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YarwaY hardseat and seatless tandem blow-off valve service and
operation manual
SEaTLESS VaLVE
Item
description
1
body assembly
2
Yoke
2a
lubrication fitting
3
lower packing ring assembly
4
upper packing ring assembly
5
lower gland
6
upper gland
8
plunger assembly
9
stem
11
ball thrust bearing
12
handwheel
13
stop screw
13a
stop screw gasket
14
springs
15
Yoke studs
15a
Yoke stud nuts (4 per set)
SEaTLESS VaLVE
packing ring adjustment yoke nuts (15a) should
be tightened at regular intervals. the yoke
springs (14) will maintain a constant load on the
packing, but the packing rings will relax slightly
during use and an adjustment may be required.
to adjust the packing, back the plunger off
slightly by turning the handwheel (do not allow
flow to occur) and then tighten the yoke nuts.
¼ to ½ turn should be sufficient. reseat the
plunger against the upper gland.
NOTE:
if the valve has not been operated for a long period,
the packing nuts should be ajusted prior to blowing
down the boiler.
Hardseat valve
hardSEaT SEaT VaLVE
Item
description
1
body assembly
19
Gland
20
disc
21
split gland bushing
22
disc nut
23
stuffing box bushing
24
Yoke bushing
25
stem
26
Gland bolts
27
handwheel
28
packing
31
disc insert
hardSEaT VaLVE
for cleaning, all internal parts of the hardseat
valve may be removed without disconnecting
the body from the line. if the inside of the valve
must be cleaned, or if a foreign body lodged in
the valve prevents proper seating of the disc,
disassemble as follows:
(1) loosen the gland flange and remove the split
gland bushing
(2) turn the handwheel past its full open position
to jack the packing and stuffing box
(3) break the tack weld on the yoke bushing and
back out this bushing
(4) remove the internal parts through the top of
the yoke.
when the valve is reassembled, the yoke must
be tack welded in place to prevent accidental
loosening of the bushing while the valve is in
service. it is also advisable to keep the disc
clear of the seat during reassembly of the yoke
bushing.
seatless valve
reseating hardseat valve
a specially designed Yarway reseating tool
cuts a new surface on a worn or damaged seat
without removing the unit-tandem valve from
the line. there are cutters of various sizes to
assure that all seats are cut at the proper angle
without lapping the seat and disc. prices and
complete details are available.
2