Bray MPF150_130_230_240 Series - Manual (Page 3)

Installation and Maintenance Manual
MPF150/300, MPT230/240 Ball Valves
Date: April 2012 / Page 3 of 8
®
A Subsidiary of BRAY INTERNATIONAL, Inc.
FLOW-TEK, Inc. Tel: 832.912.2300 © 2011 Flow-Tek, Inc.
8323 N. Eldridge Pkwy #100 Fax: 832.912.2301
Houston, Texas 77041 www.flow-tek.com
1/4”-2” Model MPT230
Valve Disassembly Procedures:
1. Unscrew handle nut (16) off stem (6), and take the
handle (17) away from the stem;
2. Remove the Stop Plate(15), Spacer Washer (14)
and Lock Saddle (13); unscrew stem nut(12);
remove belleville washer (11) from the stem; To
assist in unscrewing the stem nut(12), a rod with
diameter smaller than the ball orifice may be
placed into the ball orifice.
3. Remove four body bolts (22) from each side of
the valve and separate end caps(1A,1B) from the
valve body; 4 Remove the all the gaskets(2) and
seats from end caps or valve body; 5 Turn stem
until ball slot or stem flat is parallel to the port
centerline, then the ball will be easily removed
from the valve body; 6 Press the stem into the
inside of the valve body, and remove the stem,
thrust washer(7) and O-Ring(8); 7 On top of the
valve, remove the packing gland(10) and stem
packing (9);
Valve Assembly Procedures:
1. Put O-Ring(8) and Thrust Washer (7) on valve
stem (6) and slide the stem into the stem hole on
valve body (3);
2. Slide the stem packing (9) onto the stem until it is
seated against the bottom of the stem hole;
3. Put packing gland (10) onto the stem, on top of
the stem packing;
4. Turn the stem until the stem flat is parallel to the
port centerline (so that the ball can fit onto the
stem);
5. Install each seat (5) inside the seat pocket of the 4
end caps, make sure the spherical curvature side
of the seat will face the ball;
6. Put the ball (4) inside the valve body, the stem flat
will fit into the slot on top of the ball and the side
slot near the stem slot will fit into the Pin Insert
(21);
7. Turn the stem so that the ball opening is parallel to
the port centerline;
8. Place each body gasket (2) onto the 4 end caps;
Push the gasket all the way down to the sealing
surface of each end cap;
9. Assemble the end cap (1A, 1B) onto the valve
body, loosely tighten Body Bolts(22) and line up
end flange. Because the body flange bolt pattern
is different from the line flange bolt pattern, it is
possible to assemble the valve such that the bolt
holes in the line flanges don’t line up. Be certain
to align end flanges bolt holes to straddle valve
center lines. NOTE: Be careful not to damage
gasket when putting end cap into body.
10. Tighten nuts in a “star” pattern to the torque
specified in the chart; Tighten one end piece in
a similar fashion as tightening the opposite end
piece. Do not tighten one end piece fully until the
opposite end piece were fully tightened. NOTE:
Valve must be in the 100% full open position.
11. Put Belleville washer (13) together in series mode
(bottom Belleville washer curve facing up, the top
Belleville washer curve facing down), and then
place them onto the stem, on top of the packing
gland; Screw stem nut(12) onto stem, on top of
the belleville washer; Tighten the stem nut to the
required stem gland nut torque value as specified
in the chart. NOTE: The use of a bore alignment
tool, about 1.0 mm [0.04 inch] less than the
internal diameter of the end cap and ball, inserted
through the end cap and ball will prevent the ball
from turning as the stem gland nut is tightened
on the stem. Material for the bore alignment tool
should be made from a material softer than 300
Series S.S. so that it will not inadvertently scratch
the valve end cap or ball. Suggested materials:
aluminum T6061, Acetal or other suitable hard
polymer/plastic material.
12. Install Lock Saddle(13) on top of the stem nut;
Put Space Washer(14) on top of the lock saddle,
then put Stop Plate(15) onto stem, make sure the