Abstract: A substantially ring-shaped seat section (8) protrudes from an inner circumference wall in a through hole (4) of a container attaching section (6) made of a metal. On an outer circumference of an electrode shaft (3) held in the through hole (4) through an insulator (5) made of a synthetic resin, locking protrusions (13, 14), which have a diameter larger than a hole diameter of the seat section (8), are provided at a distance from the seat section (8), on at least inner side or outer side of the seat section (8) in a shaft direction of the electrode shaft (3). Thus, for instance, when the inside of the metal container (2) is at a high temperature, the insulator (5) is destroyed and the electrode shaft (3) is to jump out from the container attaching section (6) to the outside or the inside of the metal container (2), the locking protrusions (13, 14) lock the seat section (8) and prevent the electrode shaft (3) from jumping out.

Abstract: Provided is a needle valve in which a gap between a valve casing and a needle is reliably sealed and an origin of the needle can be readily obtained with high precision. A needle (6) is screwed into a cylindrical rotor (44) of a stepping motor (7) so as to be retractable, and a rotation regulating member (47) prevents the needle (6) from rotating together with the rotor (44). Accordingly, in a case of driving the motor (7) to rotate the rotor (44), the needle (6) vertically moves without rotating. A lower limit sensor (61) and an upper limit sensor (60) detects a detection target piece (49) provided to the rotation regulating member (47), so a lower limit position and an upper limit position of the needle (6) are obtained. The motor (7) is controlled such that, after the motor (7) is driven until the lower limit sensor (61) detects the detection target piece (49), an origin sensor (71) monitors an origin detection plate (62) so as to stop at a predetermined rotation stop position.

Abstract: A cutoff valve having an upstream valve part and a downstream valve part which are assembled in series in a flow passage. Each of the valve elements at the valve parts are formed separably stacking a large diameter first valve element and a small diameter second valve element on each other. The first valve element is formed of elastic material and the second valve element is formed of rigid material. A valve shaft is passed through the center of the first valve element, and the tip of the valve shaft is connected to the second valve element. A first valve element moving component which moves the center part of the first valve element in a direction apart from the second valve element in the state of being engaged with the first valve element when the valve is opened is installed between the first valve element and the valve shaft.

Abstract: Provided is a needle valve in which a gap between a valve casing and a needle is reliably sealed and an origin of the needle can be readily obtained with high precision. A needle (6) is screwed into a cylindrical rotor (44) of a stepping motor (7) so as to be retractable, and a rotation regulating member (47) prevents the needle (6) from rotating together with the rotor (44). Accordingly, in a case of driving the motor (7) to rotate the rotor (44), the needle (6) vertically moves without rotating. A lower limit sensor (61) and an upper limit sensor (60) detects a detection target piece (49) provided to the rotation regulating member (47), so a lower limit position and an upper limit position of the needle (6) are obtained. The motor (7) is controlled such that, after the motor (7) is driven until the lower limit sensor (61) detects the detection target piece (49), an origin sensor (71) monitors an origin detection plate (62) so as to stop at a predetermined rotation stop position.

Abstract: A valve body (11) is formed by separably superimposing, one upon the other, a large diameter first valve body portion (11a) in contact with a first valve seat portion (7a) formed on the inlet side of a valve hole (8), and small diameter second valve body portion (11b) in contact with a second valve seat portion (7b) formed on the outlet side of the valve hole (8). The first valve body portion (11a) is formed of an elastic material, and at least the portion of the second valve body portion (11b) other than the portion in contact with the second valve seat portion (7b) is formed of a rigid material. At the center of the first valve body portion (11a), there is formed a through-hole (18) through which the valve operating shaft (10) is passed. The forward end of the valve operating shaft (10) passed through the through-hole (18) is connected to the second valve body portion (11b).

Abstract: To provide at low cost a check valve which is relatively lightweight and not limited in applicable range thereof, has a good sealing property, and exhibits excellent pressure resistance and durability, a valve chamber (5) is formed between a fluid inlet (3) and a fluid outlet (4) in a valve casing (2), a valve seat (7) is formed to have a valve hole (6) on a fluid inlet (3) side of the valve chamber (5), and a valve body (11) is provided in the valve chamber (5) so as to be movable in a direction in which fluid flows and to be brought into contact with the valve seat (7) from a fluid outlet (4) side, the valve body (11) including, when seen from the fluid inlet (3) side, a first valve body portion (11a) and a second valve body portion (11b) which respectively have a small diameter and a large diameter, the valve seat (7) including a first valve seat portion (7a) and a second valve seat portion (7b) with which the first valve body portion (11a) and the second valve body portion (11b) are brought into contact,

Abstract: A substantially ring-shaped seat section (8) protrudes from an inner circumference wall in a through hole (4) of a container attaching section (6) made of a metal. On an outer circumference of an electrode shaft (3) held in the through hole (4) through an insulator (5) made of a synthetic resin, locking protrusions (13, 14), which have a diameter larger than a hole diameter of the seat section (8), are provided at a distance from the seat section (8), on at least inner side or outer side of the seat section (8) in a shaft direction of the electrode shaft (3). Thus, for instance, when the inside of the metal container (2) is at a high temperature, the insulator (5) is destroyed and the electrode shaft (3) is to jump out from the container attaching section (6) to the outside or the inside of the metal container (2), the locking protrusions (13, 14) lock the seat section (8) and prevent the electrode shaft (3) from jumping out.

