Emerson Baumann 25000 Lo-T Series Instructions Manual

November 2001

25000 Series Lo-T

TM

Butterfly Control Valve

Instruction No. 25.1:IM

Instructions

PRELIMINARY STEPS

Before installation, note the flow direction arrow on the valve
body . The flow should enter the valve on the concave side
of the vane. That is, the side having the exposed shaft.

All valve bodies are rated Class 300 and installs between
ANSI Class 150 and 300 or DIN PN 10 and 25 line flanges.
However, make sure that the vane (2) is in the open position
after installation when the pipe line is hydrostatically tested
since the vane (2) and shaft (3) are not rated for the full
hydrostatic pressure differential.

INST ALLATION

Before installing the valve body between the mating pipe line
flanges, make sure that the vane(2) is in the closed position.
For fail open valves, this can be done by applying 20 psi air
pressure to the actuator (do not exceed 35 psi) or with the top
mounted handwheel (optional). After installation, please back­off handwheel to allow for full vane operation.

The valve bodies are flangeless and will fit between line
flanges with raised faces of Class 150 or 300 and between
metric flanges of PN 10,16 and 25. Nevertheless, the valve
must be properly aligned with the center of the flange to
avoid interference of the flange bore with the vane. The
vane is purposely kept undersized so that it will swing freely
into a flange bore corresponding to a schedule 80 pipe ID.

1. Install tie rods through lower flange holes to form a cradle
for the valve body. For 4” body or Class 300 flange
mounting, tubular spacers may be placed over lower tie rods
to lift body to center. Next, place gaskets on either side of
valve body and add remaining tie rods. Be sure body is
centered with flanges before tightening all tie rods.

2. Before placing the valve in operation, stroke the valve
through its full travel by applying manually regulated air
pressure to the actuator, or by stroking the valve by means of
a handwheel (if provided).

WARNING:

TEMPERATURE LIMITS
NOTE: The bearings and packing are Teflon lubricated which

limits the operating temperatures to 4500F (3250F for
stainless steel bodies) unless special materials are
specified.

For Warnings and Cautions refer to
Supplemental Safety Instruction No. SSI-1

V ALVE BODY MAINTENANCE

BODY DISASSEMBL Y

1. Disconnect air lines from actuator or positioner.
2 . Apply air pressure or use handwheel, if provided, to bring

the actuator stem(35) down (only required for “air-to-open
installations).

3 . Remove 5/16”-24 hex head cap screws(25), washer(26)

and pointer(38) from shaft end(3).

4. Unscrew hex head cap screw(39) and locknut(29) to
loosen linkages(18 &18a) on shaft(3).

5 . Remove hex nuts(13) and slide packing flange(7) and

packing follower(6) away from valve bonnet.

6 . Remove two (2) hex head cap screws(12) from bracket

(17) and pull complete actuator with bracket(17) from
shaft(3) and away from valve body(1).

NOTE: Orientation of bracket and linkage for reassembly.

REMOV AL OF GUIDE BUSHINGS

1. Remove packing rings(15), bottom ring(5) and spring (10).

2. Remove outboard bearing cover assembly(16). (Not
required for 2” valve size.)

3 . Drive out taper pins(14) by placing a 5/32” diameter pin

through drilled holes from the downstream side of the vane
and hit gently with hammer.

4 . Remove shaft(3) and pull out vane(2).

NOTE: Remember orientation of vane for reassembly.

5. Use an 11/16” diameter or 18 mm diameter metal rod and
push guides(4) towards center opening of the body.

REPLACING P ACKING RINGS

1 . Insert compression spring(10) and bottom ring(5) over

shaft(3) and into bonnet.

BAUMANN INC., 2001; All Rights Reserved

2 . Install 5/8”x1” diameter packing rings over shaft (one

at a time) and compress (pound with hollow metal bar).
NOTE: For skive-cut rings rotate each ring
approximately 600 against the previous ring.

REASSEMBLE V ALVE

1 . Reassemble the valve in reverse order as previously

described. Make sure the vane touches the body bore
properly when actuator is in the “closed” position by
rotating the bracket with actuator attached “clockwise”
for air-to-open within the clearance of sockethead
screws (12) (“counter clockwise” for air-to-close). This
will preload the actuator springs slightly. Tighten
sockethead cap screws(12) in the preloaded position.
NOTE: For “fail-close” action, the vane always closes
when the shaft is turned clockwise and counterclockwise
for “fail-open” action.

2 . Realign pointer(38) if necessary and tighten hexhead

cap screw (25).

3 . Rotate shaft with vane through about 700 from closed

position. There should be no interference.

