Dellmeco DM 15/25 User manual

Serial no.
INSTRUCTION MANUAL
Air operated double diaphragm pumps
Ver. 3.28
Models: DM 15/25
DM 20/75
DM 25/125
DM 40/315
DM 50/565
DM 80/850

2I DELLMECO I AODD DIAPHRAGM PUMPS
D ECLARATION OF CONFORMITY
Directive 2006/42/EC, Annex 2A
Company: DELLMECO LTD
Address: Unit 1, Willow Row
Longton, Stoke on Trent
Staffordshire, ST3 2PU, United Kingdom
declares under our sole responsibility, that the product:
Product name: Air Operated Double Diaphragm Pumps
Models: DM - series
Referred to in this declaration conforms with the:
- Directive 2006/42/EC
Date: December 2nd 2013
K. Ziemann
Managing Director

3I DELLMECO I AODD DIAPHRAGM PUMPS
Tableofcontents
1.Introduction_________________________________________________________________________________ 4
2. For safe operation____________________________________________________________________________ 4
3. Warnings and cautions________________________________________________________________________ 4
4. Operating caution ____________________________________________________________________________ 4
5. Names of parts and materials __________________________________________________________________ 6
5.1. DM 15/25 _____________________________________________________________________________________6
5.2. DM 20/75, DM 25/125___________________________________________________________________________8
5.3. DM 40/315, DM 50/565_________________________________________________________________________10
5.4. DM 80/850 (Aluminium version only)______________________________________________________________12
6. Assembly __________________________________________________________________________________ 14
7. Installation_________________________________________________________________________________ 14
7.1.Installing the pump _____________________________________________________________________________14
7.2. Connecting the ground wire ______________________________________________________________________16
8.Connection _________________________________________________________________________________ 16
8.1. Connecting fluid piping _________________________________________________________________________16
8.2. Connecting air piping___________________________________________________________________________17
9.Operation__________________________________________________________________________________ 18
9.1. Method of operation____________________________________________________________________________18
9.2. Flow adjustment_______________________________________________________________________________18
9.3. Shutdown ____________________________________________________________________________________19
10.Method of cleaning _________________________________________________________________________ 19
11.Daily check ________________________________________________________________________________ 20
12.Possible problems___________________________________________________________________________ 20
13.Returning the product for servicing ___________________________________________________________ 22
14.Main body specification _____________________________________________________________________ 24
14.1. Main specification ____________________________________________________________________________24
14.2. Appearance and dimensions_____________________________________________________________________24
14.3. Technical Data _______________________________________________________________________________25
14.4. Pump code __________________________________________________________________________________25
14.5. Performance curves ___________________________________________________________________________26
15. Dellmeco Active Pulsation Dampers for Metal Pumps ____________________________________________ 27
15.1. Main specification____________________________________________________________________________27
15.2. Appearance and dimensions_____________________________________________________________________30
16. Optional Equipment________________________________________________________________________ 31
16.1. Barrier Chamber System (option code BC1, BC2, BC3)_______________________________________________31
16.2. Stroke Counting(option code SC1, SC2, SC3, SC5, SC6) _____________________________________________33
16.3. Diaphragm Monitoring (option code DM1, DM2)____________________________________________________35
16.4. Flange Connections (optioncode F4, F7, F8, F9) ____________________________________________________35
16.5. Sleeve with Split Connections (option code S)_______________________________________________________35
16.6. Back Flushing System (option code BF1, BF2, BF3) _________________________________________________36
16.7. High Pressure (option code HP)__________________________________________________________________37
16.8. Heating Jacket (option code HJ) - AISI 316 only_____________________________________________________40
16.9. Powder Pump (option code P) –Aluminium only ____________________________________________________41
17.Limited warranty___________________________________________________________________________ 42

