YAMADA DP-15 Series User manual

Doc. No. NDP 456U-05
OPERATION MANUAL
YAMADA AIR-OPERATED DOUBLE DIAPHRAGM PUMP
DP-15 series

1
·Introduction
Thank you for purchasing a Yamada Diaphragm Pump. This product is a positive-displacement pump that
transfers fluids by movement of diaphragms driven by compressed air through a unique switching
mechanism. The casing that comes in contact with the fluid is made of aluminum, stainless steel, forged
iron, polypropylene, Polyacetal, polyvinylidene fluoride depending on the model you have selected
according to the type of fluid to be pumped. The diaphragms are made of rubber-based or plastic-based
materials.
·For safe operation
This document contains information vital for safe and efficient operation of this product. Before using the
pump, be sure to read this document carefully, particularly the "warnings and cautions", and be fully
familiar with the operating procedures. Be sure to keep this document handy for future reference.

2
·Warnings and cautions
For safe use of this product, be sure to note the following: In this document, warnings and cautions are
indicated by symbols. These symbols are for those who will operate this product and for those who will be
nearby, for safe operation and for prevention of personal injury and property damage.
The following warning and caution symbols have the meanings described below. Be sure to remember
their meanings.
WARNING: If you ignore the warning described and operate the product in an
improper manner, there is danger of serious bodily injury or death.
CAUTION : If you ignore the caution described and operate the product in an
improper manner, there is danger of personal injury or property
damage.
Furthermore, to indicate the type of danger and damage, the following symbols are also used along with
those mentioned above:
This symbol indicates a DON'T, and will be accompanied by an explanation on something
you must not do.
This symbol indicates a DO, and will be accompanied by instructions on something you
must do in a certain situation.
·Operating caution
Before using this product
WARNING
· When using compressed gas (hereinafter called "compressed air") to drive this pump, be
sure it is one of the following:
* Compressed air supplied from an air compressor
* Nitrogen (N2) gas
Use of compressed air other than the above may cause air pollution, damage to the pump,
or even an explosion.
· Pressure Ratings are dependent on pump material and liquid temperature variations.
Please see “Temperature Pressure Curve” in the “10.1 Main Specification” and check for the
allowable working pressure at the specific temperature of the liquid being pumped. Air
pressure and discharge pressure must not exceed the allowable working pressure. If air
pressure and discharge pressure exceed the allowable working pressure, it may cause liquid
leaks, damaged pump casings or diaphragms and could cause a fatal accident.
· When moving this product, make sure that the internal pressure is released. If the pump is
moved while under pressure, any shock imparted by droppage, etc. may damage the pump
or even cause an explosion.
· Hazardous fluids (with strong acid or alkali, flammable or toxic) or gas bubbles generated
by such fluids may cause serious injury or even death if accidentally inhaled or consumed
or if they come into contact with the eyes or adhere to skin. Therefore, the following
precautions are strongly advised.
*Be fully familiar with the properties of the fluid to be pumped and work in strict
accordance with the operating instructions provided by the suppliers of such fluids (such
as wearing goggles, gloves, mask or work clothes).
*When storing a hazardous fluid, strictly comply with the regulatory procedures (such as
using proper containers, storage conditions, etc.).
*Always install the piping and exhaust port of this pump away from human and animal
traffic.

