Leslie Controls CONTROL VALVES SINGLE PORTED DOS - Manual (Page 6)

6
Figure 5 - Use of Seat Ring Wrenches to
Remove or Install Seat Rings
To Install Seat Ring(s)/Inserts
1.
Carefully clean threads and joint contact
surfaces on seat ring(s) and in valve body.
2.
Make sure joint surfaces are undamaged.
3.
Screw seat ring into valve body threads and
pull up tight with wrench.
4. Tap end of seat ring wrench bar with
hammer to lock seat ring in place.
Inspection, Cleaning, Reworking
or Replacement of Parts
Inspect all parts, including valve plug and seat
ring/insert(s). Replace any excessively worn or
damaged part(s). Do not remove threaded type
seat ring(s) from valve body unless necessary to
replace.
Ordering Parts
Order parts from the proper drawing. Give valve
type, size, press class and part(s) reference
number(s) or part name, valve code number and
serial number.
Cleaning
Clean all parts thoroughly with an approved,
non-residue forming solvent. Remove encrusted
material with crocus cloth or very mild
aluminum oxide cloth. For parts repair
information,
consult your local Leslie
Representative.
All Leslie control valves are made of the finest
material obtainable, time-tested and backed by
over 100 years of know-how. Machining is done
by an expert craftsmen and each valve is
inspected and service tested before shipment to
you.
Use of other than genuine Leslie parts may
impair their ability to serve you. Leslie parts are
held to very close tolerance to eliminate field
machining and grinding on valve and seat
ring/inserts or reaming on (valve plug guide
bushings).
Lapping in Valve Plug and Seat
Ring(s)/Insert
Apply superfine lapping compound to valve
seating surface and assemble valve plug and
bonnet to valve plug body as shown in figure 6.
Lap in until a fine continuous ring of contact has
been made on both surfaces. Do not lap until a
ridge is formed. (see Fig. 6)
Figure 6 - Main Body Sub-Assembly
1. Bonnet acts as guide when grinding valve
plug.
2.
Loosen packing flange studs/bolts slightly if
packing is installed.
3.
Uses wrench on flats of valve plug stem for
turning valve plug. Do not bear down on