API 6D Two - Piece
Cast Trunnion
Mounted Ball Valve
Atlas Series
Document Number:
Revision:
Release Date:
EDC 506
0
01/03/2018
IOM: Installation, Operation and Maintenance Manual
8/17
3.1 NAMEPLATE
Nameplates provided on the products are designed to either advise operators of residual hazard or provide
information regarding the valve. Hiding or removing such information can be very dangerous to personnel
operating or maintaining the valve.
3.2 HIGH TEMPERATURE SERVICE
Some valves do have operating temperatures that can be very dangerous to people or animals. To avoid
any kind of injuries operators must ensure the valve surfaces that reach such temperatures are suitably
protected against accidental contact.
Operators are recommended to always provide an efficient protection/insulation of the valve surfaces that
may be touched by personnel and/or animals and that exceed, in lower or in higher, the human tolerable
limits (as a suggestion use -4
F t140
F).
3.3 LOW TEMPERATURE SERVICE
Prior to exposure to freezing temperatures, it is highly recommended the valve be drained. Water that may
be trapped in the body cavity could freeze and impair the operation of the valve or damage the valve. If the
valve has a grease fitting in the lower drain, a sufficient amount of antifreeze injected into the body cavity
via the lower drain grease fitting will prevent accumulated water from freezing. It is also advisable to inject
a sufficient amount of valve lubricant into the grease fittings of valve and operator (if present) prior to
extended cold temperature exposure.
4 OPERATION
4.1 INITIAL START-UP/COMMISSIONING
Once installed in the line the valve should be left either in the fully open or fully closed position, depending
on the start-up/commissioning operation.
4.2 NORMAL OPERATING ACTIVITY
The valve is designed for on/off service only. Pressure - temperature limits are stated on the valve
nameplate. Do not use valve for flow control neither in the partially open position nor for throttling service,
as these could lead to premature failure. The valve can be operated from the fully open to the fully closed
position by acting on the hand wheel/lever (clockwise to close). When the stem flats or keyway are
perpendicular to the fluid bore, valve is closed. Positive stops and arrow indication are provided on handles
and gear operators.
4.3 DOUBLE BLOCK AND BLEED OPERATION
When pressure is applied to both ends of a closed valve, each seat will be forced against the ball, creating
a double block. The hex head bleed fitting (40) provides a safe and convenient method for checking closed
valve seat sealing effectiveness.
Do not leave the valve in partially open position for a long period. Ensure the
pipeline is free of any debris such as sand, tools, welding slag or weld
splatter and rod ends. This will damage the valve ball and seats during the
start-up/commissioning operations.
