Emergency shut down the use of pneumatic valve

emergency shutdown pneumatic valve is a new product developed in recent years. In engineering applications is growing. In the process of installation and debugging, we also found some problems, some construction problems, some of them are the problem on the design. A good product not only the quality of the product itself, the most important thing is that should let everybody know it, know it, use it reasonably, to play its biggest role.
why use esd pneumatic valve
as we all know, traditionally fire control pipe network and life are two water supply system, made up of two pumps water respectively, from the pump to building a long distance water supply by two pipes. Such as laying pipeline construction is supplied through larger workload, twice as many as pipe material, and maintenance also identify a pipe inconvenience; Second, fire pipeline years not to use, easy to rust, wall thinning due to corrosion and interface, usually don't have no pressure, and in the event of fire, the pipe pressure increases suddenly, easy to burst, the fire protection system not be water. Third, promote water pump directly from the municipal pipeline pump, no longer set the underground pool. Save the cost of the pool built already so, at the same time avoid the secondary pollution of water. Keep the water clean sanitation, to ensure the health of people in this is one of the most important. With the advantages of this a few aspects, so the product is gradually was welcomed by everyone. Emergency shut down the working principle of pneumatic valve

emergency shutdown pneumatic valve is one of the pneumatic hydraulic control valve. Is by the main pneumatic valve, throttle valve, pneumatic valve, pressure gauge, and to take over and other fittings. When the main pneumatic valve inlet pressure below the guide of pneumatic valve set pressure, guide the pneumatic valve is in open state, at this time the main pneumatic valve cover cavity pressure pneumatic valve outlet pressure is equal, and the main import and export pressure difference, the water flow through the pneumatic valve mouth by export. When the fire pump start-up or variable frequency pump pressure, more than guide pneumatic valve set pressure, the main import wizard pneumatic valve pneumatic valve control pipe pressure, on the spring pressure, pushing down tight, drive down, pneumatic valve core to close the pneumatic valve guide, the main pneumatic valve inlet pressure by throttling the pneumatic valve is added to the pneumatic valve cover pneumatic valve cavity, the pneumatic valve disc under downward pressure is greater than the thrust upward, the pneumatic valve is closed. Please pay attention to the key point is that the inlet pressure is less than the set pressure of the pneumatic valve has been in an open position, the inlet pressure is greater than the set pressure, the pneumatic valve is closed. There are many designers installed pneumatic valve, emergency shut down mistakenly assume that as long as it will pass, don't speak what condition, it would be wrong.
engineering problems that exist in the
we met in the actual installation and debugging process in many unreasonable places, to bring up for discussion. Located in the pudong plume mountain roads is a residential area. This residential area between underground pump house, building three building 10 second and 2, eight level height. Meters, fire pump are all DN life, living pump meters, fire pump head, flow L/S, for water five road, DN pipe into the tank roof. By the DN of the pump at the same time for five road DN pipes, so the water pressure is not high, can barely into the tank. Emergency shut down the pressure pneumatic valve set in. MPa, for five ways of water at the same time, the pressure does not exceed. MPa, only for the tank filling water. However, if there are four water tank is full, the tank liquid level control on pneumatic valve closed, only one water tank water dissatisfaction still need filling water, the pressure will tend to rise, more than. MPa, emergency shutdown pneumatic valve will shut down, the rest of a tank can't filling water. In order to make every tank filling water smoothly, you need to put in pressure stability. MPa, and make it less than. MPa, won't cause to shut down. This needs in the life of pump and a pressure pneumatic valve. Now most of the unit, the life without pressure pneumatic valve on the pump. Some units use the electric contact pressure gauge, when water pressure increases more than. MPa automatically when the trip, water pump stop, it still cannot solve the single tank filling water problems.
the second problem is that when the fire pump start-up, all emergency shutdown of the pneumatic valve is fully open. DN DN pipe pump five road, at this time if the water tank, the water pressure is couldn't get on, can't be more than. MPa, until the pond filling, liquid level control pneumatic valve closed, the pressure to rise. This increase the pump capacity should be taken into account by its designer, or reduce the pipe diameter, both should at least differ second gear, such as water pump instead of DN, five-way pipe instead of DN, the pressure can be over. MPa, have closed effect, can send fire water to the building. Again, for example, in a residential area DN fire pump on the road, jiang six-way water pipe DN, still can't shut down, so the pump and multiple water supply pipe should differ second advisable.
the third problem is that the water pump room of the drainage system, pressure pneumatic valve discharge water should be discharged into fire pool or sewer, should not be on the narrow open trench. Or about the above example, five-way pipe during debugging, all the way along the wind down, the results of the water in the pump out all by pressure pneumatic valve leakage in the basement, is far less than fire pump drainage pump, underground pump house was flooded. Life is the best solution pump and fire fighting all adopt variable frequency pumps, constant water pressure is not affected by flow when debugging. Or with quantitative pump pressure pneumatic valve can also be, but pressure pneumatic valve required by using coupling to the pool or sewer pipes, drains diameter larger than feed line to second gear. After the emergency shutdown solenoid pneumatic valve through the user's plan is better. Between fire control network and life networks should add an anti-pollution isolating pneumatic valve, in case of fire water backflow pollution water.