Abstract: This paper summarizes that Guangxi Yulin Chengbei Water Treatment Plant completely eliminated the high water pressure pipeline before the pipeline reconstruction and the DN1200 YX741X-10 diaphragm-type adjustable pressure reducing valve produced by Zhuzhou South Valve Manufacturing Co., Ltd. The surrounding environment brings about major security risks, and safe operation of more than a year, stable and reliable decompression effect. Keywords: Diaphragm Maximum Specification Automatic Tracking Pressure Feedback Safe Operation Guangxi Yulin Chengbei Waterworks Water Absorption Source Description: The Yulin City North Waterworks in Guangxi was newly built and put into use in April 2000 with a production capacity of 100,000 units / d, Water intake Su smoke reservoir. The full length of the reservoir to the water plant is 15.2Km, DN1200 prestressed concrete pipe and GRP pipe are used for water conveyance. The vertical height of the water surface of the reservoir to the water plant is 52m (peak period of 61m), and a DN1200 gate valve The factory sedimentation tank set up a DN800 butterfly valve, the middle of the pipeline is not set any other valves, all the water pressure from the pipeline. As the pipelines are long and there is a long pipeline running through the farmland, it is not convenient for daily management and maintenance. In the event of a squib accident, the consequences will be disastrous. Schematic diagram of the pre-transformation conditions: Second, the application of a new adjustable valve For the above conditions there are major security risks, we proposed two technical transformation programs. First: at a distance of 8Km from the reservoir, set up a surge tank. Second: choose the decompression valve for decompression. The first option has decided to use the second option because of its large area, huge occupation of valuable land, large investment in construction, long construction period, inconvenient management and easy secondary pollution of water source. Is: less investment, small footprint, fast construction, there is no secondary pollution of water sources, and be able to quickly and effectively solve this major security issue. After a large amount of market research, analysis and screening in the valve industry of our country, we selected DN1200 YX741X-10 produced by Zhuzhou Nanfang Valve Manufacturing Co., Ltd. The largest domestic diaphragm pressure reducing valve can be used in water Plant diversion pipeline technical transformation project. 1, set the new diaphragm adjustable valve set in the water between the reservoir to the one-way water supply pipeline, using two stages in series step by step decompression. The first level is set 5Km away from the reservoir and the second level is 11.7Km away from the reservoir. The valve is installed horizontally. Before the first stage and before the second stage, a manual butterfly valve is separately set up for overhauling. After the first stage, a DN400 venting valve is also provided to prevent the decompression Overpressure that may result from valve failure. When the valve work, the front and rear butterfly valves are open, under special circumstances closed, this can reduce the number of butterfly valve switching action, so that life expectancy has been improved. After the installation and adjustment of the pressure reducing valve, no external power source or other electric control device is needed. Pressure feedback can be achieved only by the effect of the water pressure itself, and the change of the outlet pressure can be tracked automatically so as to be constant at the set pressure. 2, the use of first-stage pressure relief valve inlet pressure due to the height of its location and the reservoir water seasonal (dry, wet) fluctuations, the pressure before the valve inlet pressure readings reflect the reading to maintain at 0.4-0.45MPa., After the first valve by the valve pilot valve set pressure decompression, the valve outlet pressure gauge readings from the valve can be seen stable at 0.2MPa, and decompression After the pressure is stable, no fluctuations. Through the measurement and simple calculation can be drawn before a valve, the minimum pressure difference after the valve △ P = P1? P2 = 0.2MPa, then the maximum flow of the medium is 3500m3 / h. After the first decompression valve after the first decompression, in the second stage of the valve at the entrance to the pressure gauge reflects the pressure reading of 0.3MPa, the same, through the second stage pressure valve on it Pilot valve set pressure decompression, the second stage relief valve outlet pressure, according to the pressure gauge after the reading of the valve can be seen, the pressure is stable at 0.1MPa, to meet the requirements, the second stage of the valve inlet and outlet minimum The pressure difference is △ P = P1? P2 = 0.2MPa, the pressure after the decompression is also stable and no pressure fluctuations, the maximum flow of medium at this time: 3500m3 / h. When starting the water pump work, the