3
WARNING
· When a diaphragm is damaged, fluid will gush out together with air through the exhaust
port. Also when pump has positive suction head, liquid will be forced out from exhaust port
due to positive inlet pressure. Make sure to provide protective measures in consideration of
possible leakage of fluid (see NOTE: Arranging outside exhaust on P.9). For example using a
hose and pit etc., also be sure you are using a model with appropriate corrosion resistance
for the fluid to be pumped.
· When installing this product, be sure to connect a ground wire from the specified position of
this product.
When this product is installed and operated without the ground wire properly connected,
friction between parts, as well as abrasion caused by the flow of some fluids inside the
casing, may generate static electricity. Also, depending on the type of fluid being pumped
and the installation environment (such as gases in the air and type of surrounding
fixtures), static electricity could become a cause of fire or electric shock.
· Improper grounding, poor ventilation, or unshielded fire or spark can create a danger of fire
or explosion. Therefore, the following precautions are strongly advised.
*All peripheral equipment and piping connected to this product should be properly
grounded.
*To pump flammable liquids, use a model with an aluminum or stainless-steel casing.
*Whenever you notice any spark while operating this product, immediately stop it
operation, and do NOT start using it again unless you are sure of the cause and corrective
actions have been taken.
*Depending upon the type of fluid being pumped, bubbles of flammable gas may be
generated. Make sure that ventilation is satisfactory.
*This product itself, its piping and exhaust ports should be kept away from unshielded fire,
spark and other causes of ignition. If a diaphragm is damaged, fluid will gush out together
with air from the exhaust port.
*Do NOT leave gasoline or solvent etc. that contains waste at the work site.
*Machinery and other equipment near the place of installation of this product should be
properly insulated to prevent conduction with each other.
*Do NOT operate heating devices that create flames or have heating filaments anywhere
near the pump or its piping.
*If there are flammable gases in the air while the pump is operating, do NOT switch
electric appliance on and off.
*Do NOT operate a gasoline engine at the work site.
*Restrict smoking at the work site.
· After you shut down the pump and disconnect the piping, some fluid may remain inside the
pump. Also, if the pump is left unused for a prolonged period, some fluid may remain inside
the pump and connected piping. Therefore, be sure to purge the system of fluid and clean
the pump after prolonged disuse.
If the product is left unused for a prolonged period with fluid remaining in the connected
piping as well as the pump itself, the fluid may expand, depending on the ambient
temperature (because of freezing or heat), which may cause damage to the pump and/or
piping, and possible leakage of fluid.
· Always use genuine Yamada parts when replacing component parts of this product. Do NOT
attempt to modify the components parts or replace them with other than genuine Yamada
parts.
•Torque of all tightening parts must be inspected before operation. Designated torque are
mentioned in maintenance manual.

4
WARNING
· When pumping a hazardous fluid (hot, flammable, strong acid, etc.) with this product,
provide protective measures (install a pit, a protection box, sensors, etc.) in consideration of
possible leakage of fluid, and post warning
signs at necessary places.
Make the warning symbols in
“12.Warning symbols”, and attach
them to the casing and piping, etc.
Leakage of fluid may cause fire, air
pollution or a serious accident.
When pumping a hot fluid, the casing
and piping will become hot, which
may burn the skin when touched.
Fig.0.1
· Before using this product, be sure you are familiar with the precautions regarding the fluid
to be pumped, and verify the corrosion resistance of the parts that will come into contact
with the fluid. NEVER use the product with any fluid against which it does not have
sufficient corrosion resistance or with a fluid that poses a risk of explosion. If you are
unsure of the corrosion resistance, contact your dealer or our regional office. Please make
sure that pump material is compatible with liquid being pumped, or damage may result to
the pump or product being pumped.
· When working in the vicinity of pumping of fluid with this product, be sure to wear
protective gear (goggles, mask, etc.).
· If you have any questions on the operation of this product (method of connection or
installation), contact your dealer or our regional office.
CAUTION
· When operating this product, it may generate loud operating noise, depending upon the
condition of use (fluid pumped, supply air pressure and discharge pressure).
If regulatory rules apply, provide appropriate acoustic measures where necessary. (For the
noise value of this product, see “10.1 Main specifications”.)
· To drive this product, use supply air with minimum moisture content.
· If a diaphragm of this product is damaged, supply air may mix with the fluid or the fluid
may flow into the main body (air-switching portion). If air supply is inadequate or
contaminated, do NOT operate the pump.
· While operating this product, do NOT cover the intake port by hand.
· If the pump remains unused for a long period of time, or you have misgivings about running
the pump, please consult with the dealer where you purchased it or our Sales office.

