Instruction Manual

Instruction Manual
D101554X012
Vee-Ball Valves
January 2015
46
Appendix A
Instructions for Non-Series B
The Series B changes affected only the NPS 3 through 12 valves without attenuators. To determine if a Vee-Ball valve is
Series B, you will need to examine several of the internal parts. Compare the distinctive skirted V-notch outline of t he
forwardsideandthecircularedgeonthereversesideoftheSeriesBdesignballtotheV-notchonbothsidesofthe
non-series B design ball. Then look for bushings. The lack of bushings indicates the valve body is Series B.
All Vee-Ball valves NPS 3 through 12 produced before the Series B design changes use the Specifications table, the
Installation, Maintenance, Packing Maintenance, Replacing Packing, and Replacing the Ball Seal instructions found
elsewhere in this manual. Bearing and Vee-Ball Maintenance and Actuator Mounting instructions for these valves may
be found below.
Maintenance
WARNING
The Vee-ball closes with a shearing, cutting motion, which could result in personal injury. To avoid injury, keep hands,
tools, and other objects away from the Vee-ball while stroking the valve.
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator c annot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock-out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D The valve packing area may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check w ith your process or safety engineer for any additional measures that must be taken to protect against process
media.
Procedures for disassembly and assembly of the bearings and ball cannot be accomplished until the ball seal and valve
packing are removed from the valve.
1. Refer to the Replacing Packing procedures to remove the actuator, and to remove the packing flange and packing
follower from the valve. When the packing disassembly steps are complete, return to this section.
2. Refer to the Replacing the Ball Seal procedures to remove the ball seal from the valve.
Disassembly
WARNING
When the actuator is removed from the valve, the ball/shaft assembly may suddenly rotate, with a shearing, cutting
motion, which could result in personal injury. To avoid injury, carefully rotate the ball to a stable position. Make sure the
ball will not rotate.