Bray 19 Series - Manual (Page 5)

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.
UÊSupport the actuator assembly before disconnecting it
from the body assembly.
UÊUnbolt 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
UÊThe valve must be removed from the pipeline.
UÊTurn the segment (5) so that it does not touch the seat (2).
UÊ1” (DN25) – 4” (DN100) valves can be dismantled, as
described in “Dismantling the valve” section to make
the replacement of the seat easier.
UÊTap the seat (2) with a soft spindle all around the
circumference from the upstream side to make it fall
into the body (1).
UÊTurn 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.
UÊPlace the seat O-ring (4) on to the seat (2).
UÊLubricate 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.
UÊPlace the seat spring (3) on the seat (2).
UÊWhen the valve is opened, the ends of the spring must
be by the V-shaped opening.
UÊPlace the seat package into the body.
UÊCheck that the spring angles extend to the control face.
UÊPlace a screwdriver on each visible spring angle one
after the other and knock the spring into the groove.
UÊTurn the segment (5) 180° clockwise and knock the rest
of the spring angles into the groove.
UÊUse 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
UÊTurn the valve into the closed position.
UÊRemove the gland retainer (15) by removing both packing
nuts (18) and washers (17). Removing the studs (16)
is not necessary
UÊRemove the post cover (20) by dismantling the nuts (23)
and washers (22) and then pushing with Screwdriver.
UÊDrive 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.
UÊCarefully 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.)
UÊRemove 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.
UÊRemove the Segment
UÊRotate 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.
UÊRemove the bearings (6 and 7) and clean the bearing
spaces.
UÊRemove the seat (2) by pushing it evenly inside the
body (1)
9.4 Inspection of Removed Parts
UÊClean the removed parts
UÊSee if the stem (8) and bearings (6 and 7) are damaged.
UÊCheck if the sealing surface of the segment (5) and the
seat (2) are damaged.
UÊIf necessary, replace the parts with new.
9.5 Assembly
UÊPut the bearings (6 and 7) in their places.
UÊPosition 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.
UÊInsert 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