SMC Networks PAX1 12 Series User manual

Doc. no. PAB-OM-B005-A
PRODUCT NAME
Process Pump
MODEL / Series / Product Number
PAX112 Series

1
Contents
Safety Instructions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -P.2 to 3
Names and functions of parts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.4
Precautions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.5 to 10
Applicable Fluids - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.11
Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.12
Performance Curve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.13 to 14
Working Principle - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.15
Maintenance Parts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.16
Piping and Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.16
Dimensions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - P.17

2
Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment
damage.
These instructions indicate the level of potential hazard with the labels of “Caution,” “Warning”
or “Danger.”
They are all important notes for safety and must be followed in addition to International
Standards (ISO/IEC)1), and other safety regulations.
1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines.(Part 1: General requirements)
ISO 10218-1992: Manipulating industrial robots -Safety.
etc.
Caution
Caution indicates a hazard with a low level of risk which, if not avoided, could result
in minor or moderate injury.
Warning
Warning indicates a hazard with a medium level of risk which, if not avoided, could
result in death or serious injury.
Danger
Danger indicates a hazard with a high level of risk which, if not avoided, will result
in death or serious injury.
Warning
1. The compatibility of the product is the responsibility of the person who designs the
equipment or decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results.
The expected performance and safety assurance of the equipment will be the responsibility of the person who
has determined its compatibility with the product.
This person should also continuously review all specifications of the product referring to its latest catalog
information, with a view to giving due consideration to any possibility of equipment failure when configuring the
equipment.
2. Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment including our products must be
performed by an operator who is appropriately trained and experienced.
3. Do not service or attempt to remove product and machinery/equipment until safety is
confirmed.
1. The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent falling or runaway of the driven objects have been confirmed.
2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3. Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of safety measures if the product is
to be used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or use outdoors or in a place exposed to
direct sunlight.
2. Installation on equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special safety
analysis.
4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a
mechanical protective function, and periodical checks to confirm proper operation.
-2-

3
Safety Instructions
Caution
1.The product is provided for use in manufacturing industries.
The product herein described is basically provided for peaceful use in manufacturing industries.
If considering using the product in other industries, consult SMC beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited warranty and Disclaimer/Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance
Requirements”.
Read and accept them before using the product.
Limited warranty and Disclaimer
1. The warranty period of the product is 1 year in service or 1.5 years after the product is
delivered, whichever is first.2)
Also, the product may have specified durability, running distance or replacement parts.
Pleaseconsult your nearest sales branch.
2. For any failure or damage reported within the warranty period which is clearly our
responsibility, a replacement product or necessary parts will be provided.
This limited warranty applies only to our product independently, and not to any other damage
incurred due to the failure of the product.
3. Prior to using SMC products, please read and understand the warranty terms and
disclaimers noted in the specified catalog for the particular products.
2) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum
pad or failure due to the deterioration of rubber material are not covered by the limited
warranty.
Compliance Requirements
1. The use of SMC products with production equipment for the manufacture of weapons of
mass destruction(WMD) or any other weapon is strictly prohibited.
2. The exports of SMC products or technology from one country to another are governed by the
relevant security laws and regulation of the countries involved in the transaction. Prior to the
shipment of a SMC product to another country, assure that all local rules governing that
export are known and followed.
Return of Product
If the product to be returned is contaminated or is possibly contaminated with substances that
are harmful to humans, for safety reasons, please contact SMC beforehand and then employ a
specialist cleaning company to decontaminate the product. After the decontamination
prescribed above has been carried out, submit a Product Return Request Sheet or the
Detoxification/Decontamination Certificate to SMC and await SMC’s approval and further
instructions before attempting to return the item.
Please refer to the International Chemical Safety Cards (ICSC) for a list of harmful substances.
If you have any further questions, please don’t hesitate to contact your SMC sales
representative.

