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Designs for controlling hot processes – it’s all material

Published: 15 October 2015 - Lisa Peake

Angled seat process control valves form an integral part of process engineering in a huge number of applications and getting the right specification can boost reliability and productivity. One of the most important factors is temperature, both of the process media under control and the ambient temperature.

Ian Webster, Hygienic Segment Manager for UK & Ireland at Bürkert Fluid Control Systems, looks at the impact that temperature has on valve design and how to achieve the most cost effective solution.

Process engineers are required to deliver a difficult balancing act that requires a robust and reliable process to be maintained while keeping costs to a minimum. Sometimes a short term view may identify some cost savings when replacing components with lower cost items within in the process control system. However, looking at the operation from the point of view of total cost of ownership (TCO) this may reveal a false economy in the long run.
 
One example of this would be process control valves, many of which may be very similar in outward appearance, but taking a closer look can reveal some significant design characteristics that can affect performance and reliability. The materials that are used to create the various components of the valve dictate the range of suitable applications in which it may be used. Manufacturers should provide details of these materials and their proper
ties to simplify the selection process.
 
Since the properties of the media that is being manipulated by the process control system are known, it is the responsibility of the process engineer to select the most appropriate design, based on this knowledge. Two of the most pertinent factors are temperature and chemical composition as these have a significant influence on the materials that can be included in the design of the control valve.
 
Control valves that are destined for operation with aggressive fluids or extremes of temperature must be equipped with the correct seal materials and constructed from high quality materials in order to deliver reliability and efficiency. Production downtime caused by a faulty control valve can result in substantial costs, so quality valves can offer protection for the workforce and the bottom line.
 
In designing the latest version of its enduring Type 2000 angle seat valve, Bürkert has invested in the technology and the equipment required to produce a cost effective solution by offering a wide range of high quality, fully tested valve body and valve seat materials. In order to provide its customers with the highest quality guarantee, the company has invested in considerable production assets in Europe where quality control and design integrity are held paramount.
 
The designers specified valve spindle seals manufactured from PTFE as standard but these can also be delivered with FKM or PEEK seals and wipers. The seal on the actual valve seat is usually made from PTFE but other options include NBR, EPDM and FKM, all of which offer additional benefits for certain applications; making the correct choice will have a dramatic effect on the reliability and performance of the control valve.
 
Specialist engineers at Bürkert are able to offer detailed advice on the most suitable options, based on the particular application. They can also offer advice on existing control valve suitability to a new process or a change in manufacturing design. With experts in a whole range of applications from food to petrochemical and pharmaceutical, Bürkert has delivered comprehensive solutions to process control challenges across many industries.
 
The latest Type 2000, pneumatically actuated, angle seat valve retains the excellent performance and reliability characteristics of the previous model while benefitting from an improved space saving valve body design. In addition, the valve can now be complimented with a range of control heads, feedback units and stroke limiters, to improve integration with the wider process control system.
 
With such a successful history as the Type 2000, it is important that any customer who is looking to replace an existing component will experience the same or higher levels of reliability and accuracy with their new, replacement valve. Selecting the most suitable combination of materials for a particular application can often result from taking expert advice 
at the outset where confidence in the solution also comes from a belief in the manufacturer’s ability to deliver high quality products.
 
Product traceability and quality control are the cornerstones of Bürkert’s manufacturing process, all of which is retained within Europe and kept under careful scrutiny. In this way customers are assured of the reliability of every product and that the stated performance specifications will match the actual characteristics of the product.
 
Material properties

Abb

Name

Temperature Range (°C)

EP

Epoxy Resin

20 – 150

PA

Polyamide

0 – 100

EPDM

Ethylene Propylene Diene Rubber

30 – 130

FKM

Flourine Rubber

0 – 150

NBR

Nitrile Rubber

10 – 90

PTFE

Poly Tetrafluorethylene

20 – 200

PEEK

Poly Ether Ether Ketone

up to 22

For more information on control valve design, permissible temperatures or additional design information, visit the Bürkert website or phone +44 (0) 1285 648720.

Source: Irish Manufacturing
Industry Connections: Burkert Fluid Control Systems


 
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