TITLE:
NO.:
KEROTEST MODEL-1
REV.: E
GATE VALVE BONNET LEAK
DATE: 7/12/07
REPAIR PROCEDURE
PAGE: 7 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
.
ENCLOSURE 1
BROKEN BOLT REMOVAL
If bolt is not broken below the top of cover flange shown below, a small chisel or punch could
be used to try and extract the bolt.
When bolt is broken down below the flange, an easy out must be used to extract it. If
available, a left handed drill bit will sometimes remove the bolt during drilling.
The center of these bolts are softer than the outer threaded edges. A sharp drill bit will easily
penetrate the bolt with or without cutting oil. Cutting oil is preferred because it reduces the
likelihood of sparks occurring during drilling.
A good quality center punch will be needed. Bolts should be punched and drilled as close to
the center of the bolt as possible.
Kerotest offers a Model-1 Bolt Repair Tool Kit, Part Number 72631146. This kit includes all
necessary punches, drill bits and easy-outs for removing cover bolts on valve sizes 1-1/4"
through 8".