4
Names and functions of parts
Description
Functions
Suction port (FLUID IN)
Sucks the fluid to be transferred. Connect suction piping.
Discharge port (FLUID
OUT)
Discharges the fluid taken in the pump. Connect discharge piping.
Pilot air supply port
(AIR SUP)
Supplies air of set pressure. Connect the air piping.
Pilot air exhaust port
(AIR EXH)
Exhausts pilot air.
Reset button
Resets the pump when operation is stopped.

5
Precautions
1. Precautions for system design
Warning
1. Confirm the specifications.
- Give careful consideration to operating conditions such as the application, fluid and environment,
and use the product within the operating ranges specified in this catalog.
- The product is provided for physical, chemical and industrial equipment.
2. Fluids
- For the compatibility between the materials composing the product and the fluids, check the
compatibility check list. Since the compatibility of the fluid used may vary depending on its type,
additives, concentration, temperature, etc., give sufficient consideration when selecting the
material.
- For fluids other than those listed on the check list, please consult us.Also, use them within the
range of the operating fluid temperatures.
- If foreign matters are mixed in the fluid, these may cause abrasion of the inside of the pump
resulting in a problem. Use an appropriate filter (strainer) to remove them. In general, 80 to 100
mesh (150 to 180 μm) filters are recommended.
- When transferring a coagulable liquid, take measures to prevent it from coagulating in the pump.
- Precautions to observe when transferring slurry
Basically, it is not recommended to transfer slurry because this will result in seating failure and
wearing of the check valve and accumulation of particles. However, if you intend to increase the
number of maintenance cycles even though this promotes wear and accumulation of particles,
use a suction lift of no more than 1 m and also a slurry containing solid particles of the following
diameter.
If the specific gravity of the slurry is less than 3, use particles that have a diameter of no more
than ø0.25 mm and have been passed through a #60 or finer mesh (e.g. aluminum powder).
If the specific gravity of the slurry is 3 or more, use particles that have a diameter of no more
than ø0.15 mm and have been passed through a #100 or finer mesh (e.g. iron powder)
- Take countermeasures to prevent the operating fluid from getting onto the body of the process
pump.
3. Water hammer
If a valve is operated abruptly etc., a high pressure may be applied due to water hammer. Take
measures to prevent pressures higher than specified from being applied.
<Examples of measures>
- Use a water hammer resistant valve to reduce the valve closing speed.
- Use an elastic piping material such as rubber hose or an accumulator to absorb the impact
pressure.
4. Liquid seals
To ensure that fluid does not become sealed inside the process pump, when
stopping the pump, relieve the discharge pressure inside it. As shown in the
figure at right, make a circuit which has a relief valve installed on the
system.
5. Fluid pressure supplied to the process pump
Feeding the fluid from the suction side into the pump under pressure, or
drawing it using a negative pressure, will reduce the life of the pump.
6. Ensure space for maintenance.
Secure the space required for maintenance and inspection. Take into consideration also leakage
from the product. When transferring a flammable liquid or a liquid that may affect the human body
or environment, take measures including fire ban and keeping the area off limits.
7. Use a design which prevents reverse pressure and reverse flow.
If reverse pressure or reverse flow occurs on the discharge side of the process pump, the
equipment is liable to become damaged or malfunction. Take safety measures in designing the
circuit.
8. Measures against static electricity
Take measures against static electricity as static electricity may occur depending on the fluid.
Particularly, when circulating flammable fluid through the pump, be sure to take measures to
prevent the occurrence of static electricity.

