The document discusses Herold, a German company that produces WK-Pumps for use in food and sugar industries. Key points: - Herold developed the first helical twisted rotors in 1985 and received a patent for the innovative pump design. - WK-Pumps have high quality, gentle media transport, and meet stringent hygienic standards required for food applications. - Herold takes pride in their pumps' long lifespans and ability to operate worldwide in large corporations and small businesses.

1. Food and Sugar Industry
Optimizing production processes with WK-Pumps.

2. Traditionally Innovative
The Company for your Success
Pump performance of highest quality, inventive
talent and satisfied customers. There are many
things that motivate the staff of Herold.
Gerd Langer More than 20 years have passed since acknowledged by our customers, including
Dipl. Ind. Designer Herold developed and built the first the global corporation SKF, which named
CEO helical twisted rotors, a convincing Herold Supplier of the Year 2006. We are
technology that prompted application very proud that our WK-Pumps, built in
for our first patent. Upper Franconia, Germany, are operating
worldwide in the factories of large national
Herold is proud that, even after 20 years, and multinational corporations, as well as
not only does the quality of the pumps small family run operations, a guarantee
remain outstanding, but also our service. that those corporations have trouble-free
And, in both respects, we continually strive production.
to be better. Our success is constantly
1867 1985 1988 2009
1867 1988
Founded by Filing an application for
the Herold family as the patent of the first WK-
an iron foundry and Pumps with by 90° helical
machine factory. 1985 twisted rotors and triangle- 2009
Development and filing an shaped inlet and outlet Optimization and
application for a patent for reapplication for a patent
helical twisted rotors for 90° twisted rotors
with sinusoidal shape

3. Requirements of Highest Standard
Herold WK-Pumps in the food industry
The food industry especially demands very
high standards - one more reason to focus
on quality.
You eat with your eyes. The whole the media passes. All parts of the WK-
nuts that you see when you bite into a Pumps that touch the media are made
chocolate are primarily a result of the of metal alloys of the highest standard,
gentle positive displacement of media, preventing metal bits from breaking off into
a patented principal of the WK-Pumps. the media. The hygenic operation of our
pump is remarkable, and ensures purity of
Gentle positive displacement of media is media. No risk for contamination. In 2006,
but one of the many demands on pump the American Standard Association issued
processes used in the food industry. a 3A Certificate for Herold WK-Pumps.
Another important factor is the demand
for a hygenic environment through which
Applications of the WK-Pumps
in the Food Industry
· Sugar and starch industry
· Chocolate and candies
· Cheese and dairy
· Fruit and fruit juice concentrate
· Meat and sausage products
· Pastry and pie products
· Canned food
· ...

4. Herold WK-Pumps
An innovative idea that is widely accepted
Due to its outstanding technology the Herold WK-Pumps
show considerable advantages in food pumping applica-
tions compared to other pumps on the market.
Due to its outstanding technology the This results in the lowest pulsation rate
WK-Pumps show considerable advan- worldwide. The gentle way of transporting
tages in food pumping applications a medium is ideal for its homogeneity. The
compared to other pumps on the exceptionally quite run guarantees a long
market. Ordinary positive displacement service life of pumps, drive units, valves
pumps have “portion-wise” pump action slide valves and seals. Therefore in most
at the suction and discharge end. The cases the installation of compensation
two counter-turning rotors however are joints can be omitted. As the revolving
characterized by a smooth continuous rotors do not touch each other or the
flow. pump housing and as both having a high
degree of hardness no foreign matter gets
into the medium and impurifies it.
Suction inlet Discharge
outlet
due to rotation of the by further rotation the due to the by 90° and discharged with
helical twisted rotors liquids are locked in twisted rotors the liquids the worldwide lowest
a vacuum is created, between the rotors and are transported without pulsation rate
which draws liquids into the rotor housing interruption
the pumping chamber