5
Table of contents
·Introduction············································································· 1
·For safe operation ···································································· 1
·Warnings and cautions ····························································· 2
·Operating caution ···································································· 2
·Table of contents ······································································ 5
1. Names of parts and materials
1.1 DP-15 series········································································ 6
2. Assembly
2.1 Installation of accessories······················································ 7
3. Installation
3.1 Method of transport······························································ 8
3.2 Installing the pump ······························································ 8
3.3 Connecting the ground wire ··················································10
4. Connection
4.1 Connecting fluid piping ························································ 11
4.2 Connecting air piping ··························································12
5. Operation
5.1 Method of operation·····························································13
5.2 Flow adjustment ·································································13
5.3 Shutdown ··········································································14
5.4 Releasing the pressure ·························································14
6. Method of cleaning································································15
7. Daily check···········································································16
8. Troubleshooting
8.1 Pump does not run ······························································16
8.2 Pump runs, but fluid does not come out···································16
8.3 Flow (discharge quantity) decreased ·······································16
8.4 Fluid leaks from exhaust port (silencer) ··································17
8.5 High air consumption during in operation ·······························17
8.6 Irregular noise ···································································17
8.7 Irregular vibration ······························································17
9. Returning the product for servicing
9.1 Before returning the product·················································17
10. Main body specifications
10.1 Main specifications ····························································18
10.2 Appearance and dimensions ················································19
10.3 Performance curve ·····························································20
11. Limited warranty································································21
12. Warning symbols·································································22

6
1. Names of parts and materials
1.1 DP-15 series
A:AirvalveF:PumpBase
B: Reset Button G: Discharge Port
C:OutManifoldH:Intakeport
D: Out Chamber I : Lift Point
E:InManifoldJ : Ground Connection point
DP-15FP□
DP-15BP□
DP-15FVT
·Polypropylene type (FVT: Polyvinylidene fluoride type)
Type FPN
BPN
FPT
BPT
BPH BPS FVT
Switching Portion ADC12
Fluid contact Portion PPG PVDF
Diaphragm NBR PTFE TPEE TPO PTFE
Flat valve PTFE
Ball /O Ring NBR PTFE TPEE/NBR TPO/EPDM PTFE
Valve Seat PPG PVDF
Center Disk PPG(SUS304) PVDF(SUS304)
*Only PTFE diaphragm is setup in polyvinylidene fluoride type.
■List of accessories
•Simple Operation Manual··········· 1
•Air Valve ································· 1

7
2. Assembly
2.1 Installation of accessories
1) First, open the product package and make sure that all the accessories are in order (see “1. Names
of parts and materials” ■List of accessories).
2) Attach the air valve and the silencer (see the appearance drawings on “1. Names of parts and
materials”).
CAUTION
· All of the connection parts are capped or taped for shipment. Remove the caps and tapes.
· When installing accessories, make sure that no foreign matter falls into the product, as it
could cause malfunction of the switching portion.
· Cover each screw with sealing tape to prevent leakage.
· See “10.1 Main specifications”. Remember that the pump is heavy, so extreme care must be
taken when lifting it.

