Abstract: There is provided a valve enabling complete prevention of leakage and a backflow and having durability and less noise, and further there may be implemented a valve capable of predicting the tendency of occurrence of damage on the functions of the valve before the functions of the valve are actually damaged. In a valve having a valve chamber 5 formed between a fluid inlet 2 and a fluid outlet 3, a valve element 6 disposed in the valve chamber 5 is composed of an elastic member and an inelastic member.

Abstract: Combustion method and apparatus for NOx reduction and CO reduction which are capable of easily achieving super NOx reduction with the value of exhaust NOx under 10 ppm. The combustion method for NOx reduction by controlling the temperature of combustion gas derived from a burner includes in combination the steps of suppressing combustion gas temperature by heat absorbers; suppressing the combustion gas temperature by recirculating burning-completed gas to a combustion-gas burning reaction zone; and suppressing the combustion gas temperature by adding water or steam to combustion-use air of the burner, whereby the temperature of the combustion gas derived from the burner is suppressed.

Abstract: Combustion method and apparatus for NOx reduction are capable of easily achieving NOx reduction to an exhaust NOx value of 30 ppm or under. The combustion method is to perform in combination a first NOx reduction step for suppressing generated NOx value to 60 ppm or under (at 0% O2 in exhaust gas, dry basis) by a low NOx burner, a second NOx reduction step for recirculating exhaust gas of the low NOx burner to a burning reaction zone formed by the low NOx burner, and a third NOx reduction step for adding water or steam to the burning reaction zone.

Abstract: A combustion apparatus for NOx reduction and CO reduction capable of achieving stable NOx reduction with simple means. The combustion apparatus for fulfilling NOx reduction by controlling the temperature of combustion gas derived from a burner 1 includes NOx reduction means having an excess air ratio versus NOx characteristic that generated NOx value decreases with increasing excess air ratio of the burner 1, and an excess air ratio versus CO characteristic that exhaust CO value increases with increasing excess air ratio, and excess-air-ratio control means for controlling the excess air ratio of the burner 1 to a specified excess air ratio, wherein the excess-air-ratio control means includes outside-air temperature detection means 2 and controls the excess air ratio to the specified excess air ratio based on a detection signal derived from the outside-air temperature detection means 42.

Abstract: Combustion method and apparatus for NOx reduction which are capable of achieving NOx reduction with the value of exhaust NOx under 10 ppm, as well as CO reduction at the same time. The combustion method for fulfilling NOx reduction and CO reduction by suppressing temperature of combustion gas derived from a burner comprises a NOx reduction step for suppressing combustion gas temperature in such a manner that suppression of NOx generation is preferred to reduction of exhaust CO value, thereby keeping NOx value not more than a specified value, and a CO reduction step for thereafter reducing exhaust CO value resulting from the NOx reduction step to not more than a specified value.

Abstract: In a method for servicing and maintaining heat supply equipment, which includes making a servicing and maintenance contract to implement equipment performance maintenance, function maintenance, abnormality recovery and a diagnosis for preventive maintenance of the heat supply equipment, providing a communication network of the heat supply equipment, a first computer of a control station and a second computer of a control center communicatable thereamong via communication means, and implementing contents of the servicing and maintenance contract based on information obtained by communications in this network, the method includes receiving abnormality occurrence data, requesting and receiving detailed information, taking measures based on analysis results of these data and information, transferring the abnormality occurrence data, and obtaining and analyzing information for diagnosis.

Abstract: Combustion method and apparatus for NOx reduction are capable of easily achieving NOx reduction to an exhaust NOx value of 30 ppm or under. The combustion method is to perform in combination a first NOx reduction step for suppressing generated NOx value to 60 ppm or under (at 0% O2 in exhaust gas, dry basis) by a low NOx burner, a second NOx reduction step for recirculating exhaust gas of the low NOx burner to a burning reaction zone formed by the low NOx burner, and a third NOx reduction step for adding water or steam to the burning reaction zone.

Abstract: A combustion apparatus for NOx, reduction and CO reduction capable of achieving stable NOx, reduction with simple means. The combustion apparatus for fulfilling NOx, reduction by controlling the temperature of combustion gas derived from a burner 1 includes NOx, reduction means having an excess air ratio versus NOx, characteristic that generated NOx, value decreases with increasing excess air ratio of the burner 1, and an excess air ratio versus CO characteristic that exhaust CO value increases with increasing excess air ratio, and excess-air-ratio control means for controlling the excess air ratio of the burner 1 to a specified excess air ratio, wherein the excess-air-ratio control means includes outside-air temperature detection means 2 and controls the excess air ratio to the specified excess air ratio based on a detection signal derived from the outside-air temperature detection means 42.

Abstract: Combustion method and apparatus for NOx reduction and CO reduction which are capable of easily achieving super NOx reduction with the value of exhaust NOx under 10 ppm. The combustion method for NOx reduction by controlling the temperature of combustion gas derived from a burner includes in combination the steps of suppressing combustion gas temperature by heat absorbers; suppressing the combustion gas temperature by recirculating burning-completed gas to a combustion-gas burning reaction zone; and suppressing the combustion gas temperature by adding water or steam to combustion-use air of the burner, whereby the temperature of the combustion gas derived from the burner is suppressed.

