STM DPA25090 User manual

Instruction Manual
WARNING:
Read carefully and understand all INSTRUCTIONS before operating. Failure to follow the safety
rules and other basic safety precautions may result in serious personal injury.
Save these instructions in a safe place and on hand so that they can be read when required.
Keep these instructions to assist in future servicing.
Air-operated Double Diaphragm Pump
DPA25090

GENERAL SAFETY REGULATIONS
WARNING: The warnings, cautions, and instructions
discussed in this instruction manual cannot cover all
possible conditions or situations that could occur. It
must be understood by the operator that common
sense and caution are factors that cannot be built into
this product, but must be supplied by the operator.
1. Keep the work area clean and dry. Damp or wet work areas can result in
injury.
2. Keep children away from work area. Do not allow children to handle this
product.
3. Use the right tool for the job. Do not attempt to force small equipment to do
the work of larger industrial equipment. There are certain applications for
which this equipment was designed. It will do the job better and more safely
at the capacity for which it was intended. Do not modify this equipment, and
do not use this equipment for a purpose for which it was not intended.
4. Check for damaged parts. Before using this product, carefully check that it
will operate properly and perform its intended function. Check for damaged
parts and any other conditions that may affect the operation of this product.
Replace damaged or worn parts immediately.
5. Do not overreach. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etc.
6. DO NOT use the equipment when tired or under the influence of drugs,
alcohol, or medication. A moment of inattention while operating this
equipment may result in serious personal injury.

TECHNICAL DETAILS
TECHNICAL
DETAILS
EXPLODED AND
PARTS LIST
MAINTENANCE
TROUBLE
SHOOTING OPERATING
INSTRUCTIONS AIR AND LUBE
REQUIREMENTS GENERAL
DESCRIPTION
OPERATING AND
SAFETY PRECAUTIONS
Model No.
DPA25090
Inlet/
Outlet Air Inlet Flow Rate Max. Air
Inlet/Outlet
Pressure
Max.
Diameter
Solid
Pump
Body Membrane
1" 1/4" 24GPM/90LPM 115PSI/8BAR 1/8" Aluminum Nitrile
100
75
50
25
20
15
10
5
876543210
Working Pressure(Bar)
Flow Rate(L/min)
Air Comsumption(M
3
/h)
Flow Rate
Air Comsumption
DIMENSIONAL DATA
10.82" / 275mm 8.0" / 203mm
8.05" / 204.5mm
5.90" / 150mm
7.57" / 192.5mm
6" / 0.23mm
13.22" / 336mm

TECHNICAL
DETAILS
EXPLODED AND
PARTS LIST
MAINTENANCE
TROUBLE
SHOOTING OPERATING
INSTRUCTIONS AIR AND LUBE
REQUIREMENTS GENERAL
DESCRIPTION
OPERATING AND
SAFETY PRECAUTIONS
OPERATING AND SAFETY PRECAUTIONS
READ, UNDERSTAND, AND FOLLOW THIS INFORMATION TO AVOID INJURY AND
PROPERTY DAMAGE.
WARNING! EXCESSIVE AIR PRESSURE. Can cause personal injury, pump
damage or property damage.
• Do not exceed the maximum inlet air pressure as stated on the pump model plate.
•
Be sure material hoses and other components are able to withstand fluid pressures developed
by this pump. Check all hoses for damage or wear. Be certain dispensing device is clean and
in proper working condition.
WARNING! STATIC SPARK. Can cause explosion resulting in severe injury or
death. Ground pump and pumping system.
• Spark can ignite flammable material and vapors.
• The pumping system and object being sprayed must be grounded when it is pumping,
flushing, recirculating or spraying flammable materials such as paints, solvents, lacquers etc.
or used in a location where surrounding atmosphere is conducive to spontaneous combus-
tion. Ground the dispensing valve or device, containers, hoses and any object to which
material is being pumped.
• Use the pump grounding screw terminal provided. Connect a suitable ground wire to a good
earth ground source.
• Secure pump, connections and all contact points to avoid vibration and generation of contact
or static spark.
• Consult local building codes and electrical codes for specific grounding requirements.
• After grounding, periodically verify continuity of electrical path to ground. Test with an
ohmmeter from each component (e.g., hoses, pump, clamps, container, spray gun, etc.) to
ground to insure continuity. Ohmmeter should show 100 ohms or less.
• Use proper ventilation.
• Keep inflammables away from heat, open flames and sparks.
• Keep containers closed when not in use.
WARNING! Pump exhaust may contain contaminants. Can cause severe injury.
Pipe exhaust away from work area and personnel.
• In the event of a diaphragm rupture material can be forced out of the air exhaust muffler.
• Pipe the exhaust to a safe remote location when pumping hazardous or inflammable
materials.
WARNING! HAZARDOUS PRESSURE. Can result in serious injury or property
damage. Do not service or clean pump, hoses or dispensing valve while the
system is pressurized.
WARNING! EXPLOSION HAZARD. Models containing aluminum wetted parts
cannot be used with III. -Trichloroethane, Methylene Chloride or other Halogenat-
ed Hydrocarbon solvents which may react and explode.
CAUTION! Verify the chemical compatibility of the pump wetted parts and the
substance being pumped, flushed or recirculated.
CAUTION! Do not use the pump for the structural support of the piping system.
Be certain the system components are properly supported to prevent stress on
the pump parts.

