Instruction Manual
D102175X012
EZ-C, ET-C, and EWT-C Valves
July 2017
5
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for packing maintenance
and trim maintenance. All maintenance operations may be performed with the valve in the line.
WARNING
Avoid personal injury or property damage 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
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D
Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot 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 pneumatic 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
The valve packing box 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, or when
loosening the packing box pipe plug.
D
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
CAUTION
Follow instructions carefully to avoid damaging the product surfaces, which could result in damage to the product.
Note
Whenever a gasket seal is disturbed by removing or shifting parts, a new gasket should be installed upon reassembly. This is
necessary to ensure a good gasket seal since the used gasket may not seal properly.
Figure 2. Single PTFE V‐Ring Packing Arrangement
12A7837‐A
A6745
UPPER WIPER
(KEY 12)
PACKING
FOLLOWER
(KEY 13)
WASHER
(KEY 10)
SPRING
(KEY 8)
PACKING BOX
RING (KEY 11)
FEMALE
ADAPTER
PACKING RING
MALE
ADAPTER
LOWER WIPER
NOTE:
PACKING SET (KEY 6) CONTAINS A FEMALE ADAPTER, V-RING PACKING RINGS, MALE ADAPTER, AND LOWER WIPER RINGS.
1
1
1
1
1