4I DELLMECO I AODD DIAPHRAGM PUMPS
1. Introduction
This pump is a positive-displacement pump that transfers fluids by means of diaphragms movement operated by
compressed air. The casing in contact with the fluid is made of Aluminium (Al), Aluminium coated with PTFE (Al + PTFE),
AISI316, or Cast Iron (CI).
2. For safe operation
This document contains information indispensable for maintaining safe and efficient operation of this product.
Read this document carefully before using the pump, particularly the "Warnings and cautions". Get familiar with all
operating procedures. This document must be kept handy for future reference.
3. Warnings and cautions
The meanings of warning and caution symbols are given below. Be sure to remember their meanings.
WARNING: ignoring the caution and operate the product in an improper manner can result
in danger of serious bodily injury or death.
CAUTION: ignoring the caution and operate the product in an improper manner can result
in danger of personal injury or property damage.
ØThis symbol means a “DON’T”, and will be followed by an explanation on what you must not do.
This symbol means a “DO”, and will be followed by an explanation on what you must do in a specified situation.
4. Operating caution
Before using this product
!
WARNING
!
!
Todrive thepumpyou mustuseone ofthe followingcompressed gases(calledinthis document "compressed air"):
-Compressed air supplied from air compressor
- Nitrogen(N2)gas
Useofcompressedairother thantheabovemaycauseairpollution,damagetothepump, orevenanexplosion.
Themaximumpermissiblepressureforthecompressedair,andthefluidpumpedbyoneofitspumpsis 8bars.
Shouldtheaboveapplicablemaximumpermissiblepressurebeexceeded,thefollowingresultsmayfollow:
damage to the casing, or even a severe, possibly fatal accident.
In some pomp executions, specified by manufacturer, the max. pressure can reach 14 bars.
In case a diaphragm gets damaged,fluid will gush out together with air through theexhaust port. Provide
protective measures in consideration of possible leakage of fluid.
Whenyouusing the hose and pitetc,makesuretouseamodelwithappropriatecorrosionresistance forthe fluid
tobepumped.

5I DELLMECO I AODD DIAPHRAGM PUMPS
!
WARNING
!
CAUTION
When installing this product, be sure to connect a ground wire from the specified position of this product.
Otherwise friction between parts and abrasion caused by the flow of some fluids inside the casing may
generate static electricity. Depending on the type of fluid being pumped and the installation environment
(such as gases in the air and type of surrounding mixtures), static electricity could cause fire or electric
shock.
Some fluid may remain inside the pump and inside the connected piping after shutting down the pump, or if
the pump is left unused for a prolonged period.
Therefore, be sure to purge the system of fluid and clean the pump before prolonged disuse.
The fluid remaining in the connected piping as well as the pump itself may expand because of freezing or
heat which may cause damage to the pump or/and piping and lead to leakage of the fluid.
ØUse only genuine Dellmeco parts when replacing component parts of this product.
Torque of all tightening parts must be checked before running the pump. Designated torques are mentioned
in maintenance manual. Valve ball stoppers in all metal pumps, except DM 80/850, are thread-mounted with
additional use of LOCTITE 243 Medium Strenght Threadlocker. When assembling valve ball stoppers, you have to
use LOCTITE 243 product necessarily to reinforce the connection.
In case of pumping a hazardous fluid (hot, flammable, strong acid, etc.) with this pump, protective measures
(install a pit, a protection box, sensors, etc.) must be provided in consideration of possible leakage of fluid.
Warning signs must be displayed at necessary places. Leakage of fluid may cause fire or accident.
Before using this pump, get fully 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 pump 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 unable to verify the corrosion resistance, contact your dealer. Using this product with
any fluid against which the parts in contact with the fluid do not have sufficient corrosion resistance may
result in damaging the product or leakage of fluid.
The running pump may generate loud operating noise. Its level will vary depending upon the conditions of
use (fluid pumped, supply air pressure and discharge pressure)
To drive this product, supply air with minimum moisture content and without any oil must be used.
If a diaphragm of this pump is damaged, supply air may mix with the fluid or the fluid may flow into the
central housing. DO NOT OPERATE THE PUMP if air supply is inadequate or contaminated.
ØWhile operating this product, do NOT put your hand on the inlet port.

