The valve body of butterfly valve DSF4PB3 is cast in carbon steel or stainless steel, and the surface is treated with anti-corrosion coating to significantly improve corrosion resistance. The butterfly plate is designed as a double eccentric structure, combined with multi-layer metal sealing rings to achieve zero leakage sealing under bidirectional pressure conditions. The valve stem adopts an integral forging process and cooperates with self-lubricating bearings to ensure low-torque opening and closing operations. It can be adapted to manual, electric or pneumatic actuators.

Core technology innovation

1. Triple eccentric sealing technology

The valve seat and butterfly plate sealing surface adopt a beveled cone design. Through the composite structure of geometric eccentricity, axial eccentricity and angular eccentricity, the sealing surface is friction-free during the opening and closing process of the valve, which greatly extends the service life. The pressure resistance level of the metal hard seal structure can reach Class 600, which is especially suitable for high-parameter scenarios such as the main steam pipeline of a power plant.

2. Modular component design

The internal components of the valve are assembled using standardized modules, which supports the rapid replacement of vulnerable parts such as seals and valve stems, significantly reducing maintenance downtime. The valve body flange complies with ISO 5211 standards and can be directly connected to the international mainstream pipeline system.

3. Anti-cavitation optimization

In response to the cavitation problem of the power plant water supply system, the butterfly plate streamline design is optimized through CFD fluid dynamics simulation, reducing the medium flow resistance coefficient to below 0.15, effectively suppressing the occurrence of cavitation.

Typical application scenarios of power plants

1. Cooling water circulation system

In the closed circulating water system, butterfly valve DSF4PB3 maintains the heat exchange efficiency of equipment such as condensers and auxiliary machine coolers through precise flow regulation function, and the regulation accuracy can reach ±5% of the full opening.

2. Flue gas desulfurization system

The valve is lined with special alloy materials (such as Hastelloy C276), which can operate stably in highly corrosive slurry with a pH value of 1.5-2.5, and cooperates with electric actuators to realize automatic control of the slurry flow in the desulfurization tower.

3. Fuel delivery pipelines

In the heavy oil pipelines of coal-fired power plants or the natural gas pressure regulating stations of gas-fired power plants, the fire protection design of the valve (in compliance with API 607 ​​standard) and the electrostatic derivation device can effectively prevent the risk of explosion.

Key points of operation and maintenance management

1. Installation specifications

The clamp-type installation must ensure that the parallelism error of the two flange surfaces is less than 0.5mm, and the bolt tightening follows the principle of diagonal progressive force. The flow direction of the medium should be consistent with the direction marked on the valve body to prevent backflow from impacting the sealing surface.

2. Periodic inspection

It is recommended to perform a sealing performance test every 8000 operating hours and use a helium mass spectrometer leak detector to detect the leakage rate (the standard requirement is ≤1×10^-6 mbar·L/s). Regularly check the preload of the stem seal packing gland to avoid excessive compression leading to increased friction resistance.

3. Fault handling plan

If the opening and closing is stuck, the possibility of insufficient torque of the actuator or crystallization of the medium should be eliminated first. For valves that are in a throttling state for a long time, full-stroke switching operations should be performed every quarter to prevent local wear of the sealing surface.

The butterfly valve DSF4PB3 is a wafer-type butterfly valve designed for industrial fluid control systems. It plays a key role in medium cutoff and flow regulation in power plants. The valve is based on a three-eccentric hard seal structure, combined with high-strength materials and precision manufacturing processes, and can adapt to long-term stable operation under high temperature, high pressure and complex working conditions.

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