6
9. The pump cannot transfer gas. Do not allow it to idle for a long time.
If the pump is operated for a long time without any fluid inside or in a gas-fluid mixed state, the
diaphragm may be damaged or the life may be shortened. Do not continue idling for 3 minutes or
longer.
10. Condensation and freezing of the pilot port
The location around the switching valve and the air exhaust port can cool down quickly due to
expansion of the supply air, and this may cause condensation on the piping and the condensation
may freeze during operation in winter. Take measures to ensure that water droplets from
condensation are not splashed onto any electric parts or equipment.
11. Condensation and freezing of the directional control valve
Condensation and freezing may occur in the directional control valve due to the same cause as
10. Condensation and freezing of the pilot port. In this case, decrease the dew point of the supply
air, decrease the pilot air pressure, or reduce the discharge air.
Caution
1. Suspension of the pump operation
When operation is stopped exhaust the residual pressure of the air supply port using the 3-port
solenoid valve. Stopping the process pump while air is supplied, load is applied to the internal
parts and the life will be shortened. If the process pump is stopped consuming the residual
pressure, the operation of the switching part of the pilot air in the process pump becomes
unstable and may not be restarted. When the operation cannot be restarted, press the reset
button or supply air to the air operated reset port.
2. Use the constant pilot air pressure.
The automatically operated type of some models adopts an air spring for the built-in air control
circuit, and the pump may malfunction and stop when the pilot air pressure fluctuation exceeds 50
kPa.
3. Reverse flow
The check valve inside the process pump does not completely stop reverse flow (the flow from
the discharge side to the suction side). For this reason, fluid may sometimes flow from the
discharge side to the suction side when the pump is stationary, etc).As a countermeasure, install
a 2-way valve or a check valve. However, please note that when a check valve is installed, if the
cracking pressure is high, defective suction may occur. (As a guide, the cracking pressure should
be 0.02 MPa or less.)

7
2. Mounting
Caution
1. Read the operation manual before mounting the product.
Read the operation manual carefully and understand the contents before mounting the product.
The manual should also be kept where it can be referred to whenever necessary.
2. Confirm the mounting orientation of the product.
Mount the pump on a horizontal surface only. Mount the product so that the reset button faces
upward. (Refer to Figure 1) There are 4 mounting holes with M8 threads. Ensure that the product
is mounted with 4 screws. The product can also be held by M6 hexagon socket head cap screws
(4pcs.) by removing the resin cover as shown in Fig.2. (Refer to Figure 3) In this case, the M8
threads are considered as through holes.
Ensure that the resin cover is remounted correctly after mounting the pump.
If the propagation of the vibration of the pump is not acceptable, insert vibroisolating rubber when
mounting.
Figure 2
Remove the 4 cross
recessed round head
screws and remove
the resin cover by
pulling it upward.
Cross recessed
round head screw
Resin cover
Figure 3
Hexagonal bolt M6
After mounting the pump,
ensure that the resin
cover is remounted.
Resin cover
Reset button
Figure 1

8
3. Piping
Caution
1. Flush the piping.
Flush and clean the piping before connecting the product. Any dirt or scale and the like left in the
piping may cause malfunction or failure.
2. Tighten screws with proper tightening torque.
When screwing fittings into the product, tighten them with proper tightening torque as shown
below. Looseness can cause problems such as fluid and air leaks, while over tightening can
cause damage to threads and parts, etc.
Connection thread
Proper tightening torque (N·m)
Rc, NPT, G, PNTF 1/4”
12 to 14
Rc, NPT, G, PNTF 3/8”
22 to 24
4. Air Supply
Warning
1. Use clean air.
Do not use compressed air that includes chemicals, synthetic oils containing organic solvents,
salinities or corrosive gases, etc., as it can cause damage or malfunction.
2. Pay attention to avoid freezing when operating the product in low temperatures.
The equipment operates while expanding the compressed air. During this time, the temperature
inside the product decreases due to adiabatic expansion. If the ambient temperature is low, using
compressed air containing a lot of moisture may cause freezing because heat cannot be gained
from the surroundings. In this case, take freeze prevention measures by using a membrane air
dryer (such as series IDG).
Caution
1. Quality of operating air
- Use air filtered by air filter AFF series or mist separatorAM series, etc. Use the water separator
(AMG, etc.) when necessary. Use of a super mist separator (such as series AME) is
recommended to extend maintenance intervals. (Equivalent to No. C to E on the page P2 to 3
of Best Pneumatics 6.
- Use of humid air may cause condensation inside the body. Use air which has been treated by a
refrigerated air dryer (such as IDF series) when condensation occurs.
-When dew forming or freezing occur in the process pump, use the membrane air dryer (IDG)
and decrease the dew point of supply air.
- If a pump is operated by super dry air and N2 gas, etc., the deterioration of the gaskets inside
the switching valve will be accelerated and may result in substantially shortening the life span of
the product.
5. Operating environment
Warning
1. Do not use in the following environments, as this can cause failure.
1) Locations with an atmosphere of corrosive gases, organic solvents or chemical solutions, and
where there may be contact with the same.
2) Locations where there is contact with sea spray, water or steam.
3) Locations where ultraviolet deterioration or overheating of resin may occur due to direct
sunlight.
4) Locations near heat sources with poor ventilation (heat sources should be shielded by heat
insulating material).
5) Locations with impact or vibration.
6) Locations with excessive moisture and dust.
2. The product cannot be used under water.
Do not use the product immersing it in water (liquid). Otherwise, liquid will enter the openings
inside the product, resulting in malfunction.
3. Compressed air with low dew point
Using super dry air as the fluid may affect the reliability (service life) of the equipment, because
the lubrication characteristics inside the equipment will deteriorate. Please consult with SMC
when using it.