IMPORT ANT :

When replacing bracket(17), remove taper
pins(14) from vane(2) and redrill taper pin holes
in shaft(3) (new shaft is required) after the vane
has been fully assembled with actuator in place
and in correct stroke position, and shaft is pressed
against ball bearing(24) by cap screw(25).
Vane should be in closed position and kept in
center of body bore with paper shims.

ACTUATOR MAINTENANCE

REPLACE DIAPHRAGM

1. Disconnect air lines.

2. Remove cap screws(45), nuts(46), and upper
diaphragm case(41).

3. Hold lower portion of actuator stem(35) with 11/16”
wrench. Loosen and remove head bolt(49) and
diaphragm plate(42).
NOTE: Spring load will be relieved.

4 . Replace diaphragm(43). Note location of bolt holes

andmake sure the rolled portion of the diaphragm fits
into the lower diaphragm case(40). Do not disturb
springs(47). Replace head bolt(49) and tighten.

5. Reassemble upper diaphragm case(41) and check
operation with air through 1-9/16” stroke. There should
be no more than 2% of signal span deadband (no
valve attached).

REVERSE ACTION

1 . Remove air lines.
2 . Remove actuator, shaft(3) and vane(2).

3 . Reinstall vane(2) in reverse direction, i.e. closing clockwise

instead of counterclockwise or vice versa.

4 . With vane in new location, it is recommended to replace

with new shaft(3) for better results. Slide actuator back
onto shaft(3). Retighten all cap screws(12)(25)(39) as
previously described. Bring actuator into “closed” position.

5 . Redrill pin holes (14) of vane and shaft in new location with

edge of vane pushed firmly into housing (use c-clamp).

DISASSEMBLE ACTUA TOR

1 . Remove actuator from valve body.

2. Unscrew hex head cap screws(45) and remove upper
diaphragm case(41).

3. Remove head bolt(49) while holding actuator stem(35) with
11/16” wrench.
NOTE: Spring load will be released.

4. Pull diaphragm plate(42) with diaphragm(43) from assembly.

5. Hold actuator stem(35) with wrench and unscrew ball
joint(36). Replace Belleville washers(51) if required.

6 . When replacing ball joint(36) make sure distance 3-7/32”

(82mm) from center of ball to lower diaphragm case(40) is
maintained. Tighten travel stop(48) with jam nut(30).

REASSEMBL Y OF ACTUA TOR

1. Attach stem(35) to diaphragm plate(42) using head bolt
(49) and Belleville washer(51).

2 . Place springs(47) (use 4 for 4-15 psi bench range and 6 for

6-22 psi or 8-35 psi bench range) into lower diaphragm
case(40).

3. Place diaphragm plate(42) over springs(47). Rotate
diaphragm plate(42) back and forth until all springs are
centered on guides (place 4 springs symmetrically).

4 . Attach diaphragm(43) to diaphragm plate(42) with head

bolt(49).
NOTE: Holes to line up with lower diaphragm case(40).

5 . Place upper diaphragm case(41) on top of lower case (40)

and tighten hex head cap screws(45) and nuts(46) evenly.
Push spring(47) down to engage screws(45).

6. Apply approximately 10 psi air pressure to actuator or move
stem(35) down with optional handwheel if provided.

7. Remove air pressure and turn actuator over for bracket (17)
to point up. Insert travel stop(48) with flat facing towards
opening in bracket. Next, screw ball joint(36) into stem(35)
until center of ball joint extends 3-7/32” from lower surface of
diaphragm case(40). Lock with jam nut(30).
NOTE: Ball joint to be perpendicular to valve stem axis.

8 . Place pair of linkages(18) as shown; ensure that linkage

with slot faces towards valve. Insert screw(39) and partly
engage nut(29) (linkage to hang loose).
Note Orientation: Extended side of linkage hubs to face
outwards.

9. Apply approximately 10 psi air pressure to actuator and
slide actuator, packing follower(6), packing flange(7) and
linkages(18 & 18a) onto shaft(3). Note vane location for
reassembly. Actuator stem(35) should be pushed down.

-2-

10. Engage screws(12) and bolt bracket(17) against valve
body(1). Engage nuts(13) finger tight, then tighten nuts
1/2 to 1 full turn using a wrench.

11. Insert screw(25) with pointer(38) and washer(26) to
shaft(3) and tighten.

12. Slide linkages(18) to center of tube bracket(17) and
tighten screw(39). (This will lock linkages (18) on to
shaft(3).)

13 . Use air pressure to stroke actuator through full travel

(1-9/16”); there should be no binding or deadband
exceeding 0.8 psi, check for air leakage.

14. Make sure shaft is tight against ball bearing(24), tighten
hex head cap screws (25).

15. Pin vane(2) to shaft(3) in the “closed” valve position if
required.

16 . Align pointer(38) with serial plate(62) in the “closed” vane

position.

