Model：GPQDS848H-P

First. Product introduction and use

1. The background of technology development

In the industrial and mining, municipal water supply, sewage treatment and industrial process cooling and circulating water supply equipment, the multiple valve systems, such as check valves, cut-off valves and water hammer eliminator, are commonly used to meet the specific requirements of the starting and closing of the water pump, so as to achieve the purpose of light load starting and eliminating water hammer. However, there are problems such as short life, large resistance, high energy consumption, difficult manufacturing of large diameter, large space occupation, especially labor intensity. With the development of science and technology, the water pump control valve controlled by hydraulic system, multi-function pump control valve, liquid controlled hemisphere butterfly valve, tube force valve and other control valves have appeared gradually. The emergence of these valves to a certain extent promote the development of pump control technology, but with the development of industry and the progress of the times, the defects of these pump control valves are gradually displayed. For example, some valves need external energy, complex structure, difficult maintenance, some flow resistance coefficient is large, some volume is large, it is not conducive to the manufacture of large caliber valves. The most important problem is that the automatic control part is driven directly by the medium conveyed in the tube, and the control part is blocked and corroded and the maintenance is difficult and the maintenance is difficult. The range is narrow.

This product is a new type of pump control valve series products. It fully utilizes the medium pressure of pipeline itself to be converted into hydraulic energy to realize the requirements of slow opening, fast opening, fast closing and closing of the control valve, which not only satisfies the requirements of automatic water control, but also overcomes the difficulty of blocking in the bad conditions such as slag slurry, sewage water and mud. The problem of easy corrosion in seawater and other corrosive media has overcome many disadvantages of the current pump outlet valve, and conforms to the development trend of automatic, energy saving and environmental protection of the valve.

2, function, use

The automatic double control hemispherical valve is installed in the slurry pump, slurry pump, sewage pump, mud pump, and water pump outlet. It is mainly used in electric power, metallurgy, mine, petrochemical, medicine, sewage treatment, sea water transportation, urban water supply and drainage and other industries. It not only eliminates water hammer, but also has small resistance, energy saving and low comprehensive cost.

Two. The main features and advantages

1. Automatic double control hemisphere valve is the fifth generation of new pump control valve developed by our company. The control structure is the first in the world. This product not only has all the functions of the first four generation pump control valves, but also expands the use range of the pump control valve, and overcomes the defects of the previous control valves, such as the non action of the control valves caused by the water quality problems, the easy damage of the diaphragm and the easy death of the piston cylinder.

2, the valve slowly open and slow down control device is controlled by the hydraulic controller independently, without any external side energy pipeline, the controller is hydraulic oil, and the medium is not related to the medium in the pipe. The valve can be used for any pump exit conditions.

3. The driving force of the valve opening and closing is taken from the pressure energy of the medium in the pipe. The controller takes advantage of the pressure difference before and after the valve, and does not need external power source. When the pump opens and stops, the valve automatically acts according to the regular movement of the pump, without manual, electric, pneumatic and hydraulic force and so on. Opening, quick opening, quick closing, slow closing effect, safe and reliable operation.

4. The flow area is large, the valve plate cross-sectional area is small, and the running resistance of the control valve is 70% smaller than that of the ordinary pump control valve, and the energy saving effect is obvious. The resistance coefficient of this valve is 0.2~0.5, and the resistance coefficient is related to the size of energy consumption, that is, the operation cost that people often say.

5. The sealing surface of the valve body is a conical surface, and the sealing surface of the valve plate is a spherical surface. The sealing surface is made of stainless steel or hard alloy. The sealing surface is hard seal and the sealing property is line seal, so the sealing surface has small reclosing area, and the seal is larger than the pressure. It is a hard metal seal with zero and hard hitting. The valve plate can cut, crush, and arrange various filamentous, granular suspended and semi suspended impurities. It can be effectively crushed and removed. Because this product uses three eccentric structure, the spherical valve plate can automatically correct the center and automatically compensate for the wear of various sealing surfaces, so the service life of the valve is much longer than that of the same kind.

6, this product is not affected by the media, it can be used in the complex conditions of clean water pump, slurry pump, sewage pump, mud pump and so on. It is also suitable for corrosive media such as seawater.

Five. Technical parameters：

Nominal diameter: DN80-4000mm nominal pressure: 0.6, 1, 1.6, 2.5, 4, 6.3Mpa

Minimum action pressure: 0.05MPa applicable temperature: -10~200 C

Applicable medium: sewage, mud, pulp, pulp, water, oil, sea water, chemical fluid, etc.

Resistance coefficient: less than 0.2~0.5 sealing performance: working pressure 1.1 times, duration 15S

Leakage: less than 0.01XDN (GB/T3927-92B)

Peak value of water hammer: 1.3 times water pump working pressure slow open, slow closing time: 1~60S adjustment

Six. The material of the main parts：

Valve body: carbon steel and stainless steel controller: carbon steel and ductile iron.

Valve plate: carbon steel and stainless steel stem: stainless steel.

Sealing surface: alloy steel, hard alloy, stainless steel

O ring: butadiene rubber and fluoro rubber