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GPQDS848-P Fully Automatic Dual-Control Hemisphere Valve https://imgsa.baidu.com/forum/w%3D580/sign=070390835bda81cb4ee683c56267d0a4/5c49d9198618367a70d907aa24738bd4b31ce50a.jpg I. Product Introduction and Applications 1. Background of Technical Development In industrial and municipal water supply, sewage treatment, as well as industrial process cooling systems, multi-valve systems consisting of check valves, globe valves, and water hammer arrestors were commonly used in the past to meet the specific requirements for starting and stopping water pumps, thereby enabling gentle startup and eliminating water hammer effects. However, it has problems such as a short service life, high resistance, high energy consumption, difficulty in manufacturing large diameters, large space occupation, and especially high labor intensity. Later, with the development of science and technology, various types of water pump control valves emerged, such as those controlled by hydraulic systems, multi-functional water pump control valves, hydraulically controlled hemispherical butterfly valves, and pipe force valves. The emergence of these valves contributed to the development of water pump control technology to a certain extent, but with the progress of industry and the advancement of times, the shortcomings of these water pump control valves gradually became apparent. If some valves require an external power source, have a complex structure, and are difficult to maintain ； Some have a high flow resistance coefficient, while others have a large volume, which makes it difficult to manufacture large-diameter valves. The main problem is that the automatic control mechanism relies on the medium flowing inside the pipe for propulsion, which can lead to blockages and corrosion in the control system, resulting in control failures and difficulties in maintenance; as a result, such valves have a limited range of applications. This product is a new type of pump control valve series that makes full use of the pressure energy of the medium itself in the pipeline to convert it into hydraulic energy, thereby enabling the control valve to open slowly, open quickly, close rapidly, or close slowly as required. It meets the demands for automatic water pumping control; in particular, it overcomes the problems of easy clogging in harsh working conditions such as with slurry, sewage, and mud, as well as corrosion in corrosive media like seawater. It also addresses the various shortcomings of existing pump outlet valves, and is in line with the trends toward automated, energy-efficient, and environmentally friendly valves. 2. Functions and Applications: The fully automatic dual-control hemispherical valve is installed at the outlet of slurry pumps, pulp pumps, sewage pumps, mud pumps, and clean water pumps. It is primarily used in industries such as electricity, metallurgy, mining, petrochemicals, pharmaceuticals, sewage treatment, seawater transportation, and urban water supply and drainage. It not only eliminates water hammer but also features low resistance, energy efficiency, and low overall costs. II. Main Features and Advantages 1. The fully automatic dual-control hemispherical valve is the fifth-generation, latest water pump control valve developed by Shaoyang Gaopin Hydraulic Valve Company. The control structure is a world first. This product not only possesses all the functions of the previous four generations of pump control valves, but also expands the range of applications for such valves. It overcomes the previous shortcomings associated with water quality issues, such as the failure of the control valves to function, easy damage to the diaphragms, and frequent jamming of the piston cylinders. 2. The slow opening and closing control device for this valve is independently controlled by a hydraulic controller; there are no external bypass pipelines. The controller contains hydraulic oil, which has no connection to the medium inside the pipes. Therefore, this valve can be used in any operating condition at the pump outlet. 3. The power required to open and close the valve is derived from the pressure energy of the medium in the pipeline. The controller makes use of the pressure difference before and after the valve to operate it, thus eliminating the need for an external power source. When the water pump starts or stops, the valve operates automatically in accordance with the pump’s operating pattern, without the need for manual, electrical, pneumatic, or hydraulic intervention. It features automatic slow opening, fast opening, rapid closing, and slow closing, ensuring safe and reliable operation. 4. It features a large flow area and a small cross-sectional area of the valve plate, resulting in an operating resistance 70% lower than that of ordinary water pump control valves, thus offering significant energy-saving benefits. The resistance coefficient of this valve ranges from 0.2 to 0.5, and the value of this coefficient is related to the energy consumption, which is what is commonly referred to as operating costs. 5. The sealing surface of the valve body is conical, while the sealing surface of the valve disc is spherical. The sealing surface material is stainless steel or cemented carbide, etc. The sealing surface is of hard-sealing type, and the sealing mechanism is linear sealing; as a result, the overlapping area of the sealing surfaces is small, resulting in a high sealing specific pressure. It represents a true zero-to-zero, direct metal-to-metal hard-sealing approach. The valve plate can cut off, crush, and displace various fibrous, granular suspended and semi-suspended impurities. It can also effectively crush and remove scale. Due to the three-eccentric structure of this product, the spherical valve disc can automatically align itself with the center, automatically compensating for wear on various sealing surfaces; as a result, the service life of this valve is much longer than that of similar products. 6. This product is not affected by the medium; it can be used in various complex applications such as clean water pumps, slurry pumps, sewage pumps, and mud pumps, as well as in corrosive media like seawater. III. Explanation of model designation: IV. Installation dimensions of the dual-control valve https://imgsa.baidu.com/forum/w%3D580/sign=76a91c9d8bcb39dbc1c0675ee01709a7/1401a718367adab4e180633481d4b31c8701e40a.jpg https://imgsa.baidu.com/forum/w%3D580/sign=fdb7cc8c33dbb6fd255be52e3925aba6/6a00177adab44aed821ec693b91c8701a18bfb0a.jpg V. Installation diagram https://imgsa.baidu.com/forum/w%3D580/sign=2ca6749cbcfd5266a72b3c1c9b199799/da62fbb44aed2e7326b9fe5b8d01a18b87d6fa0a.jpg VI. Structural principle: This valve is mainly composed of a valve body, valve plate, valve stem, and controller. The valve plate is fixed to the valve stem by tapered pins and rotates within the valve body, thereby controlling the flow of the medium. The other end of the valve stem is connected to a rotating shaft inside the controller; this shaft rotates within the controller’s valve body, and its rotation pattern meets the requirements for starting and stopping the water pump. The shaft controls the valve plate to open slowly, open quickly, close rapidly, or close slowly, with the speeds for slow opening and closing being regulated by a speed control valve. VII. Technical parameters: Nominal diameter: DN80–4000 mm; Nominal pressure: 0.6, 1.0, 1.6, 2.5, 4.0, 6.3 MPa; Minimum operating pressure: 0.05 MPa; Applicable temperature range: -10~200°C; Applicable media: sewage, slurry, pulp, slag, water, oils, seawater, chemical fluids, etc.; Resistance coefficient: ≤0.2~0.5; Sealing performance: at 1.1 times the operating pressure for a duration of 15 seconds; Leakage rate: ≤0.01XDN (GB/T3927-92 Class B); Peak water hammer pressure: 1.3 times the operating pressure of the pump; Slow opening/closing time: adjustable within 1~60 seconds. VI. Materials of main components: Valve body: carbon steel, stainless steel; Controller: carbon steel, ductile iron; Valve disc: carbon steel, stainless steel; Valve stem: stainless steel; Sealing surface: alloy steel, cemented carbide, stainless steel; O-rings: nitrile rubber, fluororubber. IX. Structural dimensions: Flange dimensions: in accordance with GB/T9113-2000 “Raised face integral steel pipe flanges”, with flange dimensions corresponding to nominal pressures of 1.0, 1.6, 2.5, 4.0, 6.3 MPa respectively ； Structural length: Series 14 of GB/T12221-2005 \"Structural Length of Metal Valves with Flange Connections\". The structural dimension table is as follows: