A communication system includes a first radio frequency identification (RFID) device coupled to a sensor that monitors a fire condition and a second RFID device. The first RFID device includes at least one first antenna that receives a fire detection signal from the sensor, and a processing circuit that causes the at least one first antenna to transmit a radio frequency (RF) signal corresponding to the fire detection signal through an internal volume of a pipe coupled to a fluid source. The second RFID device includes at least one second antenna that receives the RF signal through the internal volume of the pipe. The second RFID device controls operation of a fluid distribution device responsive to receiving the indication of the fire detection signal.

A flow control device includes a flow shield defining a volume and a plurality of shield openings of the flow shield arranged such that gas entering the volume must pass through at least one of the plurality of shield openings. The flow control device also includes a flow restrictor to define an opening for the gas exiting the volume.

A flow control device includes a flow shield defining a volume and a plurality of shield openings of the flow shield arranged such that gas entering the volume must pass through at least one of the plurality of shield openings. The flow control device also includes a flow restrictor to define an opening for the gas exiting the volume.

A sprinkler includes a body including an internal passageway extending from an inlet to an orifice. The body can be made of a composite material, such as a polymeric material. The sprinkler can include a first frame arm extending from the body, a second frame arm extending from the body, and a connector member connecting the first frame arm with the second frame arm.

A sprinkler includes a body including an internal passageway extending from an inlet to an orifice. The body can be made of a composite material, such as a polymeric material. The sprinkler can include a first frame arm extending from the body, a second frame arm extending from the body, and a connector member connecting the first frame arm with the second frame arm.

A fire-fighting nozzle comprising a tubular inlet having an inlet opening, said inlet extending along a longitudinal axis from said inlet opening toward a shut-off valve, a tubular outlet having at least one nozzle opening, said outlet extending along a transverse axis transverse to said longitudinal axis toward said nozzle opening, the sealing valve being arranged between the inlet and the nozzle opening and sealing the outlet in a sealing region with respect to the inlet, characterized in that a radial distance of the sealing region from the longitudinal axis is smaller than or equal to a smallest radial distance of the inner circumferential surface of the inlet opening from the longitudinal axis in a region between the inlet opening and the sealing region.

A fire-fighting nozzle comprising a tubular inlet having an inlet opening, said inlet extending along a longitudinal axis from said inlet opening toward a shut-off valve, a tubular outlet having at least one nozzle opening, said outlet extending along a transverse axis transverse to said longitudinal axis toward said nozzle opening, the sealing valve being arranged between the inlet and the nozzle opening and sealing the outlet in a sealing region with respect to the inlet, characterized in that a radial distance of the sealing region from the longitudinal axis is smaller than or equal to a smallest radial distance of the inner circumferential surface of the inlet opening from the longitudinal axis in a region between the inlet opening and the sealing region.

Embodiments of a solenoid valve are provided. The solenoid valve includes a solenoid portion with a detection device, a valve body, an armature assembly, and a detection plate. The armature assembly has a first end extending through the solenoid portion and a second end extending into the valve body. The detection plate is configured to interact with the detection device to produce a signal indicating whether the solenoid portion is installed on the valve body. The solenoid portion is disposed between the valve body and the detection plate.

Embodiments of a solenoid valve are provided. The solenoid valve includes a solenoid portion with a detection device, a valve body, an armature assembly, and a detection plate. The armature assembly has a first end extending through the solenoid portion and a second end extending into the valve body. The detection plate is configured to interact with the detection device to produce a signal indicating whether the solenoid portion is installed on the valve body. The solenoid portion is disposed between the valve body and the detection plate.

At least one aspect is directed to a removable sprinkler protection device. The removable sprinkler protection device can include a foldable unitary member. The foldable unitary member can include a first portion having a first extension, a second extension, a third extension, or a fourth extension. The foldable unitary member can include a second portion having a fifth extension, a sixth extension, or a seventh extension. The fourth extension can be disposed at least partially between the first portion and the second portion. The seventh extension can include a tab. The first portion or the second portion can include an opening. The foldable unitary member can be made from at least partially of a biodegradable material.