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Maintenance
(CONTINUED)
whereby a potential hazard could result. A maintenance programme should therefore include
checks on the development of unforeseen conditions, which could lead to failure.
The Fig.370/371 valve drain taps should not normally require any maintenance. However these
drain taps can be refurbished by fitting a new elastomeric seat washer and stem seal.
Valve seal replacement
During this maintenance exercise the valve necessitates a complete system drain down.
1.
Remove the drain tap from the system.
2.
Position the drain tap in a suitable vice, gripping via the hexagon at the threaded end.
3.
Remove the stem-retaining sleeve (lockshield) in an anti-clockwise rotation.
4.
Remove the stem in an anti-clockwise rotation.
5.
Slacken and remove disk seal nut and disk seal. Gripping the stem Drive Square will assist
this operation.
6.
Fit a new disk seal and refit the disk seal nut and peen thread to prevent loosening.
7.
Fit new 'O' ring seal to the stem.
8.
Refit stem and disk assembly into the valve body in a clockwise rotation to the closed
position.
9.
Refit the stem-retaining sleeve (lockshield) in a clockwise rotation and tighten.
10.
Operate the valve to confirm suitable operation.
11.
Refit the valve to the system, close valve and pressurize checking for leakage.
For the supply of genuine Hattersley spares or technical assistance contact:
Hattersley Newman Hender
Peel House, Peel Road, West Pimbo, Skelmersdale, Lancashire, WN8 9PT
T:
01695 712800
| Fax:
EPSILON TERRACE, WEST ROAD,
IPSWICH, SUFFOLK, IP3 9FJ
HOME SALES: +44 (0)1473 277410
EXPORT SALES: +44 (0)1473 277450
UK SALES ENQUIRES: uksales@hattersley.com
EXPORT SALES ENQUIRES: Mena-enquiries@hattersley.com
TECHNICAL ENQUIRES: tech-enquiries@hattersley.com
www.hattersley.com
www.cranebsu.com
01695 712820
| E:
To visit our Video Library go to:
www.youtube.com/user/CraneBSU
uksales@hattersley.com export@hattersley.com
FM311 ISO 9001
•
Approved to BS EN 331: 1998
•
Designed and manufactured under quality management
systems in accordance with BS EN ISO 9001:2008
Every effort has been made to ensure that the information contained
in this publication is accurate at the time of publishing. Crane Ltd
assumes no responsibility or liability for typographical errors or
omissions or for any misinterpretation of the information within the
publication and reserves the right to change without notice.
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