Williams Air-Driven Metering Pumps
The Williams metering pump seriesThe Williams pump range consists of 4 series, with up to 10 sizes each.
1. V&X series: Dual seal plunger pumps
2. W series: High flow, high pressure plunger pumps
3. LD series: Low pressure diaphragm pumps
4. Wilroy series: Hydraulically actuated diaphgragm pumps
V&X series: Dual seal plunger pump Features
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Stroke Adjuster is made more compact and adjustment is simplified
with an internally threaded design. The positive locking deviceto hold stroke length is readily accessible and easy to operate. The Pneumatic Piston and Fluid Plunger Assembly is guided at bothends on TFE composite bearings ensuring concentric movement ofthe plunger through the seals. The clearance between the return spring and plunger has beenoptimized to eliminate any possible contact. A true double sealing arrangement is used so that secondaryseal 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 bledfrom the fluid chamber can be collected. Both the discharge and suction check valves have tough TFE composite seats for longlife and positive sealing. Threaded port after the secondary seal provides for the indication, collection orcontainment of any seal leakage.
Operation
Power stroke
Suction stroke
Power strokeAs 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 strokeWhen 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.
W series: High flow, high pressure plunger pump 
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Features
Standard materials
Wetted parts - 316 SS
Plunger - 316 SS
Controller - MK-X - 316 SS
Relays - 316 SS
Seal materials
Teflon Graphite (TG) for pressures of 1000 to 10,000 PSIG
O-Ring seals are available for pressures below 900 PSIG in
various materials, K-Kalrez®, V-Viton® and BR-Buna N,
EPR-Ethylene Propylene
Viscosity
Maximum recommended viscosity 4500 SSU (Saybolt Seconds Universal) or
960 CP (Centipoise)
Operation
Powerstroke
As the supply air/gas from the controller relay enters the pneumatic drive cylinder thru the power stroke port, the piston-plunger assembly is driven down into the fluid cylinder, displacing fluid. The fluid displacement results in an increase in pressure which 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/gas is exhausted from the top portion of the pneumatic drive cylinder through the controller-relay, air/gas is then supplied to the bottom portion of the pneumatic drive cylinder in order to return the piston-plunger to its original position. The drop in pressure caused by the retraction of the piston-plunger assembly allows the discharge check valve to close, and the suction check valve to open. The fluid chamber is then refilled and ready for the power stroke.
PowerstrokeAs the supply air/gas from the controller relay enters the pneumatic drive cylinder thru the power stroke port, the piston-plunger assembly is driven down into the fluid cylinder, displacing fluid. The fluid displacement results in an increase in pressure which 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/gas is exhausted from the top portion of the pneumatic drive cylinder through the controller-relay, air/gas is then supplied to the bottom portion of the pneumatic drive cylinder in order to return the piston-plunger to its original position. The drop in pressure caused by the retraction of the piston-plunger assembly allows the discharge check valve to close, and the suction check valve to open. The fluid chamber is then refilled and ready for the power stroke.
Design philosophy
The Williams "W" 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 3,450 PSI (238 BAR) with only 150 PSI (10.3 BAR) of air/gas supply pressure.
Corrosion resistance
We have selected materials, such as 316 SS, elgiloy, TFE, etc., for both wetted and non wetted parts, that afford 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 warranty both performance and manufacturing defects.
Safety
Pneumatics
Unlike electrics, pneumatics provides 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 mounting pads.
Maintenance
The pneumatic design approach limits the number of parts thus simplifying and minimizing maintenance.
The Williams "W" Series pneumatic metering pumps are engineered for performance, quality, safety and simplicity.
Performance AccuracyOur positive displacement plunger pumps can provide accuracies to ±.5% satisfying
API-675.
Flow turndownSince 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.
PressureBecause of the large area difference between the air/gas piston and the plunger, our pumps can produce 3,450 PSI (238 BAR) with only 150 PSI (10.3 BAR) of air/gas supply pressure.
Corrosion resistanceWe have selected materials, such as 316 SS, elgiloy, TFE, etc., for both wetted and non wetted parts, that afford the maximum corrosion resistance. These materials satisfy the requirements of such organizations as NACE and the FDA.
Quality TestingAll pumps are performance tested prior to shipment
ReliabilityOur 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.
