Year1
- DN：
- 150
- DN：
- 175
- DN：
- 250
< The empty discharge check valve is installed on the outlet pipe of the high-pressure feed pump of the thermal power unit to prevent the backflow of feed water and protect the feed water pump. This valve works in conjunction with the minimum flow automatic recirculation bypass valve of the water pump. When the feed water pump is under low load or the outlet door is closed, the automatic recirculation bypass valve should be in the open position to ensure the safe operation of the water pump.
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< Detailed information of empty discharge check valve:
< 1. Overview of the empty discharge check valve
The empty discharge check valve is installed on the outlet pipe of the high-pressure feed pump of the thermal power unit to prevent the backflow of the feed water and protect the feed water pump. This valve works in conjunction with the minimum flow automatic recirculation bypass valve of the water pump. When the feed water pump is under low load or the outlet door is closed, the automatic recirculation bypass valve should be in the open position to ensure the safe operation of the water pump. When the empty discharge check valve opens, the recirculation bypass valve automatically closes. It is not suitable for media containing solid particles and high viscosity.
2. Structural characteristics of empty discharge check valve
Working principle: Open the outlet valve, start the water supply pump, and after the water supply reaches a certain pressure, the valve disc rises to a certain height under the action of the water supply pressure, pushing Leaving the valve seat, the feed water flows out. At the same time, due to the rise of the valve disc, the connecting rod is driven to rotate and the exhaust port valve plate is moved, causing the recirculation blade valve to move downward and close the exhaust port. When the feed water flow decreases, the valve disc falls, pushing the connecting rod to open the evacuation valve disc, and opening the recirculation door to maintain the minimum allowable flow rate of the water pump. When the pump is stopped, the valve disc automatically falls and closes the valve channel to prevent damage to the high-pressure water hammer water supply system.
Structural features: This valve works in conjunction with the recirculation bypass valve to maintain the safe operation of the system. The main valve disc moves up and down. When the medium flows backward, the channel is closed with the help of medium pressure and spring action. At this time, the bypass valve opens. When the main valve disc is fully open, the bypass valve closes. The valve disc seal is made of stainless steel surfacing, which has strong wear resistance, scratch resistance and reliable sealing. The valve should be installed vertically.
3. Materials of main parts of empty discharge check valve
< Valve body, Connecting flange, exhaust flange, flange cover
< Carbon cast steel
< Guide shaft, pull fork, bushing, slider, Discharge sleeve, exhaust plate
< Stainless steel
< Valve disc, valve disc body, valve disc shaft, connecting fork
< High quality carbon steel
< Bushing
< Stainless steel
< Bolts, nuts
< High-quality carbon steel
4. Main connection dimensions of empty discharge check valvebr> <
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< > Company Profile: br>
Yongjia County Dongou Shuanghua Valve Factory is located in the scenic Dongou Industrial Park of Wenzhou, the hometown of pumps and valves in China. Our factory has two valve production bases in Wenzhou and Yunhe. We have strong technical force, scientific and reasonable management, and advanced and sophisticated equipment. It has a modern quality inspection and testing center, a valve design center, as well as modern equipment and testing methods such as heat treatment chemical analysis, spectral analysis, mechanical performance testing, R-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, plasma spray welding and large and medium-sized valve test benches. The company implements various quality system standards throughout the entire process of enterprise production and operation. It has strong design, development and annual production capacity of tons of valves. The company always relies on technological innovation, strives to improve product quality, and constantly improves high-temperature and high-pressure valves. While producing power station valves, American standard series valves and general valves, we also rely on our strong technical strength to continuously develop new products. Products are designed and manufactured using B, B,,, B,, and other standards. The driving modes include manual, electric, pneumatic, hydraulic, electro-hydraulic linkage and spur and bevel gear transmission. The nominal diameter ranges from bb, the nominal pressure ranges from bb, the operating temperature ranges from ℃ to ℃, and various non-standard valves can be designed and produced according to customer requirements. The company's products are widely used in various large, medium and small hydropower, thermal power plants and other power systems as well as petroleum, chemical, metallurgy, machinery, mining, papermaking, pharmaceutical and other industries, and have won a high reputation for their excellent quality and excellent and complete after-sales service system. Users have praised the products, and the products sell well in the domestic market and are exported to Southeast Asia, Eastern Europe, the Middle East and other countries and regions.
The company adheres to the business philosophy of benefiting customers and serving the market. Let us work together to create a better future!
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