Warren Controls 2900 Series High Capacity general purpose Globe Valves - Manual (Page 11)

11
Series 2900 IOM2900 A 1209
series 2900 high capacity General purpose
Globe are for the most part maintenance free when
properly selected and installed. Rebuilding of these
valves should not be necessary under normal oper-
ating conditions. For best operation follow installation
guidelines (See Installation section); maintain the fluid
pressure, temperature, flow, flowing differential pres-
sure, and shut-off differential pressure within the limits
of the valve (See Series 2900 Product Specification
for details). In installations where high vibration exists,
pneumatic and/or electrical connections should peri-
odically be checked for integrity. In water or water and
glycol applications, good water quality must be main-
tained or the service life of the valve may be reduced (See Water Quality Guidelines). The valve stem must be
kept free of debris, deposits, dirt, dust, and scratches
or the packing parts may be damaged resulting in a
packing leak. Control valve hunting will cause exces-
sive stroking of the valve stem and result in premature
failure of the packing seal. The system must be stabi-
lized to prevent hunting to ensure reasonable packing
life and optimal control performance. Oversizing of a
control valve will result in an unstable condition, which
can cause noise, vibration, and premature trim and
packing seal failure. The use of Warren Controls Valve-
Works sizing program will facilitate the selection of the
optimum valve.
MaIntenance
packInG aDjustMent
parts/ overhaul
series 2900 high capacity General purpose
Globe Control Valves have either self-adjusting pack-
ing or adjustable packing. 29n models with Packing
Type t V-ring, v Vacuum Service, or l Lip Packing have
self-adjusting packing and require no external adjust-
ment. 291 models with Packing Type t V-ring Packing
also have self-adjusting packing and require no exter-
nal adjustment. If the valve has self-adjusting packing
and a packing leak is observed replace the packing
and if necessary the stem and plug assembly. 29n models with Packing Type G Graphite have ad-
justable packing. 291 models with Packing Type G
Graphite also have adjustable packing. If the valve has
adjustable packing and a packing leak is observed,
tighten the packing nut ¼ turn and observe. If the leak
continues tighten the packing nut another ¼ turn and
observe. Repeat as necessary. If the leak continues
and the packing nut cannot be tightened further with
reasonable force replace the packing and if necessary
the stem and plug assembly.
Damaged or worn parts can decrease performance
and shorten valve life.
Damaged or worn packing parts including the packing,
bearings, spring, and other bonnet parts can cause a
packing leak resulting in damage to the actuator, ac-
cessories, and surrounding equipment. Damaged or
worn packing parts can also cause increased hyster-
esis resulting in poor control.
Damaged or worn trim parts including the plug, stem,
seat ring, piston, piston chamber, piston guide, piston
seal, and o-ring can cause increased hysteresis, poor
control, excessive internal leakage, and poor shut-off.
Damaged or worn trim parts can also cause damage to
the packing parts resulting in a packing leak.
Damaged or worn body gaskets or o-ring seals can
cause external leakage resulting in damage to the ac-
tuator, accessories, and surrounding equipment.
Should parts become worn or damaged, parts kits
are available. Repack Kits are available to replace the
packing. Repack/Inspection Kits are available to allow
the valve to be opened for inspection of its internal
parts. Rebuild/Repack Kits are available to completely
rebuild/ overhaul the valve. Parts kits come with com-
plete step-by-step instructions. Each kit has its own
part number. Please provide the valve’s serial number
to ensure getting the correct kit part number and cor-
rect parts.
Do not
atteMpt to servIce wIthout a
repack/InspectIon kIt & suppleMental InstructIons.
!