8
3. Installation
3.1 Method of transport
· When lifting the pump using a chain hoist or crane before transporting it, be sure to lift it by the
specified lift point (see “1. Names of parts and materials”).
WARNING
· Be careful that nobody will pass under the pump when you lift it. It would be very
dangerous if the pump should fall.
CAUTION
· See “10.1 Main specifications”. Remember that the pump is heavy, so extreme care must be
taken when lifting it.
· When moving the pump with a forklift or truck, make sure that the pump will not fall. If it
does, it may be damaged and/or cause bodily injury.
· NEVER try to move the pump by pulling the hose connected to the pump. The hose or the
pump may be damaged.
3.2 Installing the pump
1) Decide where the pump should be installed and secure a suitable
space (see Fig.3.1 A to D).
<NOTE>
· Try to keep the suction lift as short as possible.
Protect diaphragm from abnormal breakage, inlet pressure must be
kept below the following values:
*PTFE diaphragm : 2.8 PSI (height 6.6 ft) During operation
: 7 PSI (height 16.4 ft) Not in operation
*Other diaphragms : 14 PSI (height 32.8 ft)
(When using clean water under ambient temperature)
· Remember to provide sufficient space around the pump for
maintenance.
· The direction of the fluid intake port and the discharge port can be
switched opposite from each other. (For switching, see the
maintenance manual.)
· In the event diaphragm failure the exhaust from pump may contain
some sludge.
When operating the pump where it would have an impact on the
environment, the exhaust should be directed to a place where there
will be no environmental impact.
2) Remove the pump from the package and
install it in the designated location.
3) When fixing the pump in place, use the
cushions on the pump base, and secure the
pump by tightening the tied-down bolts a
little at a time.
Fig.3.1

9
CAUTION
· Even if you do not use the cushions to secure the pump in place, mount it in such a way
that vibration generated by pump operation will be absorbed.
· If the pump will be submerged during operation, follow the steps below:
*Verify the corrosion resistance of each component of the pump, and do NOT expose the
pump to any fluid for which it does not have proper corrosion resistance.
*Exhaust should directed outside, not into the fluid in which the pump is submerged.
For information on how to arrange the exhaust, see Note: Arranging outside exhaust and
Fig.3.2 below.
*Make sure that you can reach all of the valves without submerging your hand.
· When operating the pump, operation noise may be generated, depending upon conditions of
use (kind of fluid being pumped, supply air pressure and discharge pressure).
If any regulatory rules apply, provide appropriate acoustic measures. (For the noise level of
this product, see “10.1 Main specifications”.)
· When pumping a hazardous fluid (hot, flammable, strong acid, etc.), provide protective
measures (installation of a pit or sensors, etc.) in consideration of possible leakage of fluid,
and post warning signs at necessary places. For details, see the applicable operating
caution on P.2 and P.4.
WARNING
· If using the pump with a flammable fluid or in a flammable environment, read the
applicable operating caution on P.3.
<NOTE> Arranging outside exhaust
· Remove the silencer.
· Connect a hose with a ground wire to the pump's exhaust
port, and attach the silencer to the tip of the hose. Use a
hose of the same diameter as the exhaust port. (If the
hose is longer than 5 meters, consult your dealer or our
regional office.)
· Have a pit, a protection box, etc. at the end of the hose.
WARNING
· Be sure to have a pit, a protection box, etc. at the end of the hose in preparation for the flow
of fluid in case of damage to a diaphragm. For details, see the applicable operating caution
on P.2.
· Pump exhaust should be directed to a safe place, away from people, animals and food.
<NOTE> Solenoid Operation
When air line operation is to be controlled by a solenoid valve, a three way type is recommended.
A three way solenoid valve allows any trapped air to bleed off, in turn improving pump performance.
Fig.3.2

10
3.3 Connecting the ground wire
When installing the pump, be sure to connect
the ground wire at the specified position. For
the specified position for connecting the ground
wire, see “1. Names of parts and materials”.
b) Also connect ground wires to peripheral
equipment and piping.
c) Use 2.0mm2minimum ground wire.
WARNING
· Be sure to connect ground wires to the connected piping and any other connected
equipment. For details, see the applicable operating caution on P.3. When the pump is
operated without a ground wire or otherwise not properly grounded, friction between parts
and abrasion caused by some fluids flowing inside the casing may generate static electricity.
Also, depending on the type of fluid being pumped and the installation environment (such
as gases in the air or the surrounding fixtures), it may be a cause of fire or electric shock.
Position for
connecting the
ground wire
Fig.3.3

