Trims eliminate cavitation damage
April 2013
Valves, Actuators & Pump Control
To complement its range of control valves, PSV Mitech offers a range of trims, chokes, diffuser plates and other devices for cavitation and noise control. All devices are manufactured in materials selected for their resistance to cavitation, flashing, wear and corrosion.
To prevent cavitation, energy dissipating ZZ trims are used to gradually reduce the energy of the incoming liquid. Energy is dissipated through friction and abrupt direction changes when the fluid moves through the ZZ passages of the retainer. This trim is generally suitable for sizes up to 80 mm.
Disk stack trims also eliminate cavitation by causing the pressure to be dropped gradually over a large number of restrictions in conditions involving high pressure drops and high flow rates. The disk stacks are usually used in valves of 100 mm and over.
The low noise trims feature a low noise retainer in which pressure is dropped across one or more restrictions. They are fitted in standard valve bodies to produce low noise valves, where noise level can be reduced by between 5 to 15 dBA. The noise reducing retainers are available as one, two or three stage units and are fitted above the seat ring in the gallery of the valve.
Energy dissipating disk stack trims are also used to reduce noise levels in high pressure drop gas applications. By converting the high potential energy upstream directly into heat, high velocities are avoided, resulting in less noise being generated.
Diffuser plates are disks with many holes drilled through the centre portion and which can be fitted between adjacent flanges in a pipe line. They increase the back pressure to the control valve installed upstream, reducing the pressure drop across the control valve and increasing the back pressure. This decreases valve gas velocity and noise generated in the immediate vicinity of the valve and often enables a smaller valve to be selected.
For more information contact Greg Walker, PSV Mitech Control Valves, +27 (0)11 657 6000, [email protected], www.mitech.co.za
Further reading:
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.
Read more...
ENERGYValves expands operations
Valves, Actuators & Pump Control
ENERGYValves is expanding its operations with a new facility in Cape Town. The new premises will significantly enhance the company’s capacity to serve the Cape Town market and surrounding areas.
Read more...
Revolutionising slurry management in mining operations
Valves, Actuators & Pump Control
Dynamic Fluid Control has launched the Vent-O-Mat Slurry Air Release Valve, designed to set new standards in performance and technology for the mining industry.
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...
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...
New system improves performance of magnetic drive pumps
Valves, Actuators & Pump Control
KSB Pumps and Valves has introduced its ground-breaking MagnoProtect system for the local petrochemical, chemical and general industry markets ,to enhance the safety and performance of its magnetic drive pumps.
Read more...
Emerson software optimises maintenance
Emerson Automation Solutions
Valves, Actuators & Pump Control
Emerson has announced the Plantweb Insight Valve Health Application, a powerful software tool that combines Fisher control valve expertise with advanced analytic algorithms. The new app makes it possible for users to visualise an entire connected fleet of valves, while prioritising actions based on the health index of each valve.
Read more...
Inline pumps for space-saving applications
Valves, Actuators & Pump Control
Pump manufacturer, KSB Pumps and Valves has introduced its latest EtaLine range of inline pumps, including the advanced EtaLine Pro for diverse applications such as HVAC, industrial recirculation, and heating systems.
Read more...
printer friendly version