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103 series 

Medium flow - high accuracy

Pressure reducing regulator

General info

103 Series - High accuracy regulator

The 103 series utilises a rubber diaphragm, resulting in a very accurate control of outlet pressure.

A balanced main valve ensures a stable outlet pressure, even with a varying inlet pressure.  A rubber main valve seat offers very reliable bubble tight shut off at all operating pressures. 

A wide range of options are available, including materials to suit most medias, porting and gauge port options and a choice of handwheel or grub screw control. As with all of our regulators, bespoke solutions can be offered to suit most applications.  

These advantage make this regulator the perfect choice when a high accuracy and medium flow rate is required. 

Features and benefits

- Rubber main valve seat offers very reliable bubble tight shut off at all operating pressures

- Large diameter diaphragm provides very accurate pressure control over outlet pressure range. 

- The balanced main valve will ensure steady outlet pressure, even with a varying inlet pressure. 

- Modular construction allows easy servicing

- Multiple material and porting options available 

- Spares & service kits available.

Common applications

- Hydraulic and Pneumatic control systems requiring accurate, reliable pressure control. 

- Compressed air supply systems requiring medium flow rate. 

- Often used for instrumentation and sampling systems. 


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Panel mounting details

Maximum panel thickness:  5.0 mm

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103 series - spec tab - panel mount image.JPG


Use the tool below to identify the type of spares kit required, then contact the sales office, quoting the names of the spares kits required and the serial number of the regulator.

The sales office will then provide a spares kit part number and price.


103 – Available spares kits - Hover over a option below to highlight the parts supplied in the kit:

The 103 Series has a modular design, meaning the main valve sub assembly can be replaced without removing the regulator from the line.

ALWAYS refer to operating and maintenance instructions before carrying out any maintenance


Factory servicing is available on request.

Contact sales office with serial number for details and price.


Please contact office if you require any additional information. 

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Soft seals spares kit

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Main valve sub assembly


Click the links below to download documents



Additional document downloads


Click on a link to download a file. 


Please contact office if you require any additional information.  

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103 series - Datasheet

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103 series - General assembly drawing

103 series - Operating & Maintenance instructions

103 series - List of available spares

103 series - 3D STP Model

PRESREG Valves product brochure

- Use tool to generate part number

- Contact sales office with part number for a price

Ordering info

Use the tool below to generate a part number. 

Contact the sales office with part number for prices.

We are happy to offer assistance and advice on generating part numbers and advising the right regulator for the right application.  

Contact the sales office for more information.  Contact Us.

The following features are standard on all models:

-  Maximum inlet pressure:  100 bar

-  Spring loaded

-  Non-venting

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