夹布橡胶密封圈-James walker Solosele KB Hydro special duty seal
Solosele KB Hydro is an innovative product developed specifically to
seal the blade roots of Kaplan water turbines. This profiled elastomeric seal is reinforced at the base with an integral anti-extrusion element of rubber-proofed fabric that is securely mould-bonded to the lip portion. The anti-extrusion element is sufficiently tough to stop the seal from ‘stretching and bunching’ when the shaft rotates, yet is remarkably flexible for ease of fitting.
Typical applications
Solosele KB Hydro has operated with great success for many years on the blade roots of Kaplan water turbines at hydroelectric schemes across the world — both as an OEM fit and as retrofit on older equipment. It has out-performed and run significantly
longer than many multi-lip seals and other types at these sites.
Installation
Solosele KB Hydro does not need axial compression, therefore housing length
tolerances can be relaxed and installation becomes a very simple procedure. This is
particularly valuable to OEMs when fitting endless-type seals during plant assembly.
Special features
• Proves very cost effective.
• Excellent sealing capability under fluctuating conditions.
• Does not require adjustment to axial compressions to cater for offset caused
by bearing wear.
• Works in a back-to-back arrangement to keep oil in and water out.
• Efficiently seals shafts that run eccentrically on worn bearings.
• Easy to retrofit using our special OSJ (On-Site Joining) method.
• Significantly reduces turbine downtime and maintenance costs.
• Design is based on our highly successful Solosele G single element
seal (see pages 12-13), widely renowned for its compact, robust construction and high integrity sealing under difficult mechanical conditions.
Operation
A Solosele KB Hydro sealing arrangement typically comprises two seals fitted
back-to-back in the blade root housing.
This keeps lubricant in the system and prevents the ingress of water and abrasive
particles. When the seal is installed in its housing, the radial squeeze on its elastomeric body provides low pressure sealing suitable for stationary and turbine start-up conditions. As system pressure rises, the seal responds accordingly to maintain a constant sealing force through fluctuating and reversing pressure differentials (including negative pressure) between the oil and water. In addition, the seal’s highly developed profile enables it to overcome high levels of eccentricity or shaft offset caused by bearing wear at the blade root.