5. Salient Details
Technical features and seal design of Herold WK-Pumps
The worldwide lowest pulsation rate is only Seals are selected and
one of many outstanding properties of the adapted to each individual
pumping process:
innovation technology of Herold WK-Pumps.
· atmospheric separation
· cartridge type mechanical seal
· Running characteristics: worldwide lowest pulsation rate · can run in both directions
· Economy: lowest energy consumption · pressure springs not in contact
· Dry run stability: quench liquid cools seal system with medium
· Treating medium with care: even top quality without trituration · O-rings with FDA certificate
· Durability: extraordinary lifetime and process safety are selected for each specific
· Purity: hermetically sealed, easy CIP process, easy maintenance medium
· Performance: higher efficiency due to our dynamically shaped pumphousing · Highly resistant materials of the
· Field of application: from low to high viscosity, abrasive or sheer-sensitive sealing faces are based on the
media and fluids with solid particles. latest scientific knowledge
· Flexibility: option of switching pumping direction · Quench system for cooling and
lubrication
Suction and discharge
configurations are designed
to meet individual customer
needs.
Sinusoidal Sinusoidal Standard Standard
sealing area sealing line sealing area sealing line
Twisted sinusoidal shaped rotors
In comparison to ordinary Roots pumps lines of the suction and discharge area of
the rotors of the Herold WK-pumps are the pump housing match the sinusoidal
twisted by 90°. Its special, optimized and cosinusoidal rotor configuration.
sinusoidal design implements an increased This prevents turbulence. Due to the
opening area on the same rotation angle, aerodynamically shaped suction inlet and
a very medium-sensitive pumping action discharge outlet the risk of cavitation is
and a reduced velocity of flow. The sealing highly reduced.

6. Ideal for the Food Industry
Pump type 01/02 and 06/07
Pump type 01/02
Material of the pump parts which
Type Capacity Pressure RPM Flange
are in contact with the medium: in m3/h** max. max.
Ni-Resist or stainless steel min. max. bar*** 1/min Ø in mm
02.005 2 12 9 400 50
02.005 V 2 12 9 400 80/45°
01.010* 4 24 9 400 100
01.010 V* 4 24 9 400 150/45°
01.014 6 34 7 400 100
01.014 V 6 34 7 400 150/45°
01.035 15 84 7 400 125
01.035 V 15 84 7 400 200/45°
02.050 18 105 8 350 150
02.050 V 18 105 8 350 250/45°
02.100 36 180 6 300 200
02.100 V 36 180 6 300 300/45°
02.350 V* 42 735 9 350 500/45°
Pump type 06/07
Material of the pump parts which are in contact Type Capacity Pressure RPM Inlet /
with the medium: Stainless steel, other material in m3/h** max. max. Outlet
on request min. max. bar*** 1/min Ø in mm
07.005 2 12 9 400 50
06.010 4 24 8 400 80
06.014 6 34 7 400 80
06.028 12 68 8 400 100
06.035 15 84 7 400 100
07.005* 2 12 16 400 50
07.014* 6 34 16 400 80
* Special pump models only on request!
** 1m³ (1000 l) ≈ 264 US gal ≈ 220 Imp gal ≈ 35.31 ft³
*** 1 bar ≈ 14.2 psi
The maximum RPM depends on the type of medium to be pumped and
has to be adjusted to its viscosity.
RPM, pressure and viscosity are relative.

7. Route to Success
Quality from one source
We know we have reached our goal when our custo-
mers express their enthusiasm about and appreciation
for the WK-Pumps by recommending Herold to other
businesses.
We have achieved this goal by offering no compromise with our product quality.
an outstanding product completely We ensure a high degree of operational
designed, created and assembled in reliability for each WK-Pump.
one place by one manufacturer, from Our guarantee: If, for any reason, a pump
the initial consultation all the way part requires replacement, or additional
through to delivery. parts or accessories are required, Herold
will provide them, and all of them will be
Before each pump leaves our factory, it is made by Herold specifically to meet our
put through rigorous testing. We accept customer‘s requirements.
1 3 5
2 4
conception pump functional
defining construction testing
quote pump
fixation production

8. © 2010 Herold & Co. GmbH. All Rights Reserved. See the patent and other legal notices at www.herold-gefrees.de.
Manufacturing and Foundry
CNC Machining
Wendelkolben® Pumps
Anaerobic waste water treatment
Herold & Co. GmbH
Hauptstraße 12
D-95482 Gefrees
Tel. +49(0)9254-970-0
Fax +49(0)9254-970-40
www.herold-gefrees.de