DeZURIK
Willamette VBL-2600 Ball Valves
D12001 Page 4December 2012
Description (Metal Seated Valves)
General
The Willamette VBL-2600 Ball Valve is a plug type, quarter-turn valve with a full-ported circular
waterway through the body and ball plug in the open position. Each ball valve consists of four (4) main
elements: A pressure vessel (body), a rotatable closing element (ball), a torque unit, and an operator.
The "Standard" materials of construction for the body and ball are ductile iron (Ball valve construction is
in complete accordance with AWWA standard C507-11 for ball valves 6-inches through 60-inches with
metal seats per section 4.2.2.2.
Body
The "Standard" body has ANSI B16.1 CL125 or CL250 flanges and houses the ball. The body has
integrally cast trunnions and provides rigid means for supporting the torque unit (without the necessity
of additional supports). There are two (2) pipe connections, one for an air vent and the other for drain.
The body has rigidly attached corrosion resistant metal seat(s). Maximum seat bearing pressure does
not exceed 1,000 lbs/sq inch.
Ball
The ball has bronze bushed trunnions. An extension of one trunnion, called the operating shaft, passes
through a sealing device (O-ring retainer) and connects to the torque unit. The operating shaft is
stainless steel. The sealing device is capable of being removed and having its seaIs replaced without
removing the valve from the line.
The ball has corrosion resistant metal seat(s) rigidly attached and fully adjustable to provide drop-tight
sealing in one direction or both directions, as an option. The ball shaft is designed for a factor of safety
for all combined stresses of at least five to one. Maximum deflection does not exceed 1/6 degree per
foot of unsupported length using a seat coefficient of friction of 0.5 and a bearing coefficient of friction of
0.3.
Torque Unit (Valve Operating Mechanism)
The torque unit employs a traveling crosshead to impart positive rotary movement to the ball by means
of a link and lever connected to the ball shaft. A ball shaft support bearing is supplied on the cover. The
torque unit is designed such that during the first 50 percent of stroke in closing, the flow area is reduced
by approximately 81 percent. The remaining flow area is gradually reduced to a complete shutoff
throughout the last 50 percent of closing stroke. All materials of the torque unit subject to rubbing are of
different hardness. The torque unit is capable of being inspected, lubricated, removed and repaired
without removing the valve from the pipeline.
Handling and Storage
Lifting the valve improperly may damage it. Do not fasten lifting devices to the actuator, ball or through
the seat opening in the body. Lift the valve with slings, chains or cables fastened around the valve
body, or fastened to bolts or rods through bolt holes in the flanges.
If installation will be delayed, place valve indoors in secure, weather tight storage. If temporary outside
storage is unavoidable, make sure a vermin proof rain cover (water shedding tarp, etc.) is secured
around/over the equipment to keep off rain and mud. Skid and set the assembly on a flat, solid, and
well drained surface for protection from ground moisture, runoff and pooled rain water.
