The FDL series is one of Slack and Parr’s most established product families. These units are designed for accurate flow division across multiple hydraulic circuits and are built to deliver stable, repeatable performance. Features include: High‑precision gear elements Robust construction for long service life Reliable synchronisation across multiple outlets FDL flow dividers are used in hydraulic systems that require dependable flow distribution and consistent circuit control.

The FDR series provides accurate flow division with improved efficiency and smooth operation. These units are designed for applications where stable performance and precise metering are essential. Features include: Enhanced internal geometry for improved accuracy Smooth running and consistent output Suitable for a wide range of hydraulic applications FDR flow dividers are widely used in machinery requiring reliable multi‑circuit control and synchronised movement.

What does Slack and Parr manufacture?

Slack and Parr specialises in precision gear‑type flow dividers and metering technologies used in hydraulic systems that require accurate flow distribution and synchronised movement. Explore Slack and Parr products.

Where is Slack and Parr based?

Slack and Parr designs and manufactures all products at its headquarters in Kegworth, United Kingdom.

Which Slack and Parr flow divider ranges are available?

Hydraulics Online supplies the FDL series, the FDR series and the stainless steel FDR series.

Does Slack and Parr produce stainless steel flow dividers?

Yes. Stainless steel versions of the FDR series are available for environments where corrosion resistance or hygiene is essential.

What are Slack and Parr flow dividers used for?

Slack and Parr flow dividers are used in hydraulic systems that require accurate flow division, synchronised movement and reliable multi‑circuit control.

Can Slack and Parr components be cross‑referenced?

Yes. Hydraulics Online can cross‑reference Slack and Parr flow dividers to current equivalents or suitable alternatives.

Can Hydraulics Online identify a Slack and Parr component?

Yes. We can identify any Slack and Parr flow divider from a part number, label, photograph or application details.

Do you supply Slack and Parr products internationally?

Yes. Hydraulics Online supplies Slack and Parr flow dividers worldwide with full export documentation and technical support.

What if my Slack and Parr component is discontinued?

We can help identify suitable replacements or alternatives when original units are no longer available.

Slack and Parr Hydraulics

Hydraulics Online Component Expertise: Slack & Parr hydraulic flow dividers for mobile and industrial applications worldwide

Slack and Parr is a long‑established British engineering manufacturer recognised globally for producing high‑precision hydraulic flow dividers and metering technologies.

Founded in 1958, the company has built its reputation on exceptional accuracy, robust construction and meticulous craftsmanship. These qualities have made Slack and Parr a trusted supplier across demanding hydraulic applications for nearly seven decades.

From its headquarters in Kegworth, Slack and Parr combines traditional engineering expertise with modern manufacturing capability. The company specialises in producing gear‑type flow dividers and metering pumps designed to deliver highly accurate and repeatable performance even under challenging operating conditions. Their components are used wherever synchronised movement, controlled flow distribution or precise metering is essential.

Slack and Parr’s long history of innovation is supported by continuous investment in advanced machining technology, quality assurance systems and specialist engineering talent. This commitment ensures that every flow divider leaving the factory meets strict performance standards and delivers long service life in real‑world hydraulic systems.

Today, Slack and Parr is recognised as one of the world’s leading manufacturers of precision flow dividers, supplying OEMs, hydraulic system builders and end users across multiple sectors. Their products are valued for reliability, accuracy and durability. These characteristics have become synonymous with the Slack and Parr name.

Slack and Parr Product Series Overview

Slack and Parr is best known for its precision gear‑type flow divider technology, used in hydraulic systems that require accurate flow distribution, synchronised movement and dependable metering performance. The company has specialised in this field for more than sixty years, and its product families remain widely used across mobile and industrial hydraulic applications.

Below is an overview of the Slack and Parr flow divider ranges supplied by Hydraulics Online.

The FDL series is one of Slack and Parr’s most established product families. These units are designed for accurate flow division across multiple hydraulic circuits and are built to deliver stable, repeatable performance.

Features include:

High‑precision gear elements
Robust construction for long service life
Reliable synchronisation across multiple outlets

FDL flow dividers are used in hydraulic systems that require dependable flow distribution and consistent circuit control.

