Automatic temperature and humidity regulation – Miscellaneous – Burner controls with automatic cutoff
Patent
1977-06-30
1980-01-15
Braun, Leslie
Automatic temperature and humidity regulation
Miscellaneous
Burner controls with automatic cutoff
165 39, 236100, G05D 2312
Patent
active
041834666
ABSTRACT:
A thermally actuated phase change operated control valve particularly adapted for use with heat pump systems has a valve body having a bore therein defining a fluid flow chamber, said valve body having an inlet port at one end and spaced and sized outlet ports in the medial wall thereof so that a valve head slidably disposed in the fluid flow chamber will in the calibrated position of the valve head maintain a predetermined minimum flow of fluid from said inlet port through the respective outlet ports. A thermally operated phase change assembly is adjustably connected to said valve housing so that the operating member of said phase change assembly extends into said valve housing and is connected to said valve head to modulate the valve head in one direction to vary the opening to one pair of outlet ports until a maximum flow is passed therethrough at one predetermined low temperature and to modulate the valve head in the opposite direction so as to vary the opening of the other pair of outlet ports until maximum fluid flow is passed therethrough at one predetermined high temperature. Minimum flow may be maintained by providing an intentional clearance between the O.D. of the valve head and the I.D. of the fluid flow chamber in which the valve head is slidably mounted and/or by making a valve head with a length shorter than the spaced distance between the extremities of the sides of the outlet ports. The valve head length can control the length of the dead band or the position where minimum flow is maintained for a given temperature range and the valve head can also be beveled, shaped or contoured to vary the characteristics of the flow of the fluid being controlled.
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Bobis Daniel H.
Braun Leslie
Emerson Electric Co. (H & H Precision Products)
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