KRAL Screw Pumps Brochure
KRAL Screw Pumps Brochure
KRAL Screw Pumps Brochure
www.kral-usa.com
Pumps
Customer satisfaction is
generated through experience
with our durable and reliable
pumps together with an open
partnership with our customers. We offer a wide array of
standard pumps as well as
custom solutions.
KRAL screw pumps are self-priming displacement pumps. The specially designed profiles and tight tolerances of the three rotating screws form isolated and sealed chambers. Only through this operational principle
can we ensure continuous and smooth pumping without damaging the liquid or creating turbulence.
Housing.
Clear advantages.
Overflow valve.
Ball bearing.
Self priming.
Quiet, no vibration.
Low pulsation.
Great suction lift.
High efficiency.
Compact.
Long lasting.
Simple construction.
High speed capability.
Directly driven.
For low and high viscosity.
Easy maintenance.
Idle screw.
Drive screw.
Shaft seal.
Operating Principle.
The screws are enclosed by
the housing, forming tight
clearances. The pumped liquid
itself lubricates all the moving parts. Axial thrust acting
on the hardened drive and
idle screws is compensated
by using precisely shaped
balancing cylinders. A sliding
bearing made of special materials absorbs axial and radial
forces on the idle screws. The
sealing chamber housing for
the shaft seal has only suction
pressure applied to it. Just
the right flush volume flows
from the pressure side to the
sealing chamber and serves to
cool and lubricate the seal.
Screw pumps have a constant, free cross-sectional area that ensures continuous displacement
of the pumped liquid.
Pumps
High flow rates and pressures with a very compact footprint, low pulsation and great control
capabilities these are the clear technical advantages of a screw pump.
Great control capabilities.
The flow rate of a screw pump
is directly proportional to the
speed of rotation.
The flow rate can thus be
finely adjusted by changing
the rotational speed.
Qv flow
pdischarge
pvapor
Pumps
Mechanical Engineering.
Marine.
Series CK, CL, CG.
Pressure up to 1,450 psi.
Viscosity up to 10,000 cSt.
C pumps are generally used in the mechanical engineering
field for lube oil applications and in hydraulic systems.
Power Generation.
Series CK, CL, CG.
Pressure up to 1,450 psi.
Viscosity up to 10,000 cSt.
Chemical Engineering.
Series CK, CL, CG.
Pressure up to 1,450 psi.
Viscosity up to 1,000,000 cSt.
CG pumps are used in the chemical industry in special applications such as with polyurethanes. For toxic liquids like
isocyanate, magnetically coupled pumps are common.
Pumps
Individual customization.
For the CG pump series,
KRAL offers a variety of
housings, relief valves and
connections. The housing
is available in cast iron or
steel. Versions with a heating jacket are available for
high-viscosity liquids.
Tailor-made solution.
As an example, this picture
shows a complete hydraulic
system mounted on a frame
to provide protection during
transportation, maintenance
and operation. The compact
pump-hydraulic package is
completely assembled and
C Series at a Glance.
The wide range of products in the flexible C series with a variety of pumps
and pump stations heres an overview.
460 gpm.
940 gpm.
940 gpm.
Temperature:
Pumps
10
Seal housing.
Depending on the operational requirements various shaft seal
options are possible for the CL series (see page 15).
Flexible connections.
If the outer casing is made from fabricated steel, then almost
any positioning, direction, size, type and rating of flange can
be achieved (see page 24). It can be ideally suited to match
the installation situation.
Housing variants.
Depending on the operational requirements cast iron or steel
housings are offered for the CG series.
11
Pumps
12
Hermetically sealed
F5
F4
F2
F3
F4
F2
F3
F1
Drive screw.
Balancing cylinder.
Magnetic coupling.
13
Pumps
Materials.
Standard housings are made
of a special aluminum alloy
or cast iron. Fabricated steel
casing is available for the
CG pump.
Safety.
C pumps can be equipped
with an internal overflow valve
to protect against overpressure. The CG series furthermore
offers optional external overflow or bypass valves.
Flanges.
A variety of connections such
as ANSI, SAE, EN DIN, JIS
(steel housing) are possible
for the C series. See page 24
for different possible
connection options.
14
Approvals.
Design standards.
API standards.
Hazardous locations.
API 676
API 614
API 682
API 685
Magnetic coupling.
Mechanical seal.
External bearing.
Internal bearing.
15
Pumps
16
17
Pumps
CK sizes 5 to 118.
CL_CK - Gre 5 - 118
350
90
118
300
80
105
85
55
74
200
40
55
150
42
25
250
65
100
32
15
5
0
0
500
1000
1500
2000
2500
3000
7,5
26
20
15
10
3500
50
4000
550
880
500
1800
1600
400
1400
660
300
1200
550
250
1000
450
200
800
370
275
150
210
100
160
235
600
400
200
50
0
0
500
1000
1500
2000
18
2500
3000
3500
350
5-10
15-26
32-42
55-85
105-118
l/min
5 to 10
15 to 26
32 to 42
55 to 85
105 to 118
gpm
2 to 3
5 to 8
10 to 14
19 to 27
32 to 38
psi
1,450
1,015
1,015
1,015
1,015
Temperature
F
300
300
300
300
300
1.5
10,000
1.5
10,000
1.5
10,000
1.5
10,000
1.5
10,000
145
145
145
145
145
160-210
235-275
370-450
550-880
cSt
min.
max.
Max. pressure at suction
flange
psi
l/min
160 to 210
235 to 275
370 to 450
550 to 880
gpm
53 to 69
75 to 90
117 to 143
173 to 279
psi
1,015
1,015
1,015
580
Temperature
F
300
300
300
300
cSt
min.