The FDR series provides accurate flow division with improved efficiency and smooth operation. These units are designed for applications where stable performance and precise metering are essential.

Features include:

Enhanced internal geometry for improved accuracy
Smooth running and consistent output
Suitable for a wide range of hydraulic applications

FDR flow dividers are widely used in machinery requiring reliable multi‑circuit control and synchronised movement.

Slack and Parr also manufactures stainless steel versions of the FDR series for environments where corrosion resistance and hygiene are critical. These units offer the same metering accuracy as standard FDR models, with added protection for demanding operating conditions.

Features include:

Stainless steel construction for corrosion resistance
Accurate and repeatable flow division
Suitable for harsh or hygiene‑sensitive environments

These flow dividers are used in applications where durability, cleanliness and long service life are essential.

Slack and Parr Product Catalogue

Slack & Parr FDL Flow Dividers

Slack and Parr FDL series rotary gear flow dividers are available with 2 to 6 elements/outlets and from 12 cc/rev…

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Slack & Parr FDR Flow Dividers

Slack and Parr FDR series rotary gear flow dividers are available with 2 to 6 elements/outlets with element capacities from…

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Slack and Parr FDR Stainless Steel Flow Divider

Slack & Parr FDR Stainless Steel Flow Dividers

Slack and Parr FDR stainless series rotary gear flow dividers are used in aggressive or corrosive environments and are usually…

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VIEW ALL SLACK AND PARR PRODUCTS

Hydraulics Online and Slack and Parr

Hydraulics Online supplies the full range of Slack and Parr hydraulic flow dividers, including FDL flow dividers, FDR flow dividers and stainless steel FDR flow dividers. As an independent hydraulic supplier, we provide unbiased technical support and help customers identify the correct Slack and Parr component or a suitable alternative.

We can assist with:

Identifying Slack and Parr flow dividers from part numbers, labels or photographs
Supporting hydraulic applications that require accurate flow division and synchronised movement
Cross‑referencing Slack and Parr components for replacements or upgrades
Supporting legacy Slack and Parr equipment where original documentation may be limited
Advising on alternatives when original parts are no longer available

Hydraulics Online supplies Slack and Parr products worldwide. We provide full export documentation and technical support and are the only official Export Champion in the UK hydraulics industry. We have supplied customers in more than 130 countries since 2004.

You do not need to know the exact part number or specification. Share whatever information you have and we will take it from there.

Need technical guidance or can’t find the hydraulic equipment you’re looking for? Get in touch – our team will support you.

Slack and Parr News and Insights

How to select the right hydraulic flow divider

Geared hydraulic flow dividers contain moving, rotating parts – keeping the speed within a good working range is important for optimum performance.

The rotation speed depends on the capacity per revolution of the specific design, and the oil flow rate for each element in that design. While a hydraulic flow divider will generally work between 750 rpm to 3000 rpm, its optimum speed range is between 1000 rpm and 2000 rpm.

Flow divider elements each handle one division of the flow with the combination of elements being selected to achieve the desired oil flow within the speed range above.

This guide on selecting a hydraulic flow divider has been produced in conjunction with Slack and Parr. Their flow dividers are available with elements in several different sizes and in two distinct and discrete ranges:

FDR range: 2 | 4 | 6 | 9 cc/rev capacity
FDL range: 12 | 18 | 24 | 30 cc/rev capacity

Slack and Parr: Frequently Asked Questions

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Slack and Parr Hydraulics

Slack and Parr is a long‑established British engineering manufacturer recognised globally for producing high‑precision hydraulic flow dividers and metering technologies.

Slack and Parr Product Series Overview

Slack and Parr Product Catalogue

Slack & Parr FDL Flow Dividers

Slack & Parr FDR Flow Dividers

Slack & Parr FDR Stainless Steel Flow Dividers

Hydraulics Online and Slack and Parr

Need technical guidance or can’t find the hydraulic equipment you’re looking for? Get in touch – our team will support you.

Slack and Parr News and Insights

How to select the right hydraulic flow divider

Slack and Parr: Frequently Asked Questions

Stay ahead with expert Hydraulic Insights