Ampco Pumps ZP4  – The Most Compact Circumferential Piston Pump in the Industry

Ampco Pumps ZP4 – The Most Compact Circumferential Piston Pump in the Industry

The NEW Ampco ZP4 and its compact design are perfect for sanitary low-flow and dosing applications. The compact design of the ZP4 delivers the accuracy, reliability and efficiency that you expect from a positive displacement pump.

The ZP4 separates itself from other sanitary pump options in this category because of its ZERO rotor to rotor contact design and durable stainless steel construction.

The ZP4 circumferential piston pump is designed to reduce any possibility of product zone contamination from pump wear.

Compact Circumferential Piston Pump

ZP4 Features

  • Couples directly to a Servomotor
  • ZERO rotor to rotor contact
  • NO wear parts in the product zone
  • Self-priming
  • Perfect for handling sensitive liquids with particulate
  • Front-loading seal design for ease of maintenance and clean-up
  • Non-galling Alloy 88 rotors
  • 316L stainless steel body
  • 304 stainless steel gear case

ZP4 Performance Overview

Model:  1
Max Discharge Pressure:  290 PSI / 20 BAR
Max Viscosity:  200,000 mPas
Displacement: .0016 Gal/Rev /.0062 l/Rev
Seal Specifications:  5 Seal Options

  • Single Mechanical
  • Double Mechanical
  • Single O-ring
  • Double O-ring
  • Lip Seal

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SLH-4G and SLH-4U Sanitary Twin Screw Pumps

SLH-4G and SLH-4U Sanitary Twin Screw Pumps

The Ampco Pumps SLH-4G and SLH-4U sanitary twin screw pumps excel at pumping high-viscosity products and are true dual-duty positive displacement pumps that can handle process and CIP applications.

As the first worldwide twin screw pump supplier, Bornemann introduced the hygienic SLH design of twin screw pumps in 2004 to the Food & Pharma industries. The design is based on 150 years of proven technology from Bornemann’s industrial twin screw pumps.

This experience aligned with the hygienic requirements of EHEDG and 3A Sanitary Standards make the SLH the world leader in sanitary twin screw pump technology. Ampco’s partnership with Bornemann makes this leading technology available in the United States and beyond with full distributor support and fast deliveries.

Ampco Pumps has decades of experience working with customers and understanding the food processing industry. The SLH-4G offers all the advantages of a hygienic twin-screw pump with a number of customized features and options. This provides the best solution for a wide range of applications.

Learn more:

hygienic twin screw pump




Ampco Pumps ZP3 SERIES – The New Standard in Positive Displacement Pumps

Ampco Pumps ZP3 SERIES – The New Standard in Positive Displacement Pumps

The ZP3 from #AmpcoPumps is an excellent choice when pumping very high viscus liquids. Watch this video, demonstrating the manufacturing of soup cubes.

The raw material has a viscosity of more than 2 million mPas. It is very dry and needs a feeding screw to enter the rectangular pump inlet. The feeding conveyer overfeeds the pump with 120% to prevent air pockets. You also may see the very low pulsation with the Ampco ZP3 #circumferentialpistonpump. The ZP3 may handle up to 35 bar and is suitable for viscosities from 1 to 2 million mPas.

Other features are self-priming, suitable for metering applications, sensitive handling of liquids also with sensitive pieces, available in an aseptic version, #EHEDG certified and easy service.

The patented ZP3 Series positive displacement pump is the best choice for sanitary food and beverage processing because only the ZP3 is fully CIP-able without modification, while maintaining full efficiency. The ZP3 Series is EHEDG and 3A Certified. Manufactured and assembled in the U.S.A.

Selecting the Right PD Pump for Food & Beverage Processing

Selecting the Right PD Pump for Food & Beverage Processing

Understand the principles of different rotary pumps before making a choice.

It is no secret that the food and beverage industry is ever-changing. According to the United States Department of Agriculture Economic Research Service, “New U.S. food and beverage product introductions in retail outlets, as tracked by Mintel’s Global New Product Database (Mintel GNPD), have followed an upward trend since the late 1990s, exceeding those of nonfood grocery items since 2010.

In 2016, food categories with the largest shares of overall new product introductions included beverages, snacks, bakery items, sauces, dressings and condiments.”

