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Anderson Greenwood SerieS 9300 Pilot oPerated Safety relief ValVeS
InstallatIon and MaIntenance InstructIons
2.4 Main valve seat disassembly and
replacement (bolted) (refer to figure 4, detail
d, and figure 5, detail e)
1. to assist in seat plate disassembly, partially
thread the seat plate assembly into the
fixture which consists of a 6" long hexagon
bar with a ½" x 13 x 1" deep threaded hole in
one end, and a
" x 18 x 1" deep threaded
/
5
16
hole in the other end.
note: the
" hole is for valves sizes
5
/
16
2" through 6" and the ½" hole is for 8"
through 12".
2. With the seat plate assembly threaded into
the fixture, secure the fixture into a vise and
remove the seat screws (120) by holding
the lock nut (130) and turning the screws
(120) counterclockwise. then remove
the seat plate (910).
3. Holding the
" wrench flat (located at
⁄
9
16
the top end of the seat hub (420)) secure,
loosen the seat plate jam nut (450) by
turning it clockwise. then remove the seat
hub (420) from the fixture and disassemble
the remaining parts of the seat plate
assembly.
note: secondary Ptfe seat (570) used only
in high pressure stainless steel options.
4. inspect seat plate (910) radius for damage.
Minor nicks and scratches may be removed
by polishing radius with 320 grit or finer
sand paper, maintaining seat shape.
fiGUre 4, detail d
Main valve seat plate hub assembly
wArninG
No lapping or machining of seat plate allowed.
5. inspect threaded parts and sealing surfaces
and if damaged replace. otherwise, clean all
metal parts with oil free solvent and dry with
lint free towel.
6. the new seat film (610) is supplied as a
square sheet of Ptfe without holes for
the screws. to install, secure the larger end
of the seat hub with the
" wrenching flat
/
9
16
into a vise and install in this order: protector
plate (920), Ptfe seat film (610), seat
bushing (430), spacer (640) (on outside of
seat plate (910), on 6" size seat plates), seat
plate (910) (radius side down) and jam nut
(450). then tighten by turning the jam nut
(450) clockwise.
7. remove the seat hub (420) from the vise and
install it into the fixture. to complete the
assembly, install the secondary seat (570)
(high pressure stainless steel only) and then
the seat retainer (140) (bevel side down)
onto the seat film (610). then using a scribe
punch out a hole in the film starting with the
four threaded indicator holes (only threaded
holes in seat retainer (140)). then install the
4 long retainer screws (120) through those
holes and tighten in a criss cross pattern.
note: lubricate retainer screws (120) with
fluorolube to reduce the chances of galling.
8. Punch out the remaining seat screw holes
and install the screws (120) and nuts (130)
and tighten.
cAution
Be careful not to puncture or scratch the seat
(610) during this operation.
9. trim off the excess film from the outside
diameter of the seat plate (910) to complete
the replacement process.
9
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