Flowserve Marathon-Mach 1 - Manual (Page 3)

3
Flow Control Division
Section 1.0
FIGURE II-1
Typical Assembly of Marathon-Mach 1 Valve
SECTION II
OPERATING/MAINTENANCE INSTRUCTIONS FOR MARATHON-MACH 1
Maintenance requirements for Marathon-Mach 1 valves may
vary due to operating conditions of the process. Factors such
as operating temperature, pressure, solids content, and
frequency of cycling can influence valve performance and
maintenance requirements.
Seal wear is compensated by adjusting appropriate parts. For
Mach 1 valves, there are three possible leak paths:
1. Top Cap (bonnet)
2. Stem
3. Line (through)
Corresponding adjustments for each leak path are as follows.
NOTE: Refer to Figure II-1 for parts identification.
1. Top Cap (bonnet)
Leakage due to thermal or pressure cycling is eliminated by
tightening the top cap fasteners (Part 10) in a “criss-cross”
pattern to the torque values given in the tables. This adjust-
ment is most effective when the valve is not pressurized.
It is important that the top cap fasteners not be tightened
excessively and that torque values applied be within
industry standard for fasteners.
2. Stem
Leakage due to wear of the diaphragm, and/or wear to
the sleeve (primary seal) is eliminated by tightening the
adjuster fasteners (Part 11) in 1/4 turn increments. The
adjuster fasteners must be tightened evenly for maximum
adjustment. The valve should be operated between adjust-
ments to assure that the plug properly seats itself into the
sleeve. If leakage persists after repeated adjustments, the
sleeve and diaphragm will require replacement as covered
in Section V and Section VI.
3. Line (through)
Through leakage due to wear of the primary seal can be
eliminated by tightening the adjuster fasteners (Part 11)
in 1/4 turn increments. The fasteners must be tightened
evenly for maximum adjustment. The valve should be oper-
ated during adjustments to prevent excessive operating
torque. Should leakage persist after repeated adjustments,
the port seals or sleeve will require replacement as covered
in Section V and Section VI.
To avoid personal injury and prevent damage to equipment, do
not operate or repair this valve without observing the following
procedures outlined in this manual.