Hydropower station type hydraulic control slow closing ball valve product introduction
Hydraulic control slow closing ball valve is the most advanced pipeline control equipment at home and abroad. It is mainly installed at the inlet of the turbine of the hydropower station and used as the inlet valve of the turbine; Function of return valve and gate valve. When working, the valve cooperates with the main engine of the pipeline, according to the principle of the hydraulic transition process, through the preset opening and closing procedures, the water hammer of the pipeline is effectively eliminated, the reliable cut-off of the pipeline is realized, and the safety of the pipeline system is protected.
The hydraulically controlled slow-closing ball valve produced by our company has a small flow resistance coefficient, a high degree of automation, complete functions, and stable and reliable performance. On the basis of extensive collection, research and summary of the performance of similar products at home and abroad, our company’s designers have introduced valves, hydraulic pressure A number of research results in the electrical and other industries have accumulated and developed a new generation of intelligent, high-efficiency and energy-saving products. The company has strong technical force, and can design it independently according to the special requirements of users, so as to meet the needs of users for this type of products in many ways.
This product mainly has the following characteristics:
1. It can replace the functions of the original electric gate valve and check valve at the pump outlet, and integrate the mechanical, electrical and hydraulic systems into a whole, reducing the floor space and infrastructure investment.
2. The electro-hydraulic control function is complete, and it can be used as an independent system for local debugging and control without additional configuration; it can also be used as an equipment unit of the distributed control system (DCS), which is centralized by the central computer through the I/O channel. It can realize linkage operation with water pump, water turbine, bypass valve and other pipeline equipment; it is also equipped with manual function, which can open and close the valve manually when there is no power supply, so as to meet the valve debugging and control requirements under special working conditions.
3. Good controllability, large adjustment range and strong adaptability. The electro-hydraulic control system has multiple adjustment points, and the opening and closing procedures can be set according to different pipeline control requirements to ensure that the valve can automatically open and close quickly according to the preset time and angle when the valve opening and closing conditions are met. , two stages of slow closing. And it can realize non-electric closing valve, effectively eliminate destructive water hammer, prevent the occurrence of runaway accidents of pumps and hydraulic turbine units, reduce the pressure fluctuation of the pipe network system, and ensure the safe and reliable operation of equipment.
4. The sealing surface of the main valve is a triple eccentric metal seal or a double eccentric rubber sealing structure, which is easy to open and close, and has a reliable seal; and there is an additional enlarged eccentric, which makes the valve have good self-closing and self-sealing performance. The medium and small diameter ball plates are designed as a streamlined plate structure, and the large diameter ball plates are designed as a double plate truss structure, with small displacement and smooth water flow. The flow resistance coefficient of the valve is only 0.1~0.6, which is much smaller than that of the check valve (1.7～2.6), the energy saving effect is obvious
Standard and specification for hydraulically controlled slow-closing ball valve for hydropower station
| Product’s Standards | GB/T 14478、GB/T 12238、JB/T 8527 | |
| Drive Device | JB/T 5299 | |
| Constructure Length | GB/T 12221 | |
| Flange | Gray Cast Flange | GB/T 17241.6 |
| Spheroidal Cast Iron Flange | GB/T 12380.1~12380.3 | |
| Steel Flange | GB/T 9112~9131 | |
| Accumulator | GB/T 2352 | |
| Test | GB/T 14478、GB/T 13927 | |
| Quality Guarantee | ISO9001 | |
Note: Other relevant standards and foreign standards can be used, and the flange size can be manufactured according to user requirements, but it should be stated in the order contract.
Basic parameters of hydraulically controlled slow-closing ball valve for hydropower station
| Nominal Diameter DN（mm） | 150~2400 | |
| Nominal Pressure PN（MPa） | 0.25~4.0 | |
| Test Pressure Ps（MPa） |
Sealing | 1．1×PN |
| Strength | 1．5×PN | |
| Working Pressure （MPa） | 1．0×PN | |
| Applied Temperature （℃） | ≤80 | |
| Applied Medium | Water, Sea Water, Water include Plaster and Sand, Oil | |
Note: 1. 1Mpa=10.2㎏f/c㎡ 2. When used in hydropower stations, the sealing test pressure can be calculated according to the highest hydrostatic head of the power station.
Special parameters of hydraulically controlled slow-closing ball valve for hydropower station
| Item | Adjusting Range | Parameters for leaving the factory | |
| Opening time(Adjustable) | 15~60秒 | 30 | |
| closing time(Adjustable) | Fast close | 5~25 | 8 |
| Slow close | 8~60 | 20 | |
| closing angle(Adjustable) | Fast close | 70±10° | 70 |
| Slow close | 20±10° | 20 | |
| Minimum flow resistance coefficient | 0.1 | ||
Material selection for main parts of hydropower station type hydraulically controlled slow-closing ball valve
| Name | Material |
| Body | Gray Cast Iron、Spheroidal Cast Iron、Carbon Steel |
| Disc | Gray Cast Iron、Spheroidal Cast Iron、Carbon Steel |
| Shaft | Stainless Steel、Carbon Steel |
| Body Sealing Ring RingRin | Copper Alloy、Stainless Steel |
| Disc Sealing Ring | High Quality NBR、Stainless Steel/Soft graphite |
| Transmission Shaft | Copper Alloy |
| Packing | V- Sealing Ring、Soft graphite |
| Wallboard | Carbon Steel |
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