1.5
1.5
1.5
1.5
max.
10,000
10,000
10,000
10,000
145
145
145
145
psi
19
Pumps
CL sizes 5 to 118.
CL_CK - Gre 5 - 118
350
90
118
300
80
105
85
55
74
200
40
55
150
42
25
250
65
100
32
15
5
0
0
500
1000
1500
2000
2500
3000
7,5
26
20
15
10
3500
50
4000
550
880
500
1800
1600
400
1400
660
300
1200
550
250
1000
450
200
800
370
275
150
210
100
160
235
600
400
200
50
0
0
500
1000
1500
2000
20
2500
3000
3500
350
5-10
15-26
32-42
55-85
105-118
l/min
5 to 10
15 to 26
32 to 42
55 to 85
105 to 118
gpm
2 to 3
5 to 8
10 to 14
19 to 27
32 to 38
psi
1,450
1,450
1,450
1,450
1,450
Temperature
180
180
180
180
180
300
300
300
300
300
300
300
300
300
300
360
360
360
360
360
Magnetic coupling
360
360
360
360
360
1.5
10,000
1.5
10,000
1.5
10,000
1.5
10,000
1.5
10,000
Viscosity
cSt
min.
max.
Max. pressure at suction
flange
Stuffing box packing
psi
45
45
45
45
45
Mechanical seal
430
430
430
430
430
Magnetic coupling
230
230
230
230
230
160-210
235-275
370-450
550-880
l/min
160 to 210
235 to 275
370 to 450
550 to 880
gpm
53 to 69
75 to 90
117 to 143
173 to 279
psi
1,450
1,450
1,160
1,160
Temperature
180
180
180
180
300
300
300
300
300
300
300
300
360
360
360
360
Magnetic coupling
360
360
360
360
min.
1.5
1.5
1.5
1.5
max.
10,000
10,000
10,000
10,000
45
45
45
45
Viscosity
cSt
psi
Mechanical seal
430
430
430
430
Magnetic coupling
230
230
230
230
21
Pumps
CG sizes 15 to 118.
90
350
118
80
300
105
65
250
55
200
74
40
150
55
42
25
100
32
26
20
15
85
50
15
0
0
500
1000
1500
2000
2500
3000
3500
4000
1300
3550
1050
2850
5000
4000
1701
1501
2250
800
3000
1301
1101
951
851
880
660
550
450
370
550
250
160
2000
1000
275
235 210
0
0
500
1000
1500
2000
22
2500
3000
3500
1600
15-26
32-42
55-85
105-118
160-210
235-275
370-450
l/min
15 to 26
32 to 42
55 to 85
105 to 118
160 to 210
235 to 275
370 to 450
gpm
5 to 8
10 to 14
19 to 27
32 to 38
53 to 69
75 to 90
117 to 143
psi
1,450
1,450
1,450
1,450
1,450
1,450
1,450
Temperature
180
180
180
180
180
180
180
300
300
300
300
300
300
300
300
300
300
300
300
300
300
360
360
360
360
360
360
360
Magnetic coupling*
480
480
480
480
480
480
480
min.
1.5
1.5
1.5
1.5
1.5
1.5
1.5
max.
1,000,000
1,000,000
1,000,000
1,000,000
1,000,000
1,000,000
1,000,000
Viscosity
cSt
psi
45
45
45
45
45
45
45
Mechanical seal
430
430
430
430
430
430
430
1,450
1,450
1,450
1,450
1,450
1,450
1,450
Magnetic coupling*
550-880
851-951
1101-1301
1501-1701
2250-3550
l/min
550 to 880
851 to 951
1101 to 1301
1501 to 1701
2250 to 3550
gpm
173 to 279
251 to 312
359 to 417
491 to 569
718 to 1141
psi
1,450
1,450
1,450
1,450
1,450
Temperature
180
300
300
300
300
300
300
300
300
300
300
360
360
360
360
360
Magnetic coupling*
480
480
480
480
480
Viscosity
cSt
min.
1.5
1.5
1.5
1.5
1.5
max.
1,000,000
1,000,000
1,000,000
1,000,000
1,000,000
45
psi
Mechanical seal
430
430
430
430
430
1,450
1,450
1,450
1,450
1,450
Magnetic coupling*
23
Pumps
A) Inline flanges:
opposing connections.
The connections are opposite
of each other with the inlet
on the left and the outlet on
the right.
B) Inline flanges:
opposing connections.
The connections are opposite
of each other with the inlet
on the right and the outlet on
the left.
C) End suction:
axial pump inlet.
The pressure side is on
the side or on top. Outlet left.
D) End suction:
axial pump inlet.
The pressure side is on
the side or on top. Outlet right.
E) 90 arrangement.
Inlet on top, outlet right.
Connections can vary depending on the installation
position of pump.
F) 90 arrangement.
Inlet on top, outlet left.
Connections can vary depending on the installation
position of pump.
G) 90 arrangement.
Inlet right, outlet on top.
Connections can vary depending on the installation
position of pump.
H) 90 arrangement.
Inlet left, outlet on top.
Connections can vary depending on the installation
position of pump.
24
25
Pumps
26
27
Pumps
KRAL - USA, Inc., P.O. Box 2990, Matthews NC 28106, 901A Matthews-Mint Hill Road,
Matthews NC 28105, USA, Tel.: (704) 814-6164, Fax: (704) 814-6165, e-mail: sales@kral-usa.com
www.kral-usa.com