Kremlin-Rexson AIRMIX 20-50 FT Operation instructions

SPECIFICATIONS
STAINLESS STEEL
AIRMIX ® PUMPS
model
20-50 F and 20-50 FT
Manual : 1003 573.032.212
Date : 23/03/10 – Supersede : 26/08/08
Modif. : Update
ORIGINAL MANUAL
IMPORTANT : before assembly and start-up, please read and clearly understand all documents
relating to this equipment (professional use only).
PICTURES AND DRAWINGS ARE NON CONTRACTUAL. WE RESERVE THE RIGHT TO MAKE CHANGES WITHOUT PRIOR
NOTICE.
ADDITIONAL DOCUMENTATIONS FOR PUMPS, MODEL 20-50 F and 20-50 FT
SPARE PARTS :Wall mounted unit (doc. 573.120.050)
Air motor (doc. 573.045.050)
Fluid section (doc. 573.114.050)
Reversing block (doc. 573.087.040)
Air supply (doc. 573.403.050)
Atomizing air kit (doc. 573.035.050)
KREMLIN - REXSON
l
150, avenue de Stalingrad
93 245 - STAINS CEDEX – France
 : 33 (0)1 49 40 25 25 Fax : [phone]
www.kremlin-rexson.com

KREMLIN REXSON Page 1 Manual : 573.032.212
SPECIFICATIONS
STAINLESS STEEL AIRMIX PUMP ,
model 20-50 F and 20-50 FT
1. TECHNICAL FEATURES
Airoperated piston pump (stainless steel) - with a bellows seal fluid packing.
Low maintenance and ease of use - Use without lubrication.
Recommended for :
Supplying one or several spray guns,
Water-based or solvent-based paints whose viscosity is lower than 1 000 mPa/s.
Motor type .........................1000-4 or 1000-4 T
Pump body type ..........……… FLOWMAX 50 F
Fluid pressure ratio :
-theoritical ........................………….. 20/1
-effective ……………………………… 15/1
Wetted parts :
Hard chrome stainless steel,
Stainless steel, Carbide.
Tightness packings :
Bellows : Polyethylene
Upper, fixed : GT (polyethylene)
Lower, mobile : GT (polyethylene)
Air motor stroke
Air motor section
Hydraulic section
Delivery per cycle
Number of cycle
Fluid delivery (30 cycles).
Maximum air operating pressure
Maximum discharge pressure
Noise level
Maximum operating temperature
100 mm
100 cm2
5 cm2
100 cc
10
3 l
6 bar
90 bar
76 dBa
50°C
4 inch
15.5 sq.in
0.8 sq.in
3.5 oz
38 per gal
0.8 US Gal
88 PSI
1 305 PSI
76 dBa
122° F
Weight ...................................... 27 kg / 59.5 Lbs
FITTINGS
Bare pump Pump assembly
Air Inlet 1000-4 air motor : Female 3/8 BSP
1000-4 T air motor : Male 3/4 NPS Female 3/8 BSP (air supply)
Inlet Female 1/2 BSP Male 26 x 125
Fluid Outlet Female 3/8 NPS Male 1/2 JIC / # 5 JIC (filter outlet)
HOSES WITH FITTINGS
Pump air supply hose (minimum for a 5m / 16.5 ft length) : 16mm / 5/8"
Air hose (between"GUN AIR" regulator and spray gun) : 7 mm ID / 1/4 dia
AIRMIX fluid hose (between pump fluid outlet and spray gun) : 4,8 mm ID / 3/16 dia

KREMLIN REXSON Page 2 Manual : 573.032.212
DIMENSIONS
Ind. mm " Ind. mm. " Ind. mm " Ind. mm "
A 470 18.5 B 220 8.7 C 975 38.4 D 270 10.63
E 182 7.16 F 35 1.38 G 36,5 1.43 H 60 2.36
I 211,5 8.3 J Ø 7x 15 Ø 0.27x0.6 K Ø 17 Ø 0.67 L Ø 9 Ø 0.35
M Ø 9 Ø 0.35
D
C
B
A
E/F
E
G
H
F
I
J
K
L
M
= =
2. SERVICING
WARNING :
Before any action on the pump, shut off the compressed air supply and
depressurize the systems by triggering the spray gun.
The pump is manufactured under the ATEX agreement and can not be modified.
KREMLIN REXSON will not be held responsible for any failure to comply with that
instruction.
DISASSEMBLY / REASSEMBLY OF THE FLUID SECTION
Guards (motor cover, coupling shields, connectors,…) have been designed for a
safe use of the equipment.
The manufacturer will not be held responsible for bodily injury or failure and / or
property damage due to destruction, the overshadowing or the partial or total
removal of the guards.
Unscrew the fitting (38) and the screws (41 and 43) to remove the attachment fluid tube (39).

