New Control Valve for Corrosive or Abrasive Applications

Heap and Partners Limited was approached to develop a solution to a range of problematic corrosive and abrasive applications.

The solution Heap's developed was a combined Saunders Fisher valve specially developed to combat the issues of inadequate control often experienced when using different types of valves, actuators & positioners.

Utilising the diaphragm valve from the market leading Crane Saunders Diaphragm valve and actuator from the market leading Emerson Fisher control valve, it is designed for applications involving corrosive & abrasive processes where the use of conventional valves may not provide the best solution, the key benefits being:

Low maintenance diaphragm construction
• No stem packing, minimising potential leak path
• Wide range of valve body and lining materials
• Suitable for abrasive & corrosive media
• Wide range of sizes
• High flow capacity
• Accurate control due to pneumatic diaphragm actuator design
• High accuracy digital valve positioner
• Contactless positioner unit
• Wide range of ancillaries available
• Low cost relative to other control valve types

Case study 1 - Initial application for the replacement of old lined control valves in sizes 1” through 3”, which were no longer available from the original equipment manufacturer, the application involved the level control of an acid dosing system.

Heap and Partners provided an alternative solution utilising a Saunders A-Type diaphragm valve with ETFE lined body and Emerson Fisher’s Pneumatic diaphragm control actuator type 657/667. This was driven via Emerson’s digital valve positioner type DVC6200 with linkage less feedback capability, a special valve actuator adaptor kit was designed through Heaps’ in house engineering capabilities.

Case study 2 - An application was presented to Heaps for control of dilute aqueous acid. Heap & Partners put forward a 2” ebonite lined Saunders A-Type diaphragm valve as a solution to the application with a Fisher 657 pneumatic actuator mounted via a special adaption piece, a Fisher DVC6200 digital valve positioner with performance diagnostic was utilised.

Case study 3 - After being approached by one customer to provide a solution for a difficult application that required accurate control of CO2 & nitrogen with trace ammoniated liquors (the customer had tried a number of different valves in the application without success). Heap & Partners proposed the use of a Saunders A-Type diaphragm valve with a Fisher GX pneumatic diaphragm actuator and Fisher’s integrally mounted DVC2000 digital positioner unit. The improvement in the process was almost immediate, this unit was initially supplied on a trial basis with a view to installing further units on similar applications around the site.

The beauty of the solution developed by Heap & Partners is that it combines two market leading products whilst retaining the very best advantages of both products. The Saunders diaphragm valve's ability to easily handle solids and aggressive duties together with the Fisher actuator's excellent control capabilities.

For further information please contact Ian Edwards, Business Development Manager - Fisher Valves & Regulators at Heap and Partners.

Heap and Partners Ltd.
Tel: 0151 488 7222
Web: www.heaps.co.uk


Published: 25th February 2015

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