V Dual Seal Plunger
 Key
Features
- Stroke Adjuster is made more compact and adjustment is simplified
with an internally threaded design. The positive locking device to
hold stroke length is readily accessible and easy to operate.
- The Pneumatic Piston and Fluid Plunger Assembly is guided at both
ends on TFE composite bearings ensuring concentric movement of the
plunger though the seals.
- The clearance between the return spring and plunger has been optimized
to eliminate any possible contact.
- A true double sealing arrangement is used so that secondary seal
containment is provided.
- Lubrication has been simplified with the use of synthetic grease.
The lubrication chamber is filled once over the life of the seals.
- The bleeder is equipped with a barbed fitting for plastic tubing
so that the fluid bled from the fluid chamber can be collected.
- Both the discharge and suction check valves have tough TFE composite
seats for long life and positive sealing.
- Threaded port after the secondary seal provides for the indication,
collection or containment of any seal leakage.
 Operation 
POWER STROKE:
As the CONTROLLER air or gas enters the PNEUMATIC DRIVE CYLINDER, the
PISTON-PLUNGER ASSEMBLY is driven down into the FLUID CHAMBER, displacing
fluid and compressing the RETURN SPRING. As the plunger displaces the
fluid, the rise in pressure closes the SUCTION CHECK VALVE and opens
the DISCHARGE CHECK VALVE. A precise amount of fluid, corresponding
to the stroke of the plunger, is discharged.
SUCTION STROKE:
When the air or gas is exhausted from the PNEUMATIC DRIVE CYLINDER the
RETURN SPRING forces the PISTON-PLUNGER ASSEMBLY to return to its original
position. The drop in pressure in the FLUID CHAMBER caused by the retraction
of the piston allows the spring loaded DISCHARGE CHECK VALVE to close
and the SUCTION CHECK VALVE to open so that the FLUID CHAMBER is again
filled and ready for the power stroke.
 Design
Philosophy
The Williams "V" Series pneumatic metering pumps are engineered
for PERFORMANCE, QUALITY, SAFETY, and SIMPLICITY.
PERFORMANCE
ACCURACY Our positive displacement plunger pumps can provide accuracies
to ±.5% satisfying API-675.
FLOW TURNDOWN
Since our metering pumps offer both stroke rate and stroke
length adjustment, flow turndown ratios as great as 100:1 can be achieved
exceeding the API-675 requirement.
PRESSURE
Because of the large area difference between the air/gas piston
and the plunger, our pumps can produce 10,000 PSI with only 100 PSI of
air/gas supply pressure.
CORROSION RESISTANCE
We have selected materials, such as 316 SS, ceramic,
elgiloy, TFE, etc., for both wetted and non wetted parts, that afford
us the maximum corrosion resistance. These materials satisfy the requirements
of such organizations as NACE and the FDA.
QUALITY
TESTING All pumps are performance tested prior to shipment.
RELIABILITY
Our quality assurance program insures the optimum in product
performance and life by controlling the products configuration through
all stages of design, engineering, production, assembly and test.
WARRANTY
We warrant both performance and manufacturing defects.
SAFETY
PNEUMATICS Unlike electrics, pneumatics provide an intrinsically safe
design at no extra cost.
MATERIALS
The corrosion resistant materials used in the entire pump
minimize the damage that could occur during a chemical spill.
LOCATION
Pneumatics and corrosion resistant materials allow our products
to be used in harsh environments where wet/corrosive vapors or salt air
is present.
SIMPLICITY
SIZE The pneumatic design concept provides a compact design much smaller
than the comparable electrically driven pump.
INSTALLATION
The compact design allows the pumps to be installed directly
in the piping with minimum support, thus eliminating the need for concrete
pads.
MAINTENANCE
The pneumatic design approach limits the number of parts
thus simplifying and minimizing maintenance.
 Performance
* This data should only be used to provide you with your initial size
selection. You must refer to the actual performance graphs in order to
verify your pump selection.
 Application
When sizing and applying Williams plunger pumps please use the following
information to guide your selection:
PLEASE NOTE THAT OUR PLUNGER PUMPS HAVE PRESSURE-ACTIVATED SEALS. THEY
SHOULD NOT BE USED AT PRESSURES BELOW 100 PSI.
STROKE RATE AND LENGTH
Even though the pumps are designed to operate over their entire stroke
rate and length ranges, we suggest that you take into consideration
your future flow requirements. Rather than operating at the flow extremes
you may wish to use the next pump size larger or smaller.
FILTRATION
Plunger pumps are susceptible to contamination. Therefore we recommend
a 25 micron filter in the suction line of the pump.
SUCTION CONDITIONS
The V Series plunger pumps are designed for flooded suction only. They
are NOT recommended for a suction lift condition. The recommended pressure
at the suction inlet is:
1 ft. (.3 meters) min. * 10 ft. (3 meters) max.
NOTE: The normal cracking pressure of the discharge check valve is 90
PSI.
VISCOSITY
The maximum recommended viscosity is 4500 SSU (Saybolt Seconds Universal)
or 960 CP (Centipoise).
FLOW TURNDOWN RATIO: 100:1
NOTE: The flow turndown ratio is defined as the total flow range of the
pump, which includes both speed and stroke length adjustments.
ACCURACY
± 0.5% with Solenoid Valve and WPC-9001 ± 1.5% with MK-X
Controller
TEMPERATURE
The seals are the limiting factor. Please refer to the seal selection
guide for temperature limits.
AIR/GAS SUPPLY
The air/gas supply must always be regulated since fluctuating pressures
will affect speed and accuracy. The air/gas must be free from particulate
and we recommend dry air/gas for trouble free operation.
PUMP SETTING GAUGE
We recommend the use of a pump setting gauge as a simple method of adjusting
the flow of the pump.
DISCHARGE LINE CHECK VALVE
It is good design practice to install a check valve in the pump discharge
line at the point it enters the process line. This will prevent the
process fluid from reaching the pump.
 Literature
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