Abstract: Combustion method and apparatus for NOx reduction which are capable of achieving NOx reduction with the value of exhaust NOx under 10 ppm, as well as CO reduction at the same time. The combustion method for fulfilling NOx reduction and CO reduction by suppressing temperature of combustion gas derived from a burner comprises a NOx reduction step for suppressing combustion gas temperature in such a manner that suppression of NOx generation is preferred to reduction of exhaust CO value, thereby keeping NOx value not more than a specified value, and a CO reduction step for thereafter reducing exhaust CO value resulting from the NOx reduction step to not more than a specified value.

Abstract: There is provided a system for servicing and maintaining heat supply equipment which ensures reliable analysis and high efficiency. Heat supply equipment 1 is composed of a control unit 5 to be attached to the heat supply equipment 1, and an equipment-side modem 6 for mediating the control unit 5 and a communication line 4. A management station 3 is composed of a management unit 7 for managing the heat supply equipment 1, and a station-side modem 8 for mediating the management unit 7 and the communication line 4. Upon reception of abnormality occurrence data sent from the control unit 5, the management unit 7 further receives detailed information data on an abnormality of the heat supply equipment 1 from the control unit 5, analyses by itself the received detailed information data, and creates recovery data for recovering the heat supply equipment 1 from the abnormality.

Abstract: There is provided a valve enabling complete prevention of leakage and a backflow and having durability and less noise, and, further there may be implemented a valve capable of predicting the tendency of occurrence of damage on the functions of the valve before the functions of the valve are actually damaged. In a valve having a valve chamber 5 formed between a fluid inlet 2 and a fluid outlet 3, a valve element 6 disposed in the valve chamber 5 is composed of an elastic member and an inelastic member.

Abstract: In heat supply equipment provided with a plurality of maintenance object units, secure and prompt servicing and maintenance is implemented and a burden on a person in charge of managing the heat supply equipment is decreased.

Abstract: There is provided a system for servicing and maintaining heat supply equipment which ensures reliable analysis and high efficiency. Heat supply equipment 1 is composed of a control unit 5 to be attached to the heat supply equipment 1, and an equipment-side modem 6 for mediating the control unit 5 and a communication line 4. A management station 3 is composed of a management unit 7 for managing the heat supply equipment 1, and a station-side modem 8 for mediating the management unit 7 and the communication line 4. Upon reception of abnormality occurrence data sent from the control unit 5, the management unit 7 further receives detailed information data on an abnormality of the heat supply equipment 1 from the control unit 5, analyses by itself the received detailed information data, and creates recovery data for recovering the heat supply equipment 1 from the abnormality.

Abstract: In heat supply equipment provided with a plurality of maintenance object units, secure and prompt servicing and maintenance is implemented and a burden on a person in charge of managing the heat supply equipment is decreased.

Abstract: Boiler efficiency is further improved and the whole boiler body is slimmed down by totally improving heat transfer surfaces confronting gas flow passages, i.e., by forming the heat transfer surface structure into three stages, and moreover by making effective use of the whole heat transfer surfaces of water tubes equipped with fully circumferentially finned water tubes.

Abstract: The water-tube boiler fulfills the reduction in NO.sub.x with a simple constitution, and achieves reduction in NO.sub.x and reduction in CO at the same time with a simple constitution. In the water-tube boiler, a plurality of water tubes (5) are arranged in a zone where burning-reaction ongoing gas derived from a burner (10) is present within a combustion chamber (9), and exhaust gas recirculation equipment (26) is provided to feed part of exhaust gas exhausted from the combustion chamber 9 to the burner 10.

Abstract: A liquid feeding apparatus quantitatively feeds a liquid by pressing and clogging an elastic tube between a press roller and an arc-shaped guide portion through rotational motion of the press roller. The liquid feeding apparatus includes a main unit in which the press roller is provided, and a liquid cassette which accommodates a liquid cartridge. One end of the elastic tube is connected to a reservoir for the liquid to be fed, and the other end is connected to a check valve. The liquid cassette is removably fitted to the liquid feeding apparatus so that the elastic tube is subject to pressing action of the press roller.

Abstract: In a multi-unit installation system of fluid heating units such as hot water boilers, an outstandingly superior responsivity to load variations is obtained, and fluid of stable temperature is supplied by preventing useless starts and stops. In a units count control method, a plurality of fluid heating units (1) are arranged in parallel, these fluid heating units (1) and a load (2) are connected to each other through a fluid supply passage (3) and a fluid return passage (4), and the operated-units count out of the fluid heating units (1) is controlled in response to the load condition, wherein if a fluid supply temperature To in the fluid supply passage (3) is within a preset range, then a current operated-units count is maintained; if the supply temperature To is below the preset range, then the operated-units count is increased; and if the supply temperature To is above the preset range, then the operated-units count is decreased.

Abstract: A combustion flame is distributed so as to cross a group of heat absorbing tubes arranged parallel to and spaced from one another, thereby cooling the combustion flame. A specific temperature zone of approximately 1000.degree. C.-1300.degree. C. for suppressing generation of NO.sub.x and accelerating oxidation of CO is locally formed within the heat absorbing tubes by decimating at least one tube. In the zone, CO generated upstream of the zone is oxidized by reacting with reaction radicals generated by combustion and/or oxygen.