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WEY new generation Knife Gate Valves by ; Sunsay




Established in Switzerland in 1964, SISTAG has been serving with 110 employees and over 40 distributors worldwide with production range of WEY brand Knife Gate Valve and Penstock (Channel) Valves.



Although SISTAG was founded in 1964, the company’s founders had been in the manufacturing sector since 1908, and it actually shows how old they are in the sector to have produced the first Knife Gate Valve in 1951. The company attributes its ability to manufacture knife gate valve, which is the main production line, in today’s latest technology to invest in R&D.

The company manufactures “Zero Leakage” valves classified as “Rate A” which are used in many sectors and industries such as mine, refining, food, chemical and petrochemical, biomass, paper, waste treatment, iron and steel, glass etc., especially in tough processes and applications, from PN10 pressure class to PN100, from DN50 diameter to DN2000, in Switzerland for European norm and in USA for ANSI (American) norm. Another of the most significant features of the firm is that it can produce at special dimensions other than standard ones.


Standard Options:

Washing bays Body protection ring for particulate

Gas proof covers liquids

Preformed packing Special (hard surfaced) coating

Larger pneumatic cylinders PTFE coated body

Nitrided, hardened, PTFE Polished body

coated Knife Lockable / Padlock can be installed

Body Seal Protective covers

Sledge system facilitating Double transverse seal

movement of the knife Special design knife for powdery liquids

Different body & knife materials V-shaped seal for flow regulation

Ni-hard wear ring Position indicator


The superior designed features of the valve compared to the other valves:

Additional sealing without disassembly when the valve is in line and under pressure

Body design with self-cleaning feature

Guided knife at full stroke (easy moving knife in the channel)

No jamming under no circumstance (zero leakage in all conditions)

Double-sided, impermeable, durable seal





Businesses such as Drinking and Tap Water Facilities, Waste Water Treatment Facilities, Waste Sludge Processes, etc.



Entry and exit control of stock tanks of paper pulp, viscous fluids containing particulate such as waste / raw paper-water mixture processes.



Sugar processes in which beet and sugar cane is used as raw material, Production processes of liquid sugar …



Viscous, sticky, granular, dusty fluid Processes, Process Applications such as Textile Wastewater, Chemical Industry Wastewater etc.



Fruit Pulp, Puree, Waste Raw Material Sludge Applications



Rolling Mill Applications, Coal and Powder Coal Transfer, Mining Operation Applications, Lime and Cement Process Applications.



Body / seal                         

protection ring for

particulate liquids.

(Deflector Cone)

Unique sealing designs in WEY are designed specifically for your process and operate with high performance.  

Manufactured with high quality standards, the WEY knife valve has proven itself over time with unique design.

It guarantees a longer usage time against the leaks arising from various reasons in comparison with its rivals.


1) Fulfilling the sealing function, the seal performs tightly with the lateral face of the knife smoothened by being processed. The fact that the lateral face of the knife is processed means more durable seal. Mechanically asserted to the body, the seal is also protected against disassembly problem.

2) Guide bearings of the knife prevent the knife from vibrating during on-off operation, thus ensuring noiseless operation.  In addition, this design guarantees double-sided sealing in all pressure grades and all seal types.



3) During the valve closing process, it cleans itself by glancing off accumulated residual materials due to the sharpened knifepoint.

4) During closure, it pushes the accumulated residues downward by means of the special blade geometry and puts out them through the extended discharge corners, thus preventing jamming and sticking.




5) The traditional seal box is removed with its unique Transverse Seal structure. Seal types selected specially for the process guarantees impermeability in certain conditions. Seal types are arranged to provide superior performance against leakage and abrasion under normal conditions.

6) The distance between the transverse seal and the port has been minimized. This prevents particles from accumulating between the body and the knife, thus preventing the blade from being jammed/stuck. This means the selection of the actuator with lower capacity and lower torque requirements.


7) It is possible to eliminate the leakage problem caused by the worn seals depending on the usage frequency without stopping the production (when the line is under                                                       pressure) by using unique packing screws. Thus, production losses during the time spent in demounting operations are prevented.




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New Alfa Laval Mixproof 3-body valve designed for hygienic processes




Looking for optimal process flow, outstanding hygiene, maximum uptime and low total cost of ownership?

The Alfa Laval Unique Mixproof 3-body valve with its modular, three-valve-body design provides reliable fluid handling and safety, making it perfect to use as a changeover valve for hygienic industries such as food, dairy, beverage and home-personal care. This translates into substantial savings and efficiency gains.

Cost-effective mixproof valve

Get exceptional results and save money by replacing two or more valves of other types with a single Alfa Laval Unique Mixproof 3-body valve. Two independent plugs and the fully balanced design enable two different fluids to pass through the same valve without risk of cross-contamination even in the event of pressure shock.

Exceptional spillage-free operation

Ensuring safe and hygienic operation, the double-seat design avoids cross-contamination while the double lip seals provide added protection for you to enjoy long-lasting, spillage-free operation.

Easy maintenance & optimal cleanability

Maintenance and cleaning are quick and easy due to a top-loaded design, no adjustable components, maintenance-friendly actuator and built-in leakage detection on all seals.

The Alfa Laval Unique Mixproof 3-body valve is always equipped with seat lift and seat push function hence meets stringent hygienic standards.

