| 摘要 |
FIELD: power industry. ^ SUBSTANCE: control device of combustible gas supply to burner includes the main gas supply channel in which at least one membrane valve with servo drive is located, which includes valve seat connected to the appropriate shutoff element with membrane control device for seat opening contrary to action of flexible offset device; at that, membrane valve includes the appropriate control electromagnetic valve with electromagnetic control device to control opening/closing of the appropriate valve; at that, electromagnetic valve is provided with possibility of opening/closing of valve of the appropriate control circuit with servo drive in order to control the shutoff element of valve indirectly by means of membrane control device; at that, channel of control circuit brings some part of the main channel, which is located upstream the valve seat relative to direction of gas flow, into interconnection as to fluid medium with the appropriate control chamber of membrane valve. At that, the first side of membrane of membrane control device is subject to action of pressure existing in the appropriate control chamber. The second reverse side of membrane restricts the space which is separated from the part of the main channel, which is located downstream the valve seat so that the second side of membrane is not subject to action of gas supply pressure which exists in the above part of valve downstream the valve seat. ^ EFFECT: invention allows reducing safety hazard when the valve seat is shutoff. ^ 17 cl, 3 dwg |