9
6. Maintenance
Warning
1. Perform maintenance after consulting the operation manual.
Obtain the operation manual for the equipment from SMC or our distributor and have sufficient
knowledge of the equipment before performing maintenance. Incorrect handling may cause
damage or malfunction of the equipment or system.
2. Perform maintenance work after confirming the safety of the system.
Turn off the compressed air and power supply and exhaust any remaining compressed air in the
system before removing the equipment and the compressed air supply/exhaust unit. Discharge
the residual liquid or sufficiently displace it as necessary. Also, when reinstalling the equipment or
restarting it after replacement, confirm the safety of the product before checking that it operates
normally.
3. Use appropriate protective equipment.
When touching the process pump for maintenance, wear protective equipment such as gloves
which are compatible with the fluid used. There is a risk of chemical burns.
4. Do not disassemble the product, as disassembly will invalidate the product's
warranty.
When disassembly is necessary, please consult with SMC or our distributor.
5. Drain discharge
Operating the system with drain accumulated in the equipment or piping may cause malfunction
of the equipment, splash over into the downstream side, or unexpected accident. Periodically
discharge drain from components including the air filter.
6. Caution when transferring a high-temperature fluid
The product itself will become hot due to the high-temperature fluid. Since touching the product
directly may cause burns, allow sufficient time for the product to cool down when transferring a
high-temperature fluid. The measurement of the product temperature is recommended to confirm
the safety of the system before performing work.
Caution
1. Caution when transferring a highly penetrating liquid
When transferring a liquid that is highly penetrating through fluoropolymer, components of the
transfer liquid may enter the openings inside the equipment.Also, they may become attached to
the external surface of the equipment. In this case, take the same measures as handling the
transfer liquid.
2. Service life of diaphragm and maintenance of consumable items
- Disassembly of the process pump is not recommended. Replacement with new process pump
based on the reference life of the diaphragm is recommended.
- If the operating cycle of the process pump exceeds the service life of diaphragm, the diaphragm
may be damaged due to deterioration. If it is damaged, the fluid will leak from the pilot air
exhaust port and the air will blow out into the liquid circuit. Consider the pump operation
(breathing, decline of discharge pressure, etc.) and the reference service life of diaphragm, and
replace with new process pump or conduct necessary maintenance as early as possible.
- Items such as check valves, switching valves, pilot valves and manual caps may experience
malfunction earlier than the diaphragm depending on the operating conditions. Please replace
with new process pump or conduct periodic maintenance.
- When conducting maintenance, obtain the necessary parts indicated in the maintenance parts
list (Refer to P.16), and perform work according to the maintenance and operation manuals.
[Calculation of reference service life (days) of diaphragm]
Reference Service
life (days)
=
A (amount of discharge per cycle) x B (reference number of cycles in
service life)
Flow (L/min) x Operating time per day (hour) x 60 (min)
Model
Operating
conditions:
Method
Diaphragm
material
Amount
of discharge
per cycle A
Reference number
of cycles
in service life B
Volume
inside pump
(wetted part)
PAX1□12
Automatically
operated type
PTFE
Approx. 0.021L
50 million cycles
Approx. 90mL

