Ball sector valves

Ramén Ball Sector Valves are used as isolating and control valves for fluids, gases, turbid media and sludge, especially in the mining industry, pulp and paper industry and chemical industry. Abrasive slurries of iron ore, coal, lime and fly ash are also controlled with this type of valve.

Ramén Ball Sector Valve – Construction principle

Ramén Ball Sector Valve is made from a half ball sector which via two shafts is journal led in the valve body. One part of the ball sector sphere is used for shut-off. The other part does the regulation and has a hole with a diameter of about 80% of the nominal valve size. This is the optimal size to get excellent regulating characteristics.

The ball sector is turned through about 90° on operation from fully open to closed. The shape of the valve opening (flow area) is thereby changing from fully circular to elliptical. The circular opening reduces the risk of blockage and is less subject to wear in throttling position than the more slot-like flow in certain other types of control valves.

A versatile valve suitable for most control tasks

The valve characteristic maintains almost the same percentage value with constant differential pressure. The modified equal percentage operating characteristic (in operation, the differential pressure increases as the valve closes) combined with the outstanding rangeability of 300:1 mean that the valve can be used for most control tasks. The special connection of the valve body ensured that the differential pressure on the valve has little effect on the actuating torque.

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This model, a special execution of Ramén KS, is a tailored control valve for high temperature applications, especially for steam control. This is a modified version of KS-1B, designed to withstand temperatures as high as +250°C while maintaining the control precision and reliability. This is thanks to carefully selected materials such as stainless steel body, Stellited metal seat, hard chromed ball sector, high grade EPDM-90 O-ring and MP bearing.

This control valve assembly includes a high temperature pneumatic actuator in order to withstand the heat through radiation. This combination enables our valves to resist tough operability, maximizing the equipment uptime and minimizing the process unit downtime.

Basis weight control valve is a critical part in a paper machine operation controlling the the consistency of the pulp into the Head Box which dictates the paper weight and quality at the end of the process. To meet customers’ specifications, Ramén offers a reliable and highly accurate control solution which is a customized KS type valve in material execution 1A with a special ball-shaft connection to avoid backlash, suitable for the basis weight application. The high resolution controllability is enhanced by Oden backlash-free electric actuator with stepper motor controlled by a microprocessor.

The Ramén Ball Sector Valve in Titanium with a PTFE stuffing box is used to increase tightness to atmosphere with corrosive media. When throttling chemicals where the media is corrosive and higher grade of alloys are needed the Ramén Ball Sector Valve in Titanium is used.

The Ramén KSG Ball Sector Valve is a rubber lined control valve that offers extended resistance to wear in various industrial applications containing abrasive particles. All wetted parts (body, ball sector and the outlet protection ring) are lined with polyurethane (PUR) and natural rubber (NR), making particles bounce off rather than, in the case of using metal parts, cause substantial wearing.

Typical applications
• Cement mixture in silos and hoppers
• Sand pumping
• Crushers and seperators, slurry mixing
• Iron ore dressing plants
• Industrial and municipal waste

The Ramén Ball Sector Valve KSP is a stainless-steel control valve with an optional braided PTFE stuffing box packing that offers increased tightness to atmosphere. The Ramén KSP model offers a safe solution for processes in which elevated temperatures and/or corrosive and hazardous media put increased tightness requirements on the valve.

Typical applications
• Chemicals
• Steam
• Hydrocarbons
• Industrial gases
• Energy gases
• Industrial gases
• Hot oil