Rotary Coal Valve (HLT)

An international steel producer experienced failures twice a year on a bearing in a rotary coal valve at an ore preparation plant, causing significant production loss and damage to related components. The assessment determined that the existing bearing design was not adequate for the high temperatures. NSK recommended a special HLT bearing inside a Self-Lube cast iron FC housing together with a dedicated thermal insulation washer. The fitted bearings ran for more than 12 months without a single failure.

• Rotary coal valve — 1 machine; approx. 6 months service life
• Bearing failure due to high temperature; incorrect lubrication quantity and frequency
• NSK solution: special HLT bearing in Self-Lube cast iron FC housing with custom adapter plate
• Additional washer made of heat-resistant material
• Changes to lubrication quantity and intervals recommended
• Extended bearing life eliminated production loss costs

Technical Features: RHP HLT Self-Lube Bearing + Thermal Insulation Washer

• Special internal geometry; C5 internal clearance
• High-performance Klüber grease
• Durable silicone rubber seal; steel cage material
• Interchangeable with standard Self-Lube housings
• High-performance, effective lubrication between −40°C and +180°C
• Efficient insulation and protection at very high temperatures
• Increased radial clearance (C5) to help prevent radial preload