Hotspot: Combined Valve and Actuator TEG Covering Quarter Turn Actuator Sizing and Mounting Kit Requirements

What is it?

There are currently two new ISO standards in development that are relevant to both valve and actuator members who supply quarter turn actuated valves. These standards affect valve and actuator manufacturers and automation package suppliers, therefore it has been proposed that the BVAA establish a new Technical Expert Group (TEG) to allow an effective joint contribution to the development of these standards.

The two standards concerned are as follows:


  1. ISO/NP 5115 Industrial valves Partturn valve actuation


  1. ISO/NP 5640 “Mounting kits for part-turn valve actuator attachment


The attached BVAA Hot Spots previously issued earlier in the year, when these standards were proposed as new work items, give more details on the scope of each standard. BVAA members are present on each of the Working Groups that have been formed, and ideally placed to use the output of the TEG to influence the development of the standards.

It is anticipated that the first TEG meeting will take place shortly after the latest ISO TC153 working group meetings scheduled for this week. If you are interested in participating in this TEG then please inform the BVAA secretariat by 6/11/20.


Why is it Important?


ISO/NP 5115 is proposed to include basic torque requirements necessary to size an actuator including appropriate, application specific, correction factors. It is important that the standard enables the correct application to be correctly identified at the enquiry stage and that the applied correction factors result in the specification of an appropriate actuator size, without the risk of costly and potentially dangerous oversizing.


ISO/NP 5640 covers mounting kits for part turn valves and is proposed to be based on the existing EN 15081 standard which is now 13 years old. The development of this standard provides the opportunity to create an updated version of EN 15081 that will be adopted as an ISO standard. The creation of a single, globally recognised standard has the potential to simplify the specification of mounting kits and reduce the cost of manufacture by limiting the diversity.

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