6I DELLMECO I AODD DIAPHRAGM PUMPS
5. Names of parts and materials
5.1. DM 15/25
11
Flange Connections: PN10 DIN 2576 (option F7),
ANSI 150 RF-SO (option F8), PN16 DIN 2277/2278
(option F9)
7
13
2
7
3
4
5
6
9
14
15
17
18
12
1
Split Connections (option S)
99
M4 ground hole
location

7I DELLMECO I AODD DIAPHRAGM PUMPS
Spare parts list for DM 15/25 pumps
MATERIAL
DM 15/25
1.
2
Pump housing
Al
3 15 01 60
Al + PTFE
3 15 01 61
Cast iron
3 15 01 65
2.
1
Center housing
PE conductive
1 10 10 21
3.
2
Suction/Discharge ports
Al
3 15 30 60
AISI 316L
3 15 30 53
Cast iron
3 15 30 65
Suction/Discharge ports-twin
(Split Connections)
Al
3 15 31 60
1
Suction port-drum
Al
3 15 33 60
4.
2
Diaphragm
TFM (PTFE)
1 10 50 05
EPDM
1 10 50 08
NBR
1 10 50 10
EPDM/TFM/PFA
1 10 50 00
5.
4
Valve balls
PTFE
1 10 60 23
EPDM
1 10 60 08
NBR
1 10 60 10
AISI 316
1 10 60 52
Ceramic
1 10 60 90
6.
4
Valve ball stopper
AISI 304
3 15 39 50
AISI 316
3 15 39 52
7.
4
Sealing inlet/outlet –complete
NBR
3 15 70 10
EPDM
3 15 70 08
9.
4
Housing bolt
AISI 304
3 15 42 50
11.
4
Shock absorber
NR/St37
1 10 69 06
12.
8
Nut with washer
AISI 304
1 10 45 59
13.
1
Air valve
PET/NBR
1 08 020 31
PET/FKM
1 08 020 32
14.
1
Shaft
AISI 304
1 08 24 50
15.
6
O-ring, air valve
NBR
1 08 080 10
FKM
1 08 080 09
17.
1
Muffler
PE porous
1 08 99 35
PE porous
1 08 499 35
BZ
1 08 499 86
18.
1
Air adapter
PP
1 08 46 28
20.
1
Tube
PP
1 10 96 28
Al
1 10 96 60
AISI 316
1 10 96 52
35.
1
Center housing complete
PE conductive
1 10 11 21
99.
1
Air valve key (SK4)
diverse
1 08 58 00

8I DELLMECO I AODD DIAPHRAGM PUMPS
5.2. DM 20/75, DM 25/125
1
2
3
4
5
6
7
9
11
12
14
15
18
13
16
30
17
Flange Connections: PN10 DIN 2576 (option F7),
ANSI 150 RF-SO (option F8), PN16 DIN 2277/2278
(option F9)
7
80
Split Connections (option S)
99
M4 ground hole
location

