Providing outstanding safety equipment, consultancy and expertise for your company.
Because safety is a necessity, not a commodity

Tel: 01332 673700 Mobile: 07968 512311 Email:


Hazardous Chemical Sampling Systems

We are proud to be the exclusive UK agent for Dopak sampling systems, the expert suppliers of hazardous chemical sampling systems. Dopak sampling systems for hazardous chemicals improve safety and reduce spills because they use the patented Dopak needle assembly – feel free to contact us and we’ll tell you the nitty gritty about it.

Sampling systems from Dopak for hazardous chemicals are installed worldwide in all sectors of the process industry and these can be installed to a pipeline or to a tank. With a Dopak sampling system you can take a hazardous sample safely and cleanly with no spills using our septum sealed sample bottles.

There are many types of Dopak Sampling Systems available. All systems can be tailored to your company’s needs, so contact us at Derwent James Ltd and use our experience and expertise to help you quickly select the correct sampling system or visit the Dopak website to download datasheets, brochures and to see videos of all Dopak systems.

Lockout Tagout Equipment

Why does your company need outstanding lockout tagout equipment? Well, to safely isolate the machinery at your workplace you will require this equipment. We have an extensive range available, so we’ve got the solution, design and process that’s right for your company – and if not, we will be happy to point you in the right direction for further help and support.

Most of the superb products we provide (along with our support) are available on short delivery times, and many can often be shipped next day – and additionally all our products are competitively priced so you’re sure to get a competitive quotation!

And don’t forget, as well as lockout tagout equipment that is right for your company, we offer the consultancy and technical support you need, too. Because you’re never on your own when it comes to company safety with Derwent James Ltd.

Machine guarding and Valve Interlocks

An interlock is a relatively simple solution that can vastly improve the safety on critical installations and our mechanical valve interlocks safely lock all sizes and types of installed valves.  Our standard interlocks are available to fit your existing valves and are used for many applications. Some additional examples include; locking enclosures, control panels, and even machinery access gates.

Using our interlocks improves safety across your site and in addition will also ensure critical valves are not operated incorrectly or by unauthorised staff. It will also ensure valves and other critical equipment are only operated when they should be. So, please call us today for further information.

We’d love for you to contact us to discuss your mechanical valve interlock and on-site safety solution needs.

High Pressure Valves

We are proud to provide pressure regulating valves, control valves and pressure relief valves designed and manufactured in the UK by Presreg Valves, and these are suitable for gas or liquid applications up to a huge 690 bar pressure. These provide accurate control for your gas or liquid application, whether it requires upstream or downstream control.

Manufacture of all critical components, final assembly and testing of each individual valve is carried out at the JRE Precision in-house factory in Loughborough. Our pressure regulating valves experts are able to readily provide individual solutions for both your special applications and a fast turnaround of standard valves.

We offer a comprehensive choice of performance, configuration and material options that will satisfy the most demanding and arduous applications, all backed up by over twenty years of experience in this sector.

Our high pressure valve range includes: High pressure upstream regulators; High pressure downstream regulators; High flow regulators; Electronic signal controlled pressure regulators; Pneumatic dome loading regulators; Pressure relief valves; High pressure zero leakage isolation valves; Pilot operated isolation and ESD valves; System protection and fail safe valves; Automatic change over valves; Pipeline filtration; Bespoke valves and system design and manufacture.

Chemical Resistant Hoses

Ask yourself this: If you are transferring or moving chemicals, are you using the correct equipment?

We provide chemical hoses by Elaflex, which are made in their factory in Germany and are lightweight, flexible, reliable and have a long service life. These can be used with a wide variety of different hose couplings or fittings to give you a complete hose assembly for quick installation in your factory.

Elaflex chemical resistant hoses can be used up to 16 bar pressure and comply with the EN standard 12115.  Our chemical hoses are suitable for the majority of chemical transfer applications where safety and chemical resistance are important.

Using our chemical resistant hoses with our hose couplings or dry disconnect couplings gives a safe, clean and spill free solution to hazardous chemical transfers. Our dry disconnect couplings are easy to handle so will save you time, are safe, and they are also environmentally friendly.  But above all – they are superbly reliable.

Rubber Expansion Joints

Rubber expansion joints: the flexible connection for your pipe system installation. Why not reduce vibration and noise using our Elaflex expansion joints? Indeed, a huge range of Elaflex rubber expansion joints are available via Derwent James Ltd.

At Derwent James Ltd, we will work with you to design an expansion joint for your own installation. It’s a simple and quick way to design and purchase the correct rubber expansion joints for your pipe installation.

Let Derwent James Ltd provide outstanding safety equipment, consultancy and expertise for your company. Please get in touch with us at:

Tel: 01332 673700 - Mobile: 07968 512311 - Email:

Providing outstanding safety equipment, consultancy and expertise for your company.
Because safety is a necessity, not a commodity

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