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Yoshitake Products Q&A: Temperature Regulators, Vacuum Relief Valves, Noiseless Heaters

Q Is there a limit in installation direction of the bulb of the temperature regulator?
   

A

There are two types of temperature regulator.
OB-30 and OB-2000 are actuated by the expanding pressure of gas, and OB-1 to 6 series are operated by expanding pressure at vaporization of liquid.
OB-30 and OB-2000 can be installed horizontally or vertically as you desire, however, the bulb should be in contact with the heated fluid by the area of at least 3/4 of its body.
OB-1 to 6 series have limits in Installation conditions. Install the bulb in such directions that the connection part should be horizontal or upward against the opposite end, and that T mark on flange or connecting nut comes upper side. (Please refer to the brochure or instruction manual.)
   
  
Q How do I select a proper temperature regulator?
   
A In order to select the proper nominal size of the regulator, the differential pressure before and after the valve should be 0.05MPa or less. When the inlet pressure is set in the range of 0.2 to 0.3MPa, the best performance and durability are expected.
   
Q What kind of attention should be paid when the temperature regulator valve is installed in a place where the atmosphere temperature can be high with direct sunlight or in closed room?
   
A The valve cannot regulate the temperature appropriately when the atmosphere temperature exceeds the set temperature. Please refer to the tolerance of "atmosphere temperature" in the brochure.
   
 Q How long does it take the valve disc to open or close? (In the case of the temperature regulator OB-30)
   
 A It depends on the temperature range of the sensor.
Example:
1) Set temperature range 25 - 70 degrees C
From 25 to 70 degrees C (open): 90 sec.
From 70 to 25 degrees C (close): 60 sec.
2) Set temperature range 70 - 150 degrees C
From 25 to 70 degrees C (open): 60 sec.
From 70 to 25 degrees C (close): 60 sec.
In each case, the valve closes within 2 minutes.
   
Q What is the maximum warning sound temperature limit?
 A The maximum warning sound temperature limit means the maximum limit temperature at which the noiseless heater (equipment that lowers the vibration or noise generated when water is heated by steam blowing in) works well without making an unusual noise, while steam-heating is activated.
Strong vibration or loud noise occurs if the system is operated at a temperature over the maximum warning sound temperature limit.



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