Alarm valve in the construction of the three major application analysis

Alarm valve is the automatic sprinkler system to turn on or off the water, and start the alarm device. In sprinkler system, the alarm valve is a vital component, its role in three: turn on or off the water, the output alarm signal and prevent the water back to the water supply, and through the alarm valve on the system water supply and alarm Device inspection. Alarm valve according to the system is divided into different types of wet alarm valve, dry alarm valve and deluge valve. 1. Wet alarm valve for wet sprinkler system. Its main function is: When the nozzle is turned on, the wet valve can open automatically, and make the water flow into the hydraulic alarm to send the alarm signal. 2. Dry alarm valve for dry sprinkler system. Its valve flap divides the valve into two parts, the outlet side is connected with the system piping and the nozzle, the compressed air is filled in the inlet, and the inlet side is connected with the water source. Dry valve on both sides of the pressure and water pressure on the valve flap torque control valve flap closed and opened, generally can be divided into differential dry-type alarm valve and closed-type dry alarm valve two. 3. Deluge valves are used in rain sprinkler systems, pre-applied sprinkler systems, water curtain systems and water spray-off systems. The inlet side of this valve is connected to a source of water and the outlet side is connected to a system line and a showerhead, generally empty, only inflated in the preaction system. Deluge valve open by a variety of fire detection device control.

Auto Darkening Welding Helmets are amazing masks that have a clear lens when the welding machine doesn't work but within 1/25,000 of a second will turn to dark in order to keep your eyes safe.
The Auto Darkening Welding lens is a great convenience when you`re welding so you have no issues on welding while you would normally be pulling down your dark lens. The auto darkening lens will also protect you against UV and IR wavelengths. Many Auto Darkening welding helmets have high and low sensitivity adjustment as well as automatic power on and off.
Seriously when the welding arc radiation by the light sensor sampling and trigger control circuit, control circuit output voltage to the liquid crystal light valve on the liquid crystal light valve under the effect of electric field, the from transparent to opaque state, uv transmittance is very low.And the part through the liquid crystal light valve infrared ray is absorbed by the filter.Once the arc extinguishing, the light sensor signal, no control circuit is no longer the working voltage, liquid crystal light valve back to transparent state
The main technical requirements
1. Size: The effective observation of size is not less than 90 mm x 40 mm.
2. The original performance: light shading, ultraviolet/infrared transmittance, parallelism should comply with the provisions of the GB3690.1-83.
3. Strengthen performance: the observation window at room temperature with 45 grams of steel ball falling from the height of 0.6 m free continuous impact three times should be without any damage.
4. Response time should comply with the relevant provisions.

Auto-Darkening Welding Helmet

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