11
4. Connection
4.1 Connecting fluid piping
1) Connect a flow valve and a drain valve to the fluid discharge port of the pump.
2) Connect a valve for maintenance to the fluid suction intake port of the pump.
3) Connect a hose to the valve on the suction-port side and the valve of the discharge-port side of the
pump.
4) Connect a hose on the suction-side intake and the discharge-port side to the respective vessels.
CAUTION
· Use a flexible hose to absorb pump vibration, and ground the hose.
· Make sure that there will be no external force on any connection part of the pump. Be
especially careful not to have the pump support part of the weight of the hose and the piping.
· Use a sturdy hose that will not collapse under the strong suction of the pump. Also, make
sure the hose is of more than sufficient pressure rating.
· Use a hose of a diameter the same as or larger than the pump's ports. If you use a hose of
smaller diameter, the pump's performance will be adversely affected, and it may even
malfunction.
· When pumping a fluid that contains slurry, verify that the particle size is below the slurry
limitation (see “10.1 Main specifications”). If it exceeds the limitation of slurries indicated
in the main specifications, attach a strainer to the pump to stop larger particles. Otherwise,
such particles may cause a malfunction.
· If, depending upon the place of pump installation, the volume
of the pumped fluid changes drastically, install a relief valve
on the discharge side, and bring the pressure down below the
maximum permissible value. If, owing to a change in the
volume of fluid, the pressure inside the pump exceeds the
maximum permissible pressure, it may cause damage.
· Keep a vessel below the relief valve to catch any
drain off.
· When testing piping for leakage, do NOT apply pressure to the pump's inlet and outlet
sides with compressed air from outside. It may cause abnormal breakage to the diaphragm
or the switching portion. When testing the piping, either install a valve between the pump's
suction inlet and the discharge outlet and piping, or disconnect the pump from the piping
and install plugs so that there will be no pressure from outside.
· In our product inspection, clean water is used. To prevent mixture of dirty water into the
fluid to be pumped, clean the inside of the pump before finishing installation work.
· When installing a standby pump or two pumps in parallel form, be sure to provide a valve
on each of the IN and OUT sides and perform pump switching by using the liquid material
valve. If the valve of the stop-side pump is open, the diaphragm will be inverted by the
discharge pressure of the operating-side pump, resulting in damage in an early stage.
Fig.4.1
Fig.4.2

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4.2 Connecting air piping
WARNING
· Before starting work, make sure that the air compressor is shut off.
1) Connect an air valve, air filter, regulator and if necessary lubricator (hereinafter called the
"peripheral equipment") to hose which connected to compressor.
Install air valve on the air inlet of the pump. See <NOTE> for the details.
2) Install these peripheral items supported by brackets, etc., near the pump.
3) Connect the hose from the peripheral equipment to the air valve of the pump's supply port.
CAUTION
· Use a flexible hose to absorb pump vibration, and ground the hose.
· Make sure that there will be no external force on any connection part of the pump. Be
especially careful not to have the pump support part of the weight of the hose and the
piping.
· The piping and the peripheral equipment may become clogged with sludge. Clean the inside
of the piping for 10 to 20 seconds before connecting it to the pump.
· Be sure to sufficiently ground the piping and peripheral equipment.
<NOTE>
· Air piping size should be equal to the inlet port of the pump to supply enough air to run the pump.
The air compressor should be able to provide adequate air flow to the pump. Attach the compressor
as close as possible to the pump, considering operability and stability of air pressure.
· If you use a solenoid valve as the air valve, be sure it is a three-way valve.
When the valve is closed, the internal compressed air of the pump will be released, and this will
switch the spool to its normal position.
· Use of a coupler for the connection part of each hose will make operation and maintenance easier.
· If you use the pump intermittently the pump will not require lubrication.
However lubrication is recommended if running the pump continuously for long periods or using very
dry air or at high temperatures. This will guarantee the life of the pumps seals.
*High temperature operation: When transferring liquid whose temperature exceeds 70°C
*Continuous operation: When the pump operates continuously for longer than 1 hour and is stopped
for less than 15 minutes.
*Lubrication: Use only turbine oil Class 1 grade oil (equivalent to ISO VG 32), under the following
conditions; Oil concentration at 50mg/m³, Absolute pressure at 0.1MPa. Maximum
temperature of 20°C and Humidity at 65%.
Fig.4.3