10
3. Please understand the following concerning the inability to repair the product.
To enable the process pump to be used with various fluids, please note that from the aspects of
ensuring worker safety and also the facilities, SMC is unable to carry out repair.
7. Caution on Handling
Caution
1. If lubricating a pump, use turbine oil (ISO VG 32), and be sure to continue lubricating the
pump.
Warning
1. Test before using with the actual equipment.
Test the pump before using it with the actual equipment. Even if there is no problem in a
short-term test, the liquid may penetrate through the fluoropolymer diaphragm causing
malfunction in the pump air circuit.
2. Storage
In the case of long-term storage after use, first thoroughly remove the liquid, and clean and dry
the inside to prevent deterioration of the pump materials.
3. After a long period of non-use, perform a trial run prior to operation.

11
Applicable Fluids
Material and Fluid Compatibility Check List for Process Pumps
- The data below is prepared based on data provided by the material manufacturers.
- SMC assumes no responsibility for the accuracy of the data or for any damages arising from the
data.
- The material and fluid compatibility check list provides reference values as a guide only; therefore
SMC does not guarantee the application to our product.
Caution
1. Select the wetted parts materials according to the transfer liquid you use to determine the model.
- For the diaphragm material, PTFE is suitable for non-permeating liquids.
- Use fluids that will not corrode the wetted parts materials.
2. These products are not suitable for medical or food use.
3. The applicability may vary depending on additives. Take note also of additives.
4. The applicability may vary depending on impurities. Take note also of impurities.
5. Examples of transfer liquids are shown below. Since the applicability may vary depending on your
operating conditions, be sure to check it by means of experimentation.
6. Compatibility is indicated for fluid temperatures specified for the respective products (60°C or
less).
Note 1) Static electricity may be generated. Take measures to prevent static electricity.
Caution
Caution for transferring highly penetrating liquids
Do not use liquids which are highly penetrating to fluorine resin. This may cause internal damage to
the process pump or liquid leakage.
Table symbols
○: Can be used. ×: Cannot be used. －: Can be used under certain conditions. Please consult us.
Model
PAX1112
PAX1212
Body material
ADC12
SCS14
Diaphragm material
PTFE
Examples of applicable liquids
Water
Tap water
×
○
Pure water
×
－
Oil
Turbine oil
○
Cutting oil
○
Brake oil
○
Solvent
Flux
×
○
Toluene
○Note 1)
Methyl ethyl ketone
×
○Note 1)
Acetone
×
○Note 1)
Inert solvent
×
○
Ethyl alcohol
○Note 1)
Isopropyl alcohol
×
○Note 1)
Sodium hypochlorite
×
Cleaning fluids
×
－
Acids
×
Alkalis
×
Metal corrosive liquid
×
Highly permeating liquid
×
Highly penetrating liquid
×

12
Specifications
Each value of above represents at normal temperatures with fresh water.
Model
PAX1112
PAX1212
Actuation
Automatically operated
Port size
Main fluid
suction
discharge port
Rc, NPT, G, NPTF 1/4”, 3/8" Female thread
Pilot air
supply/exhaust
port
Rc, NPT, G, NPTF 1/4" Female thread
Material
Body wetted
areas
ADC12
SCS14
Diaphragm
PTFE
Check valve
PTFE, SCS14
Discharge rate
0.5 to 10L/min
Average discharge pressure
0 to 0.6MPa
Pilot air pressure
0.2 to 0.7MPa
Air consumption
150 L/min (ANR) or less
Suction
lifting
range
Dry
Up to 2 m (Interior of pump dry)
Wet
Up to 6 m (liquid inside pump)
Noise
84 dB (A) or less (Option: with silencer, AN20)
Maximum withstand
pressure
1.05MPa
Diaphragm life
50 million times
Fluid temperature
0 to 60°C (No freezing, heat cycle not applied)
Ambient temperature
0 to 60°C (No freezing, heat cycle not applied)
Maximum viscosity
1000mPa･s
Weight
2.0 kg
3.5 kg
Mounting orientation
Horizontal (with mounting foot at bottom)