9I DELLMECO I AODD DIAPHRAGM PUMPS
Spare parts list for DM 20/75 and DM 25/125 pumps
MATERIAL
DM 20/75
DM 25/125
1.
2
Pump housing
Al
3 20 01 60
3 25 01 60
Al + PTFE
3 20 01 61
3 25 01 61
AISI 316
3 20 01 52
3 25 01 52
Cast iron
3 20 01 65
3 25 01 65
2.
1
Center housing
PE conductive
1 15 10 21
1 25 10 21
3.
2
Suction/Discharge ports
Al
3 20 30 60
3 25 30 60
AISI 316
3 20 30 52
3 25 30 52
Cast iron
3 20 30 65
3 25 30 65
Suction/Discharge ports-twin
(Split Connections)
Al
3 20 31 60
3 25 31 60
AISI 316
3 20 31 52
3 25 31 52
1
Suction port-drum
Al
3 20 33 60
3 25 33 60
AISI 316
3 20 33 52
3 25 33 52
4.
2
Diaphragm
TFM (PTFE)
1 15 50 05
1 25 50 05
EPDM
1 15 50 08
1 25 50 08
NBR
1 15 50 10
1 25 50 10
EPDM/TFM/PFA
1 15 50 00
-
5.
4
Valve balls
PTFE
1 15 60 23
1 25 60 23
EPDM
1 15 60 08
1 25 60 08
NBR
1 15 60 10
1 25 60 10
AISI 316
1 15 60 52
1 25 60 52
Polyurethane
1 15 60 07
1 25 60 07
Ceramic
1 15 60 90
1 25 60 90
6.
4
Valve ball stopper
AISI 304
3 20 39 50
3 25 39 50
AISI 316
3 20 39 52
3 25 39 52
7.
4
Sealing inlet/outlet –complete
NBR
3 20 70 10
3 25 70 10
EPDM
3 20 70 08
3 25 70 08
FEP/Silicone
3 20 70 03
3 25 70 03
FEP/FKM
3 20 70 04
3 25 70 04
9.
6
Housing bolt
AISI 304
3 20 42 50
3 25 42 50
11.
4
Shock absorber
NR/St37
1 15 69 06
1 25 69 06
NR/AISI 304
1 15 69 52
1 25 69 52
12.
12
Nut with washer
AISI 304
1 15 45 59
1 25 45 59
13.
1
Air valve
PET/NBR
1 15 020 31
1 15 020 31
PET/FKM
1 15 020 32
1 15 020 32
14.
1
Shaft
AISI 304
1 15 40 50
1 25 40 50
15.
6
O-ring, air valve
NBR
1 15 080 10
1 15 080 10
FKM
1 15 080 09
1 15 080 09
16.
2
Center housing seal
PE
1 15 85 22
1 25 85 22
17.
1
Muffler
PE porous
1 15 99 35
1 15 99 35
PE porous
1 15 499 35
1 15 499 35
BZ
1 08 99 86
1 08 99 86
BZ
1 15 499 86
1 15 499 86
18.
1
Air adapter
PP
1 15 46 28
1 15 46 28
20.
1
Tube
PP
1 15 96 28
1 25 96 28
Al
1 15 96 60
1 25 96 60
AISI 316
1 15 96 52
1 25 96 52
30.
2
O-ring for center housing seal
NBR
1 15 85 10
1 25 85 10
35.
1
Center housing complete
PE conductive
1 15 11 21
1 25 11 21
80.
2
Shaft allen pin screw
AISI 304
1 15 540 50
1 25 540 50
99.
1
Air valve key (SK4)
diverse
1 08 58 00
1 08 58 00

10I DELLMECO I AODD DIAPHRAGM PUMPS
5.3. DM 40/315, DM 50/565
1
2
3
4
5
6
7
7
9
11
12
14
15
18
13
16
30
Flange Connections: PN10 DIN 2576 (option F7),
ANSI 150 RF-SO (option F8), PN16 DIN 2277/2278
(option F9)
17
80
Split Connections (option S)
99

