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.
The Ramén Ball Sector Valve in material configuration 1 is a stainless steel, soft seated control valve with a carbon/graphite reinforced PTFE seat with Viton® (FKM) o-ring seals and a media protected shaft bearing of modified PTFE, Rulon®. KS-1 is used in industrial applications for clean and non-abrasive liquid or gas at moderate pressure, pressure drop and temperature. This product is made by Ramén Valves in Sweden. Certified according to fugitive emission standards ISO-15848-1 and VDI 2440 (TA-luft).
Typical applications
•Clean and non-abrasive liquids
•Clean water, oil and non-abrasive suspensions
•Gases and vapors
•Nitrogen (N2), oxygen (O2), natural gas, air etc.
The Ramén Ball Sector Control Valve in material configuration 1A is a stainless steel, soft seated control valve with a carbon/graphite reinforced PTFE seat ring and a hard chrome coated ball sector. KS-1A is recommended when media is slightly contaminated liquids, slurries or dry powder and where shut off tightness is required. Certified according to fugitive emission standards ISO-15848-1 and VDI 2440 (TA-luft).
Typical applications
• Fibre suspensions
• Condensate
• Waste water
• Chemicals
• Bio gas
• Tank bottom valve
The Ramén Ball Sector Control Valve in material configuration 1B is a stainless steel control valve with a Stellite metal seat and hard chromed ball sector. KS-1B is used when handling abrasive media at moderate pressure and temperature. This configuration is also used for elevated velocity or pressure drop. Certified according to fugitive emission standards ISO-15848-1 and VDI 2440 (TA-luft).
Typical applications
• Slurries
• Liqour (Green, white & black)
• Low pressure steam
• Chemicals
• Water & waste water
• Process water
The Ramén Ball Sector Control Valve in material configuration 1C is a stainless steel control valve with a Stellite metal seat and hard chrome coated ball sector and seat holding ring. KS-1C is used for abrasive media at moderate pressure or pressure drop. KS-1C is also well suited for applications with elevated velocity or pressure drop and with incipient cavitation. Certified according to fugitive emission standards ISO-15848-1 and VDI 2440 (TA-luft).
Typical applications
• Slurries
• Liqour (Green, white & black)
• Low pressure steam
• Chemicals
• Water & waste water
• Process water
The Ramén Ball Sector Control Valve in material configuration 1E is a stainless steel control valve with a deep Stellite metal seat and a hard chromed ball sector.
KS-1E is used for abrasive media at moderate pressure or pressure drop. This valve configuration is also used for elevated velocity, temperature and pressure drop which gives a risk for cavitation to occur. Certified according to fugitive emission standards ISO-15848-1 and VDI 2440 (TA-luft).
Typical applications
• Slurries
• Liqour (Green, white & black)
• Low pressure steam
• Chemicals
• Water & waste water
• Process water