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JBK
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Join Date: Jun 2011
Posts: 32

Comparison Between On/Off Valve and Control Valve

04/08/2013 8:45 AM

From the view of maintenance cost, which valve among On/Off Valve and Control Valve is expected higher maintenance cost? Also I would to ask the brief explanation to support your opinion.
Sorry for vague question.
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Pathfinder Tags: control valve on/off maintenance cost
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Comparison between On/Off Valve and Control Valve

04/08/2013 9:05 AM

The question is meaningless, as the valves do different jobs. It's not a case of swapping one type for another on the basis of maintenance cost.

Also, there is no indication to the forum as to any of the following upon which to base any response:

  • Number of valves
  • Size of each valve
  • Location of each valve
  • Access to each valve
  • Duty of each valve
  • Medium flowing through each valve, its aggressiveness, temperature and pressure
  • Materials of construction of each valve
  • Replacement value of each valve
  • Replacement value of consumables kits for each valve
  • Type of motor on each valve, if any
  • Number of operations per unit time of each valve
  • The frequency and duration of valve breakdowns
  • The frequency and duration of valve preventative maintenance
  • The value of local labour
  • Valve repair shop overhead time value
  • The cost of process equipment down-time
  • Local currency and its swings relative to other currencies
  • Etc., etc.

so in the circumstances, the best place to look for the information is to do an analysis of the repair and maintenance accounts for the valves in question at the facility in question. There is no way such commercially sensitive information would appear in a global Engineering forum such as CR4!

Only one thing is for sure: the costs of not maintaining the valves will far exceed the costs of doing so.

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NotUrOrdinaryJoe
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Popular Science - Cosmology - New Member Technical Fields - Technical Writing - New Member Engineering Fields - Energy Engineering - New Member Engineering Fields - Electrical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Electromechanical Engineering - Old Member, New Association

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Location: Lexington, KY
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Good Answers: 73
#2

Re: Comparison Between On/Off Valve and Control Valve

04/10/2013 12:54 PM

While PW makes several good points, perhaps one or two important considerations were overlooked.

If the question is being asked by management or the guy in charge of safety, then the On/Off Valve is the most expensive to replace because it is nearest to the source of material that flows through it. Control Valves would then come after the On/Off valve which would prevent spillage of said material when it was necessary to change the control valve.

Replacing the On/Off valve would require removing the material from its storage tank, etc. in order to prevent loss of the contents of the tank.

Of course, words can be ambiguous when taken in other contexts. So, in this case, it really requires more details before an intelligent answer can be given.

I've got to get one of those signs that says:

Answers ---------------$3

Good Answers ---------$6

Brilliant Answers -------$10

Correct Answers --------$100

Dumb looks are still free.

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