Flowserve V-377 R4 Edward Valves User Manual

Page 45

Flow Control Division

Edward Valves

6. Open valve to the backseat with the

bonnet studs loose. Use the hand-
wheel to back-seat the valve 2 or 3
light taps. This will align the bonnet
with the other parts.

7. Install and tighten the bonnet stud

nuts in accordance with the torque
values shown on page 10. All nuts
must be tightened uniformly in a star
pattern to avoid cocking the bonnet.

8. Reassemble the operator to the

valve using a procedure opposite the
disassembly.

Type I Pressure-Seal Bonnets –

Piston-Lift Check Valves

See Illustration No. 21 on page 29.

1. Insert the disk-piston, lowering it care-

fully until it rests on the valve seat.

2. Reassemble the cover, pressure-seal

gasket, and cover retainer, leaving
the parts loose and using a new
gasket.

3. Lower the cover, gasket, and cover

retainer assembly carefully into the
valve.

4. Install and tighten the cover retainer

stud nuts using the torque valves on
page 10.

5. Install and tighten the cover stud nuts

in accordance with the torque values
shown on page 10. All nuts should
be tightened uniformly in a star pat-
tern to avoid cocking the cover.

Type II Pressure-Seal Bonnets – Stop

and Stop-Check (Non-Return) Valves

with Revolving Stems

See Illustration No. 22 on page 30.

1. Insert the disk, disk-nut, stem assem-

bly, or the disk-piston and stem, low-
ering carefully until they rest on the
valve seat. Hold the stem centrally in
the valve bore.

2. Install a new pressure-seal gasket and

the spacer ring on the bonnet. Lower
this assembly carefully into the body
until it rests on top of the stem back-
seat or disk-piston.

3. Insert the gasket retainer segments in

the body groove.

4. Install the bonnet retainer screw thrust

washer on the body.

5. Lower the bonnet retainer ring over

the stem.

6. Lift the stem, pulling the bonnet,

pressure-seal gasket, and spacer ring
assembly up to the gasket retainer
segments.

7. Screw the bonnet retainer ring onto

the bonnet to the position marked in
the disassembly.

8. Tighten the bonnet retainer cap

screws in accordance with the torque
values shown on page 10. All screws
must be tightened uniformly in a star
pattern to avoid cocking the bonnet.
The stem can now be lowered to the
closed position.

9. Retrace disassembly steps 5, 4, 3,

and 1 on page 33.

10. Reassemble the operator to the

valve using a procedure opposite the
disassembly.

Type II Pressure-Seal Bonnets –

Stop and Stop-Check (Non-Return)

Valves with Non-Revolving Stems

See Illustration No. 23 on page 31.