instantaneous pressure slightly lower after the valve, but at this time the main valve on the pilot valve instantaneous pressure drop after the valve through the pilot valve internal pressure feedback to the main valve of the upper chamber, So that the pressure on the cavity decreases, then the opening of the main valve plate increases, the valve pressure increases accordingly, when the valve pressure rose back to pilot valve set pressure, the main valve plate opening remained stable, After this valve pressure remained relatively stable. It can be seen that the pressure reducing valve has the function of automatically adjusting the opening of the main valve according to the change of the pressure of the valve and maintaining the pressure stability after the valve. Measured data from the two depressurization processes from the reservoir to the waterworks and observed using the situation can be seen, the use of YX741X-10 new diaphragm adjustable pressure reducing valve, reliable decompression, pressure regulator valve convenient, Decompression downstream pressure stability, does not fluctuate, there is no decompression process howling. After the transformation of the working conditions map: Three: The new adjustable pressure relief valve purposes, structure and working principle: 1 Use New adjustable pressure relief valve installed in the city one-way water supply pipe, the valve can be higher upstream (import) The pressure is reduced to meet the requirements of the downstream (outlet) pressure, regardless of the upstream pressure and flow changes, set a good downstream pressure remain constant. 2 Structure The new adjustable valve consists of the main valve, pressure feedback system, control piping. The main valve from the valve body, diaphragm seat, valve cover, diaphragm, stem, valve plate and other major components. Pressure feedback system consists of pilot valve assembly and control pipeline. Control by the gate valve, filter, pressure gauge, pipe accessories. 3 Working principle The outlet pressure of the pressure reducing valve is controlled by the adjusting bolt on the pilot valve. It cooperates with the needle valve on the pilot valve. Once the valve is adjusted, the pressure remains constant. When the main valve is opened, the medium flows to the outlet at the same time through the pilot valve into the upper chamber of the main diaphragm chamber, so that the main valve plate opening height stability at a certain value, so that after the valve pressure will be constant. When the outlet pressure increases, the medium through the pressure feedback system to the main valve cavity pressure increases, the main valve upper and lower chamber pressure balance is destroyed, the valve opening value decreases, so that through the opening medium flow rate increases, the kinetic energy changes Cause pressure loss, the pressure after the valve is reduced. On the contrary, when the valve pressure decreases, the main valve plate opening increases, the valve pressure increases. 4 Technical parameters a, the nominal pressure: 1.0MPa b, the outlet pressure: PN1.0MPa adjustment range 0.1MPa-0.8MPa c, suitable medium: raw water, water d, medium temperature: 0 ℃ -80 ℃ 5 Features a new type of adjustable Regulator can be adjusted continuously, decompression, regulator effect is good. Through the pilot valve to form an independent pressure feedback system, and the use of hydraulic principles of control, the outlet pressure from the inlet pressure and flow changes, you can reduce pressure, but also static pressure. b, easy operation and maintenance, just adjust the adjustment of the pilot valve on the pilot valve, you can get accurate and stable outlet pressure, the internal key components are made of high quality materials, without maintenance. c, large caliber, is currently the largest decompression valve. d, the valve body with streamlined wide body design, large flow volume, less resistance loss. e, can replace the middle of the pool, reduce pool area, to avoid secondary pollution of water quality. VI Conclusion In April 2002 we adopted the Zhuzhou Southern Valve Manufacturing Co., Ltd. DN1200YX741X-10 new adjustable valve applied to the north of the city diversion pipeline technical transformation, after a commissioning that is successful and put into Normal use, through the use of more than a year to observe, we believe that the valve is stable and normal, decompression effect is stable and reliable, use has not been any maintenance, and without special management, easy to use, is a safe, Reliable, novel large-scale valve, can be widely used in urban water supply, fire fighting, petrochemical, steel, agriculture and forestry irrigation and other industries, in order to achieve the safe operation of the water supply system, to the automation direction to create the conditions for development is a worthy of promotion New product Author: Chen Minglin: Yulin City, Guangxi North Waterworks Luo Jianqun: Zhuzhou South Valve Co., Ltd. Abstract: This paper outlines the Guangxi Yulin City North