Valve Modification Achieves Four-Year Milestone
Furmanite’s modification of a DN 1400 Mapag butterfly valve in 2010 passed its four-year inspection and will now be implemented for use worldwide by a large industrial gas supplier.
In 2010, a Furmanite team dismantled, cleaned and resolved a problem with the guides from the valve. It was severely corroded on the inside of the delivery valves and the housing of the liver was completely corroded. The livers were replaced with sinter self-lubricating bronze. This material was chosen because the bearing mounted on the inside of the valve seating cannot be reached during operation.
Two bearings were placed on either side of the valve, which act as a guide for the spindle. Both bearings have a bronze inner work on either side in which a grease chamber is arranged so that the shaft is on the outside where it can be lubricated. In addition, the bearing bushes are both on the outside and inside provided with an O-ring in order to prevent penetration of moisture.
By all indications, the team considers this modification long-term improvement.