Can more knowledgable persons please explain because I am not very familiar with details of valves and its dimensions.For pneumatic actuated valves, would the face to face dimension be the same as a manual valve for a given type of valve, e.g. butterfly type?I need the information very urgently because for the piping design but unfortunately, the valves have yet to be ordered, but the piping isometrics need to be done.if you are asking for butterfly valve the face to face to dimension can be as per API 609 catB/ASME 16.10( long pattern) or API 609 catB/ISO 5752( Short pattern), The face to face dimension for other valves will be as per ASME 16.10. i think i have cleared for your query.Differentiate throttling valves from shutdown valves. Normally the valve shutdown valves use the same line class valves as manual valves. Thus the face-to-face should be per the ASME standards. Throttling valves per ISA standards may not match the ASME standards. Some of these issues depend upon the valve purchase specifications.Regardless, the actuator for a shutdown valve (scotch yoke style) could be substantially larger than the face-to-face. Assure that the piping layout accommodates the actuator including access to any valve mounted control accessories.

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