In the current food and beverage manufacturing landscape, choosing the right sanitary positive displacement (PD) pump is critical to supporting operational efficiency and product consistency while minimizing waste and downtime. There are a variety of PD pump technologies available to food processors today. Collectively, they can meet a wide range of performance capacities, pressures and viscosities. But not all PD pumps are created equal. And not every pump can tackle every application.

PD pumps move a product by repeatedly enclosing a fixed volume of the product and displacing it with each actuation, which can be broken down into two classifications: reciprocating and rotary. This article focuses primarily on rotary pumps, specifically: lobe pumps, circumferential piston pumps and twin screw pumps.

The operating principle of these rotary PD pumps consists of two counter-rotating rotors located within the pump housing. As the rotors rotate within the pump housing, they move product through the pump by opening and closing volumes controlled by the spacing between the rotors.

On the suction side, an expanding cavity is formed between the rotor and pump housing. This creates a partial vacuum and allows product from the supply piping to fill the void. This volume then closes to both the inlet and outlet piping to transport a fixed volume of product to the opposite side of the pump where it is discharged when the rotors converge.

A Closer Look at Common Rotary PD Pumps 

Rotary lobe and circumferential piston pumps are the two most-often used technologies for sanitary PD applications. Visually, they are similar, and depending on the manufacturer, these two pumps can even be made using common components, such as shafts and housings.

Both styles have two rotors that draw in product and transport it from suction to discharge. The tips or wings of the rotors create a near-contact sealing action within the pump housing. The space between the tips or wings denotes the volume of product being displaced.

What sets a rotary lobe pump apart from a circumferential piston pump is in the design of the rotors and the housing.

Lobe pump 

Lobe pump rotors are in constant closeness with one another but never drive each other like a gear pump. The constant near-contact of the rotors creates a seal to transport product from the suction to the discharge side of the pump.

Overall, rotary lobe pumps are ideal for high viscous product and are the most affordable of the three types.

Circumferential piston pump 

Circumferential piston pump rotors create the seal between stators that extend from the pump housing. The rotors also do not touch nor mesh. The sealing action only exists between the stators and rotors. Due to the additional geometric features, these pumps tend to be more expensive than lobe pumps. However, these features make circumferential piston pumps superior at low viscosity efficiency compared to lobe and twin screw pumps.

Twin screw pumps 

Twin screw pumps are starting to become more common among PD pumps in food and beverage applications. The two-spindle design displaces product in an axial direction. This pump type has low pulsation, which reduces pump wear and aides in the gentle handling of product.

Low pulsation also helps the twin screw pump operate at higher revolutions per minute (rpm). This gives it the advantage of being able to also function as a (clean-in-place) CIP supply pump, thereby simplifying piping and controls.

Twin screw pumps are the most expensive option of these three PD pump types.


Read full article at Pumps & Systems written by Richard Shook

Selecting the Right PD Pump for Food & Beverage Processing

ampco pd pumpsRichard Shook is a senior mechanical engineer for Ampco Pumps Company in Glendale, Wisconsin. He received his Bachelor of Science of mechanical engineering from Marquette University. Shook has also earned ISO 9001 internal auditor certification, has extensive knowledge of quality control and management, and serves as a member of the steering committee for 3A Sanitary Standards, Inc. For more information, visit

Dairy Processing Products by Ampco Pumps Company

Dairy Processing Products by Ampco Pumps Company

Ampco Pumps Company takes sanitary applications very seriously, especially when it comes to dairy. This gives customers added peace of mind when purchasing their sanitary pumps, mixers and blenders.

Ampco is committed to offering a wide range of economically priced products to heed the call for sanitary dairy processing applications.

From centrifugal pumps and positive displacement pumps to Ampco’s customized solutions for mixing and blending, you’ll find a portfolio of versatile and durable products that can be delivered quickly.

Take a closer look at their best-selling dairy processing products.
OEM Quality Spare Parts for Fristam, Waukesha and Ampco Style Pumps

OEM Quality Spare Parts for Fristam, Waukesha and Ampco Style Pumps

As an industry leader in pump delivery lead-times, Ampco maintains one of the largest parts inventories in the industry – and most are 100% interchangeable with competitor pumps.

OEM Quality, Cost Effective Price

Most of Ampco’s parts are ready for immediate shipment, from seal kits and cover gaskets to stub shafts and alloy 88 rotors, Ampco has you covered.

If you have a serial number, use the Request a BOM button on the following page and Ampco will send you the original product build sheet for your pump with all of the part numbers you need: