Installation and Maintenance Manual
Series 19 - Segmented Ball Valves
Date: Feb 2013 / Page 8 of 19
Installation and Maintenance Manual
Series 19 - Segmented Ball Valves
Date: Feb 2013 / Page 9 of 19
®
®
A Subsidiary of BRAY INTERNATIONAL, Inc.
A Subsidiary of BRAY INTERNATIONAL, Inc.
FLOW-TEK, Inc.
Tel: 832.912.2300
© 2012 Flow-Tek, Inc.
8323 N. Eldridge Pkwy #100
Fax: 832.912.2301
Houston, Texas 77041
www.flow-tek.com
FLOW-TEK, Inc.
Tel: 832.912.2300
© 2012 Flow-Tek, Inc.
8323 N. Eldridge Pkwy #100
Fax: 832.912.2301
Houston, Texas 77041
www.flow-tek.com
9. DISASSEMBLY AND REASSEMBLY
9.1 - Removing Actuator from Body
Refer to relevant actuator installation, operation, and
maintenance instructions, and proceed.
UÊ
Support the actuator assembly before disconnecting it
from the body assembly.
UÊ
Unbolt mounting bracket from body and lift actuator
assembly off stem.
9.2 - Replacing the Seat
Refer to parts listing on pg. 12 & 13.
9.2.1 - Detaching the Seat
UÊ
The valve must be removed from the pipeline.
UÊ
Turn the segment (5) so that it does not touch the seat (2).
UÊ
1” (DN25) – 4” (DN100) valves can be dismantled, as
described in “Dismantling the valve” section to make
the replacement of the seat easier.
UÊ
Tap the seat (2) with a soft spindle all around the
circumference from the upstream side to make it fall
into the body (1).
UÊ
Turn the valve and lift the seat (2) from the body (1)
through the downstream flow port.
9.2.2 - Installing the Seat
Clean the flow port that houses the seat. Remove any burrs.
Round off the edges using a fine abrasive paper and clean
the flow port carefully, see below figure.
UÊ
Place the seat O-ring (4) on to the seat (2).
UÊ
Lubricate the flow port, seat (2) and O-ring (4) and the
seat spring (3) with a volatile lubricant. Make sure that
the lubricants are compatible with the medium.
UÊ
Place the seat spring (3) on the seat (2).
UÊ
When the valve is opened, the ends of the spring must
be by the V-shaped opening.
UÊ
Place the seat package into the body.
UÊ
Check that the spring angles extend to the control face.
UÊ
Place a screwdriver on each visible spring angle one
after the other and knock the spring into the groove.
UÊ
Turn the segment (5) 180° clockwise and knock the rest
of the spring angles into the groove.
UÊ
Use a plastic spindle to ensure that the seat (2) is correctly
placed and can move freely.
9.3 - Dismantling the Valve -
See Pg. 10 diagrams
UÊ
Turn the valve into the closed position.
UÊ
Remove the gland retainer (15) by removing both packing
nuts (18) and washers (17). Removing the studs (16)
is not necessary
UÊ
Remove the post cover (20) by dismantling the nuts (23)
and washers (22) and then pushing with Screwdriver.
UÊ
Drive the stem pin (10) and end post pin (11) into the
center of the stem (8) and end post (9) until the outward
end of the pin clears the segment (5). Be careful not
to damage the stem or end post. The pins can then be
punched out of the stem and end post when they are
removed from the valve.
UÊ
Carefully remove post cover (20) and the gasket (19)
and finally the end post (9). (Inserting a bolt in the jack
screw hole, tapped in the post, will help in removing
the post.)
UÊ
Remove the stem (8), along with gland ring (14), packing
(13), and thrust washer (12) by pulling out through
packing box side.
CAUTION:
Take special care to not damage the splined
end of stem (8) during disassembly.
UÊ
Remove the Segment
UÊ
Rotate the segment (5) inside the body (1) so the non-
splined end of the segment (5) is toward the downstream
port of the body (1) and remove the segment (5) straight
out of the body (1)
(See diagram on pg. 10)
CAUTION:
Be extremely careful not to gall or scratch
the sealing surface of the segment (5) when removing
it from body (1). Scratches may later cause excessive
leakage and seal wear.
UÊ
Remove the bearings (6 and 7) and clean the bearing
spaces.
UÊ
Remove the seat (2) by pushing it evenly inside the
body (1)
9.4 Inspection of Removed Parts
UÊ
Clean the removed parts
UÊ
See if the stem (8) and bearings (6 and 7) are damaged.
UÊ
Check if the sealing surface of the segment (5) and the
seat (2) are damaged.
UÊ
If necessary, replace the parts with new.
9.5 Assembly
UÊ
Put the bearings (6 and 7) in their places.
UÊ
Position the segment (5) in the body (1) by lowering it,
splined hole first, into the back of the body (1). Rotate
the segment surface toward the front of the body so that
the splined hole is toward the packing box
CAUTION:
Be extremely careful not to gall or scratch
the sealing surface of the segment (5) when replacing
it in the body (1). Scratches may later cause excessive
leakage and seal wear.
UÊ
Insert the stem (8) through the packing box bore, into
the splined hole of segment (5).
APPENDIX - A
CLASS 150/300
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
