Emergency valve closure is a new product developed in recent years. In engineering applications is increasing. In the installation and testing process, we also found a number of problems, some of the construction, some of which were design problems. The quality of products is not only a good product better, the most important thing is to let people see it, be familiar with it, reasonable use of it, it can play a role in the largest Why should use the emergency valve closure we all know,
　　 Fire and life management network has two water supply systems, respectively by the two water pumps. from the pumping station to a very long distance from the building chosen for piped water.
　　 This chosen for the laying of pipeline construction for a larger workload, piping material double identification and maintenance of a manifold is also a lot of inconvenience; Second, the pipeline fire was rarely use, easy to get rusty. Interface and wall thinning due to corrosion in peacetime, not pressure, and the event of a fire, increasing the pressure inside the tubes of a sudden, easily burst, causing fire system could not supply. Third, promote pumps directly from the Shanghai municipal pumping network, not underground pools.
　　 This will not only save the cost of pond construction, while avoiding the pollution of the water. Maintain a clean water, to ensure that the people's health is the most important thing. Because of this a number of advantages, so that the product is gradually being welcomed by everyone. Second, the principle of urgent emergency closed valve hydraulic control valve is closed a valve. Is the main valve, throttle valve, valve, pressure gauge, as well as other takeover tube components. When the main valve inlet pressure below the set pressure valve, valve opening time at state the main valve and pressure relief valve cavity above the main export the same pressure, the pressure difference exists between imports and exports, export-mouth valve on the water outflow. When starting a fire pump, pump pressure or increased pressure over valve setting, links from the main valve guides imports increased pressure control valve, the pressure has increased role in the spring, compress down, driven lower spool. so valve closed when the main throttle valve inlet pressure to continuously add to the main valve with a cavity,
　　 Valve due to the downward pressure being greater than the upward thrust, the main valve closed. Please note the crucial point is that the pressure of imports is less than the set pressure valve has been opened state import pressure than the pressure setting, the valve remained closed. There are so many designers mistaken if an emergency closed valve installed, it will customs, needless to say what conditions, you are wrong. Third, the problems that exist in the project in the actual installation and testing process we have faced a lot of anomalies. put forward for discussion. Hill Road, a residential plume in Shanghai's Pudong.
　　 Water supply network in figure 2, the pump room on the ground floor of residential areas, the 12-storey height of three floors and eight-storey building, and the height 2.8 meters, mmer fire pump pump life are living lift pump 53 meters, 60 meters, fire pump head, 10L/S flow. water in five directions, mmer tube into the roof tanks. Many senior mmer mmer pumps from the same time for the water pipes, water pressure is not high, and only reluctantly entered the water.
　　 Emergency closure of the pressure valve set 0.5MPa, for God is the water pressure does not exceed 0.5MPa. pay only for water. However, if there are four water tanks full, the water level control valve closure, only one dissatisfied with the need to pay for the water tank. At this time the pressure will be higher than 0.5 MPa, emergency valve closure will be closed. one would not pay the remaining water. To pay for a smooth water, we need to pressure stabilized at 0.45MPa. so that it is less than 0.5 MPa, will not lead to the closure. This increase in a pressure relief valve on the pump life. Now most of these units, no pressure relief valve on the pump life. Some units use of electric contact manometer, when the water pressure is tripping over 0.5MPa automatically pumps stopped operating. Water tanks can still solve individual problems. The second problem is when the fire pump start, all closed valve at the opening of a state of emergency.
　　 Mmer mmer pipe pumps in five directions at this time if dissatisfied with the water tank, pressure on falters. 0.5MPa not over until the pool filled with liquid level control valve closed, the pressure can be increased. Here designers should consider increasing pump capacity, or reduced diameter pipe, both at least a difference of 20 stalls. If re-DN100 pumps, pipes replaced DN65 God is, over time, the pressure of 0.5MPa. play a role in closing, we can send fire to the buildings. For example, the residential quarter in Shanghai Kongjianglu DN100 has a fire pump, water mains mmer six routes. still not closed, the pumps and multi-path suitable water supply should be a difference of 20 stalls.
　　 The third problem is that the drainage pumping system, the water should be discharged from the pressure relief valve fire pond or sewer Pai should not be prescribed in a small ravine. Again, let us take the example described above, when God is testing water pipes in the way the way the gradual closure pump the water out of all the results from the pressure relief valve to vent on the basement pump far smaller fire pump, Results underground pumping station was inundated. The best option is to use live fire pump and pump, flow from the constant pressure when debugging. Or using dosing pumps can also increase the pressure relief valve, pressure relief valve essential to the joint use of water mains or sewer pond. sewer pipe diameter than the freshman to stall progress. After the emergency valve closure users through the program better. Fire network and increase the life of a pollution control networks are advised to cut off valve to prevent water pollution fire back. Fourth, the choice of installation location. So far, the majority of customers located on the 105 emergency valve closure of the well.
　　 A closed valve installed in a user emergency stairs, I think, on the stairs, under reasonable and easier debugging and maintenance. If the well on the 105 should provide enough space for the maintenance of some 105 wells area only 40 x 60cm2. and one meter deep, the space is too small maintenance staff can not debugging. No expansion joints and valves at both ends of joints or soft, if no longer accord on the need to discard maintenance. 60 x 105 area of the proposed well 80cm2 depth not too deep for stamping after not touching valve covers a wide margin.
　　 In addition, the increase in demand has led to accept soft valve or elbow joints. The fifth point is that the pipeline should be clean before the opening. We found during the testing process can not be closed emergency shut down valve and remove the pressure from the outside. Valve stay in the memory a little stones doubt, check valves majority of 12 to keep a little stones. two of which are put under the valve cavity filled. Therefore, the installation of an emergency valve closure should be cleaned before the pipeline can guarantee that all the valves normal work.