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5. Operation
5.1 Method of operation
CAUTION
· Before starting the pump, make sure that all piping is properly connected.
· Also, before starting the pump, make sure that all the bolts are securely tightened.
(Refer to the maintenance manual for the bolts that a regulation torque are explained.)
· Make sure that the air valve, regulator and the drain valve on the discharge side are closed.
Also, make sure that the valve on the suction side is opened.
1) Start the air compressor.
2) Open the air valve in front of each piece of peripheral equipment, and adjust the supply air
pressure with a regulator to within the permissible range (see “10.1 Main specifications”).
3) Open the flow valve on the discharge side.
4) Press the RESET button, and then slowly open the air valve of the pump.
5) First, verify that fluid is flowing inside the piping and is being pumped to the discharge side, and
then fully open the air valve.
CAUTION
· Do NOT open the air valve suddenly.
· In case of use lubricator, must be used turbine oil none addition class 1 turbine oil
(equivalent ISO VG32 grade) for lubricants. Do not apply lubricants more than required
and also do not use any other lubricants, which designated on this instruction manual. This
may cause of pump problem and there is danger of serious bodily damage.
5.2 Flow adjustment
· Adjust the flow valve on the discharge side. For the relationship among the flow, supply air pressure
and discharge pressure, see “10.3 Performance curve”.
CAUTION
· As you start closing the flow valve, the supply air pressure may rise. Make sure that the
pressure is kept within the normal operating range (see “10.1 Main Specifications”).
· Depending upon the viscosity and specific gravity of the fluid, the suction stroke and other
conditions, the permissible suction flow speed of fluid into the pump will vary; however, if
the pump speed (flow speed of fluid) increases greatly, cavitation will occur, and this not
only will reduce pump performance, but it may cause a malfunction. Adjust the supply air
pressure as well as the flow in order to prevent cavitation.
· If fluid is not discharged after you start the pump, or if you hear an abnormal noise or
notice any irregularity, shut down the pump immediately (see “8. Troubleshooting”).

14
5.3 Shutdown
· Close the air valve of the pump and shut off the supply air.
CAUTION
· There is no problem in shutting down the pump with the flow valve closed while air is being
supplied; however, if this condition continues for many hours while there is nobody
watching the pump, it may continue running when there is a leak from the pump or piping,
and fluid may continue flowing out of the position of leakage. Upon finishing your work,
release the internal pressure from the pump and close the air valve (see “5.4 Releasing the
pressure”).
· When the pump is shut down while pumping slurry, particulate matter contained in the
slurry will be deposited and get stuck inside the out chamber. If the pump is started again
as is, the diaphragm may be damaged or the center disk may be overloaded, and this may
cause damage such as bending of the center rod. After finishing your work, purge the
remaining fluid from the pump (see “6. Cleaning of cleaning”).
5.4 Releasing the pressure
1) Make sure that the air valve of the pump is closed.
2) Shut down the air compressor or close the valve on the air-supply side of the peripheral equipment.
3) Close the flow valve on the discharge side, start slowly opening the drain valve, and discharge the
fluid under pressure.
4) Open the air valve of the pump, start running the pump, and discharge the remaining air.
5) After making sure that the pump has been shut down and the pressure has been released, fully
open the regulator, and close the air valve and drain valve of the pump.
CAUTION
· Keep a vessel below the relief valve to catch any drain off.
· Fluid under pressure will gush out as soon as you open the valve, so be careful.
· If the pump will be unused for a prolonged period, purge and clean the pump (see the
Operating caution on P.3).

