Derwent James Ltd | Diaphragm Seals | Pressure Regulating Valves | Sampling Systems

We provide process instrumentation and safety solutions to the engineering market. We represent a range of leading brands and experts producing a variety of systems and components.

Our diaphragm seals in either threaded or flanged types are manufactured in steel or a choice of exotic materials. Diaphragm seals can be mounted to transmitters and pressure gauges.

We supply pressure regulating valves from Presreg. They are masters at designing and manufacturing quality regulating and control valves up to 1050 bar pressure. Our extensive range of pressure regulating valves allows customers to choose a valve based upon performance elements, configuration requirements and material options.

The valves have been manufactured to meet the needs of demanding applications and can withstand arduous use. They are individually tested and certified.

We can offer Dopak sampling systems for projects requiring manual samples of dangerous gas or liquids, with zero emissions, to be taken by the operator.

Dopak sampling systems have been designed to allow users to undertake the safe sampling of liquids. The samples can be efficiently transferred into bottles and liquefied gas can be safely deposited into cylinders.

We have a wide selection of pressure gauge equipment available from a range of brands. Our types of pressure gauge items include process pressure gauges, safety pattern pressure gauges and differential pressure gauges.

Our range also consists of a number of accessories including over pressure protectors, siphons, and swivel gauge adaptors.

Our range of measure pressure equipment includes the series of Badotherm Instrumentation products.

In order to measure pressure, you can choose from high quality pressure gauges, low pressure capsule gauges and differential gauges. Badotherm Instrumentation also provides thermometers including both bi-metals and gas-filled types.  

Gas sample equipment and systems from Dopak can be provided in order to take safe, emission-free samples of gases and liquefied gases.

Gas sample equipment means you can take a gas sample into a cylinder. Dopak's range of sampling systems can be supplied specifically to suit your process conditions.

Our selection of chemical hoses consists of a range of smooth bore, lightweight hoses for chemical transfer.  We supply chemical hoses from Mann Tek and supply our customers with a choice of tank couplings and rubber expansion joints.

Our hoses and accessories also include Permex stainless steel hose reels, Rassm and Graco pumps, and Flammer flame arrestors. 

We provide expansion joints manufactured from rubber for a range of applications. The majority of our expansion joints are supplied from Elaflex.

We are dedicated to ensuring our customers are provided with equipment, components and systems that are exceptional and that have internationally recognised high standards. This ensures all our equipment is suitable and accurate for the job it is intended for.   

Our lockout tagout range from Total Lockout is a new portable valve actuator offering a variety of solutions with many essential features. The lockout tagout includes safety padlocks, multi lock hasps and electrical lockout.

They provide lockout storage solutions and consist of cable lockouts, valve locks, tags and signs and a complete range of safety and lockout accessories.

Our wide selection of valve lock items includes valve handwheel covers, valve lever lockouts, and universal valve lockouts. Our valve lock equipment also consists of a choice of cable devices.