AutoQuiz: What is the Process of Grinding the Plug and Seat of a Valve Called?

AutoQuiz is edited by Joel Don, ISA’s social media community manager.

Today’s automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified CAutoQuiz20150612ontrol System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. For information about the CCST program, CLICK THIS LINK.

Control Valve Course Update: There are three spots left for ISA’s new valve course set for later this month.  Register quickly if you plan to attend. Don’t forget to use coupon code JUNTS18 when you register for the course to get the class at 50% discount. Register at this page: http://bit.ly/1ElxhX0

The process of grinding the plug and seat of a valve is called:

A) Characterizing
B) Linearizing
C) Lapping
D) Calibrating
E) None of the above

 

Click Here to Reveal the Answer

Although all these terms describe a process that a valve manufacturer might engage in during or after valve construction, the term lapping is a machinist’s term and means to shape or fit by working two surfaces together with (or without) abrasives until a very close fit is produced. The close fit, in this case, is between the plug and the seat and would ensure that there’s no fluid leakage. The correct answer is C.

Control Valve Course Update: There are three spots left for ISA’s new valve course set for later this month.  Register quickly if you plan to attend. Don’t forget to use coupon code JUNTS18 when you register for the course to get the class at 50% discount. Register at this page: http://bit.ly/1ElxhX0

 

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