15
6. Method of cleaning
WARNING
· Before starting operation, make sure that compressed air is not supplied to the pump.
· Before starting operation, make sure that the pump is not pressurized.
1) Remove the hose from the suction side of the pump.
2) Close the flow valve on the discharge side, open the drain valve, and then operate a pump by
starting air pressure for a while to discharge any fluid remaining inside the pump as much as
possible.
3) Remove the hose from the discharge side, and attach different hoses to the suction side and the
discharge side for cleaning.
4) Be ready with a vessel with cleaning solution, select cleaning solution appropriate for the type of
fluid pumped, and then connect the suction-side and the discharge-side hoses of the pump.
5) Operate a pump by starting air pressure slowly, and let the cleaning solution circulate for sufficient
cleaning.
6) Finally, flush with clean water.
7) Remove the hose from the suction side of the pump, run the pump for a while and purge the pump
of remaining fluid as much as possible.
CAUTION
· Be careful when removing piping. Fluid will gush out.
· After cleaning with clean water, turn the pump upside-down to drain out the water.

16
7. Daily check
· Before starting pump operation, be sure to conduct the following check every day. If any irregularity
is found, do NOT start running the pump until the cause of the irregularity has been found and
corrective measures have been taken.
a) Verify the drain flow through the air filter.
b) In case using a lubricator, verify the quantity of lubricating oil.
c) Make sure that there is no leakage of fluid from any connection part or the pump.
d) Make sure that there are no cracks in the pump casing or piping.
e) Check the tightness of every bolt of the pump and retighten if necessary. For details, see the
maintenance manual.
f) Make sure that the connection parts of the piping and peripheral equipment are not loose.
g) Make sure that each consumable parts of the pump has not been inspected or replaced. For details,
see the maintenance manual.
8. Troubleshooting
8.1 Pump does not run
Cause
A
ction to be taken
The exhaust port (silencer) of pump is clogged
with sludge.
Check and clean the exhaust port and silencer.
Air is not supplied. Start the compressor, and open the air valve and
air regulator.
The supply air pressure is low. Check the compressor and the configuration of air
piping.
Air leaks from connection parts. Check the connection parts and tightness of bolts.
Air piping or peripheral equipment is clogged
with sludge.
Check and clean the air piping.
The flow valve on the discharge side is not open. Open the flow valve on the discharge side.
The spool stopped in neutral position. Press the RESET button.
The fluid piping is clogged with sludge. Check and clean the fluid piping.
The pump is clogged with sludge. Disassemble the casing, check and clean.
8.2 Pump runs, but fluid does not come out
Cause
A
ction to be taken
The suction lift or discharge head is long. Confirm the piping configuration and shorten the
length.
The discharge-side fluid piping (including the
strainer) is clogged with sludge.
Check and clean the fluid piping.
The valve on the suction side is not open. Open the valve on the suction side.
The pump is clogged with sludge. Disassemble the casing, check and clean.
The ball and valve seat are worn out or damaged. Disassemble the manifold, check and replace parts.
8.3 Flow (discharge quantity) decreased
Cause
A
ction to be taken
The supply air pressure is low. Check the compressor and configuration of air
piping.
Air piping or peripheral equipment is clogged
with sludge.
Check and clean the air piping.
The discharge-side flow valve opens differently. Adjust the discharge-side flow valve.
Air is taken in together with fluid. Replenish fluid and check the configuration of the
suction-side piping.
Cavitation occurs. Adjust the supply air pressure and discharge
pressure, and shorten the suction lift.
Chattering occurs. Adjust the supply air pressure and discharge
pressure. Reduce inlet flow valve to adjusting
liquid pressure and volume.
Icing on air-switching portion. Eliminate ice from air-switching valve and check
and clean the air filter. Use external exhaust hose
to control exhaust air speed. (Refer Fig.3.2)
The fluid piping (including the strainer) is
clogged with sludge.
Check and clean the fluid piping and strainer.
The exhaust port (silencer) of the pump is clogged
with sludge.
Check and clean the exhaust port and silencer.
The pump is clogged with sludge. Disassemble the casing, check and clean.

