Table of Contents
Advertisement
(3) Main diaphragm
1. Remove pipe C [36] at tee [33].
2. Remove bolt [41] of bottom dia. case [5]. Dismount the bottom dia. case, main
diaphragm [12], retainer [11], and spindle [9] (adapter [52] and retainer [11] for nominal
sizes 65A to 100 A).
7.4 Precautions for disassembly
Caution
(1) Check that there is no damage and scratches on the main valve, main valve seat, pilot
valve, and pilot valve seat.
* Any scratches at sealing surface lead to increase in secondary pressure. When any
scratches are identified at main valve and seat, polish them away. And, change the parts
if scratches still exist after polishing. Also, in case any scratches are identified at pilot
valve and pilot valve seat, change into pilot valve assembly.
(2) Move the sliding section (pilot valve, piston, etc.) two to three times and confirm they move
smoothly.
* If the sliding parts do not move correctly, it may cause failure problems. (Working not
correctly).
(3) Replace gaskets with new ones when reassembling.
* If the gasket is used for a long time, it may cause steam leakage problem.
(4) Assemble in the reverse order of Disassembly. And tighten the bolts evenly.
* Assemble the valve due to the order. Failure to do so may lead to not assemble correctly.
And if the hexagon bolts are not screwed correctly, it may cause steam leakage problem.
-17-
■EPDT-098a■
Advertisement
Table of Contents