11I DELLMECO I AODD DIAPHRAGM PUMPS
Spare parts list for DM 40/315 and DM 50/565 pumps
MATERIAL
DM 40/315
DM 50/565
1.
2
Pump housing
Al
3 40 01 60
3 50 01 60
Al+PTFE
3 40 01 61
3 50 01 61
AISI 316
3 40 01 52
3 50 01 52
Cast iron
3 40 01 65
3 50 01 65
2.
1
Center housing
PE conductive
1 40 10 21
1 50 10 21
3.
2
Suction/Discharge ports
Al
3 40 30 60
3 50 30 60
AISI 316
3 40 30 52
3 50 30 52
Cast iron
3 40 30 65
3 50 30 65
Suction/Discharge ports-twin
(Split connections)
Al
3 40 31 60
3 50 31 60
AISI 316
3 40 31 52
3 50 31 52
4.
2
Diaphragm
TFM (PTFE)
1 40 50 05
1 50 50 05
EPDM
1 40 50 08
1 50 50 08
NBR
1 40 50 10
1 50 50 10
5.
4
Valve balls
PTFE
1 40 60 23
1 50 60 23
EPDM
1 40 60 08
1 50 60 08
NBR
1 40 60 10
1 50 60 10
AISI 316
1 40 60 52
1 50 60 52
Polyurethane
1 40 60 07
1 50 60 07
6.
4
Valve ball stopper
AISI 304
3 40 39 50
3 50 39 50
AISI 316
3 40 39 52
3 50 39 52
7.
4
Sealing inlet/outlet –complete
NBR
3 40 70 10
3 50 70 10
EPDM
3 40 70 08
3 50 70 08
FEP/Silicone
3 40 70 03
3 50 70 03
FEP/FKM
3 40 70 04
3 50 70 04
9.
8
Housing bolt
AISI 304
3 40 42 50
3 50 42 50
11.
4
Shock absorber
NR/St37
1 25 69 06
1 40 69 06
NR/AISI 304
1 25 69 52
1 40 69 52
12.
16
Nut with washer
AISI 304
1 40 45 59
1 50 45 59
13.
1
Air valve
PET/NBR
1 40 020 31
1 40 020 31
PET/FKM
1 40 020 32
1 40 020 32
14.
1
Shaft
AISI 304
1 40 40 50
1 50 40 50
15.
6
O-ring
NBR
1 40 87 10
1 40 87 10
FKM
1 40 87 09
1 40 87 09
16.
2
Center housing seal
PE
1 40 85 22
1 50 85 22
17.
1
Muffler
PE porous
1 40 99 35
1 50 99 35
PE porous
1 40 499 35
1 50 499 35
BZ
1 40 99 86
1 40 99 86
BZ
1 40 499 86
1 50 499 86
18.
1
Air adapter
PP
1 40 46 28
1 40 46 28
30.
2
O-ring for center housing seal
NBR
1 40 85 10
1 50 85 10
35.
1
Center housing complete
PE conductive
1 40 11 21
1 50 11 21
80.
2
Shaft allen pin screw
AISI 314
1 40 540 50
1 50 540 50
99.
1
Air valve key (SK4)
diverse
1 08 58 00
1 08 58 00

12I DELLMECO I AODD DIAPHRAGM PUMPS
5.4. DM 80/850 (Aluminium version only)
11
12
13
14
1
5
4
3
2
26
26
7
7
9
15
16
17
18
30
80
81
99

13I DELLMECO I AODD DIAPHRAGM PUMPS
Spare parts list for DM 80/850 pump (Aluminium version only)
MATERIAL
DM 80/850
1.
2
Pump housing
Al
3 80 01 60
2.
1
Center housing
PE conductive
1 80 10 21
3.
2
Suction/Discharge ports
Al
3 80 30 60
4.
2
Diaphragm
TFM (PTFE)
1 80 50 05
EPDM
1 80 50 08
NBR
1 80 50 10
5.
4
Valve balls
PTFE
1 80 60 23
EPDM
1 80 60 08
NBR
1 80 60 10
7.
4
Sealing inlet/outlet –cpl.
NBR
3 80 70 10
EPDM
3 80 70 08
9.
8
Housing bolt
AISI 304
3 80 42 50
11.
4
Shock absorber
NR/St37
1 80 69 06
12.
8
Nut with washer
AISI 304
1 80 45 59
13.
1
Air valve
PET/NBR
1 80 020 31
PET/FKM
1 80 020 32
14.
1
Shaft
AISI 304
1 80 40 50
15.
6
O-ring, air valve
NBR
1 80 080 10
FKM
1 80 080 09
16.
2
Center housing seal
PE
1 80 85 22
17.
1
Muffler
Misc
1 80 99 00
18.
1
Air adapter
PP
1 80 46 28
26.
2
Valve stopper, cpl.
AISI 304 + PTFE
3 80 139 00
30.
2
O-ring for center housing seal
NBR
1 80 85 10
35.
1
Center housing complete
PE conductive
1 80 11 21
80.
2
Shaft allen pin screw
AISI 304
1 80 540 50
81.
1
Muffler adapter
PE conductive
1 80 299 21
99.
1
Air valve key (SK4)
diverse
1 08 58 00