Abstract: A check valve has an elastic valve body portion and an inelastic valve body portion and a valve seat. The valve body is fixed to a valve shaft, and a valve body abutment plate for abutting the elastic valve body portion is supported to the valve shaft. The valve body abutment plate includes an elastic valve body portion pressing portion for pressing on an outer peripheral portion of the elastic valve body portion and a backflow fluid pressure exerting hole for causing fluid pressure from the fluid outlet side to be exerted on the elastic valve body portion. A spring for urging the valve body into abutment with the valve seat through the valve body abutment plate is interposed between the valve body abutment plate and a shaft support portion provided on the fluid outlet side.

Abstract: A valve includes: a valve casing (1); a valve chamber (4) defined between a fluid inlet (2) and a fluid outlet (3) of the valve casing (1): and a plurality of check valve mechanisms (9) arranged in series within the valve chamber (4), the plurality of check valve mechanisms (9) each including: a valve seat (6) having a valve hole (5) formed therein: and a valve body (8) fixed to a valve shaft (7) and arranged on a fluid outlet (3) side of the valve seat (6), the valve shaft (7) passing through the valve hole (5) of the valve seat (6) and movably supported on a fluid inlet (2) side and the fluid outlet (3) side of the valve seat (6), the valve body (8) being adapted to move away from the valve seat (6) to open the valve hole (5) when applied with a fluid pressure from the fluid inlet (2) side and adapted to move toward and into contact the valve seat (6) to close the valve hole (5) when applied with a fluid pressure from the fluid outlet (3) side.

Abstract: Provided is a damper position adjusting device allowing adjustment of the position of a damper and capable of detecting any possible rotational abnormality in the damper. The damper position adjusting device is applied to a combustion apparatus such as a boiler 1, and is provided for a damper 8 for adjusting the amount of air supplied to a burner 2 of the combustion apparatus. The damper position adjusting device is equipped with a stepping motor 23 for rotating the damper 8 about a rotation axis 9 thereof, a detected plate 33 provided so as to be capable of rotating integrally with the rotation axis 9 of the damper 8, a detector 34 for detecting a slit 35 formed in the detected plate 33, and a controller 49.

Abstract: A first valve portion and a second valve portion are arranged in series in a flow passage within a valve casing to open and close the flow passage. The first valve portion includes a first valve seat, a first valve element supported to a first valve shaft and adapted to make an axial reciprocating movement into contact with or away from the first valve seat, and an opening and closing drive unit composed of a motor and a motion converting mechanism that converts a rotary motion into a linear motion, the opening and closing drive unit causing the first valve shaft to make a reciprocating movement and capable of effecting a flow rate control and slow valve-opening for the flow passage.

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: A first valve portion and a second valve portion are arranged in series in a flow passage within a valve casing to open and close the flow passage. The first valve portion includes a first valve seat, a first valve element supported to a first valve shaft and adapted to make an axial reciprocating movement into contact with or away from the first valve seat, and an opening and closing drive unit composed of a motor and a motion converting mechanism that converts a rotary motion into a linear motion, the opening and closing drive unit causing the first valve shaft to make a reciprocating movement and capable of effecting a flow rate control and slow valve-opening for the flow passage.

Abstract: A valve includes: a valve casing (1); a valve chamber (4) defined between a fluid inlet (2) and a fluid outlet (3) of the valve casing (1): and a plurality of check valve mechanisms (9) arranged in series within the valve chamber (4), the plurality of check valve mechanisms (9) each including: a valve seat (6) having a valve hole (5) formed therein: and a valve body (8) fixed to a valve shaft (7) and arranged on a fluid outlet (3) side of the valve seat (6), the valve shaft (7) passing through the valve hole (5) of the valve seat (6) and movably supported on a fluid inlet (2) side and the fluid outlet (3) side of the valve seat (6), the valve body (8) being adapted to move away from the valve seat (6) to open the valve hole (5) when applied with a fluid pressure from the fluid inlet (2) side and adapted to move toward and into contact the valve seat (6) to close the valve hole (5) when applied with a fluid pressure from the fluid outlet (3) side.

Abstract: Disclosed is a check valve in which a valve body (11) is composed of an elastic valve body portion (12) and an inelastic valve body portion (13), a valve seat (7) is composed of a first valve seat portion (14) and a second valve seat portion (15), and the valve body (11) is fixed to a valve shaft (18) passing though a center of the valve body (11) and supported in position so as to be axially movable, in which a valve body abutment plate (22) capable of abutting the elastic valve body portion (12) from the fluid outlet (4) side is supported to the valve shaft (18) so as to be axially movable, the valve body abutment plate (22) being provided with: an elastic valve body portion pressing portion (23) for pressing on an outer peripheral portion of the elastic valve body portion (12); and backflow fluid pressure exerting holes (25) for causing the fluid pressure from the fluid outlet (4) side to be exerted on the elastic valve body portion (12), and in which springs (27) for urging the valve body (11) into abutme

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: 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.