Flowserve Mach 1 - Manual (Page 7)

7
User Instructions Mach 1 High Performance Plug Valve - DVENIM0300-01 - 03.13
®
FIGURE V-A2
7. Place the metal diaphragm (Part 6) over the plug stem with the
raised center section up.
8. Place the thrust gland (Part 7) over the plug stem.
9. Apply a thin film of lubricant to the plug and place the assem-
bled plug (complete with PFA diaphragm, metal diaphragm and
thrust gland), in the open position into the body. (Figure V-A3).
FIGURE V-A3
10. Lay the top cap (Part 9) upside down (the bonnet gasket flange
upward). Hold the grounding spring (Part 8) so the tabs on the
spring ID point downward. Insert the grounding spring into the
top cap and push the grounding spring to the bottom of the
center cavity in the top cap. (Figure V-A4).
FIGURE V-A4
SECTION V
11. Turn the top cap to the right side up position and place the
top cap (with grounding spring in place) over the plug
stem. Orient the top cap anti-rotation lugs with the anti-
rotation lugs on the body (Figure V-A5).
FIGURE V-A5
12. Coat the top cap fastener threads (Part 10) with Loctite®
242. Replace the tags removed in step 7 of Section III,
Valve Disassembly. Install the top cap fasteners in the top
cap.
13. Use an arbor press to push the top of the plug downward
until the bottom of the plug port aligns with the bottom of
the body port.
14. Maintain the top cap position relative to the body anti-
rotation lugs (Figure V-A5), and using all top cap fasteners
(Part 10), tighten evenly in a cross-cross method until the
top cap bottoms on the body counterbore. (Figure V-A5).
Tighten top cap fasteners to the value per valve size and
pressure class as listed in Tables V-A-II, V-A-III and V-A-IV.
15. Remove the valve from the arbor press. Operate the plug
several times. Torque will be high, but will reduce and the
plug will turn freely.
16. Install adjuster fasteners (Part 11) (Figure V-A6) and hand
tighten evenly to the values listed in Table V-A-V or until
the bottom of the plug port is 1/16" to 1/8" above the bot-
tom of the body port.
FIGURE V-A6