17
8.4 Fluid leaks from exhaust port (silencer)
Cause
A
ction to be taken
The diaphragm is damaged. Disassemble and check the pump and replace the
diaphragm.
The fastening nuts for the center disk are loose. Disassemble and check the pump.
Tighten the nuts.
8.5 High air consumption during in operation
Cause
A
ction to be taken
The seal ring and sleeve are worn out. Disassemble the air-switch portion, check and
clean. Replace parts as necessary.
8.6 Irregular noise
Cause
A
ction to be taken
The supply air pressure too high. Adjust the supply air pressure.
The spool oscillates, and occur ball chattering. Adjust the supply air pressure and discharge
pressure. Reduce inlet flow valve to adjusting
liquid pressure and volume.
The pump is clogged with sludge with particles of
larger than the permissible diameter.
Disassemble the casing, check and clean.
8.7 Irregular vibration
Cause
A
ction to be taken
The supply air pressure is too high. Adjust the supply air pressure.
The spool oscillates, and occur ball chattering. Adjust the supply air pressure and exhaust
pressure.
Connection parts and pump mounting are loose. Check each connection part and tighten the bolts.
· If disassembly is required, refer to the maintenance manual and follow with the instructions.
· If any of the above mentioned causes does not apply to your problem, contact your dealer or our
regional office.
9. Returning the product for servicing
9.1 Before returning the product
1) Purge the pump of fluid and clean (see “6. Method of cleaning”).
2) Return the product in the same package as when it was first shipped from the factory.
WARNING
· It will be the end-user responsibility to thoroughly wash a clean the pumps to prevent
accidents caused by liquid leaks.
CAUTION
· Be sure to prevent liquid leak from pump for safe transport.

18
10. Main body specification
10.1 Main specifications
■DP-15 series
Type DP-15
FP□BP□FVT
Nominal Diameter 15 mm
Fluid
Connection
Suction Port
Rc 1/2
Discharge
Port
Air
Connection
Supply Port Rc 1/4
Exhaust
Port Rc 3/8
Normal Air Pressure *1 0.2-0.7 MPa
Maximum
Discharge Pressure *1 0.7 MPa
Discharge Volume/cycle *2 55 mL
Maximum
Discharge Volume 27 L/min
Maximum
Air Consumption 300 L/min(ANR)
Slurry Limitation *3 1 mm or less
Limitation of Viscosity 0.5 Pa·s or less
Operating
Temperature
Range
Temperature
Ambient 0-70 °C
Temperature
Liquid 0-60 °C
A-weighted emission sound
pressure level *4 85 dB
A-weighted sound power
level *5 96 dB
Weight 3.5 kg 4.3 kg
*1. Maximum air pressure for non-metallic pumps decreases with temperature (See 18 page
Temperature Pressure Curve).
*2. Discharge Volume/cycle is highly dependent on application. Contact your local distributor or Yamada
for more information.
*3. Do not use the flat valve type pump for the liquids with slurry.
*4. The measuring method is based on ISO 1996.
*5. The measuring method is based on ISO 3744.

19
149[146]
246[244]
65
139.5[138]
196
106 85
205
297
156.5
180
115
54
4-Φ9
LIQU ID OU TLET
LIQU ID IN LET
AIR INLET
EXHAUST
[ ]:FVT
Rc1 /2
Rc1 /2
Rc1/4
Rc3 /8
10.2 Appearance and dimensions
■DP-15FP□/ BP□/ FVT
CAUTION
· Due to improvement or modification of products, dimensions may change without notice.
Please contact your distributor our regional office for detailed information.