Flowserve Marathon-Mach 1 - Manual (Page 8)

8
Flow Control Division
Section 1.0
SECTION V
16. Tighten the adjuster fasteners (Part 11) until a reasonable
plug stem turning torque is obtained (Ref. Table V-A-V). The
height of the plug port should be positioned approximately
1/16" above to flush with the body port. Examples:
1" Valve = 8 ft·lb, 3" Valve = 20 ft·lb, 6" Valve = 100 ft·lb.
17. Place the locking stop (Part 12) on the top cap as shown
in Figure V-A-5 and tighten the locking stop fasteners
(Part 13) to a reasonable torque. Check their orientation
based on the location marks made during disassembly
(Section III, step 1).
18. Place the stop collar (Part 14) and retainer (Part 15)
on the plug stem as shown in Figure V-A-6. The stop
collar should point in the direction of the flow. Check the
orientation based on the location marks made during
disassembly (Section III, step 1). Proper rotation is
clockwise to close.
19. The valve should turn clockwise to close. The valve is now
ready for test and use.
20. LEAK TESTING: Anytime a valve has been modified in
any manner, including fastener changes, it must be
re-tested. Normal testing, using gas, should be at 80 PSI
for Class 150 through Class 600. Refer to API or MSS for
test procedures complying with these specifications.
FIGURE V-A-5
FIGURE V-A-6
TABLE V-A-II
*Apply Loctite ® 242 to fastener threads, top cap only.
TORQUE REQUIRED ON TOP CAP FASTENERS OF CLASS 150 MACH 1 VALVES
VALVE SIZE 1" 1.5" 2" 3" 4" 6"
MAX. TORQUE (ft-lbs) 10 10 15 28 40 80
TABLE V-A-III
*Apply Loctite ® 242 to fastener threads, top cap only.
TORQUE REQUIRED ON TOP CAP FASTENERS OF CLASS 300 MACH 1 VALVES
VALVE SIZE 1" 1.5" 2" 3" 4" 6"
MAX. TORQUE (ft-lbs) 12 12 22 35 62 115
TABLE V-A-IV
*Apply Loctite ® 242 to fastener threads, top cap only.
TORQUE REQUIRED ON TOP CAP FASTENERS OF CLASS 600 MACH 1 VALVES
VALVE SIZE 1" 1.5" 2" 3" 4" 6"
MAX. TORQUE (ft-lbs) 14 20 35 45 42 70
TABLE V-A-V
TORQUE ON PLUG ADJUSTER OF MACH 1 VALVES, 150#, 300# AND 600#
VALVE SIZE 1" 1.5" 2" 3" 4" 6"
MAX. TORQUE (in-lbs) 35 35 35 50 75 150