Valves, Actuators & Pump Control


Rubber lined ball sector valves

August 2015 Valves, Actuators & Pump Control

Controlling abrasive fluids is known to be a challenge for any industrial application. All valve technologies have pros and cons, and they need to be evaluated in the light of the media to be controlled. The main ratios to be taken into account are purchase cost, installation cost and most importantly when it comes to abrasive media; the cost for maintanance.

Ramén’s KSG is a rubber lined valve that offers extended resistance to wear and tear in the valve for slurries, gravel, powder, iron ore and other highly abrasive media. The natural rubber design, applied on the ball sector and in the valve house gives a valve with very long life time in any situation with maintained throttling and isolating characteristics. The KSG was developed in the beginning of the 1970s together with mining companies in Sweden. When a high end control or a long life isolating valve is needed for tough media the Ramén KSG valve can be used in wafer and flanged design.

Challenge

Prior to the development and use of rubber lined valves, the standard solution found in mining operations handling abrasive media were stainless steel or iron cast valves. This proved to be an inefficient solution, both technically as well as financially. To provide an example Ramén, at several occasions in mining operations, installed a standard stainless steel ball sector valve type KS size 150 mm, with hard chromium faced ball sector and stellite inlet cover ring and seat ring. When inspecting the valves approximately 40 days after the installation, water leaked through the body. The water was leaking through a hole just in the middle of the body and additionally, the inlet cover ring, ball sector and seat ring were badly worn.

Application 1: Iron ore dressing plant

Throttling of deposit from thickener:

• Flow 120-240 m³/h with 10–30% solids.

• Grain size about 1 mm.

• Inlet pressure – 0,8 bar.

• Pressure drop 0.8 bar.

Measures and results

Soft natural rubber is, in certain cases, much more resistant than steel. A soft rubber lined size 150 mm was installed in exactly the same application.

The valve was then taken out for inspection after 6 months (after 4 months continuous service), and absolutely no damage from wear was observed. Several other valve technologies had been tested e.g. rubber pinch valve, lined butterfly valves etc. in the same service and none had lasted more than about 2 months.

Application 2

Throttling control of water to magnetic separator where iron is separated from granite.

• Flow 90 m³/h with 12–15 g solids/litre.

• Inlet pressure – 2 bar.

• Pressure drop 2 bar.

Measures and results

Two years after installation the KSG rubber lined valve was taken out of service. The rubber was beginning to come loose from the sector but the valve was in very good condition. Experiences has established the KSG valve design as the preferred valve technology in severe services and replaced other valve technologies e.g pinch valves.

Conclusions

Since the development of the Ball Sector Valves in 1968 and the KSG in 1973 Ramén Ball Sector Valves have been used successfully in thousands of installations in mining and other industries for controlling abrasive media with outstanding ratios for purchase cost, installation cost and mostly important, the costs for maintenance and replacements.



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