Riyaz has extensive experience with Digital Valve Controllers with Emerson's Fisher brand of valves. These microprocessor-based DVCs are used for field devices mounted on Final Control Elements for Basic Process Control System and Final Element on Safety Instrumented Systems.

Posts by or with Riyaz Ali

Positioner Pneumatic Pressure Bleed in Throttling Control Valves

Jun 14, 2017

With the emphasis on improving energy efficiency and reducing greenhouse gas emissions, process manufacturers have turned to pneumatic low-bleed and zero-bleed valve positioners. Emerson's Riyaz Ali copied me on an email about a recent article that mentioned a...

5 Questions for Digital Valve Controller and Safety Expert Riyaz Ali

May 3, 2017

Let's continue our 5 Questions for an Emerson Expert podcast series with our guest, Riyaz Ali. You may recall Riyaz from numerous posts about digital valve controllers and final control elements in safety instrumented system applications. He has almost 40 years'...

Safety Valve and Actuator Proof Test Coverage

Nov 9, 2011

I saw an email string with a question asking if it's possible to detect all possible failure modes in a safety valve if very intensive and intrusive tests, such as full-stroke testing, leak testing, etc. are performed. Would it be conceivable to use 100% proof test...