The micro-friction slow-closing check valve overcomes the shortcomings of the large resistance coefficient and high power consumption of the swing check valve, thus achieving the goal of energy saving.
The check valve's opening structure consists of three parts: a rotating shaft, a lever, and a valve plate. The main reason for its high resistance coefficient is the significant weight of the lever and valve plate, resulting in substantial head loss and the inability to fully open the valve plate. Particularly, as the flow velocity decreases, the opening degree diminishes. A portion of the head "energy" is consumed in maintaining the opening of the bulky valve plate.
2. The check valve's lever is bent, limiting the valve plate's opening angle to only 65 degrees.
3. The check valve body's irregular shape caused chaotic water flow and increased resistance. To reduce the coefficient of resistance, several design improvements were made as follows.
Firstly, significantly reduce the weight of the valve plate. By replacing the swing check valve with a lightweight, smooth steel core and rubber plate, as well as the valve lever and valve plate, the weight is reduced by 1/3 to 2/3. Consequently, less energy is consumed by the water head to support the valve plate, resulting in a lower flow resistance coefficient and electrical consumption.
Secondly, increase the opening degree of the valve plate. Modify the top of the valve body from flat to arched, raising the valve plate opening to over 85 degrees. As a result, the valve's orifice is larger, the flow resistance coefficient is significantly reduced, and the electrical consumption is necessarily lowered as well.
Thirdly, we have added a level T hammer. By extending the pivot shaft from the valve body, a balancing hammer is attached to its end to counterbalance the weight of the valve plate. Once the balancing hammer is adjusted to a position symmetric to the valve plate, the gravitational force of the balancing hammer keeps the valve plate in an open state. Consequently, this reduces the energy loss of water head, thereby saving energy.
The Butterfly Check Valve is suitable for large-diameter pipelines transporting water or steam, providing check valve function, enabling quick and slow closures, and preventing water hammer impacts. The three eccentric sealing structure ensures zero leakage, with smooth opening actions and low flow resistance. The quick closure section has minimal resistance, while the slow closure section provides smooth buffering without water hammer or impact noise. The three eccentric sealing design with a large secondary eccentric valve plate allows for separation upon opening of the sealing pair and immediate sealing upon closure, reducing seal wear and extending service life.
Butterfly check valves feature a disc that slides along the valve body line. Pipe check valves are a new type of valve with a compact size, light weight, and good machinability, representing one of the directions for the development of check valves. However, their fluid resistance coefficient is slightly higher than that of swing check valves. Pressure-sealed check valves: These valves serve as boiler water and steam cutoff valves, combining the functions of a lift check valve, a gate valve, or a corner valve.
The micro-resistance slow-closing check valve disc slides vertically along the valve body. The internal threaded check valve can only be installed on horizontal pipelines, and a spherical disc can be used on high-pressure small bore check valves. The body shape of the butterfly check valve is the same as that of a stop valve (can be used interchangeably), hence it has a higher fluid resistance coefficient. Its structure is similar to that of a stop valve, with the valve body and disc being the same as those of a stop valve. A guiding sleeve is machined on the upper part of the valve disc and the lower part of the valve cover. The guiding sleeve of the valve disc can rise and fall freely within the guiding sleeve of the valve cover. When the medium flows in the forward direction, the valve disc opens with the thrust of the medium. When the medium stops flowing, the valve disc drops by itself onto the seat, preventing the reverse flow of the medium.
The Butterfly Check Valves are primarily used in industrial water supply and wastewater treatment plant pump outlets to prevent backflow of medium in the pipeline, automatically destroying destructive water hammer, thereby protecting the pump and pipeline from damage. The Butterfly Buffer Check Valves are mainly composed of the valve body, valve disc, buffer device, and微量调节阀. The Butterfly Buffer Check Valves feature a novel structure, small size, low fluid resistance, smooth operation, tight sealing, and excellent buffering performance. The H47X, HH47X, HH47H, H47XF, and HDH47X models of Butterfly Buffer Check Valves are the best products for industrial water use and urban sewage discharge.
The butterfly check valve requires both ends of the valve passage to be sealed in a dry, ventilated room. If stored for a long period, it should be checked regularly for rust prevention. Before installation, the valve should be thoroughly cleaned and any defects caused during transportation should be addressed. During installation, carefully verify that the markings and labels on the valve meet the usage requirements. This valve is installed on horizontal pipelines with the valve cover facing upwards.
Butterfly check valves are categorized into swing check valves and lift check valves based on the valve disc's movement. The butterfly check valve allows fluid to flow through the pipeline in only one direction, and the valve disc can only open in one direction. When the medium in the pipeline is stationary and no flow occurs, the valve disc is closed due to the combined action of the spring pressure and its own weight. When the medium in the pipeline flows in the correct direction, the flowing medium exerts a thrust, opening the valve and allowing the medium to pass through the butterfly check valve. When the medium in the pipeline reverses, the recirculating medium generates a reverse thrust on the valve disc, working in conjunction with the valve disc's weight. In this case, the valve disc tightly seals against the sealing surface, preventing the occurrence of reverse flow.
The butterfly check valve features a high-pressure, small-bore design with a round valve disc. During installation, it is crucial to ensure that the flow direction of the medium aligns with the arrow direction on the valve body. This valve should be installed horizontally on the pipeline; the valve body cannot bear the pipeline weight, so additional support is required for large-bore valves. Before installation, carefully check the parameters on the nameplate to ensure they meet the pipeline's operational requirements. Storage method: The valve should be stored in a dry, well-ventilated room. During storage, the moving parts should be in the open position, and the passage should be sealed tightly with a cover, along with rust prevention measures. For long-term storage, regularly inspect the sealing surfaces and other areas, remove dirt and dust, and apply new rust-proof oil.
The Butterfly Check Valve primarily controls the flow direction of the medium within the pipeline, thereby preventing backflow of the medium in the pipeline, the release of container medium, and the normal回流 of the medium. The Butterfly Check Valve boasts simple structure, compact size, and low resistance loss, playing a very crucial role in fluid process systems. The Single Plate Butterfly Check Valve is a type of Butterfly Check Valve, whose design concept and advantages make it widely applicable. This article provides an overview of the Single Plate Butterfly Check Valve, and also discusses its working principle, the design and calculation of the main components and structure, as well as its structural characteristics.