Easy to configure and upgrade

Optimize your hygienic process by customizing the Alfa Laval Unique Mixproof 3-body to suit your needs. Its modular design also makes it easy to apply the double seat valve whenever your process needs change while ensuring efficient, hygienic and continuous production.

You get the full benefit of using Alfa Laval Unique Mixproof valves by combining them with Alfa Laval ThinkTop and ThinkTop Basic valve sensing and control units.

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Emerson introduces powerful diagnostics for flow meter intelligence



Smart Meter Verification software allows users to fine tune and adjust their engineering processes to ensure absolute measurement confidence and top performance.

Advanced Smart Meter Verification diagnostics to deliver real-time intelligence and calibration of Coriolis and magnetic flow meters for a complete process overview and greater operational certainty.

Emerson has launched the latest version of its Smart Meter Verification software for Coriolis and magnetic flow meters, providing flow meter verification on demand and empowering process engineers, technicians and operators to look beyond the meter and make real-time decisions based on the most advanced meter and process diagnostics in the industry today.

New tools in the Smart Meter Verification software allow users to fine tune and adjust their engineering processes to ensure absolute measurement confidence and top performance in the chemicals, food and beverage, life sciences, oil and gas, and other process industries. In addition to onboard diagnostics, Smart Meter Verification also accelerates implementation of companies’ Industrial Internet of Things (IIoT) strategies with its powerful remote diagnostics, digital intelligence and multiple data points providing users with a complete process overview and greater operational certainty.

Rather than costly and time-consuming calibrations and laboratory testing, leading to production interruptions, shut-downs and safety concerns, the advanced Smart Meter Verification provides in situ calibration verification on-demand without any impact on process or meter outputs. The new system also provides operators with crucial information on other flow issues across the plant.

“Whereas traditional diagnostics often provide just an entry point to further, time-consuming analysis, the Smart Meter Verification system generates real-time, decision-making intelligence and flow measurement confidence here and now,” said Taylor Scott, software product specialist, Emerson Automation Solutions. “For plant operators and engineers, this move from reactive to predictive diagnostics means improved knowledge, operational certainty and productivity, and the acceleration of IIoT strategies.”

Key features of the advanced Smart Meter Verification include:

  • Innovative algorithms that detect corrosion and erosion in the meter with remedial action able to be instigated immediately. Emerson is also the first company to integrate a 99 percent-confidence statistical meter damage detection algorithm that enables early detection without false alarms.
  • New process diagnostic capabilities that include a “flow range” diagnostic, which alerts the engineer when flow rates are not within the specified range of the meter; instrument diagnostics that can identify if entrained gas is in the process; and immediate alerts to process upsets that may affect measurement performance, such as severe aeration.
  • Tube coating diagnostics that offer crucial data points and drive valuable information to the end user, alerting them when the meter is coated by something unexpected from the process line, particularly important in food and beverages and life sciences applications.
  • Clear and transparent verification audit trails, and advanced visual analysis and reporting software that meets third party regulatory agency compliance requirements in lieu of meter calibration, inspection or removal. By providing a time-stamped verification report, an increasing number of international standards and third-party agencies, such as ISO, IEC, AGA, API, NMI and others, recognise verification technologies, such as Smart Meter Verification, as a method to confirm instrument calibration and extend recalibration or proving intervals.
  • Reduced meter maintenance requirements with vital variables, such as mass flow, verified to be within factory accuracy specifications. Smart Meter Verification also generates detailed information on all sensors, including serial numbers, condition temperature and calibration information, ensuring a simple path to instrument and process compliance.

Emerson’s Smart Meter Verification diagnostics are an easy-to-use, automatic tool for Micro Motion™ Coriolis and Rosemount™ magnetic flow meters that monitor the entire flow meter’s performance and integrity and are applicable in a wide variety of process industry sectors, such as oil and gas, food and beverage and chemicals.

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New ORBINOX knife gate valve for Water Treatment Applications



ORBINOX has launched a new range of knife gate valves created especially for Water Treatment applications and designed to comply with both AWWA C520-14 and MSS SP-81 standards.

The EW series knife gate valve is a lug type unidirectional knife gate valve with a single ductile cast iron body. It has been designed to include bonnets if the application requires them, with both o-ring and conventional PTFE-impregnated type packings. The valve can be produced with metal-to-metal seats or 100% bubble-tight resilient seats and rising stem and non-rising stem configurations are available. Flange drilling is in accordance with ASME B16.5 class 150 and EN-1092 PN 10, Please note that alternative flange drillings are available on request.

The ORBINOX EW knife gate valve series is available in sizes ranging from 2” (DN50) up to 36” (DN900mm). It is suitable for working pressures of 10 bar up to 24” (DN600) and of 7 bar from 28” (DN700) up to 36” (DN900), and comes with either handwheel, gearbox, pneumatic cylinder, electric or hydraulic actuation options. Thanks to our experience in the design and manufacturing of specialist valves, we can adapt to suit specific application requirements by offering different materials or fabricated valves as required.

Here at ORBINOX we have used our extensive experience in the design and manufacturing of knife gate valves, check valves and penstocks to offer a comprehensive product range for various Water Treatment applications such as Water and Waste Water Treatment Plants, Water and Waste Water Pumping Stations, Sludge Handling, Storm Tanks, Desalination Plants and Irrigation Systems.

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