R/€ = 13.05
R/$ = 11.99
Au 1201.95 $/oz
Pt 1151.00 $/oz
May 12, 2006
Diffuser plates for globe control valvesBack
© Reuse this Locally-manufactured Spirax-Mitech diffuser plates are designed for use with their globe control valve on high-pressure drop applications for gases and vapours.
Installed downstream from the valve, the diffuser plates are designed to create a back pressure at the valve. On high-pressure drop gas applications the valve size is selected to maintain the velocity at the outlet within the limit of Mach 0,33 (one third of sonic) by creating a back pressure – the gas or vapour is more compressed and, therefore, a smaller valve can be selected and still keep the velocity within acceptable limits.
Special trims, such as Low Noise or ED Disk Stack, are still often required inside the valve as the downstream plate is not effective at creating back pressure at low flow rates. In these conditions, the valve sees the full pressure drop. However, the velocity in the smaller valve is still acceptable due to the lower flow rate.
Usually the valve size can be reduced to less than half the size it would have to be without the plate, resulting in significant savings, particularly when the sizes involved are large. Several diffuser plates can be installed in series in an expanding pipework system, or they can be built into a single holder for ease of installation.
A typical application that can use this technology is a steam pressure-reducing station.
Edited by: Laura Tyrer© Reuse this Comment Guidelines (150 word limit)
Other Valves News
Global forecasts of increased growth in the pumps, valves and pipes sector reflect market realities and include predictions of growth in Africa, which is evident in the strong industry support for the forthcoming Pumps, Valves & Pipes Africa (PVPA) Expo, which takes...
A mining-specific diverter valve, designed to improve the efficiency of paste backfill operations, is experiencing significant interest in the South African market after being launched in the country at the Electra Mining Africa trade show, which was held from...
Continuous development in the design and manufacture of plastic valves has created an opportunity for these valves in the potable-water market that was previously dominated by metal valves, says Cape Town-based piping systems company Alprene Plastic Products.
Recent Research Reports
Electricity 2015: A review of South Africa's electricity sector (PDF Report)
Creamer Media’s Electricity 2015 report provides an overview of State-owned power utility Eskom and independent power producers, as well as electricity planning, transmission, distribution and the theft thereof, besides other issues.
Construction 2015: A review of South Africa’s construction sector (PDF Report)
Creamer Media’s Construction 2015 Report examines South Africa’s construction industry over the past 12 months. The report provides insight into the business environment; the key participants in the sector; local construction demand; geographic diversification;...
Liquid Fuels 2014 - A review of South Africa's Liquid Fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2014 Report examines these issues, focusing on the business environment, oil and gas exploration, the country’s feedstock supplies, the development of South Africa’s biofuels industry, fuel pricing, competition in the sector, the...
Water 2014: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2014 report considers the aforementioned issues, not only in the South African context, but also in the African and global context, and examines the issues of water and sanitation, water quality and the demand for water, among others.
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
This Week's Magazine
Updated 5 hours ago Projected capital expenditure (capex) in the South African automotive assembly industry should reach a record R7.48-billion this year, says the National Association of Automobile Manufacturers of South Africa (Naamsa) in its 2014 fourth quarter business review. Capex...
Updated 5 hours ago After several years of navigating project-threatening red tape and currency fluctuations, the 4.4 MW Bronkhorstspruit biogas power plant, which will supply clean energy to a leading automotive manufacturer in Gauteng, is expected to enter production before June....
Updated 5 hours ago South African paper and pulp producer Sappi reported earlier this month that it would build a pilot plant for the production of low-cost Cellulose NanoFibrils, or CNF (nanocellulose) at the Brightlands Chemelot Campus in Sittard-Geleen in the Netherlands.
Updated 5 hours ago The long-term outlook for Nigeria is a country that has the potential to be very strong. So affirmed International Monetary Fund (IMF) Nigeria Mission Chief and Senior Resident Representative Dr Gene Leon on recently. "But we are starting from a point of huge...
Updated 5 hours ago Poor infrastructure planning and inadequate maintenance are becoming increasingly problematic for new developments and the associated infrastructure required to support such developments.