14I DELLMECO I AODD DIAPHRAGM PUMPS
6. Assembly
7. Installation
7.1.Installing the pump
1) Decide where the pump is to be installed and secure a site.
Note:
-The suction lift should be kept as short as possible.
-Sufficient space around the pump for maintenance must be provided.
When fixing the pump in place, use the cushions on the pump base. The tied-down bolts should be tightened
a little at a time to secure the pump.
SELF PRIMING APPLICATION
Suction lift capability may vary depending on the construction materials and
application parameters. The range is from 5 meters dry to 9 meters in a primed
condition (values calculated for pumping water at 20 degrees Celsius).
SUBMERGED OPERATION
All pumps may operate in full submersion. Construction materials must be compatible
with surrounding liquid and the air exhaust must be placed above the liquid level.
POSITIVE SUCTION HEAD
Common as a method of drawing off the bottoms of holding tanks and clarifiers.
Optimum inlet pressure should be kept at 0.2-0.3 bar.
!
CAUTION
When installing accessories prevent any foreign matter from getting into the product.
Otherwise malfunction of the air-valve may follow.

15I DELLMECO I AODD DIAPHRAGM PUMPS
Size
DM 15/25
DM 20/75
DM 25/125
DM 40/315
DM 50/565
DM 80/850
Torque values for
housing bolts [Nm]:
6
8
13
17
22
25
Torque values for
valve stoppers [Nm]:
5
7
7
8
8
-
!
CAUTION
!
WARNING
!
CAUTION
Vibration generated by pump operation should be absorbed. Take it into consideration when mounting it.
When using the pump in submerged position, follow the steps below:
- Verify the corrosion resistance of each component of the pump. DO NOT expose the pump to any fluid
for which it does not have proper corrosion resistance.
- Exhaust should direct outside, not into the fluid in which the pump is submerged.
The running pump may generate noise. Its level will depend upon conditions of use (kind of fluid being
pumped, supply air pressure and discharge pressure).
The end of the hose must be equipped with a pit, a protection box, etc. at the end of the hose in case the
diaphragm gets damaged and a leakage of the fluid follows.
Pump exhaust should be directed to a safe place, away from people, animals and food.
Before putting the pump into operation as well as after some hours of pumping, the housing bolts have to be
fixed according to the torque data of the following schedule, as the elements of construction “settle”.
Fixing the bolts is necessary as well after longer periods of stoppage, at extreme temperature variations, after
transport and dismantling the pump.

16I DELLMECO I AODD DIAPHRAGM PUMPS
7.2. Connecting the ground wire
a) When installing the conductive pump, be sure to connect the ground wire at the specified position.
b) Ground wires should be connected to peripheral equipment and piping as well.
c) Use 2.0 mm2minimum ground wire.
8.Connection
8.1. Connecting fluid piping
flexible
connection
air shut-off
valve
combined air
filter and
regulator
needle
valve
AIR SUPPLY
flexible connection
vacuum
gauge
shut-off
valve
shut-off
valve
pressure
gauge
SUCTION
DISCHARGE
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.
!
WARNING
Ground wires must be connected to the piping and any other peripheral equipment. When operating the
pump make sure it is properly grounded. Otherwise friction between the parts and abrasion caused by
some fluids flowing inside the casing may generate static electricity. In addition it may cause fire or
electric shock, depending on the type of fluid being pumped and the installation environment (such as
gases in the air or the surrounding mixtures).

17I DELLMECO I AODD DIAPHRAGM PUMPS
8.2. Connecting air piping
1) Connect an air valve, air filter, regulator to a hose connected to the compressor. Install items near the pump.
2) Connect the hose from the peripheral equipment to the air valve of the pump's supply port.
Note:
The diameter of the piping should be the same as the diameter of the pump supply port in order to supply sufficient air.
Peripheral equipment with sufficient airflow should be chosen to meet the requirement of the pump air consumption.
It must be installed nearest the pump unit, even using dry air. Usage and stability of air pressure must be considered.
!
WARNING
!
CAUTION
A hose must be flexible to absorb pump vibration. The hose must be grounded.
There must 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. The hose must be of more
than sufficient pressure rating.
Use a hose of a diameter the same as or larger than the pump's ports. If the diameter of a hose is
smaller, it will affect the pump's performance or cause its malfunction.
Keep a vessel below the relief valve to catch any drain off.
The product has been inspected using clean water at 8 bar discharge pressure.
Whenyouusing the hose andpit etc,makesuretouseamodelwithappropriatecorrosionresistanceforthe fluidto
be pumped.
Before starting work, make sure that the air compressor is shut off.