WarrantyWe warranty both performance and manufacturing defects.
Safety PneumaticsUnlike electrics, pneumatics provides an intrinsically safe design at no extra cost.
MaterialsThe corrosion resistant materials used in the entire pump minimize the damage that could occur during a chemical spill.
LocationPneumatics and corrosion resistant materials allow our products to be used in harsh environments where wet/corrosive vapors or salt air is present.
Simplicity SizeThe pneumatic design concept provides a compact design much smaller than the comparable electrically driven pump.
InstallationThe compact design allows the pumps to be installed directly in the piping with minimum support, thus eliminating the need for concrete mounting pads.
MaintenanceThe pneumatic design approach limits the number of parts thus simplifying and minimizing maintenance.
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. The 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 W 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.
Amplification ratio
The amplification ratio is the area difference between the air piston and the fluid plunger.
To ensure a longer operational life of the pump, it is important not to use a greater air supply pressure than is necessary to provide positive chemical injection. Assuming a specific amplification ratio, the air supply pressure must be regulated to ensure that the pump discharge pressure is greater than the process pressure. In calculating the proper air supply pressure, add 200 PSI (13.8 BAR) to the process pressure, then divide by the amplification ratio.
Example
Assume a process pressure of 2800 PSI (193 BAR) (process pressure is the pressure into which the chemical is injected).
Add 200 PSI to the process pressure so that the chemical is positively injected: 2800 PSI + 200 PSI = 3000 PSI (193 BAR + 13.8 BAR = 206.8 BAR).
Assume using a Williams pump with an amplification ratio of 23:1 (implies that for every 1 PSI (1 BAR) input pressure, the pump produces 23 PSI (23 BAR) output pressure).
Supply of air or gas pressure to controller is: 3000 ÷ 23 = 130 PSI (206.8 BAR ÷ 23 = 9 BAR)
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. The should not be used at pressures below 100 Psi.
Stroke rate and lengthEven 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.
FiltrationPlunger pumps are susceptible to contamination. Therefore we recommend a 25 micron filter in the suction line of the pump.
Suction conditionsThe W 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.
ViscosityThe maximum recommended viscosity is 4500 SSU (Saybolt Seconds Universal) or 960 CP (Centipoise).
Flow turndown ratio: 100:1Note: 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.
TemperatureThe seals are the limiting factor. Please refer to the seal selection guide for temperature limits.
Air/gas supplyThe 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 gaugeWe recommend the use of a pump setting gauge as a simple method of adjusting the flow of the pump.
Discharge line check valveIt 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.
Amplification ratioThe amplification ratio is the area difference between the air piston and the fluid plunger.
To ensure a longer operational life of the pump, it is important not to use a greater air supply pressure than is necessary to provide positive chemical injection. Assuming a specific amplification ratio, the air supply pressure must be regulated to ensure that the pump discharge pressure is greater than the process pressure. In calculating the proper air supply pressure, add 200 PSI (13.8 BAR) to the process pressure, then divide by the amplification ratio.
ExampleAssume a process pressure of 2800 PSI (193 BAR) (process pressure is the pressure into which the chemical is injected).
Add 200 PSI to the process pressure so that the chemical is positively injected: 2800 PSI + 200 PSI = 3000 PSI (193 BAR + 13.8 BAR = 206.8 BAR).
Assume using a Williams pump with an amplification ratio of 23:1 (implies that for every 1 PSI (1 BAR) input pressure, the pump produces 23 PSI (23 BAR) output pressure).
Supply of air or gas pressure to controller is: 3000 ÷ 23 = 130 PSI (206.8 BAR ÷ 23 = 9 BAR)
LD series: Low pressure diaphragm pump 
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Simple design Easy to maintain Intrinsic safety of pneumatic operation Stroke length and stroke rate adjustment High flow turndown Corrosion resistant construction All 316 SS or TFE wetted parts Ease of installation Recommended for discharge pressures below 120 PSI Standard materials Wetted Parts - 316SS or TFE Pneumatic Section - 316SS Diaphragm - TFE (Teflon) Controller - 316SS Relays - 316SS Design improvements Higher flow rates than PD series pump models All TFE diaphragms for all pump sizes TFE-coated o-rings in contact with process fluid Viton® o-rings in contact with air/gas supply Stroke Adjuster locks in place with a simple thumbscrew Stroke Adjuster scale easier to read and set than previous diaphragm pump models Check Valves for 316SS models have TFE soft seats with 316SS balls. (LD200 & 400) Check Valves for TFE models have TFE soft seats with Zirconium balls. (LD200 & 400) Check Valves on LD100 models are Kynar with Kynar soft seats and Zirconium orRuby Sapphire balls
Operation
Powerstroke
As the air or gas enters the motor chamber from the controller, the diaphragm is driven into the fluid cavity of the faceplate, displacing the fluid in the faceplate and extending the return spring. As the fluid is displaced, 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 diaphragm is discharged.
