Fire Fighting & Safety Equipment Supplier - Butterfly Valves and its characters

 

Fire Fighting Safety Equipment Supplier

There are many types of butterfly valves, including quick cut-off and continuous adjustment, Pneumatic butterfly valves , electric butterfly valves are mainly used for liquid and gas low pressure large diameter pipelines. It is suitable for occasions where the pressure loss is not high, flow adjustment is required, and the opening and closing requirements are fast; usually the temperature is below 300 ℃ and the pressure is below 40 kg (butterfly valves generally use low pressure, like domestic ones. It is rare to achieve CL600). The medium is generally used for water and gas, and the medium is not demanding. Granular medium can also be used.

As a sealed butterfly valve, it brought rapid development after the emergence of synthetic rubber, so it is a new type of shut-off valve. Butterfly valves were mainly used for low-pressure valves, and the valve seat was made of synthetic rubber. By the 1990s, due to increased exchanges with foreign countries, hard seal  but, hard seal butterfly valves  developed rapidly. At present, there are many valve factories that can produce medium-pressure metal-sealed butterfly valves stably, which makes the application field of butterfly valves wider.

The media that the butterfly valve can transport and control are water, condensate, circulating water, sewage, sea water, air, gas, liquid natural gas, dry powder, mud, fruit pulp and mixtures with suspended solids.

Butterfly valves are suitable for flow regulation. 

Since the pressure loss of the butterfly valve in the pipeline is relatively large, about three times that of the gate valve,  when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium should also be considered. In addition, it is necessary to consider the limitation of the working temperature of the elastic valve seat material at high temperature. The structural length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making large-diameter valves. When the butterfly valve is required to control the flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.

1. Generally, in throttling, regulating control and mud medium, the structure length is short and the opening and closing speed is fast (1/4 revolution). Low pressure cut-off (small pressure difference), butterfly valve is recommended.

2. The butterfly valve can be used when two-position adjustment, narrow passage, low noise, cavitation and vaporization phenomenon, a small amount of leakage into the atmosphere, and abrasive media.

3. When the butterfly valve is used under special conditions, such as throttling adjustment, or strict sealing requirements, or severe wear, low temperature (cryogenic) and other operating conditions, it is necessary to use a specially designed metal seal with a triple eccentric or double eccentric adjustment device Special butterfly valve for ground.

4. The center line butterfly valve is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, and oil that require complete sealing, zero gas test leakage, high life requirements, and working temperature of -10℃~150℃ And various acid and alkali and other pipelines.

5. The soft-sealed eccentric butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways in metallurgy, light industry, electric power, and petrochemical systems. Sendhamarai Engineering is the authorised dealer of Lehry Valves

Related Tag : Fire Fighting, Fire Safety, Fire Fighting Equipments, Fire Safety Equipments, fire safety equipment suppliers, fire fighting equipment suppliers, fire fighting system, fire safety sprinkler system, fire sprinkler types, fire sprinkler price, fire sprinkler temperature, fire sprinkler systems, fire sprinkler, fire sprinkler extension, fire sprinkler nozzle, fire sprinkler pipe, fire extinguisher, fire fighting system, fire fighting equipment, fire fighting company in chennai, fire safety, fire safety equipment, fire safety equipment suppliers, fire safety equipment in chennai, fire safety equipment list, fire safety equipment near me, fire hydrant system, fire hydrant valve

Types of Fire Sprinkler used in industrial fire fighting and safety

 

Fire Sprinklers

Wetpipe systems Fire Sprinklers:-

Wet pipe systems is the most commonly used fire sprinkler systems. Because it is very reliable and at the same time  simple. Basically it works like- in the event of a fire, water is provided to the piping via the sprinklers heads by an automatic water supply.

 

Drypipe systems Fire Sprinklers:-

It is a  popular fire sprinkler system type. They are usually installed in unheated buildings i.e.. Parking  garages for example. Here the low ambient temperature may freeze the water in an ordinary wet pipe system, making it useless.

Therefore, in this kind of sprinkler system, the water in the piping is replaced by air at a pressure below the water supply pressure. When one or more of the automatic sprinkler heads is activated, it opens so the air in the piping can come out from that sprinkler. The drop of the air pressure in the piping allows water to vent and control the fire.

 

Delugesystems Fire Sprinklers:-

In this type of system all the sprinklers connected to the water piping are open in order to provide a simultaneous jet of water over the entire environment in case of fire. Indeed, they are usually installed in locations where the risk of rapid fire spread is high.

In the event of fire, an alarm activates. This signals the deluge valve to open allowing water to flow from the piping system.

 

Pre-actionsystems Fire Sprinklers:-

Pre-action systems  are used in places where accidental activation of the fire sprinklers should be avoided  in the places like museums or Data Centres etc…...

There are two types of pre-action systems: single interlock and double interlock. The first is similar to dry pipe systems in the way they operate but in this case the vent of water is preceded by a prior fire detection event (the activation of a smoke detector for example). The system is converted from a dry to a wet system, in order to reduce the delay of water distribution to the piping that usually happens in dry systems.

The double interlock pre-action systems are similar to deluge systems but, unlike the latter, they are provided with automatic sprinklers. Also, they require that both a prior fire detection event and an automatic sprinkler activation take place before the water comes to the system piping. Otherwise, water will not get into the piping.

 

Foamwater sprinkler systems Fire Sprinklers:-

This special kind of sprinkler system discharges a mixture of water and foam concentrate if activated. They are generally used in case of high challenge fires, such as in the presence of flammable liquids. The foam can be inserted in any of the systems described above.

Waterspray systems Fire Sprinklers:-

Water spray systems are identical to deluge systems but, unlike the latter, the first are designed to safeguard a uniquely configured hazard (so they don’t cover all the horizontal floor area of a space). Electrical transformers, for example, are usually protected by a water spray system.

 

Watermist systems Fire Sprinklers:-

This kind of system is typically used in conditions where water may damage things or in case of minimal water supplies. They are provided with a heat absorbent vapour and operate as a wet pipe, deluge, dry pipe or pre-action system. In this case a compressed gas is used to atomise the water, so it turns into a mist.