Boiler feed water valves

August 2012 Valves, Actuators & Pump Control

As with many valves on a boiler, feed water valves experience very different conditions during start-up compared with normal operational running. Not only are flow rates lower, but the pressure drop is usually much greater. This results in cavitation and flashing damage close to the seat, as well as poor control.

PSV Mitech has developed a control valve with a special trim to handle both conditions. At the bottom of the retainer are a series of restrictions that eliminate cavitation by gradually dropping the pressure. This is the ZZ design. As the plug opens, the flow then passes through passageways with a smaller number of restrictions. In the top half of the retainer are single hole restrictions which can handle the high flow low pressure drop condition that the valve experiences in normal running mode. This type of trim gives turndown ratios of up to 200:1. The valves are 50, 80 and 100 mm in size and rated to ANSI 2500#.

For more information contact Greg Walker, PSV Mitech, +27 (0)11 657 6000, [email protected], www.mitech.co.za

Further reading:

Hygienic processing with butterfly valves and Bürkert control technology
Bürkert South Africa Valves, Actuators & Pump Control
Among the standout technologies shaping modern hygienic processing environments are hygienic butterfly valves, especially when seamlessly integrated with Bürkert actuators, control tops and positioners.

Read more...

---

Cryogenic valve limits leakage and energy loss
Valves, Actuators & Pump Control
Emerson has introduced the Fisher IC2 cryogenic top-entry control valve, ideal for cold box applications in air separation units, hydrogen liquefaction and LNG production.

Read more...

---

Internationally engineered valves support uptime in tough conditions
Bearing Man Group t/a BMG Valves, Actuators & Pump Control
BMG’s Fluid Technology division works closely with industry in sub-Saharan Africa to ensure that all valves, strainers and flow control equipment supplied meet the exact requirements of every application and also conform with stringent industry standards.

Read more...

---

Allmech introduces new water treatment solutions
Valves, Actuators & Pump Control
Allmech has announced a series of product updates aimed at improving reliability, efficiency and system simplicity in high-volume and high-hardness water environments.

Read more...

---

Duplex valve improves continuous production at Gauteng manufacturing facility
Valves, Actuators & Pump Control
In a recent installation at a Gauteng-based manufacturer of household and personal care products, Allmech provided a tailored water treatment solution to ensure a consistent supply of soft water for steam generation, an essential element in the client’s 24/7 production cycle.

Read more...

---

Developing solutions for SA’s wastewater challenges
Valves, Actuators & Pump Control
KSB Pumps has a proud global legacy in the development of self-priming pump technology, which reflects decades of engineering innovation and application expertise. Building on this foundation, KSB’s AU series has extended the company’s self-priming expertise into screened wastewater handling, which meets the growing needs of municipal and industrial sectors worldwide.

Read more...

---

Helping to solve wastewater challenges
Valves, Actuators & Pump Control
KSB Pumps and Valves is doubling its efforts to help government and municipalities find practical and technical solutions to the growing wastewater challenges gripping large parts of the country.

Read more...

---

Ultra-durable stainless steel submersible pumps
Valves, Actuators & Pump Control
KSB Pumps and Valves has launched a rugged stainless-steel submersible pump range designed for deep borehole use and other demanding freshwater and saline pumping applications.

Read more...

---

Industrial valve solutions
Bearing Man Group t/a BMG Valves, Actuators & Pump Control
BMG’s Fluid Technology division supplies and supports an extensive range of components for fluid technology systems. These include valves, hydraulic hoses and fittings, accumulators, cylinders, heat exchangers, hydraulic motors and hydraulic plumbing, as well as pumps and reservoir accessories.

Read more...

---

New wastewater pump for local municipalities and industries
Valves, Actuators & Pump Control
The latest wastewater pump from KSB Pumps and Valves is making waves in the industry due to a host of new features that provide users with an ultra-durable long service pump with fewer blockages and a lower maintenance requirement than traditional pumps.

Read more...

---