Instruction Manual
D102231X012
SS-138B and SS-252B Valves
April 2019
Fisher™ SS‐138B and SS‐252B Rotary Ball Valves
Introduction
This special instruction manual is an addendum to the Fisher Vee‐Ball™ V150, V200, and V300 Rotary Control Valves
NPS 1 through 12 Instruction Manual (D101554X012
instruction manual. A copy of the manual is attached to this special instruction manual for your reference.
Scope
This special instruction manual provides the assembly, disassembly, and parts information of the seal shims and seal
assembly for the SS‐252B, and of the seal shims and flow ring construction for the SS‐138B. For other procedures, refer
to the Fisher Vee‐Ball V150, V200, and V300 Rotary Control Valves NPS 1 through 12 Instruction Manual
(D101554X012).
Do not install, operate, or maintain SS-138B and SS-252B rotary ball valves without being fully trained and qualified in
valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage,
it is important to carefully read, understand, and follow all the contents of this manual, including all safety cautions
and warnings. If you have any questions about these instructions, contact your Emerson sales office
proceeding.
). Observe all Warnings, Cautions, and Notes provided in the
before
Description
The SS‐138B valve, a modified V200 or V300, has a metal flow ring construction with a V‐notch ball adjusted by
shimming to the center of the valve body cavity to hold the flow ring 0.254 to 0.508 mm (0.010 to 0.020 inch) away
from the ball.
The SS‐252B valve, a modified V300, has a stellite metal seal with a V‐notch ball adjusted by shimming to the center of
the valve body cavity to obtain zero ball seal deflection. The maximum allowable leakage rates (scfh) for this valve are
400 for NPS 2, 500 for NPS 3, 800 for NPS 4, and 1100 for NPS 6.
Educational Services
For information on available courses for Fisher SS-138B and SS-252B rotary ball valves, as well as a variety of other
products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: education@emerson.com
emerson.com/fishervalvetraining
www.Fisher.com
SS-138B and SS-252B Valves
April 2019
Figure 1. Detail of Fisher SS‐252B Metal Seal with Multiple Springs
GRAPHITE
GASKET
SUPPORT
SLEEVE SEAL
POINT A
Instruction Manual
D102231X012
SPRING
SEALS
SHIMS
SEAL
PROTECTOR
RING
PACKING
RING
27B5926_E
SUPPORT
SLEEVE
BACKUP
RING
SHIMS
METAL
BALL SEAL
NPS 1-2
POINT B
SEAL
PROTECTOR
RING
14B1834‐E
A6767‐1
METAL
BALL SEAL
NPS 3-8
Assembly of Metal Ball Seal with Multiple Spring Seals for SS‐252B
WARNING
When the actuator is removed from the valve, the Vee‐Ball/shaft assembly may suddenly rotate, resulting in personal
injury. To avoid injury, carefully rotate the ball to the bottom of the valve body cavity. Make sure the ball will not rotate.
1. Install the seal shims in the valve, and install the seal on top of the seal shims. Add or remove shims under the seal
as necessary to obtain zero ball seal deflection.
Note
Zero ball seal deflection is the point at which the addition of one 0.13 millimeter (0.005‐inch) thick shim causes contact between
the ball and ball seal to be broken. Hold the parts tightly together when determining zero deflection, or improper zero deflection
might result.
2. Add five spring seals on top of the metal seal, then install the seal protector ring.
Note
Make the following measurement before compressing the spring seals for the first time.
3. Measure the distance at point “A” (figure 1 in this special manual) between the seal protector ring and the valve
body.
a. Add a spring seal at point “B” if the measurement is less than 0.635 mm (0.025 inch) at point “A”.
b. If necessary, add additional spring seals at point “B” until the measurement is 0.635 to 1.27 mm (0.025 to 0.050
inch).
2
Instruction Manual
D102231X012
SS-138B and SS-252B Valves
April 2019
4. Remove the seal protector ring, and add the flexible graphite gasket between the valve body and seal protector
ring.
5. Install the seal protector clips, or washers, and seal protector screws (keys 21 and 22) to secure the seal protector
ring to the valve body.
6. Refer to the Fisher Vee‐Ball V150, V200, and V300 NPS 1 through 12 Instruction Manual (D101554X012
) to
continue the reassembly of the valve.
Figure 2. Fisher SS‐138B Seal Details
GRAFOIL
GASKET
SEAL
PROTECTOR
RING
27B7547_D
GASKET
FLOW RING
NPS 1 AND 1-1/2
SPRING SEAL
SHIMS
BACKUP
RING
FLOW RING
FROM 0.254 TO 0.508 mm
(0.010 TO 0.020 INCHES)
CLEARANCE
RETAINER
RING
(KEY 3)
VEE BALL
(KEY 2)
SHIM SEAL
(KEY 12)
FLOW RING
(KEY 42)
SPRING SEAL
(KEY 13)
GASKET
(KEY 15)
SEAL
PROTECTOR
RING
NPS 2
E0029
NPS 3-8
BACKUP RING
SHIM SEAL
3
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