series by WEY Sistag

VL Series: The Seal of Confidence.
LINDER offers the WEY VL Series valve, where innovation meets reliability. The advanced lug design delivers both economy and top-tier performance. Built from stainless steel to withstand corrosion, its core advantage is a 100% bidirectional bubble-tight seal, ensuring ultimate safety and customer trust.

Application areas
Chemical and petrochemical industries, Food and beverage, Infrastructure, Pulp and paper industry, Water treatment

Characteristics VL series

Nominal sizes
DN 50 – 900 mm
Pressure rating
PN 0 – 10 bar
Material
Stainless steel, Special material
Flange drilling
ANSI Class 150
Face to face dimension
MSS-SP81
Handwheel
Handwheel
Bevel gear
Bevel gear
Pneumatic cylinder
Pneumatic cylinder
Hydraulic cylinder
Hydraulic cylinder
Electric actuator
Electric actuator

Details

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A unique transverse seal, consisting of a transverse seal profile and packing compound, makes the body bubble-tight towards the atmosphere.
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The transverse seal can be repacked at any time and under full pressure using the lateral packing screws.
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Robust 4-post topwork for maximum load and a wide variety of actuator types.
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With its optimized gate geometry, accumulated media is pushed out of the gate guide and flushed out into the bore by the increased flow.
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In the closed end position, the gate is also mechanically supported.

About VL series by WEY Sistag

Engineered for the Extreme: The WEY SISTAG VL Series Knife Gate Valve – Available in Turkey from Official Dealer LİNDER

In the most critical nodes of industrial infrastructure—where processes handle corrosive media, abrasive slurries, and extreme pressures—equipment failure is not an operational hiccup; it is a costly, dangerous event. Here, standard valves are a liability. This is the engineering challenge that the WEY SISTAG VL Series Knife Gate Valve was born to conquer.

LİNDER ENDÜSTRİ DIŞ TİCARET LİMİTED ŞİRKETİ is proud to be the Official Authorized Dealer for WEY SISTAG in Turkey. This partnership is a strategic alliance, bringing Swiss-engineered precision, legendary durability, and uncompromising safety standards directly to Turkish heavy industry. We don’t just sell valves; we deliver engineered solutions and long-term operational security.

Why Choose the Official WEY SISTAG Dealer in Turkey?

Selecting LİNDER as your source for WEY SISTAG valves means accessing more than a product catalog. It means gaining a local partner with direct technical lineage to the manufacturer. We provide:

  • Genuine Product Guarantee: Every VL Series valve is sourced directly, ensuring authenticity, full certification, and manufacturer warranty.
  • Local Engineering Expertise: Our technical team in Turkey possesses deep application knowledge for sectors from mining to chemical processing.
  • Integrated Solution Provision: We handle the complete process: sizing, actuator selection (pneumatic, electric, hydraulic), supply, and after-sales support.
  • Reduced Total Cost of Ownership (TCO): By providing the correct valve for your specific duty, we optimize longevity and minimize downtime, delivering superior value over the asset’s lifecycle.

The VL Series: A Paradigm Shift in Knife Gate Valve Technology

The WEY SISTAG VL Series redefines reliability. It transcends being a simple isolation device to become a guaranteed sealing system, engineered to perform where others fail.

1. Absolute Bidirectional Bubble-Tight Shut-Off

The core mandate of any critical valve is to seal, completely. The VL Series delivers a 100% bubble-tight shut-off in both flow directions. This eliminates product loss, prevents environmental contamination, and safeguards downstream processes, ensuring operational integrity and regulatory compliance under the most severe differential pressures.

2. Revolutionary In-Line Maintenance: The Repackable Transverse Seal

Traditional valve maintenance is a shutdown event. The VL Series features a patented, transversely mounted stem sealing system. Its genius lies in repackability under full line pressure via lateral access screws. This eliminates complete disassembly, turning what was a day-long maintenance task into a matter of minutes, drastically boosting plant availability.

3. Unyielding Structural Integrity: 4-Post Topwork Design

Built on a foundation of a heavy-duty 4-post topwork structure, the VL Series is designed to withstand maximum operational loads and stresses. This robust framework ensures perfect alignment, accommodates any actuator type, and guarantees stable, reliable performance throughout its extended service life.

4. Intelligent, Anti-Clogging Gate Design

Abrasive and fibrous media cause packing and accelerated wear in standard valves. The VL Series combats this with an optimized, self-cleaning gate geometry. During operation, the gate actively expels solids from the guide channel into the flow, preventing build-up and ensuring smooth, consistent cycling even with the most challenging media like pulp, sludge, or granules.

5. Positive Gate Support for Vibration-Free Operation

Under high differential pressure, unsupported gates can vibrate or deflect, damaging the seal. The VL Series provides direct mechanical support to the gate in the closed position. This critical feature eliminates chatter, protects sealing surfaces, and ensures the bubble-tight seal is maintained consistently, cycle after cycle.

Technical Specifications: Built for Demanding Duty

The VL Series is engineered with premium materials and to exacting international standards, ensuring compatibility and reliability in global industrial applications.

  • Nominal Diameter (DN): 50 – 900 mm
  • Pressure Rating (PN): 0 – 10 bar
  • Standard Body Material: ASTM A351 CF8M (316 Stainless Steel)
  • Flange Standard: ANSI Class 150 / PN10/16
  • Face-to-Face Dimension: MSS-SP-81 Short Pattern
  • Primary Seat Seal: Aflas® (TFE/P) for superior chemical and temperature resistance (up to 200°C). EPDM, NBR, and other elastomers available.
  • Actuation: Compatible with manual (handwheel, gear), pneumatic, electric, and hydraulic actuators.

Dominating Critical Applications Across Turkish Industry

The WEY SISTAG VL Series is the valve of choice for Turkey’s core industrial sectors where reliability is non-negotiable:

  • Mining & Mineral Processing: Abrasive tailings slurries, thickener underflow, process water.
  • Chemical & Petrochemical: Aggressive acids, alkalis, polymers, catalysts, and slurry services.
  • Power Generation (Thermal & Renewable): Flue gas desulphurization (FGD) slurry, bottom ash, process water.
  • Pulp & Paper: All pulp consistencies (1-15%), black/white/green liquor, coating additives.
  • Water & Wastewater Treatment: Raw sewage, activated sludge, treated effluent, seawater intake.
  • Steel & Cement: Slurry lines, dust suppression systems, and process water control.

Your Reliable Partner for Swiss Engineering in Turkey

As the official dealer for WEY SISTAG, LİNDER ENDÜSTRİ provides a seamless bridge between Swiss manufacturing excellence and the needs of Turkish industry. We offer end-to-end support, from initial technical consultation and precise sizing to logistics, commissioning support, and lifecycle service.

LİNDER ENDÜSTRİ DIŞ TİCARET LİMİTED ŞİRKETİ
Your Reliable Partner for WEY SISTAG in Turkey
Website: www.linder.com.tr
Email: sales@linder.com.tr
Phone: +90 544 720 0012

Contact our engineering department today for a technical consultation, detailed specifications, and a competitive offer for the WEY SISTAG VL Series and other premium industrial valve solutions.