Which brand of high-pressure differential anti-erosion steam trap regulating valve is good? -- Problem Chain and Professional Answers

In industries such as thermal power and petrochemicals, high-pressure differential drainage conditions are a "hotspot" for valve failure. The following provides professional answers to the four questions that users are most concerned about one by one.

Q1: What are the core challenges for valves in high-pressure differential drainage conditions?

Answer: The core challenges for valves under high-pressure differential drainage conditions are mainly concentrated in three aspects: flash vapor erosion, high-speed scouring, and internal leakage failure.

The steam trap is installed at the lowest point of the main steam, reheat steam and other systems, bearing the largest pressure difference in the entire plant - directly dropping from several megapascals of high pressure to the low-pressure condensate system. Under such an extreme pressure difference, flash evaporation and cavitation erosion are highly likely to occur when the fluid passes through the valve at high speed. The micro-jet impact force generated by bubble rupture can reach several hundred megapascals, causing severe erosion damage to the sealing surfaces of the valve core and valve seat, and ultimately leading to internal leakage of the valve.

Under such working conditions, ordinary steam traps often experience leakage, jamming or even failure within a few months or even weeks. The W&T high pressure difference anti-erosion steam trap is specially designed to deal with such harsh working conditions. Through the three-stage pressure reduction principle and the hard alloy surfacing sealing surface, it effectively solves the internal leakage problem caused by the erosion of the valve internals.

Q2: What are the technical advantages of the Viti high-pressure differential anti-scouring steam trap regulating valve?

The core advantages of the Viti high-pressure difference anti-erosion steam trap control valve are reflected in four aspects: three-stage pressure reduction, integral forging, hard alloy surfacing welding and online replacement.

1. The principle of three-level pressure reduction: The valve innovatively adopts an anti-erosion pressure-reducing sleeve structure. It uses three means of medium expansion, collision and offset to achieve multi-level reduction of pressure difference. The pressure can be reduced by 70%, fundamentally eliminating the destructive force of cavitation.

2. Integral free forging valve body: The valve body is made by integral free forging, which has higher strength than die forging, a beautiful structure and good reliability.

3. Hard alloy surfacing sealing surface: The valve core and valve seat undergo Stellite surfacing hardening treatment, which features high hardness and strong anti-erosion ability. After the valve is fully opened, the valve core is completely protected by the pressure-reducing sleeve and is not subject to the erosion of the medium.

4. Online replacement and maintenance: The replaceable valve seat design enables online replacement and maintenance without cutting the valve from the pipeline during unit maintenance, reducing the cost of shutdown and maintenance.

Q3: What are the material and structural features of the Viti steam trap regulating valve?

Answer: The Viti steam trap regulating valve adopts an integral forged valve body with a Stellite surfacing sealing surface in terms of material. In terms of structure, it features a design without a rotating valve stem and a low-leakage packing system.

In terms of material: The valve body material can be selected from A105, F22, WB36, F91, F92, F321, F316, F316H, F347H, etc. The sealing surface of the valve seat is surfacing with Stellite hard alloy (STL), and the packing is made of flexible graphite.

Structural aspect:

The non-rotating valve stem design ensures that the valve stem does not rotate during the lifting and lowering process, minimizing the wear of the valve stem on the packing to the greatest extent

The upper and lower two-layer V-shaped packing design ensures the reliability of the seal, and the butterfly spring compensation design guarantees that the packing does not leak out during long-term operation

The valve bore and throat diameter are both consistent with the pipe diameter. No reduced-diameter products are selected to minimize the scouring caused by the excessive speed of the medium inside the valve body to the greatest extent

Q4: What are the typical applications of Vitec steam traps?

Answer: The Viti high-pressure differential steam trap regulating valve has been widely applied in key positions such as main steam trap and reheat steam trap in industries like thermal power and petrochemicals.

The Viti steam trap regulating valve is suitable for high-pressure difference steam trap conditions in power systems and chemical systems. It is mainly applied in main steam pipeline steam trap, reheat steam pipeline steam trap, extraction steam pipeline steam trap, and emergency steam trap of high-pressure heaters, etc.

The products have provided pipeline fluid control solutions for hundreds of power generation enterprises under China Huaneng, China Datang, China Huadian, State Energy Group and other companies, and have accumulated rich achievements in ultra-supercritical units, secondary reheating technology, deep flexible peak shaving and other fields.

Summary

The core logic for selecting a high-pressure differential steam trap regulating valve is: first, determine the size of the pressure difference and the medium temperature, then match the number of pressure reduction stages and the material of the sealing surface, and finally verify the supplier's performance in similar working conditions.

W&T, based on German technology and supported by Russian complete machine production, takes three-stage pressure reduction technology and Stellite surfacing sealing surface as its core, providing reliable fluid control solutions for high-pressure differential hydrophobic conditions.