13
Performance Curve
Flow Rate Characteristics
Selection from Flow Rate Characteristic Graph (PA(P)3310)
Required specifications example:
Find the pilot air pressure and pilot air consumption for a discharge rate of 6 L/min and a discharge
pressure of 0.25 MPa. <The transfer fluid is fresh water (viscosity 1 mPa·s, specific gravity 1.0).>
If the total lifting height is required instead of the discharge pressure, a discharge pressure of 0.1
MPa corresponds to a total lift of 10 m.
Selection procedures:
1. First mark the intersection point for a discharge rate of 6 L/min and a discharge pressure of 0.25
MPa.
2. Find the pilot air pressure for the marked point. In this case, the point is between the discharge
curves (solid lines) for SUP = 0.4 MPa and SUP = 0.5 MPa, and based on the proportional
relationship to these lines, the pilot air pressure for this point is approximately 0.43 MPa.
3. Next find the air consumption. Since the marked point is below the curve for 50 L/min (ANR), the
maximum rate will be about 45 L/min (ANR).
Caution
1. These flow rate characteristics are for fresh water (viscosity 1 mPa·s, specific gravity 1.0).
2. Flow characteristic is measured based on necessary minimum piping.
3. The discharge rate differs greatly depending on properties (viscosity, specific gravity) of the fluid
being transferred and operating conditions (lifting range, transfer distance), etc.

14
Viscosity Characteristics (Flow rate correction for viscous fluids)
Selection from Viscosity Characteristic Graph
Required specifications example:
Find the pilot air pressure and pilot air consumption for a discharge rate of 2.7 L/min, and a viscosity
of 100 mPa·s.
Selection procedures:
1. First find the ratio of the discharge rate for fresh water when viscosity is 100 mPa·s from the
graph below. It is determined to be 45%.
2. Next, in the required specification example, the viscosity is 100 mPa·s and the discharge rate is
2.7 L/min. Since this is equivalent to 45% of the discharge rate for fresh water, 2.7 L/min ÷ 0.45 =
6 L/min, indicating that a discharge rate of 6 L/min is required for fresh water.
3. Finally, find the pilot air pressure and pilot air consumption based on selection from the flow
characteristic graphs.
Caution
Viscosities up to 1000 mPa·s can be used.
Viscosity and dynamic viscosity are obtained by the formulas below.
Dynamic viscosity ν[m2/s]＝
Viscosity μ[Pa･s]
Density ρ[kg/m3]
Formulas below can be used for common units
- 1cP = 1mPa･s = 10-3Pa･s
- 1cSt = 1mm2/s = 10-6m2/s
Pulsation Attenuating Capacity
The process pump generates pulsation because it discharges a liquid using two diaphragms. The
pulsation attenuator absorbs pressure when discharge pressure increases, and compensates the
pressure when discharge pressure decreases. By this means pulsation is controlled.

15
Working Principle
1. When air is supplied, it passes through the switching valve and enters drive chamber B.
2. Diaphragm B moves to the right, and at the same time diaphragmA also moves to the right
pushing pilot valve A.
3. When pilot valve A is pushed, air acts upon the switching valve, drive chamberA switches to a
supply state, and the air which was in drive chamber B is exhausted to the outside.
4. When air enters drive chamberA, diaphragm B moves to the left pushing pilot valve B.
5. When pilot valve B is pushed, the air which was acting upon the switching valve is exhausted,
and drive chamber B once again switches to a supply state.A continuous reciprocal motion is
generated by this repetition.
1. When air enters drive chamber B, the fluid in pump chamber B is forced out, and at the same time
fluid is sucked into pump chamber A.
2. When the diaphragm moves in the opposite direction, the fluid in pump chamberA is forced out,
and fluid is sucked into pump chamber B.
3. The pressure of the fluid that is forced out of the pump chamber is adjusted in the pulsation
attenuation chamber and is then exhausted.
4. Continuous suction and discharge is performed by the reciprocal motion of the diaphragm.
1. Pulsation is attenuated by the elastic force of the diaphragm and air in the pulsation attenuation
chamber.
2. When the pressure in the pulsation attenuation chamber rises, the change lever presses the
pulsation attenuator intake valve, and air enters the pulsation attenuator air chamber.
3. Conversely, when pressure drops, the change lever presses the pulsation attenuator exhaust
valve, exhausting the air from the air chamber
and keeping the diaphragm in a constant position. Note that some time is required for the
pulsation attenuator to operate normally.
Drive unit
Control unit
Pulsation attenuation chamber

