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Troubleshooting temperature control valves

Correctly installed your Amot valve should give you years and years of trouble free service. 

However, if you experience prolems after installing the valve, or if unexpected valve behaviour occur during operation, consider the check points below before other action is taken. 


System Temperature Too High

  • Cooling capacity of system inadequate

  • Thermostatic valve too small for flow rate causing high pressure drops and possible cavitation problems

  • Valve installed backwards, reducing flow to cooler as temperature increases

  • By-pass will not close due to worn or pitted seats, sliding valve, seals, etc.

  • Elements may have suffered sufficient over-temperature to prevent full movement, thus preventing full cooling

  • Solids building up on element sliding valve preventing correct operation

  • Foreign matter stuck between sliding valve and seat

System Temperature Too Low

  • Insufficient heat transferred to coolant to maintain temperature

  • Wrong nominal element temperature selected

  • Thermostatic valve greatly oversized or cooling capacity of system much greater than required

  • Thermostatic valve installed backwards, thus sending water to cooler at low temperatures

  • Worn or leaking O-rings allowing leakage to cooler

  • Excessive pressure drops across the valve 

  • Foreign matter preventing closure of elements

  • Bi-metallic type thermometers will indicate low if calibrated in oil

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