Installation, Operation and Maintenance Manual
SERIES T/TE/TW/TWE
ONE-PIECE TOP ENTRY
TRUNNION BALL VALVE
Page:
8
of
12
Document Name: IOM-T
Revision:
15333
Release Date: 06/26/2015
done by qualified personnel. Follow the grease
gun or pump manufactures equipment’s
guidelines for proper use. Local regulations shall
be strictly followed for the safety and health of
persons involved.
8.1) ROUTINE MAINTENANCE
The valve lubricants are designed for routine
valve maintenance. It consists of injecting
lubricant/sealant though the groove or channel
inside the valve leading to seal points around the
ball thus topping off the lubricant/sealant. The
“Top Off” quantity can vary greatly due to
frequency of valve operation and service
conditions. The lubricant is available in stick or
liquid from and should be free from heavy agent
such as PTFE, clay and wax. The most widely
used lubricant by manufacturers and users is
“HYDROCARBON GREASE”.
8.2) VALVE FLUSH
Valve flush is a blend of synthetic oils. It works
through penetration by pressure and often
successful in softening hardened deposits of
lubricants and sealants. It forms protective
coating on the metal surface and impenetrable
barrier which will withstand high pressure and
friction in server service demands.
8.3) VALVE CLEANING
When the valve does not seal properly and
hard to turn, the valve cleaning is required.
Valve cleaners are the product that contains
detergent,
sealant
and
oils.
It
clears
channel/passage where old grease may have
been hardened, inject cleaner through the
lubrication channels, leaves it for three-to-four
hours. If possible, cycle the valve to evenly
distribute the cleaner in the ball-seat contact
area. This procedure is often successful in
freeing seized or hard to turn valve.
Note:
Always displace the valve cleaner with
equal quantities of Lubricant/Sealant after
cleaning.
8.4) EMERGENCY REPAIR
A severe seat or ball damage may cause the
valve to leak. The valve sealants are designed to
stop a leaking valve. The sealant contains
heavier agent such as PTFE and clay in a grease
base. The temporary seal can be achieved by
injecting a heavy sealant. Displace a heavy
sealant after use of a lighter
lubricant/sealant to
avoid
complications. The valve which requires
continuous heavy sealant injections shall be
either replaced or repaired immediately.
9) QUICK REFERENCE
9.1) NEW INSTALLATION “START-UP”
Valves are frequently damaged by debris
during hydro testing or start-up of a New
Installation.
It is very important that the valve be in full
open position during this process.
If the valve is closed or partially open,
debris can damage the ball and find its way
into seat pockets
This can cause the valve to leak soon after
start-up
9.2) PROPER VALVE TESTING
I.
Each valve is to be operated before and
after testing for any unusual torque
requirements.
II.
Test pressure measuring devices are to be
either currently calibrated pressure gages
or pressure transducers.
III.
Tests are to be made with ball and seat
free of any sealant.
IV.
Fluid for shell and seat tests is to be water
with a corrosion inhibitor.