Suction stroke
When the air or gas pressure is exhausted from the motor chamber, the return spring assists the diaphragm in returning to its static position.The retraction of the diaphragm reduces the pressure in the fluid cavity, thus closing the discharge check valve and opening the suction check valve. The fluid cavity is again filled, preparing the pump for another power stroke.
PowerstrokeAs the air or gas enters the motor chamber from the controller, the diaphragm is driven into the fluid cavity of the faceplate, displacing the fluid in the faceplate and extending the return spring. As the fluid is displaced, 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 diaphragm is discharged.
Suction stroke When the air or gas pressure is exhausted from the motor chamber, the return spring assists the diaphragm in returning to its static position.The retraction of the diaphragm reduces the pressure in the fluid cavity, thus closing the discharge check valve and opening the suction check valve. The fluid cavity is again filled, preparing the pump for another power stroke.
Performance
Viscosity
Maximum recommended viscosity 1280 CP (Centipoise) or 6000 SSU
(Saybolt Seconds Universal).
Static suction lift: (Inches of Water)
The maximum volume of the pumps is reduced under a suction lift condition. The maximum suction lift capability for each pump is 60 inches. (with the footvalve on the tank end of a rigid suction line.)
Operating temperature
The recommended operating temperature of the pumps with the corresponding faceplate and standard diaphragm material is as follows:
316 SS: -15°F (-26°C) to 185°F(85°C)
TFE: -15°F (-26°C) to 185°F (85°C)
For temperatures beyond these limits, please consult the factory.
Max flow rate at 60" lift with foot valve:
LD100-TFE-TFE 0.7GPH (2.6LPH)
LD200-TFE-TFE 9.7GPH (36.7LPH)
LD400-TFE-TFE 45.0GPH (170.3LPH)
ViscosityMaximum recommended viscosity 1280 CP (Centipoise) or 6000 SSU
(Saybolt Seconds Universal).
Static suction lift: (Inches of Water)The maximum volume of the pumps is reduced under a suction lift condition. The maximum suction lift capability for each pump is 60 inches. (with the footvalve on the tank end of a rigid suction line.)
Operating temperatureThe recommended operating temperature of the pumps with the corresponding faceplate and standard diaphragm material is as follows:
316 SS: -15°F (-26°C) to 185°F(85°C)
TFE: -15°F (-26°C) to 185°F (85°C)
For temperatures beyond these limits, please consult the factory.
Max flow rate at 60" lift with foot valve:LD100-TFE-TFE 0.7GPH (2.6LPH)
LD200-TFE-TFE 9.7GPH (36.7LPH)
LD400-TFE-TFE 45.0GPH (170.3LPH)
Wilroy series: Hydraulically actuated diaphragm pump
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Williams and Milton Roy have combined technologies to design a pump, blending the proven mRoy® hydraulic by-pass diaphragm design with the Williams "V" Series pump. The result is the low volume, high turndown characteristics of a pneumatic drive coupled with the chemical containment and high pressure capabilities of a hydraulically actuated diaphragm.
The WilRoy is a hydraulically actuated diaphragm pump which delivers chemical containment, low maintenance and overpressurization protection with unsurpassed accuracy and repeatability.
This entirely new pump is available with your choice of either a .25” or a .5” plunger along with these great features:
316 SS exposure
Integral relief valve
Maintenance-free hydraulic system
Two sizes in one housing— Field reconfigurable
Compact size for ease of installation
Centralized design for ease of maintenance and operation
Gylon® diaphragm for diverse compatibility
Optimum chemical containment
Please contact Delta Controls Velsen B.V. for more detailed information.
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