Sliding gate control valves are easy to handle, compact, light and extremely precise. They provide accurate, fast and economic control of liquid, steam and gaseous media. At the heart of all sliding gate valves are two slotted discs, sliding across and against each other and forming a seal. One of them, the sealing plate, is permanently fixed in the valve body perpendicular to the direction of flow and has a certain number of transverse slots. The second disc, aligned so that it cannot rotate, has the same slot arrangement and moves perpendicularly to the sealing plate, thus changing the cross section of the flow. The pressure difference acts on the moving disc, forcing it against the stationary disc. This provides the seal in the sliding gate valve without the need for a metallic seat.
This superior structural principle forms the basis of an extremely short and compact construction with very low weight inherent in its design. As a result, the newly developed DN250 sliding gate valve weighs a mere 50 kg, including its actuator, whereas a globe valve of the same nominal size tips the scale at about 500 kg. This significant weight advantage not only reduces the space needed to install it, but also minimises the cost and effort to fit it. Because of the weight advantage of sliding gate valves, in most cases it is not necessary to provide additional support for the pipeline. As a general rule, the amount of labour needed in installation and maintenance is reduced to one person – without any need for lifting gear. And, of course, the lower material content is reflected in the price, particularly for stainless steel versions.
Furthermore, the sliding gate valve is characterised by other important advantages through its design which play an ever increasing role as size increases. Since the throttling elements are designed to be perpendicular to the flow, it needs very small actuation forces to operate it, so that, in contrast to the traditional globe valve, it needs barely one tenth of the force to position and close it. In the case of a DN250 sliding gate valve, the surface area of the diaphragm in the valve actuator is a mere 500 square centimetres to control a pressure difference of 10 bar. The comparatively low force requirement not only means significantly lower energy consumption, and, therefore, substantially lower operating costs, but is also visually evident, above all, in smaller and therefore much more economical valve actuators which are reflected on the scales and in the budget.
Benefitting additionally from a stroke of only 8,5 mm, switching times for a complete on/off process take less than a second, while in control mode, achievable positioning times of 2-3 seconds are obtained. Furthermore, the sliding gate valve offers favourable flow-related characteristic data, variable Kvs values and excellent rangeability. Added to this are extremely low rates of leakage, both internal as well as external, minimal wear, insensitivity to cavitation and reduced noise emission. The DN250 sliding gate valves from Schubert & Salzer Control Systems are available in PN16 and ANSI150 versions and, in summary, open up not only advantages for the process but also provide a tremendous savings potential through low operating costs during their service lives.
High-flow solenoid valve Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson has introduced the new ASCO Series 327C solenoid valve, which features a direct-acting, high-flow design that provides superior flow-to-power ratio. It permits high flows at minimum power levels, making it ideal for use in power plants, refineries, and chemical processing facilities.
Read more...Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...Proportional cartridge valve series is the fastest in its class
Valves, Actuators & Pump Control
Parker Hannifin is introducing the enhanced version of the proportional cartridge throttle valve series, TFP. The new pilot valve further reduces the step response times by up to 30%, making the TFP the fastest valve in its class.
Read more...Inspection system for leak detection in valves in hazardous areas Extech Safety Systems
Valves, Actuators & Pump Control
Leaking valves in industrial plants not only lead to loss, safety risks and possible contamination and pollution, but also result in high economic costs. Therefore, valves in hazardous areas require regular proper inspection and preventive maintenance to ensure their functionality.
Read more...Control head for automation of hygienic process valves Burkert South Africa
Valves, Actuators & Pump Control
Burkert’s Type 8681 control head is optimised for decentralised automation of hygienic process valves. Thanks to its universal adapter, it can be combined with all normal commercial butterfly valves, ball valves and single- and double-seated valves.
Read more...Hydroformed tube valve body Burkert South Africa
Valves, Actuators & Pump Control
One of the most common necessities for manufacturing pharmaceuticals, cosmetics, food and beverages are diaphragm valves. What used to be a dull two-way race between forged and cast body variants is now being challenged by an exciting, ground-breaking technology. The hydroformed, light-weight diaphragm tube valve body will change the way you think about plant design and operation.
Read more...Global pumping giant ready to support hydrogen economy
Valves, Actuators & Pump Control
With abundant sunshine and wind, southern Africa is perfectly positioned to become a global powerhouse in green hydrogen production. Two key projects are already in advanced stages of development in Namibia. KSB has identified the vast potential of these types of projects in southern Africa, and through its KSB Pumps and Valves subsidiaries in Namibia and South Africa is investing heavily in bringing the right skills to the region.
Read more...Compact valve position indicator Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson’s new TopWorx DVR Switchbox is an entry-level addition to the DV Series of valve position indicators. It combines a durable resin enclosure, compact size, and a patented cam design that provides a reliable valve position feedback for water and wastewater systems, food and beverage production lines, and industrial utilities.
Read more...Precision, control and performance in regulators and control valves Valve & Automation
Valves, Actuators & Pump Control
Cashco has long been a trusted name in industrial control solutions, offering a broad range of regulators and control valves designed to meet the rigorous demands of various industries. There are two key Cashco product lines, its regulators and the Ranger QCT control valve.
Read more...Advanced solutions for valves Bearing Man Group t/a BMG
Valves, Actuators & Pump Control
BMG delivers state-of-the-art valve solutions to diverse industries across Africa, in collaboration with InterApp, a global leader in the design and manufacture of high-quality valves.
printer friendly version