Abstract: Disclosed herein is a back ferrule having a bellows-shaped elastic part. The back ferrule (40) is used, for pipe connection, along with: a connector body (10) having an external thread on an outer circumferential surface thereof; a drive nut (20) having an internal thread on an inner circumferential surface thereof; and a front ferrule (30). The back ferrule (40) includes: a nose part (41) having a front-end inclined surface (41b); a tail part (42) having a rear-end inclined surface (42b); and an outer circumferential surface (43) and an inner circumferential surface (44) connecting the nose part to the tail part. An outer circumferential corrugated surface (45) and an inner circumferential corrugated surface (46) are respectively formed on the outer circumferential surface and the inner circumferential surface between the nose part and the tail part.

Abstract: Disclosed is a module type safety bus bar including: a vertical coupling portion (20) which is a vertically-extending rectangular parallelepiped insulating block, has an upper end provided with a first combining means, and a middle portion into which a bus bar (30) penetrates to be combined with the vertical coupling portion in the form of a cross, the bus bar (30) connecting terminals of a distributor (A) to a circuit breaker (B); and a horizontal coupling portion (10) which is a horizontally-extending rectangular parallelepiped insulating block and has a second combining means, to be combined with the first combining means, in a middle portion of a lower end thereof. The horizontal coupling portion (10) covers an exposed metallic portion of the bus bar after the terminals of the distributor and circuit breaker are connected to each other so that the bus bar (30) becomes safe.

Abstract: A tightness-indicating tube fitting is disclosed. The tightness-indicating tube fitting includes a tube inserted into a body, at least one ferrule disposed around the tube, a nut fastened onto the body to deform the ferrule for providing a seal between the body and the tube, and a check ring having a pressure-receiving section protruding from a side of the check ring facing the nut. The pressure-receiving section has an inner diameter part which is provided with a slope. When the nut is fastened onto the body by the amount of nut rotation corresponding to a predetermined length as the nut moves forwards after having made an initial contact with the slope of the pressure-receiving section, a pressing force of the nut acts on the slope and the check ring is detached from the body by a pressing force of the nut such that a fastened state of the nut is checked.

Abstract: Disclosed herein is a back ferrule having a bellows-shaped elastic part. The back ferrule (40) is used, for pipe connection, along with: a connector body (10) having an external thread on an outer circumferential surface thereof; a drive nut (20) having an internal thread on an inner circumferential surface thereof; and a front ferrule (30). The back ferrule (40) includes: a nose part (41) having a front-end inclined surface (41b); a tail part (42) having a rear-end inclined surface (42b); and an outer circumferential surface (43) and an inner circumferential surface (44) connecting the nose part to the tail part. An outer circumferential corrugated surface (45) and an inner circumferential corrugated surface (46) are respectively formed on the outer circumferential surface and the inner circumferential surface between the nose part and the tail part.

Abstract: Disclosed is a module type safety bus bar including: a vertical coupling portion (20) which is a vertically-extending rectangular parallelepiped insulating block, has an upper end provided with a first combining means, and a middle portion into which a bus bar (30) penetrates to be combined with the vertical coupling portion in the form of a cross, the bus bar (30) connecting terminals of a distributor (A) to a circuit breaker (B); and a horizontal coupling portion (10) which is a horizontally-extending rectangular parallelepiped insulating block and has a second combining means, to be combined with the first combining means, in a middle portion of a lower end thereof. The horizontal coupling portion (10) covers an exposed metallic portion of the bus bar after the terminals of the distributor and circuit breaker are connected to each other so that the bus bar (30) becomes safe.

Abstract: The present invention relates to a valve used to control fluid flow. The valve includes a handle, which is placed above a body and is connected directly or indirectly to a top portion of a stem; a cap, into which the stem is inserted, and which surrounds a top portion of the body, the cap having a plurality of locking holes formed in the circumference of a top portion thereof in a circular arrangement. The handle has a vertical hole corresponding to the locking holes and a key hole extending coaxially with or perpendicularly to the vertical hole, and is connected to the top portion of the stem to contact the top portion of the cap. Locking means is provided in the vertical hole and the locking holes to lock the handle and the cap to each other. The locked position is released using a master key, which is inserted through the key hole, thereby allowing the handle to be operated.

Abstract: A valve which is controlled using a master key such that only an authorized person is able to turn the valve on and off. The valve is constructed such that a fluid passage is controlled by rotating a handle relative to a body, including a locking device for maintaining a locked state of the handle relative to the body. A master key slot, which extends to the locking device, is formed in the handle, so that, when the master key is inserted into the master key slot, the locked state of the handle is released such that the fluid passage can be controlled by the rotation of the handle.

Abstract: The present invention relates to a power distribution panel in which a plurality of loads is connected to an incoming power source. The power distribution panel comprises an input terminal connecting with an incoming power line; a common line extending from the input terminal; a plurality of introduction lines furcating from the common line in parallel; connecting means connecting with different load sides, such as a circuit breaker; and a terminal body comprising a central slot in which the common line is built, a plurality of side slots in which the respective introduction lines are built, an insulation block projectingly formed on the sides of the terminal body, and an identification block for identifying the output terminals of unit source out of the plurality of parallel-connected output terminals. According to the present invention, the input power can be distributed to the load sides conveniently, and a user can flexibly design the electrical stability, if necessary.