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Pressure Control

Control Valves. Liquid Level Control. Pressure Control. Temperature Control. Glycol Pump. Temperature Controllers. Indirect Thermostat. Negative feedback for linear output. 5 to 30 psi air or gas supply pressure. Stainless steel housing. Bi-metal sensing element

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Pressure Control

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  1. Control Valves Liquid Level Control Pressure Control Temperature Control Glycol Pump

  2. Temperature Controllers

  3. Indirect Thermostat Negative feedback for linear output 5 to 30 psi air or gas supply pressure Stainless steel housing Bi-metal sensing element for accurate control Single adjustment over Wide temperature range: T 12 -30 to 400oF HT 12 -30 to 700oF Output pressure proportionate to temperature at any setting T12

  4. ? Direct or Indirect ? Direct Mode Indirect Mode Rising Temperature Rising Temperature Rising Output Falling Output Direct Indirect

  5. Indirect Thermostat Indirect

  6. Thermostat with Separable Socket Maximum Working Pressure Without Separable Socket 500 psi With Separable Socket 4000 psi With Special Separable Socket 7000 psi

  7. Direct Acting Thermostat Supply Output T 12DA Direct

  8. T 12DA Thermostat Reversed for Indirect Throttle Mode Supply Output Indirect

  9. High Temperature Thermostat Supply HT 12 Output Indirect

  10. Direct Snap Thermostat T 12S Output Supply Direct

  11. Indirect Snap Thermostat T 12DAS Output Supply Indirect

  12. Indirect Throttle Thermostat T 12T Output Supply Indirect

  13. Direct Throttle Thermostat Output T 12TDA Supply Direct

  14. Direct Semi-Throttle Thermostat T 12DAT Output Supply Direct

  15. Indirect High Temperature Shut-Down T 12M Output Supply Indirect

  16. Direct Low Temperature Shut-Down T 12DAM Output Supply Direct

  17. High Temperature Pilot Guard Supply HT 12PG Output Direct

  18. Typical Installation High temperature shutdown thermostat Burner control thermostat Burner valve Main burner Safety shutdown valve Pilot Pilot Guard thermostat Instrument Gas

  19. Typical Burner Control Installation Low liquid shutdown pilot High temperature shutdown thermostat Burner control thermostat Main burner Pilot Instrument Gas Pilot Guard thermostat Safety shutdown valve Burner valve

  20. Trouble Shooting SYMPTOM CAUSE • Bent sensing element • (element should be centered • in base and should “ring”) • Incomplete immersion of probe • Dirty pilot plug seat • Hole in diaphragm • Weak pilot plug spring • Faulty ‘O’ ring • Erratic temperature changes • Continuous venting

  21. Trouble Shooting • To check small seat: increase temperature setting • several degrees and see if venting stops. • To check large seat: decrease temperature setting • several degrees and see if venting stops. • Replace pilot plug and seats if unable to stop venting • by cleaning seats.

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