A concealed sprinkler head cover adjusting device includes a valve body formed with a flow channel therein. Both sides of the valve body are formed with an opposing bar along the axial direction of the flow channel. A shell is clamped on the opposing bars and is formed with a first accommodating space. A bottom cover is fixed to the bottom of the shell and is inwardly concaved formed a second accommodating space. A restriction site is formed on the outer wall of the opposing bars along the axial direction of the flow channel, both sides of the shell are symmetrically formed with a guiding part and a plurality of clamping parts, and the guiding parts guide the opposing bars to allow the clamping parts adjust the clamping position on the restriction site, thereby adjusting the position of the valve body in the first and second accommodating spaces.

A dry sprinkler has a casing tube having an inlet orifice and an outlet orifice. When the sprinkler is in a non-actuated state, an inlet seal assembly operatively seals the inlet orifice and an outlet seat assembly operatively seals the outlet orifice. A translating member extends through the casing tube between an inlet and an outlet. The translating member axially translates from a first position, in which the translating member retains the inlet seal assembly in a sealed state, to a second position, in which the translating member releases the inlet seal assembly, toward the outlet when the outlet seat assembly is released. The sprinkler has a nominal K-factor greater than 17 gpm/(psi).sup.1/2. In addition, a difference between a cross-sectional area of the casing tube and a cross-sectional area bounded by an outer perimeter of the translating member is more than 30% of the cross-sectional area of the casing tube.

A dry sprinkler has a casing tube having an inlet orifice and an outlet orifice. When the sprinkler is in a non-actuated state, an inlet seal assembly operatively seals the inlet orifice and an outlet seat assembly operatively seals the outlet orifice. A translating member extends through the casing tube between an inlet and an outlet. The translating member axially translates from a first position, in which the translating member retains the inlet seal assembly in a sealed state, to a second position, in which the translating member releases the inlet seal assembly, toward the outlet when the outlet seat assembly is released. The sprinkler has a nominal K-factor greater than 17 gpm/(psi).sup.1/2. In addition, a difference between a cross-sectional area of the casing tube and a cross-sectional area bounded by an outer perimeter of the translating member is more than 30% of the cross-sectional area of the casing tube.

A sprinkler assembly includes a body defining an inlet, an outlet, and a fluid passage extending along a longitudinal axis between the inlet and the outlet. A guide pin aperture is defined by at least one of the body or a bushing coupled to the body. The sprinkler assembly further includes a deflector slidably coupled to the body. The deflector includes a deflector body coupled to a guide pin. The guide pin includes a shaft portion extending through the guide pin aperture and a shoulder that is wider than the shaft portion and configured to engage at least one of the body or the bushing to limit movement of the deflector body away from the body.

A sprinkler assembly includes a body defining an inlet, an outlet, and a fluid passage extending along a longitudinal axis between the inlet and the outlet. A guide pin aperture is defined by at least one of the body or a bushing coupled to the body. The sprinkler assembly further includes a deflector slidably coupled to the body. The deflector includes a deflector body coupled to a guide pin. The guide pin includes a shaft portion extending through the guide pin aperture and a shoulder that is wider than the shaft portion and configured to engage at least one of the body or the bushing to limit movement of the deflector body away from the body.

A fire extinguishing device includes a pressure fire extinguishing agent and an accommodating space (1) capable of storing the fire extinguishing agent. A lot of cut-through ejecting openings (2) are defined in an outer wall of the accommodating space (1), and the ejecting openings (2) are plugged by plugging pieces (3) made of a pressure-resistant meltable fireproof material. In the case of a local temperature rise or an open fire of the target in an airtight or semi-airtight space, the plugging piece (3) on the ejecting opening (2) is melted to make the ejecting opening (2) cut through, the pressure fire extinguishing agent stored in the accommodating space is further ejected from the ejecting opening (2) to suppress a fire point or a high temperature point of the target, therefore the fire is controlled at the first time.

A fire extinguishing device includes a pressure fire extinguishing agent and an accommodating space (1) capable of storing the fire extinguishing agent. A lot of cut-through ejecting openings (2) are defined in an outer wall of the accommodating space (1), and the ejecting openings (2) are plugged by plugging pieces (3) made of a pressure-resistant meltable fireproof material. In the case of a local temperature rise or an open fire of the target in an airtight or semi-airtight space, the plugging piece (3) on the ejecting opening (2) is melted to make the ejecting opening (2) cut through, the pressure fire extinguishing agent stored in the accommodating space is further ejected from the ejecting opening (2) to suppress a fire point or a high temperature point of the target, therefore the fire is controlled at the first time.

A horizontal sidewall sprinkler is provided which includes a sprinkler body having an inlet passage for supply of a fluid and an outlet, the outlet being closed by a sealing assembly prior to actuation of the sprinkler. The sprinkler further includes a sleeve body secured to the sprinkler body and a yoke substantially spanning a width of the sleeve body, the yoke urging a load screw against a surface of the sealing assembly facing an occupancy, and being held in place prior to actuation of the sprinkler by two levers that are joined by a soldered link. A slide plate is located near an inner wall of the sprinkler body facing the occupancy prior to actuation of the sprinkler. According to one example embodiment, a frame or two guide pins are provided for bearing and supporting a deflector. The deflector is positioned between the load screw and the sealing assembly thereby obstructing a flow of fluid from the outlet upon actuation of the sprinkler. A spring is provided in the sprinkler body, between the inner wall of the sprinkler body and pressing (1) the slide plate and (2) the frame or the two guide pins away from the inner wall. Upon actuation of the sprinkler, the levers, the yoke and the load screw are forced out of and away from the sprinkler by the force of the fluid; the spring forces the slide plate outward from the inner wall; and the force of the fluid moves the deflector away from the slide plate to a position for delivery of the fluid to the protected area.

A concealed sprinkler includes a sprinkler body having a flow passage therethrough with an inlet end and an outlet end. A closure device is secured at the outlet end of the flow passage by a heat responsive trigger. A deflector assembly includes a deflector plate and a button secured to an upstream side of the deflector plate. The deflector assembly is movably supported to the sprinkler body by at least one arm. The button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side.

A concealed sprinkler includes a sprinkler body having a flow passage therethrough with an inlet end and an outlet end. A closure device is secured at the outlet end of the flow passage by a heat responsive trigger. A deflector assembly includes a deflector plate and a button secured to an upstream side of the deflector plate. The deflector assembly is movably supported to the sprinkler body by at least one arm. The button defines an aperture that extends unobstructed all the way through the button from an upstream side to a downstream side.