TITLE:
NO.:
KEROTEST MODEL-1
REV.: E
GATE VALVE BONNET LEAK
DATE: 7/12/07
REPAIR PROCEDURE
PAGE: 4 OF 13
This report is the property of Kerotest Manufacturing Corp. 5500 Second Avenue, Pittsburgh, PA 15207 and may not be
copied by any means without the expressed written consent of Kerotest. It is intended for the sole purpose of helping
Kerotest customers evaluate Kerotest products and may not be released to any third party or otherwise used in any
manner injurious to the interests of Kerotest.
For valve sizes 2" – 6" it is strongly recommended that support clamps be used during bolt
replacement. These clamps are available from Kerotest (Part Number 72544794 for 2"
and 3" valve sizes and Part Number 72544802 for 4" and 6" valve sizes). Support clamps
are not required on 8" and larger valve sizes. Aside from this, follow the instructions in this
procedure for valve sizes 8" and larger. If using these clamps, initially place one (1) in
between the two bolts that are closest to the leak location. Another clamp should be
placed on a diametrically opposite location on the cover. See sketch below.
Replace bolts on either side of both clamps. Then move both clamps in between the next
two bolts to be replaced. Remember to always keep both clamps diametrically opposite of
each other.
During bolt replacement tighten bolts to torque listed in Enclosure 2.
4. If after replacing existing bonnet bolts leakage continues at an unacceptable level, the
following procedure may be used for valve sizes 2" and larger. This procedure must only
be performed by Kerotest Factory Trained Personnel.
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