Food and Sugar IndustryOptimizing production processes with WK-Pumps.

1867 1985 20091988

More than 20 years have passed since

Herold developed and built the first

helical twisted rotors, a convincing

technology that prompted application

for our first patent.

Herold is proud that, even after 20 years,

not only does the quality of the pumps

remain outstanding, but also our service.

And, in both respects, we continually strive

to be better. Our success is constantly

acknowledged by our customers, including

the global corporation SKF, which named

Herold Supplier of the Year 2006. We are

very proud that our WK-Pumps, built in

Upper Franconia, Germany, are operating

worldwide in the factories of large national

and multinational corporations, as well as

small family run operations, a guarantee

that those corporations have trouble-free

production.

Pump performance of highest quality, inventive

talent and satisfied customers. There are many

things that motivate the staff of Herold.

Gerd Langer

Dipl. Ind. Designer

CEO

1867

Founded by

the Herold family as

an iron foundry and

machine factory. 1985

Development and filing an

application for a patent for

helical twisted rotors

1988

Filing an application for

the patent of the first WK-

Pumps with by 90° helical

twisted rotors and triangle-

shaped inlet and outlet

2009

Optimization and

reapplication for a patent

for 90° twisted rotors

with sinusoidal shape

Traditionally InnovativeThe Company for your Success

Requirements of Highest Standard Herold WK-Pumps in the food industry

You eat with your eyes. The whole

nuts that you see when you bite into a

chocolate are primarily a result of the

gentle positive displacement of media,

a patented principal of the WK-Pumps.

Gentle positive displacement of media is

but one of the many demands on pump

processes used in the food industry.

Another important factor is the demand

for a hygenic environment through which

the media passes. All parts of the WK-

Pumps that touch the media are made

of metal alloys of the highest standard,

preventing metal bits from breaking off into

the media. The hygenic operation of our

pump is remarkable, and ensures purity of

media. No risk for contamination. In 2006,

the American Standard Association issued

a 3A Certificate for Herold WK-Pumps.

The food industry especially demands very

high standards - one more reason to focus

on quality.

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

· ...

Herold WK-PumpsAn innovative idea that is widely accepted

Due to its outstanding technology the

WK-Pumps show considerable advan-

tages in food pumping applications

compared to other pumps on the

market. Ordinary positive displacement

pumps have “portion-wise” pump action

at the suction and discharge end. The

two counter-turning rotors however are

characterized by a smooth continuous

flow.

This results in the lowest pulsation rate

worldwide. The gentle way of transporting

a medium is ideal for its homogeneity. The

exceptionally quite run guarantees a long

service life of pumps, drive units, valves

slide valves and seals. Therefore in most

cases the installation of compensation

joints can be omitted. As the revolving

rotors do not touch each other or the

pump housing and as both having a high

degree of hardness no foreign matter gets

into the medium and impurifies it.

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 rotation of the

helical twisted rotors

a vacuum is created,

which draws liquids into

the pumping chamber

by further rotation the

liquids are locked in

between the rotors and

the rotor housing

due to the by 90°

twisted rotors the liquids

are transported without

interruption

and discharged with

the worldwide lowest

pulsation rate

Suction inlet Discharge outlet

Salient Details Technical features and seal design of Herold WK-Pumps

· Running characteristics: worldwide lowest pulsation rate

· Economy: lowest energy consumption

· Dry run stability: quench liquid cools seal system

· Treating medium with care: even top quality without trituration

· Durability: extraordinary lifetime and process safety

· Purity: hermetically sealed, easy CIP process, easy maintenance

· Performance: higher efficiency due to our dynamically shaped pumphousing

· Field of application: from low to high viscosity, abrasive or sheer-sensitive

media and fluids with solid particles.

· Flexibility: option of switching pumping direction

The worldwide lowest pulsation rate is only

one of many outstanding properties of the

innovation technology of Herold WK-Pumps.

Twisted sinusoidal shaped rotors

In comparison to ordinary Roots pumps

the rotors of the Herold WK-pumps are

twisted by 90°. Its special, optimized

sinusoidal design implements an increased

opening area on the same rotation angle,

a very medium-sensitive pumping action

and a reduced velocity of flow. The sealing

lines of the suction and discharge area of

the pump housing match the sinusoidal

and cosinusoidal rotor configuration.

This prevents turbu lence. Due to the

aerodynamically shaped suction inlet and

discharge outlet the risk of cavitation is

highly reduced.

Seals are selected and

adapted to each individual

pumping process:

· atmospheric separation

· cartridge type mechanical seal

· can run in both directions

· pressure springs not in contact

with medium

· O-rings with FDA certificate

are selected for each specific

medium

· Highly resistant materials of the

sealing faces are based on the

latest scientific knowledge

· Quench system for cooling and

lubrication

Sinusoidalsealing area

Sinusoidal sealing line

Standardsealing area

Standard sealing line

Suction and discharge

configurations are designed

to meet individual customer

needs.

Ideal for the Food IndustryPump type 01/02 and 06/07

Pump type 01/02

Material of the pump parts which

are in contact with the medium:

Ni-Resist or stainless steel

Pump type 06/07

Material of the pump parts which are in contact

with the medium: Stainless steel, other material

on request

Type Capacityin m3/h**

Pressuremax.

RPMmax.

Inlet / Outlet

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

Type Capacityin m3/h**

Pressuremax.

RPMmax.

Flange

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°

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.

***

***

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4

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

an outstanding product completely

designed, created and assembled in

one place by one manufacturer, from

the initial consultation all the way

through to delivery.

Before each pump leaves our factory, it is

put through rigorous testing. We accept

no compromise with our product quality.

We ensure a high degree of operational

reliability for each WK-Pump.

Our guarantee: If, for any reason, a pump

part requires replacement, or additional

parts or accessories are required, Herold

will provide them, and all of them will be

made by Herold specifically to meet our

customer‘s requirements.

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Herold & Co. GmbH

Hauptstraße 12

D-95482 Gefrees

Tel. +49(0)9254-970-0

Fax +49(0)9254-970-40

© 2010 Herold & Co. GmbH. All Rights Reserved. See the patent and other legal notices at www.herold-gefrees.de.