CAUTION! Prevent unnecessary damage to the pump. Do not allow pump to
operate when out of material for long periods of time.
Disconnect air line from pump when system sits idle for long periods of time.
GENERAL DESCRIPTION
• The diaphragm pump offer high volume delivery even at low air pressure.
• Air-operated double diaphragm pumps utilize a pressure differential in the air chambers to
alternately create suction and positive fluid pressure in the fluid chambers, ball check insure a
positive flow of fluid.
• Pump cycling will begin as air pressure is applied and it will continue to pump and keep up with
the demand. It will build and maintain line pressure and will stop cycling once maximum line
pressure is reached (dispensing device closed) and will resume pumping as needed.
AIR AND LUBE REQUIREMENTS
WARNING! EXCESSIVE AIR PRESSURE. Can cause pump damage, personal
injury or property damage.
• The air delivery pipe should be big enough to ensure the air needed.
• Air pressure not exceed 115 PSI (8 BAR).
• Afilter capable of filtering out particles larger than 50 microns should be used on the air supply.
There is no lubrication required other than the O-ring lubricant which is applied during
assembly or repair.
• If lubricated air is present, make sure that is compatible with the O-rings in the air motor
section of the pump.
OPERATING INSTRUCTIONS
• Always flush the pump with a solvent compatible with the material being pumped if the material
being pumped is subject to “setting up” when not in use for a period of time.
• Disconnect the air supply from the pump if it is to be inactive for a few hours.
• Disconnect the air supply from the pump if it is not in use.
• The material supply tubing should not be too small or restrictive. Be sure not to use hose which
might collapse.
• When the diaphragm pump is used in a forced-feed (flooded inlet) situation, it is recommended
that a “Check Valve” be installed at the air inlet.
• Secure the diaphragm pump legs to a suitable surface to insure against damage by vibration.
MAINTENANCE
• Provide a clean work surface to protect sensitive internal moving parts from contamination
from dirt and foreign matter during service disassembly and reassembly.
• Keep good records of service activity and include pump in preventive maintenance program.
• Before disassembling, empty captured material in the outlet manifold by turning the pump
upside down to drain material from the pump.
TROUBLE SHOOTING
Product discharged from exhaust outlet.
• Check for diaphragm rupture
• Check tightness of diaphragm
Air bubbles in product discharge.
• Check connections of suction plumbing
• Check O-rings between intake manifold
and fluid caps
• Check tightness of diaphragm nut
Low output volume, erratic flow, or no flow.
• Check air supply
• Check for plugged outlet hose
• Check for kinked (restrictive) or collapsed inlet
material hose
• Check if there is leakage for the connection.
These must be air tight
• Inspect the pump for solid objects logged in
the diaphragm chamber or the seat area
TECHNICAL
DETAILS
EXPLODED AND
PARTS LIST
MAINTENANCE
TROUBLE
SHOOTING OPERATING
INSTRUCTIONS AIR AND LUBE
REQUIREMENTS GENERAL
DESCRIPTION
OPERATING AND
SAFETY PRECAUTIONS

TECHNICAL
DETAILS
EXPLODED AND
PARTS LIST
MAINTENANCE
TROUBLE
SHOOTING OPERATING
INSTRUCTIONS AIR AND LUBE
REQUIREMENTS GENERAL
DESCRIPTION
OPERATING AND
SAFETY PRECAUTIONS
EXPLODED AND PARTS LIST
FLUID SECTION FOR SERIES: DPA25090
Part No.
1
2
*3
*4
*5
*6
7
8
*9
10
*11
Description
Hex-bolt
Discharge Manifold
Valve Cover
Valve Ball
Valve Seat
O-ring(37.77*2.62)
Hex-bolt
Hex-bolt
O-ring(17.17*1.78)
Liquid Chamber Plate
Diaphragm
Q’ty
8
2
2
4
4
4
16
2
2
2
2
Part No.
12
13
14
15
16
17
18
*19
20
21
Description
Air Chamber Plate
Screw
Air Chamber
Bracket
Screw
Air Motor Assembly
Nut
O-ring(94.92*2.62)
Plug
Pump cover
Q’ty
2
12
2
2
1
1
16
2
2
2
Note: The Part No. with “*”are the wearing parts

TECHNICAL
DETAILS
EXPLODED AND
PARTS LIST
MAINTENANCE
TROUBLE
SHOOTING OPERATING
INSTRUCTIONS AIR AND LUBE
REQUIREMENTS GENERAL
DESCRIPTION
OPERATING AND
SAFETY PRECAUTIONS
EXPLODED AND PARTS LIST
AIR MOTOR SECTION
Part No.
1
2
3
4
5
6
*7
8
9
*10
*11
Description
Hex-bolt M6X20
Press board
Seal for press board
Spacer
Spacer
Spacer
O-ring 20.35X1.78
Hex bolt M5X12
Gasket
Seal for gasket
Washe
Q’ty
4
1
1
4
5
2
6
8
2
2
2
Part No.
12
*13
14
*15
16
*17
18
*19
20
*21
Description
Major Valve
O-ring 9.93X2.62
Sleeve
O-ring 20.35X1.78
Retaining Ring 25
O-ring 7.1X2.65
Pilot Valve
O-ring 6.86X1.78
Muffler 3/8"
O-ring 15.60X1.78
Q’ty
1
5
1
3
1
2
1
5
1
2
1234567
8
9 10 11
121316
14 15
171819
20
21
Note: The Part No. with “*”are the wearing parts