Flowserve Edward Cast Steel Bolted Bonnet Valves - Manual (Page 3)

3
Flow Control Division
Edward Valves
Introduction and Service Problems
Introduction
Cast Steel Bolted Bonnet
This manual has been prepared to serve as
a guide for the maintenance of Edward
bolted bonnet valve construction. It is
designed to help you in obtaining the most
satisfactory service from these valves.
Although rigid metallurgical, radiographic,
physical and visual inspection is the stan-
dard procedure for all Edward products, it
is inevitable that some valves, after a
period of time, may occasionally require
repair. When this happens, this manual
will assist you so that your valve may be
satisfactorily restored to good working
condition with a minimum of time and
expense.
Before starting, it will be helpful to have
some understanding of the valve’s physical
construction. The drawing on pg. 5 will
give you some idea of how the valve is put
together.
The next major section of this manual dis-
cusses the more common service problems
and failures. It identifies the problem and
explains the reasons for certain failures.
The reason should be understood before
work is actually started.
Then the procedure to be followed in mak-
ing the repair is explained. This includes
normal valve maintenance as well as major
valve repair. Field repair equipment, avail-
able from Edward Valves, is described and
illustrated. Valve lubrication and welding
rod recommendations are also made. These
procedures are adequate for almost any
valve repair or maintenance problem that
may arise in the field.
The next major section describes the disas-
sembly procedures for the various valve
components.
It is very important that the Introduction
and the paragraphs titled “First Determine
the Area of Failure” be read and under-
stood before any disassembly work is
begun. Several procedures are described,
depending upon the area of failure.
Considerable time can often be saved by
first selecting the proper disassembly
procedures.
The last major section explains how the
various valve constructions are to be
reassembled. Information on how to
contact Edward Valves for additional
advice, if required, and how to order
parts is included.
FIGURE NUMBER OF EDWARD
BOLTED BONNET VALVES
DESCRIBED IN THIS MANUAL
302 329Y 605Y 1324
302Y 390 618 1324Y
303 390Y 618Y 1390
303Y 391 619 1390Y
304 391Y 619Y 1392
304Y 392 670Y 1392Y
318 392Y 690 1441
318Y 393 690Y 1441Y
319 393Y 691 1443
319Y 394 691Y 1443Y
328 394Y 1302 1641
328Y 604 1302Y 1641Y
329 604Y 1314 1643
605 1314Y 1643Y
SERVICE PROBLEMS
Packing Chamber Leak
Where moisture appears or actual dripping
occurs at the packing chamber around the
stem, gland or gland flange which cannot
be eliminated by re-torquing the gland bolt
the following points should be considered.
1. The packing may have become hard.
Replace the packing.
2. Gland travel has been fully taken up.
Repack with new packing.
3. The wrong packing is being used.
See packing recommendations shown
on this page.
4. A stem should be replaced when it
has become deeply scratched,
burred, or otherwise mutilated from
careless handling, or where the stem
has worn, tapered or has been bent.
5. The gaps in the rings of split packing
have not been staggered around the
stem. They should be inserted in this
manner.
6. The packing gland may be binding
against the packing chamber or stem
and does not compress the packing
properly. Make certain the gland fits
the packing chamber and is tight-
ened down equally on each side.
Packing Recommendations
Edward valves are packed with all-purpose
packing sets. This is a combination of
packing using braided rings at the top and
bottom of the packing chamber and flexi-
ble graphite packing in the center section.
Packing glands should be tightened down