Thermostatic gas valve with standing pilot flow
AssigneeFagor, S. Coop.
InventorJuan José Arabaolaza
Life of this patent
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Abstract
A thermostatic gas valve structure for a kitchen oven comprises a valve body and a body cover, manual and thermostatic valves built into the body to regulate a main flow of said main burner, an actuating shaft traversing said cover and a rotary control coupled to the shaft. The actuating shaft is also provided with reciprocal axial movement so as to push a thermoelectric safety valve, and with a pilot flow passageway departing directly from the safety valve, in order to maintain a standing pilot flow independent of the control turning movements, in which the “off” and “pilot” position markers coincide.
Claims3
A thermostatic valve structure in combination with at least one main burner and a pilot burner for a kitchen oven, comprising:
- a valve body, a valve body front cover and a valve actuating shaft traversing said valve body front cover and coupled to a manual rotary control knob;
- a gas inlet conduit to said valve body for connection to a gas source, an outlet conduit to supply a main flow to said main burner, and a pilot flow outlet to supply a pilot flow to said pilot burner;
- and
- a safety valve housed in said inlet conduit and energised by a thermocouple, at least one manual valve controlled by said manual rotary control knob and connected in series with said safety valve, with sets up a main flow through said valve body, and a thermostatic valve sensitive to variations in oven temperature arranged in series with said manual valve so as to module the main flow output wherein
- said manual rotary control knob and said actuating shaft are provided with means for providing a rotation movement actuating said manual valve as well as a reciprocal axial movement actuating said safety valve;
- such that
- said pilot flow is constant regardless of a position of said manual rotary control knob, said pilot flow being activated during ignition of said pilot burner in a single position between said rotational positions coinciding with the main supply total shut-off position, a direct passage being opened from said safety valve to said pilot flow outlet conduit after a long axial displacement of said actuating shaft and wherein
- said actuating shaft and said front cover are provided with a pin protruding from said actuating shaft and a groove in said front cover which receives said pin in a plot position of said manual rotary control knob to prevent simultaneous rotation and axial movement of said actuating shaft.
Dependencies are inferred from the claim text.