Dry Wet Type Alarm Valve Fire Fighting Equipment

• Type: Outdoor Fire Hydrant
• Decompression: Normal Fire Hydrant
• Rotation: Ordinary Bolt
• Outdoor Fire Hydrant Type: High-Pressure Fire Hydrant
• Fire Hydrant Type: Ordinary
• Rate Working Pressure: 12bar
• Model NO.: ZSFC100
• Seal Test: 24bar
• Strength Test: 48bar
• Transport Package: Packing by Wood Box
• Specification: ZSFC100
• Trademark: sanxing
• Origin: Quanzhou, Fujian, China
• HS Code: 8481804090

Product Description

product description

The dry alarm valve is an important component of the dry automatic water spray system. The dry automatic sprinkler system is designed to meet the needs of installing automatic sprinkler systems in cold and high-temperature places. 
It is a closed system which developed on the basis of the wet system. The dry system adopts a closed fire sprinkler. Due to in the pipe network at the system side is the pressure gas (compressed air or nitrogen gas), so the phenomenon of the pressurized water frozen or evaporation when the wet system is used can be avoided.

technical parameters

specification	ZSFC100	ZSFC150	ZSFC200
rate working pressure(Mpa)	1.2	1.2	1.2
seal test(Mpa)	2.4	2.4	2.4
strength test(Mpa)	4.8	4.8	4.8
nominal diameter	DN100	DN150	DN200
flange diameter(mm)	220	285	340
synnetric hole diameter (mm)	180	240	295
screw hole number and diameter(mm)	8*Φ18	8*Φ22	12*Φ22

working principle
before starting,the pipeline in front of the dry alarm valve(on the side connected to the water source) is filled with pressurized water ,the pipeline behind with compressed air,and the alarm valves is closed.
in the event of a fire,the thermal sensor of the closed nozzle, whichreduces the pressure on the outlet side of the dry valve ,causing the water pressure in the front of the alarm valve to be greater than air pressure in the rear.
the dry alarm valve is automatically opened ,the supply pipe,pushes the remaining compressed air from the opened nozzle ,and then sprays water to extinguish the fire.
when the dry alarm valve is opened,the passage to the hydraulic alaem bell and the pressure switch is also opened,and the water impacts the hydraulic alarm bell and the pressure switch ,and the pump is pressurized t osupply water.