Waterworks in the use of Zhuzhou South Valve Manufacturing Co. DN1200 YX741X-10 diaphragm adjustable Pressure valve, the complete elimination of the pipeline before the transformation of the high water pressure to the pipeline and the surrounding environment caused by a major security risks, and safe operation of more than a year, stable and reliable decompression effect. Keywords: Diaphragm Maximum Specification Automatic Tracking Pressure Feedback Safe Operation Guangxi Yulin Chengbei Waterworks Water Absorption Source Description: The Yulin City North Waterworks in Guangxi was newly built and put into use in April 2000 with a production capacity of 100,000 units / d, Water intake Su smoke reservoir. The full length of the reservoir to the water plant is 15.2Km, DN1200 prestressed concrete pipe and GRP pipe are used for water conveyance. The vertical height of the water surface of the reservoir to the water plant is 52m (peak period of 61m), and a DN1200 gate valve The factory sedimentation tank set up a DN800 butterfly valve, the middle of the pipeline is not set any other valves, all the water pressure from the pipeline. As the pipelines are long and there is a long pipeline running through the farmland, it is not convenient for daily management and maintenance. In the event of a squib accident, the consequences will be disastrous. Schematic diagram of the pre-transformation conditions: Second, the application of a new adjustable valve For the above conditions there are major security risks, we proposed two technical transformation programs. First: at a distance of 8Km from the reservoir, set up a surge tank. Second: choose the decompression valve for decompression. The first option has decided to use the second option because of its large area, huge occupation of valuable land, large investment in construction, long construction period, inconvenient management and easy secondary pollution of water source. Is: less investment, small footprint, fast construction, there is no secondary pollution of water sources, and be able to quickly and effectively solve this major security issue. After a large amount of market research, analysis and screening in the valve industry of our country, we selected DN1200 YX741X-10 produced by Zhuzhou Nanfang Valve Manufacturing Co., Ltd. The largest domestic diaphragm pressure reducing valve can be used in water Plant diversion pipeline technical transformation project. 1, set the new diaphragm adjustable valve set in the water between the reservoir to the one-way water supply pipeline, using two stages in series step by step decompression. The first level is set 5Km away from the reservoir and the second level is 11.7Km away from the reservoir. The valve is installed horizontally. Before the first stage and before the second stage, a manual butterfly valve is separately set up for overhauling. After the first stage, a DN400 venting valve is also provided to prevent the decompression Overpressure that may result from valve failure. When the valve work, the front and rear butterfly valves are open, under special circumstances closed, this can reduce the number of butterfly valve switching action, so that life expectancy has been improved. After the installation and adjustment of the pressure reducing valve, no external power source or other electric control device is needed. Pressure feedback can be achieved only by the effect of the water pressure itself, and the change of the outlet pressure can be tracked automatically so as to be constant at the set pressure. 2, the use of first-stage pressure relief valve inlet pressure due to the height of its location and the reservoir water seasonal (dry, wet) fluctuations, the pressure before the valve inlet pressure readings reflect the reading to maintain at 0.4-0.45MPa., After the first valve by the valve pilot valve set pressure decompression, the valve outlet pressure gauge readings from the valve can be seen stable at 0.2MPa, and decompression After the pressure is stable, no fluctuations. Through the measurement and simple calculation can be drawn before a valve, the minimum pressure difference after the valve △ P = P1? P2 = 0.2MPa, then the maximum flow of the medium is 3500m3 / h. After the first decompression valve after the first decompression, in the second stage of the valve at the entrance to the pressure gauge reflects the pressure reading of 0.3MPa, the same, through the second stage pressure valve on it Pilot valve set pressure decompression, the second stage relief valve outlet pressure, according to the pressure gauge after the reading of the valve can be seen, the pressure is stable at 0.1MPa, to meet the requirements, the second stage of the valve inlet and outlet minimum The pressure difference is △ P = P1? P2 = 0.2MPa, the pressure after the decompression is also stable and no pressure fluctuations, the maximum flow of medium at this time: 3500m3 / h. When starting the water pump work, the instantaneous pressure slightly lower after the valve, but at this time the