The type 4040 ball sector valve is used everywhere where conventional valves break down under severe operating conditions. They are ideal for providing precise control and the safe shut-off of difficult media, such as:
• Suspensions in the pulp and paper industry.
• Pasty media.
• Abrasive suspensions of ores, coal or ash.
• Effluents contaminated with solids or containing fibrous matter.
• Alkalis and acids.
• Oxygen, air or gaseous ammonia.
The ball sector
The key element at the heart of the new ball sector valve in the 4040 range is the ball sector. One part of the ball sector acts as the shut-off, while the other contains a hole whose diameter is normally about 80% of the nominal size of the valve. As the valve is closing, the cross section of the opening changes from completely round to elliptical. This change in shape reduces the risk of the ball sector valve becoming blocked when the valve opening is small or draining water from suspensions, or wearing out the valve at high flow speeds. At the same time, the ball sector seals off the medium even under harshest operating conditions by means of a seat ring against the valve body. The seat ring can be exchanged easily.
Outstanding control characteristics
The characteristic curve of the ball sector valve has an almost equal percentage profile. This curve represents the optimum for most operating conditions, in particular during operation if the differential pressure across the valve decreases over-proportionally as the degree of opening increases. Furthermore, this characteristic shape is more tolerant where the valve is oversized, since the valve, with its flat characteristic curve at the lower end of the opening range, provides an ample control range when only a portion of the Kvs value is being utilised. Additionally, the rangeability is an impressive 300:1, substantially underpinning the properties described above regarding control behaviour.
Special design features
The shafts for the ball sector in the Type 4040 valves are positioned centrally. As a result, any deposits on the surface of the ball are wiped off by the seat ring. Also, when the valve is being closed, no solid parts can become trapped between the seat ring and the ball sector.
By positioning the O-rings in the TA Luft-certified shaft guide in front of the bearing location, no abrasive substances in the medium can penetrate the bearings. Thus, the smooth operation and, therefore, the high control performance of the valve cannot be impaired.
In order to avoid the effects of thermal or mechanical stresses, the bearings and the shaft seals are housed in swivelling bearing bushings in the body.
Schubert & Salzer Control System’s ball sector valves in the 4040 range are supplied in nominal sizes from DN 25 to DN 300. Up to DN 250, the valves are wafer types, in DN 300 with flanges. The pressure stages available start at PN 16 and go up to PN 40 (ANSI 150 to ANSI 300). Depending on the nominal size, Kvs values from 12,5 up to 3840 are possible. These ball sector valves are produced in stainless steel 1.4408 as well as in special materials. Based on the sealing material selected, the ball sector valves can be used at temperatures up to 230°C.
Ball valves and actuators optimise HVAC performance Schneider Electric South Africa
Valves, Actuators & Pump Control
Schneider Electric offers the full range of innovative SpaceLogic and EasyLogic ball valves and actuators. These cutting-edge products are designed to optimise HVAC system performance, ensuring comfort and energy efficiency in commercial and residential buildings.
Read more...Alfa Laval expands hygienic valve portfolio
Valves, Actuators & Pump Control
Alfa Laval is expanding its hygienic valve portfolio by introducing the Unique SSV pressure relief valve and the Leakage Detection butterfly valve, alongside new smaller sizes of the Unique Mixproof CIP and Unique Mixproof process valves.
Read more...Preparing pump systems for adverse weather conditions
Valves, Actuators & Pump Control
As the severity of storms in South Africa increases, so has the rush of sediment-laden water become a major issue and a significant challenge for irrigation. When sediment levels rise to just 10 grams per litre or more, the risk of pump wear and dam silting increases dramatically.
Read more...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.
printer friendly version