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.
– 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
EXAMPLES FROM USAGE AREAS;
Businesses such as Drinking and Tap Water Facilities, Waste Water Treatment Facilities, Waste Sludge Processes, etc.
PAPER PULP AND PAPER INDUSTRY
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.
FOOD AND DRINK INDUSTRY
Fruit Pulp, Puree, Waste Raw Material Sludge Applications
POWER PLANTS AND MINING
Rolling Mill Applications, Coal and Powder Coal Transfer, Mining Operation Applications, Lime and Cement Process Applications.
Body / seal
protection ring for
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.
Butterfly valves… the ideal valve for sugar!
Sugar manufacturing poses a challenge to valve makers. The characteristics of the material to be handled, fluctuating pressures and high temperatures and viscosities present great demands to valve engineering.
Due to the competitive market situation in the world of sugar, nowadays the responsible factory managers of sugar factories are required to pay increasing attention to all available options of rationalization and cost savings. The availability of all system components has been especially scrutinized. Thinking in terms of life cycle cost and cost of ownership is gaining significance. While in the past many system components such as pumps and valves were simply replaced after the campaign, they now require much higher durability.
According to the sugar factory managers a high reliability and long service life, service friendliness and functional reliability are just as much on the priority list as the potential for automation. However, the most important element during the campaign is service around the clock. Most of the times the sugar factories expect service by mobile phone from the supplier any time of the day and night. Of course, all this also applies to the numerous valves and fittings. Valves are used everywhere in sugar production: From juice production to juice purification, juice concentration and sugar crystallization. While a typical production facility (referring to a 10,000-ton factory) has “only” 200 to 220 pumps, valves (typically: butterfly valves) can be found much more often. A beet processing factory of 13,000 tons/ day is estimated to utilize approximately 3,000 installed valves. With roughly 1,000 valves in the beet end (that is one third of the total number) most valves are used here; large quantities can also be found in the evaporation crystallizers in the sugar house, in the power station and especially in waste water treatment. When the factory is running sugar juices at the crystallization point, even the smallest temperature variations or thermal bridges are enough to crystallize the medium. A regular valve would clog immediately. Butterfly valves are not as sensitive and can be heated more easily.” Butterfly valves therefore cover the largest application scope of most media handled in the sugar factory.
Section of a soft sealing flucon shut-off valve, series, series 23/24. The fact that the elastomer (EPDM-H) is vulcanized onto the support ring can be clearly seen.The high temperatures and especially the vacuum are extremely critical for the valves used here.
The soft sealing flucon series 23/24 butterfly valve with replaceable EPDMH liners (resistant up to 130°C) by Airpower, showing best results in many evaporation crystallizers worldwide, provides the solution. With the flucon butterfly valves the elastomer is permanently vulcanized on the interchangeable support ring thereby ensuring a vacuum tight housing liner; the elastomer cannot be deformed caused by the vacuum. These valves are therefore particularly suitable for vacuum processes. Combined with the robust twintorque pneumatic actuators on/off or control valves offer the perfect solution for most critical applications in the sugar factories.
New control heads extend the life of process valves
Investing in high-quality process control valves have several operational advantages, including an extended service life. However, when just the valve actuators reach the end of their service life, the options can be limited, especially when the OEM parts are obsolete.
Fortunately for a UK based malt processer Bürkert has been able to provide a cost-effective retrofit solution for two hundred third-party valves, upgrading them with Bürkert Type 8691 control heads to keep the full complement operational for years to come.
The food and beverage industry uses process control valves extensively to manage the flow of liquids and gases throughout the manufacturing process. As such, their reliability is essential to the continued operation of the food manufacturing process: keeping sufficient spare parts available is therefore an important task.
However, as equipment ages, the original equipment manufacturer (OEM) may no longer support the product. At this point, maintenance managers can be left with just their own stock of spare parts, which will, inevitably, run out at some point.
In this case, the food manufacturer took the opportunity to investigate the alternatives, starting with replacing the control valves completely. With over 200 process control valves affected, replacement would be a substantial investment and the payback period would have been longer than desired.
At the same time, Bürkert, as an existing supplier to the company, was invited to offer a solution. Craig Kerr, Sales Manager at Bürkert, explains: “We were provided with a spare control valve from the production line and asked to deliver a proposal that would resolve the issue of ageing controls, while retaining the value in the valve body.”
As a major manufacturer of process control valves, Burkert could have offered a complete replacement valve, but having assessed the condition of the valve body decided that just the control head needed attention. The obsolete pneumatic actuator could be replaced with Bürkert’s Type 8691 control head with the simple addition of an adapting bracket to attach it to the legacy valves.
Plug & Play
Craig continues: “The manufacturing process operates a decentralised control system using ASI, with the valves either open or closed. Bürkert’s suggested solution would provide a simple, plug-and-play control head that would easily attach to the control valve body.”
In all, it would take less than an hour to replace each control head. This includes assigning an address for the PLC and using the tuning function where the operator presses the buttons to open and close the valve. The integrated valve position sensor registers these points and stores them to ensure reliable valve operation.
The Type 8691 is ideally suited to the food and beverage industry; being constructed from stainless steel, with excellent ingress protection ratings, it is easy to clean and has excellent chemical resistance properties. In addition, it is equipped with bright, coloured LED status indicators that show the position of the valve at a glance. Craig concludes: “The customer had the first unit on trial for a short period before ordering a further one hundred units. These were all installed and commissioned by the customer and one year on, they are all continuing to function reliably. This solution has been very cost-effective, saving thousands in process hardware and replacement costs by allowing the customer to retain the original valves and minimise any potential downtime from the upgrade.
Burkert Fluid Control Systems is one of the leading manufacturers of control and measuring systems for fluids and gases. The products have a wide variety of applications and are used by breweries and laboratories as well as in medical engineering and space technology. The company employs over 2,500 people and has a comprehensive network of branches in 36 countries world-wide.
New hydraulic tipping valve will increase productivity in tipping operations
Edbro is introducing a new hydraulic valve for tipping trucks, which will allow faster lowering than was previously possible. This will lead to a quicker turnaround time of tipping operations and therefore increased productivity.
Edbro, a member of the JOST World since 2012, is a highly regarded leader in the manufacture of on-vehicle hydraulics systems. It maintains its position at the forefront of the tipping market by always working to increase payloads, reduce tipping times and provide “fit and forget” solutions that require little or no servicing over their entire working life.
Replacing the incumbent CT range of valves, the UT valve is completely interchangeable with the older part. This ensures that vehicle operators can continue to maintain their existing hydraulic kits without any issue. Like its predecessor, the UT valve increases safety during lowering and offers lightweight performance.
The UT range introduces an optimised internal oil flow which reduces flow restrictions. As a result, the maximum lowering speed of the valve has been increased, reducing the time taken per tipping cycle. While this will be appreciated by all users, it will be particularly useful in quarrying and other operations where multiple tippings are made each day – the time savings on each cycle adding up so that the trucks can complete more runs per shift.
Danny Broomfield, Sales Director for UK & Ireland, comments: “The Edbro slogan is Lighter, Faster, Stronger. We achieve these goals by maximising the performance capabilities of every components found in our systems. The introduction of the UT valve will play its part in making sure our customers have the fastest and safest tippers on the market.”
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