main valve on the pilot valve instantaneous pressure drop after the valve through the pilot valve internal pressure feedback to the main valve of the upper chamber, So that the pressure on the cavity decreases, then the opening of the main valve plate increases, the valve pressure increases accordingly, when the valve pressure rose back to pilot valve set pressure, the main valve plate opening remained stable, After this valve pressure remained relatively stable. It can be seen that the pressure reducing valve has the function of automatically adjusting the opening of the main valve according to the change of the pressure of the valve and maintaining the pressure stability after the valve. Measured data from the two depressurization processes from the reservoir to the waterworks and observed using the situation can be seen, the use of YX741X-10 new diaphragm adjustable pressure reducing valve, reliable decompression, pressure regulator valve convenient, Decompression downstream pressure stability, does not fluctuate, there is no decompression process howling. After the transformation of the working conditions map: Three: The new adjustable pressure relief valve purposes, structure and working principle: 1 Use New adjustable pressure relief valve installed in the city one-way water supply pipe, the valve can be higher upstream (import) The pressure is reduced to meet the requirements of the downstream (outlet) pressure, regardless of the upstream pressure and flow changes, set a good downstream pressure remains constant. 2 Structure The new adjustable valve consists of the main valve, pressure feedback system, control piping. The main valve from the valve body, diaphragm seat, valve cover, diaphragm, stem, valve plate and other major components. Pressure feedback system consists of pilot valve assembly and control pipeline. Control by the gate valve, filter, pressure gauge, pipe accessories. 3 Working principle The outlet pressure of the pressure reducing valve is controlled by the adjusting bolt on the pilot valve. It cooperates with the needle valve on the pilot valve. Once the valve is adjusted, the pressure remains constant. When the main valve is opened, the medium flows to the outlet at the same time through the pilot valve into the upper chamber of the main diaphragm chamber, so that the main valve plate opening height stability at a certain value, so that after the valve pressure will be constant. When the outlet pressure increases, the medium through the pressure feedback system to the main valve cavity pressure increases, the main valve upper and lower chamber pressure balance is destroyed, the valve opening value decreases, so that through the opening medium flow rate increases, the kinetic energy changes Cause pressure loss, the pressure after the valve is reduced. On the contrary, when the valve pressure decreases, the main valve plate opening increases, the valve pressure increases. 4 Technical parameters a, the nominal pressure: 1.0MPa b, the outlet pressure: PN1.0MPa adjustment range 0.1MPa-0.8MPa c, suitable medium: raw water, water d, medium temperature: 0 ℃ -80 ℃ 5 Features a new type of adjustable Regulator can be adjusted continuously, decompression, regulator effect is good. Through the pilot valve to form an independent pressure feedback system, and the use of hydraulic principles of control, the outlet pressure from the inlet pressure and flow changes, you can reduce pressure, but also static pressure. b, easy operation and maintenance, just adjust the adjustment of the pilot valve on the pilot valve, you can get accurate and stable outlet pressure, the internal key components are made of high quality materials, without maintenance. c, large caliber, is currently the largest decompression valve. d, the valve body with streamlined wide body design, large flow volume, less resistance loss. e, can replace the middle of the pool, reduce pool area, to avoid secondary pollution of water quality. VI Conclusion In April 2002 we adopted the Zhuzhou Southern Valve Manufacturing Co., Ltd. DN1200YX741X-10 new adjustable valve applied to the north of the city diversion pipeline technical transformation, after a commissioning that is successful and put into Normal use, through the use of more than a year to observe, we believe that the valve is stable and normal, decompression effect is stable and reliable, use has not been any maintenance, and without special management, easy to use, is a safe, Reliable, novel large-scale valve, can be widely used in urban water supply, fire fighting, petrochemical, steel, agriculture and forestry irrigation and other industries, in order to achieve the safe operation of the water supply system, to the automation direction to create the conditions for development is a worthy of promotion New product Author: Chen Minglin: Yulin City, Guangxi North Waterworks Luo Jianqun: Zhuzhou South Valve Co., Ltd.
Fruit Jar,Baby Cream Jar,Cream Storage Jars,Plastic Cream Jar
SHAOXING CARESO PLASTIC CO., LTD. , http://www.caresoplastic.com