17 . Set lower tap screw(31) if required to limit down travel.

-3-

PARTS REQUIRED FOR HANDWHEEL

(Replace Upper Diaphragm Case P/N 25989
with P/N 25990 when using handwheel)

ITEM QTY DESCRIPTION PART NO.

52 1 Handwheel w/stem 25985
57 1 Adapter 25978
58 1 Self-Locking Nut 25924

60* 1 O-Ring 25926

61 1 Lock Nut 25979

-4-

CARBON STEEL BODY SUBASSEMBL Y

ITEM QTY DESCRIPTION 2" 3" 4" 6" 8"

1 1 Body 25202 25203 25204 25206 25208
2 1 V ane 25402S 25403 25404 25406 25408
3 1 Shaft 25882 25883 25884 25886 25888

4* 2 Guide, PTFE/Bronze 2 56 08 25600 25617
10 1 Spring 25702 N/A

14* 2 Taper Pin 25707-2 25707-3-4 257 07-6 25707-8

16 1 Co ver N/A 25630 25631
81 1 Gas k et N/A 25635 24156

82 1 Flange, Bearing Co ver N/A 25632 25633

83 2 Sockethead Screw N/A 25718

STAINLESS STEEL BODY SUBASSEMBL Y

ITEM QTY DESCRIPTION 2" 3" 4" 6" 8"

1 1 Body 25202S 25203S 25204S 25206S 25208S
2 1 Vane 25402S 25403S 25404S 25406S 25408S
3 1 Shaft 25882S 2 5883S 25884S 25886S 2588 8S

4* 2
10 1 Spring 25702 N/A

14* 2 Ta per Pin 25707-2 25707-3-4 25707-6 25707-8

16 1 Cov er N/A 25630 25631

81 1 Gasket N/A 25635 24156
82 1 Flange, Bearing Cov er N/A 25632 25633
83 2 Socke t head Screw N/A 25718

Guide, PTFE Fiberglass 25609 25601 25618

Guide, Stellite 25625 25626 25627

PARTS

KEY

QTY DESCRIPTION PART NO.

NO.

5* 1 Bott om Ring 25602
6* 1 Packing Fo llower S/A 41611
78 1 Packing Flange 25606
11 2 Stuffingbox S tuds 25703M
12 2 Sockethead Screw 25836 M-1S
13 2 Hex Nuts 25705M

15* 5 Packing Rin g 25 708-1/-2

17 1 Yo ke, Actuat or 25881
18 2 Linkage 20052
19 2 Lockwasher 25736

24* 1 Ball Bearing Assembly 25850

25 1 Hex Head Cap Screw 25860S
26 1 Washer 25861
27 4 He x Head C ap S crew 200 86
28 4 Nut 971511-010-250
29 1 Locknut 21804
30 1 Jam Nut 971514-002-250
31 1 Se t Screw 4 2788
32 1 Jam Nut 42789
33 9 Lockwashers 25734
35 1 Actuator Stem 25937

*Recommended Spare Parts

KEY

NO.

-5-

QTY DESCRIPTION PART NO.

36*

38 1 Pointer 25911
39 1 He x Head Cap Scre w 25863
40 1 Lower Diaphragm Cas e 21935

41 1 Upper Diaphragm Case 25989

42 1 Diaphragm Plate 0.330-0420

43*

45

46 8 Nut 971511-011-250

47

48 1 Trav el Stop 21826
49 1 He ad Bolt 25987

51 2 Belleville Washer 25918
62 1 Se rial Plate 25901
63 3 Washer SAE #12 25914
93 4 Lockwasher 20057
94 1 Coupler 21802

1 Ball Join t 2589 4
1 Ball Joint, Hi-Temp 258 94 -1

1 Diaphragm 24698

1 Diaphragm, Hi-Temp 24698-721
6 Hex Head Ca p S crew 25913-1
2 Hex Head Ca p S crew 247 83

4 Springs ( 4-15p si) 25940
6 Springs ( 6-22p si) 25940
6 Springs ( 8-35p si) 21819

DIMENSIONS

VALVE SIZE

(INCHES)

2 6.73 4.00 1.56 27
3 7.30 5.25 1.56 31
4 7.96 6.45 1.56 37
6 9.56 8.63 2.00 43
8 10.65 10.81 2.50 60

A B C

WEIGHT

(LBS)

This product may be covered under one or more of the following patents 4,469,305 or under pending patent applications.

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All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express or
implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

Baumann Inc.

35 Mirona Road
Portsmouth, NH 03801
T 1(603) 436-2044
F 1(603) 436-4901

BAUMANN INC.

Subsidiary of Fisher Controls International, Inc.