16
Maintenance Parts
- It is not recommended to disassemble the process pump. However, if this is necessary,
be sure to follow the instructions in the maintenance procedure.
- When carrying out this work, wear appropriate protective equipment.
Description
PAX1□12
Diaphragm kit
KT-PAX1-31
Check valve kit
KT-PAX1-36
Switching valve parts kit
KT-PAX1-37#1
Pilot valve kit
KT-PA5-38
Pulsation attenuator control valve kit
KT-PAX1-39
Piping and Operation
Caution
Mount the pump so that the reset button faces upward.Air to be supplied to the air supply port <AIR
SUP> should be cleaned and filtered throughAF filter, etc. Air with foreign matter or drainage etc.
will have negative effects on the built-in directional control valve and will lead to malfunction. When
air needs additional purification, use a filter (AF series), and a mist separator (AM series) together.
Maintain the proper tightening torque for fittings and mounting bolts, etc. Looseness can cause
problems such as fluid and air leaks, while over tightening can cause damage to threads and parts,
etc.
Starting and Stopping Refer to circuit example (1)
1. Connect air piping to the air supply port <AIR SUP> and connect piping for the fluid to be
transfered to the suction port <FLUID IN> and the discharge port <FLUID OUT>.
2. Using a regulator, set the pilot air pressure within the range of 0.2 to 0.7 MPa. Then, the pump
operates when power is applied to the 3 port solenoid valve of the air supply port <AIR SUP>, the
sound of exhaust begins from the air exhaust port <AIR EXH> and fluid flows from the suction
port <FLUID IN> to the discharge port <FLUID OUT>.
At this time, the throttle on the discharge side is in an open state. The pump performs suction with
its own power even without priming. (Dry state suction lifting range: up to 2 m) To restrict exhaust
noise, attach a silencer (AN20-02: option) to the air exhaust port <AIR EXH>.
3. To stop the pump, exhaust the air pressure being supplied to the pump by the 3 port solenoid
valve of the air supply port <AIR SUP>. The pump will also stop if the throttle on the discharge
side is closed.
Discharge Flow Rate Adjustment
1. To adjust the flow rate from the discharge port <FLUID OUT>, use the throttle connected to the
discharge side. Refer to circuit example (1). Note that this product cannot be used as a fixed
quantity liquid dispense pump.
2. When operating with a discharge flow rate below the specification range, provide a by-pass circuit
from the discharge side to the suction side to ensure the minimum flow rate inside the process
pump. With a discharge flow rate below the minimum flow rate, the process pump may stop due
to unstable operation. Refer to circuit example (2). (Minimum flow rates: 0.5 L/min)
<Reset Button>
When the pump stops during operation, press the reset button. This makes it possible to restore
operation in case the switching valve becomes clogged due to foreign matter in the supply air.
Maintenance is necessary if the reset button needs to be pressed frequently.
Circuit example (1)
Circuit example (2)

17
Dimensions

18
Revision
9-Feb-1998
- Initial release
23-Dec-2019 Revision A
- Completely revised by format change.
4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101-0021 JAPAN
Tel: + 81 3 5207 8249 Fax: [phone]
URL https://www.smcworld.com
Note: Specifications are subject to change without prior notice and any obligation on the part of the manufacturer.
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