Working condition
| Pressure Rating | CLASS150 ~ CLASS600 |
| Nominal Size | NPS ½"–8" (DN 15–DN 200) |
| Internal Leakage Standard | API 598 / FCI 70-2 Class VI |
| Applicable Media | solid catalyst |
| Operating Temperature | up to 550℃ |
| Frequency | up to 160,000 times per year |
Pain Points and Proposal
1. External leakage at packing:
High-frequency cycling causes rapid packing wear → insufficient sealing specific pressure → external leakage.
2. Internal leakage:
Solid particles entering compensation structure during cycling → spring chamber clogged/spring failure → loss of preset force compensation → internal leakage.
3. Valve jamming:
High-frequency cycling accelerates shaft wear (external leakage) + stem/bushing scoring → torque surge → potential jamming.
4. Actuator failure:
High-frequency cycling → accelerated shaft wear (external leakage) → may induce jamming.
1. Live-load packing design:
Multi-layer packing effectively prevents external leakage from frequent cycling. Spring-loaded composite packing (dynamic-load plate) meets EPA standards with TA-LUFT & ISO 15848 certification.
2. New track design:
Disc trajectory-based track ensures full-disc guidance (not just substrate clearance), preventing metal galling. Maintains disc rotation during operation → extended service life.
3. Hardened moving components:
High-speed/frequency operation necessitates extensive hardening. Antewei employs proven hardening methods/materials for all moving parts through rigorous testing.
Reference
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Zhongke(Guangdong) Refinery&Petrochemical - DD Model Rotating Disc Valve
Process: Continuous Reforming
Size: DN100
Pressure Rate: CLASS300lb
Temperature: 500-550°C
Fluid: Catalyst
Raw material: A105
On-off Frequency: 32,000 times per year