Rotary Valve | Rotary Floating Shoe Valve RFS250Get latest price

Rotary Valve | Rotary Floating Shoe Valve RFS250

Rotary Floating Shoe or RFS Valves form an important part of the Ansac range of materials handling valves. RFS Valves are rotary valves specifically designed for high wear applications. The valves can be used in both positive and negative pressure applications and consist of a main body with bolt-on side plates and a rotating, webbed rotor located in between.

In most cases the Ansac Rotary Floating Shoe Series Valve offers up to 4 times the life of a standard Rotary valve offering unparalleled value for high wearing products such as Alumina, iron ore, cement, coal, fly-ash and mineral sands.

To achieve 100% positive sealing, the Ansac RFS Series Valve has a 'floating shoe' which slides tightly into the main body top port flange and rides onto the rotor by gravity force. The shoe slide is sealed with a double 'O' ring between the shoe and the main body, and where the shoe rides on the rotor, the contact surface between the two parts forms a mechanical seal.

The long service life that distinguishes Ansac RFS valves from all other valves in the market is achieved through the ceramic tips embedded in all leading surfaces of the blades and end plates of the rotor. The Ansac RFS Series also feature a sacrificial, hardened SG iron adjustable shoe. The shoe, which sits on the rotor, has up to 10mm of wear and can be adjusted externally while in operation to maintain minimal clearance at all times.

RFS series valves are designed to require very little maintenance over their service life. Ansac can offer an overhaul service for customers in which out of service RFS valves can be returned and re-conditioned for return to the client. This minimises the spare parts inventory required by the customer as well as the on-site training required. For customers who rather carry out their own maintenance Ansac stocks a comprehensive range of spares available for quick turnaround.

Shaft sealing

• Ansac Standard
  
  • Triple labyrinth ‘Zed Seals’ fitted with flock pads, and greased on each side of the valve, are standard with all RFS valves.
    
• Purge Sealing
  
  • Grease Purge - For extreme duty, valves can be fitted with a grease purge unit over the labyrinth seal. By creating a grease filled cavity between the seals, it prevents the escape of any dust particles or gases.
    
  • Air Purge - When grease cannot be used, air or other gases can be used to purge the seal so all dust particles or product gases are flushed back into the product stream.

Proximity sensors

Under speed sensors can be supplied and fitted to RFS valves. These are mounted on a specifically designed bracket that is bolted onto the bearing. The sensor fitted is 12mm in diameter with CD-PNP electrical connection and protection to IP67. The unit is suitable for temperatures from -25°C to +70°C.