Flowserve BX2001 Durco User Manual

Page 23

DURCO BX2001 USER INSTRUCTIONS ENGLISH 9-13

10. For valves with bottom end cap design, slide one thrust

bearing onto the shaft, attach the bearing cap to the end

of the shaft (use thread cement and torque fasteners to

30 ft-lbs). Place the second thrust bearing on the bearing

cap. Place the bottom cap gasket on the bottom cap and

install the bottom cap. Torque bottom cap fasteners to

75 ft-lbs in a criss-cross pattern.

SECTION VII
COMPLETE VALVE REPAIR (continued)

vALvE ASSEMBLY — 14" thru 36"
1. Lay the valve body on the table with the seat pocket side

down. Insert a bearing into the top and bottom shaft

bore. Some designs of fire sealed bearings require a

separate metal outer sleeve (included in the repair kit).

Insert the PTFE/stainless bearing into the metal sleeve

prior to installing the bearing into the shaft bore. Note:

Severe service and fire sealed bearings are split. Align

the splits towards opposite sides of the valve.

2. Insert packing thrust washer, packing set and packing

gland into the top packing bore of the valve body. Install

packing adjuster and fasteners. Finger-tighten the

fasteners. These fasteners will be tightened to the

required torque after the shaft is installed. Do not install

the bottom packing set. It is installed after the shaft.

3. Place the disc face down into the valve body with the disc

pin holes towards the top of the body. Align the shaft

bores of the disc and valve body. Very close alignment

of the bores is required to insert the shaft.

4. Carefully slide the shaft through the bottom shaft bore

(the end without the stem packing installed) of the valve

body and into the disc bore.

Note: For valves with a stepped shaft design, place the

shaft thrust washer over the top end of the shaft before

the shaft enters into the top shaft bore of the body.

5. Push the shaft through the body until the tapered disc pin

holes in the disc and shaft are aligned.

6. Verify that the orientation of the shaft is such that the

taper direction of the pin holes in the shaft matches the

taper direction of the pin holes in the disc. When properly

orientated, the tapered holes will match perfectly and

the word “DISC”, stamped on the shaft below the shaft

square, will be located on the same side as the front face

of the disc (the seat pocket side of the valve body).

7. Insert the tapered disc pins and firmly set each pin using

a punch and hammer. Check disc and shaft connection to

ensure there is no looseness.

8. Weld the small end of each pin to the disc. Be certain to

use weld rod compatible with pin and disc materials and

service environment.

9. For valves with bottom stem packing, insert packing thrust

washer, packing set and packing gland into the bottom pack-

ing bore of the valve body. Install packing adjuster and fas-

teners. Finger-tighten the fasteners. Note: For valves with a

stepped shaft design, insert the shaft thrust washer into the

packing bore prior to installing the packing thrust washer.

TAPER PIN

SHAFT
BEARING

PACKING
THRUST WASHER

STEM
PACKING

PACKING
GLAND

ADJUSTER

SHAFT
THRUST WASHER

GROUND
SPRING

BOTTOM CAP
FASTENER

LOCK

WASHER

BOTTOM

CAP

BOTTOM CAP
GASKET

THRUST

BEARING

CAP

BEARING CAP

FASTENER

THRUST
BEARING

THRUST
WASHER

SHAFT
BEARING

SHAFT

Do not use excessive force to push the shaft through the disc

or galling may occur.

FIGURE 2

Stepped Shaft Design

FIGURE 3

Bottom Cap Design

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