اللغة العربية
تحليل موجز للمشاكل الموجودة في تشغيل صمامات التحكم تحت ظروف العمل المعقدة
تم إنشاؤها 10.10
[Overview Description] When control valves operate under complex working conditions, they are prone to severe issues such as corrosion, cavitation, erosion, blockage/jamming, and scratching. These problems can cause significant damage to the sealing surfaces of control valves, leading to unreliable sealing and short sealing lifespans. This has remained an unresolved challenge for domestic control valves over the past few decades. After the development of the fully functional ultra-lightweight control valve, which addressed issues of bulkiness and incomplete functionality, we have now focused our efforts on overcoming the sealing challenges under complex working conditions.
I. Definition of Complex Working Conditions and Associated Problems
- High Pressure and Large Pressure Differential: These conditions can cause severe erosion or cavitation, affecting the sealing lifespan.
- High Temperature and Large Temperature Differential: Significant thermal expansion and contraction can alter the fit properties assembled at room temperature, leading to leakage. In severe cases, blockage/jamming can occur, making valve operation difficult or even causing the valve to become "stuck."
- Unclean Media: Contaminants in the media can cause severe erosion, blockage/jamming, and scratching of the valve core and seat, affecting valve operation and sealing.
- Corrosive Media: Corrosive substances can cause corrosion damage to the materials in contact.
- Class VI Hard Seal Shut-off: Especially under large pressure differentials, the valve core and seat must close tightly. During the instant of opening, friction on the sealing surfaces can cause scratching.
In summary: Under the harsh working conditions mentioned above, including severe cavitation, erosion, corrosion, expansion/contraction, blockage/jamming, and scratching, achieving Class VI hard seal shut-off is even more challenging. This has remained an unresolved challenge for domestic control valves over the past few decades.
II. Reliability Analysis of Traditional Sealing Structures
- Soft Seal vs. Soft Seal: The soft material is easy to seal but has extremely poor reliability due to its softness.
- Soft Seal vs. Stainless Steel: Slightly better than (1), but sealing remains unreliable.
- Stainless Steel vs. Stainless Steel: Slightly better than (2), but the hardness of stainless steel is still low (HRC 20-25), and sealing remains unreliable.
- Multi-layer Seal Valve Seat: Overlapping use of stainless steel thin plates and soft materials provides sealing reliability similar to (2) and (3), but with improved temperature resistance.
- Hardfacing Wear-resistant Alloy: Typically, STELLITE alloy is hardfaced, which is currently a relatively good sealing material. However, its hardness is still not high (HRC 40-45) and does not adequately meet the stringent conditions of complex working conditions.
- Ceramic Seal: While ceramic has extremely high hardness, it lacks toughness and is prone to brittle fracture, sometimes even cracking before use.
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