18I DELLMECO I AODD DIAPHRAGM PUMPS
9. Operation
9.1. Method of operation
1) Start the air compressor.
2) Open the air valve. Using a regulator adjust the supply air pressure to within the permissible range.
3) Open the flow valve on the discharge side.
4) First, check that fluid is flowing inside the piping and is being pumped to the discharge side, and then fully open the
air valve.
9.2. Flow adjustment
Adjust the flow valve on the discharge side, or adjust the supply air pressure.
!
CAUTION
!
CAUTION
!
CAUTION
Before starting the pump, check that all piping is properly connected.
Before starting the pump, check that all the bolts are securely tightened.
Check that the regulator and the drain valve on the discharge side are closed and that the valve on
the suction side is opened.
Ø Do NOT open the air valve suddenly.
The supply air pressure may initially rise during closing the flow valve. Make sure that the pressure is kept
within the normal operating range.
The permissible suction flow speed can vary depending upon the viscosity and specific gravity of the fluid,
the suction stroke and other factors. However in case of a rapid growth of the pump speed (flow speed of
fluid), cavitations will occur This will reduce pump performance and may cause a malfunction. In order to
prevent cavitations, adjust the supply air pressure and the flow.
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.

19I DELLMECO I AODD DIAPHRAGM PUMPS
9.3. Shutdown
Close the air valve of the pump and shut off the supply air.
10. Method of cleaning
1) Remove the hose from the suction side of the pump.
2) Close the flow valve on the discharge side and open the drain valve. Then start air pressure for a while to
discharge possibly much fluid remaining inside the pump.
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, the kind appropriate for the type of fluid pumped. Next connect the
suction-side and the discharge-side hoses of the pump.
5) Start the pump air pressure slowly, and let the cleaning solution circulate for sufficient cleaning.
6) Flush with clean water.
7) Remove the hose from the suction side of the pump, run the pump for a while to purge the pump of remaining
fluid as much as possible.
!
WARNING
!
CAUTION
!
CAUTION
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. Therefore after finishing work the pump must be purged of
the remaining fluid. Otherwise when starting the pump again, the diaphragm may get damaged and the
centre rod may bend.
Keep a vessel below the relief valve for any drain off.
Be careful! - Fluid under pressure will gush out the moment you open the valve.
If the pump is unused for a prolonged period, purge and clean it.
Make sure that compressed air is not supplied to the pump BEFORE you start cleaning the pump.
Make sure that the pump is not pressurized BEFORE you start cleaning the pump.

20I DELLMECO I AODD DIAPHRAGM PUMPS
11. Daily check
Before starting pump operation, conduct the following check procedures every day. In case there
appears any irregularity, do NOT start running the pump until the cause of the irregularity has been
determined and corrective measures have been taken.
a)Make sure that there is no leakage of fluid from any connection part or the pump.
b)Make sure that there are no cracks in the pump casing or piping.
c) Check the tightness of every bolt of the pump.
d)Make sure that the connection parts of the piping and peripheral equipment are not loose.
e)Make sure that any parts of the pump that are to be replaced at regular intervals have been
changed.
12. Possible problems
12.1. Pump does not run
Cause
Action to take
The exhaust port (muffler) of pump is clogged with
sludge.
Check and clean the exhaust port and muffler.
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.
The flow valve on the discharge side is not open.
Open the flow valve on the discharge side.
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.
!
CAUTION
Be extremely careful when removing piping - the fluid will gush out.
After cleaning with clean water, turn the pump upside-down to let the water flow out.