【 Weak current College 】 on wet alarm valve group with a filter of

Summary: Describes the wet alarm valve unit with the necessity of the filter, if no filter is prone to problems and hazards.

Keywords: wet alarm valve filter

Automatic sprinkler system is recognized as the most effective self extinguishing facilities. Wet sprinkler systems is the automatic sprinkler system and the most important component in preventing fires and fire-fighting early played an important role. According to the relevant statistics, wet sprinkler systems are today the most widely used maximum and effective automatic fire extinguishing system. But in wet sprinkler systems in the most important core wet alarm valve group but often appear foreign objects enter the body, causing the disc close, seriously affect the system to work correctly.

1 alarm valve easy problems

In construction, often with foreign bodies from entering alarm valve causing the disc close strictly phenomenon in various parts of the project are also frequent. As the years construction personnel, I see a lot of related specification, does not require installation of a filter in front of the valve body of mandatory requirements, only a very small fire equipment manufacturers in the product description, alarm valve should add filter before. In fire prevention the installation work construction for many years, I summarize the following easy out problem areas.

(1) large wholesale market, building more common pump but alarm valve group building in monomer. The pumping station to alarm valve before water supply network is too long, long time, construction, construction-construction waste, sand and other foreign material entering the water supply network, wash thorough, and difficult to rinse, time foreign body with pump water supply was rushed into alarm valve body. For example, a large chemical trading market building 2 years, five fire installation company installation, construction time long and cross-construction, use the market devoted 1 year still many times from the alarm valve body clear out building rubbish, left for the accident.

(2) fire sprinkler pump before water supply network no filters, no clean water which foreign bodies from entering alarm valve body. Some design without requires or buyer requirements not strictly in order to reduce the construction cost without installing the pump filter.

(3) fire-fighting water with natural water sources or open top tanks, leading to water sources are polluted, dirt with water to enter the alert network.

2 easy hazards

Alarm valve group plays in the system to boot the system, ensure that the extinguishing water flow, the role of alarm signal. Foreign objects enter the alarm valve body easily the following hazards.

(1) entering the alarm valve through the water supply network into the water spray system, such as soybean grain size into the head, when the fire is the nozzle burst, but no water or spray outlet, to the effect of nozzle protection, easy fire caused the accident. In 2005, a warehouse storage of large quantities of plastic products, line brand impact of fire, when the nozzle is also very little water blasting but cause the fire increased to fight causes difficulties. Subsequent investigation proved that is 1 piece welding slag blocked nozzle.

(2) entering the alarm valve causing the disc close strictly lost check function, hydraulic pressure switch alarm, alarm, fire service duty staff is professional and prone to confusion, close to the effect of hydraulic valves alarm sprinkler system to work properly. Current specification has asked the pressure switch alarm directly start pump, as a result of foreign bodies from entering the body causing alarm valve pressure switch alarm start pumps, if the person on duty found not timely easily fire supply pressure is too high, over time causing pipeline rupture.

(3) some such as sand or something into the valve body, valve one can pass strict alarm valve to check, but the sand will leads to pressure switch, hydraulic pipe alarm slim plug, no matter how water, hydraulic pressure switch alarm, nor will the alarm, the alarm valve lost alarm function. In 2006, a Bureau office building fire sprinkler system debug in this phenomenon: alarm circuit no dirt on filter, alarm valve before and after pressure normal, no matter how hydraulic water pressure switch will not beep alarm. After checking to alarm circuit on line no flow out, open the alarm valve found disc around small eye has been fine sand of the mouth.

Wet alarm valve group is wet sprinkler fire extinguishing system two critical components, and the wet extinguishing system because of its simple structure, the effect is good, low cost, maintenance and easy virtues and extensive application. To sum up, in order to guarantee automatic sprinkling of wet extinguishing system work properly, you should put the wet alarm valve group with a filter as a coercive measure, write to the design, construction, acceptance, to guarantee the normal work of fire-fighting system.