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94<br />
Reheater Isolating Device<br />
Sizes 16” – 36”<br />
ASME B16.34 – 1996<br />
Valve overall lengths to<br />
ASME B16.10 – 1992<br />
Pressure Class: 500, 900<br />
Features & Benefits<br />
Excellent Reliability<br />
● Minimal parts with full bore seat for optimum<br />
performance and low pressure drop<br />
● Simple Isolating closure with one jacking stud<br />
Low Cost Maintenance<br />
● Pressure seal bonnet design gives maximum reliability<br />
with minimum maintenance<br />
● No replacement parts required (other than pressure<br />
seal)<br />
Improved Performance<br />
● Low cost isolating device<br />
● Simple method of isolation with full bore, low<br />
pressure drop<br />
● Ability to enter pipe system through cover for steam<br />
purge (chemical clean)<br />
1<br />
2<br />
3<br />
4<br />
5<br />
High Integrity Pressure Seal. The greater the<br />
force under the bonnet, the tighter the seal<br />
becomes at the body/bonnet joint.<br />
Light weight and resilient the pressure seal ring<br />
is made of exfoilated graphite. The pressure<br />
seal ring is retained in a cavity and under<br />
pressure expands radially. During field<br />
maintenance replacement of the pressure seal<br />
ring, or lapping of the pressure seal area is<br />
unnecessary. The need for an inlay or hone<br />
finish has been eliminated.<br />
High Integrity Seal Closure. The high integrity<br />
seal offers positive closing and zero leak for<br />
hydrotest. This high integrity seal allows for<br />
nitrogen layup and gas padding so a system<br />
may be charged with gas to eliminate<br />
corrosion. Once the seal has been placed in the<br />
position, the tightening of one unobstructed<br />
jacking stud gives a positively closed “zero<br />
leakage” seat seal.<br />
Top entry design. The Dewrance Reheat<br />
Isolator valve simplifies maintenance. It is not<br />
necessary to cut the valve out of line. There are<br />
no welds to break and cutting is eliminated.<br />
The top cover and bonnet are held to the body<br />
of the valve by means of jacking studs that<br />
firmly seal the bonnet against the flexible seal<br />
ring which is held in place by a segmented<br />
removable retaining ring.<br />
Low Pressure Drop. Once the isolator body is<br />
installed, it literally becomes part of the piping<br />
system. The straight in-line design allows a<br />
smooth, in-line flow with unobstructed<br />
passage. Pressure drop is therefore held to an<br />
absolute minimum.<br />
A chemical cleaning connection as an optional<br />
extra.<br />
Reheater Isolating Device<br />
1<br />
2<br />
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4<br />
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