Valve Cage Repairing: An Example Of MWH's Service To The Customer

—Literature Offered— Valve cages, whether watercooled or uncooled, may have some inherent weaknesses which can lead to serious defects after some thousand running hours. The sensitive spots are the cooling channels, weld area, seat coating and the anti-corrosion coating.

The damaged areas can be repaired economically in the factory and, according to Markisches Werk Halver (MWH), customers are delighted about the quality of the reconditoned cages, and about the fact that they are more cost effective than new replacement cages.

MWH offers a valve reconditioning service which is able to deal with nearly all types of cages, irrespective of whether these were originally manufactured by MWH.

First of all, the valve cages are checked completely in order to determine whether an economic repair can be effected, and to ensure that after repair the valve cages will operate for the designed period.

Thereafter, some or all of the following work will be carried out, depending on the actual condition of each valve cage: seat repair with new armor coating followed by ultrasonic testing; reapplying the anticorrosive coating; cleaning of the cooling channels; pressure testing of the cooling chamber, repairing if necessary; checking of the valve guides, replacing if necessary.

One of the critical points of the repair work is the perfect matching of the valve head seat angle to the cage seat. This precision work can only be carried out on modern machinery in the workshop.

At the end of the reconditioning, each cage is submitted to the same control procedure as a new one. In this way customers can be sure that all cages reconditioned by MWH fully comply with their requirements.

In order to provide a quick service, MWH is in a position to supply reconditioned cages on an exchange basis.

For further information and free literature from MWH, Circle 20 on Reader Service Card

Maritime Reporter Magazine, page 10,  Feb 1989

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.