KREMLIN REXSON Page 3 Manual : 573.032.212
SUCTION VALVE (DOC. 573.114.050)
Unscrew the suction valve (35) by holding cylinder (27).
The ball (22) is secured on the valve (35) by means of a circlips (21).
Clean the parts.
Reinstall the suction valve (35) and the seal (23). Replace them if necessary.
EXHAUST VALVE AND MOBILE PACKING
Unscrew the cylinder (27) and pull it downwards.
Unscrew stuffing-box (33) to release GT seal (31) from exhaust valve (34).
Unscrew exhaust valve (34) by holding piston (24).
Remove ball (32).
Clean the parts and reinstall them. Replace seals if necessary.
UPPER TIGHTNESS SEAL
Unscrew the four screws (30).
Remove tightness seal (28) by pulling discharge flange (25) downward.
Replace tightness seal (28), O-Rings (29 and 11).
Reinstall the parts in the reverse order of the disassembly sequence.
DISASSEMBLY / REASSEMBLY OF THE COUPLING (WITH BELLOWS)
Disassemble the fluid section prior to carrying out the following procedure:
BELLOWS
Unscrew nuts (14) from the tie-rods.
Remove suction flange (1) and cylinder (2) by pulling them downwards.
Remove screws (12) to disconnect suction bearing (3) from air motor.
Disconnect intermediate piston (9) from air motor rod.
Remove coupling parts.
Remove bellows flange (4) by unscrewing screws (13) to free the upper part of the bellows.
Unscrew skirt (8) to free the lower part of the bellows.
Replace bellows (5).
When installing bellows push it into skirt firmly (8).
Insert intermediate piston (9) into bellows (5) and screw the skirt at the piston end.
Insert bellows and piston (9) into the suction bearing (3).
Install flange (4) in the suction bearing and tighten the whole with screw (13).
Connect bellows-piston set to motor rod and secure the whole on the lower support of the air motor by
using screws (12).
Reinstall fluid section piston (24) on intermediate piston (9).
Replace seals (11). Then install cylinder (2) and suction flange (1).
Install the whole on tie-rods and tighten it with nuts (14).

KREMLIN REXSON Page 4 Manual : 573.032.212
AIR MOTOR
Guards (motor cover, coupling shields, connectors,…) have been designed for a
safe use of the equipment.
The manufacturer will not be held responsible for bodily injury or failure and / or
property damage due to destruction, the overshadowing or the partial or total
removal of the guards.
REVERSING BLOCK (DOC. 573.045.050)
Disassemble cover (32) by removing CHc screws (33).
Dissociate female yoke (12) from the reversing block lever (9).
Dismount reversing-block by removing the screws (10 and 8).
Reinstall the new reversing-block in the reverse order of the
disassembly sequence.
CAUTION : the number of spirals must equally be distributed on each fastening parts in
order to get the above dimension.
Before reassembling the different components :
-Clean the parts with the appropriate cleaning solvent.
-Install new seals if it is necessary, after having lubricated them with PTFE grease.
-Lubricate the piston and the inside of the cylinder to prevent from damaging the seals.
-Install new parts if it is necessary.
31.85 mm
±0.5

KREMLIN REXSON Page 5 Manual : 573.032.212
ASSEMBLY INSTRUCTIONS
39
21
38
37
36
35
34
33
32
31
30
29
27
22
24
23
25
28
26
41
40
11
11
43
42
5
8
2
9
10
11
12
13
4
3
1
15
14
20 1
A 1
A 1
C 1
C 1
A 1
A 1
A 1
C 1
A 1
A 2
A 2
A 2
A 1
A 1
C 1
Index Instruction Description Part number
PTFE grease 'TECHNILUB' grease (10 ml) 560.440.101
Graphite grease Graphite grease box
(1 kg / 2.204 lb) 560.420.005
Medium strength
Aneorobic Pipe Sealant Loctite 577
A1
A2
C1