Working condition
| Pressure Rating | CLASS 300 ~ CLASS 900 |
| Nominal Diameter | NPS 8 ~ NPS 24 |
| Internal Leakage Standard | ANSI FCI 70-2 CLASS VI |
| Applicable Medium | coal powder, slug water, fly ash |
| Operating Temperature | ambient ~ 705°C |
| Operation Method | Pneumatic |
Pain Points and Proposal
1. Erosion:
Hard fluid erosion damages sealing surfaces.
2. Abrasive:
Solid particles can enter and damage the sealing surfaces.
3. Jamming:
Solid particles accumulate inside valve pocket, increase valve operating torque, resulting valve jamming and even cannot be operated.
Erosion & Wear Resistance (Key to long service life under severe conditions)
● Solid sintered Carbide Disc & Seat:
Engineered with solid sintered carbide
construction for exceptional erosion resistance, high hardness (≥85 HRA),
and superior corrosion protection.
● Hardened Flow Path:
Features either flame-sprayed hardening or full carbide liner for sustained integrity.
● Self-rotating and self milling trim:
Rotating mechanism continuously mills sealing surfaces a good compensating for wear.
● Scraper design:
Scraper design prevents particle entering sealing surface.
● Sliding Motion:
Disc is parallel to seat, eliminating high-impact erosion from sudden flow re-direction.
Preventing Buildup Prevents Jams
● Open valve pocket Design: Maximizes media flow-through.
● Standard Purge port design:
End user can design purging system to avid solid medium accumulation by purge port.
Reference
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Yuntianhua Yunnan Dawei Ammonia Co.,LTD. - Rotating Twin Discs Valve for Coal Powder Lock Hopper
Process: Shell SCGP Gasification
Size: DN300
Pressure Rating: CLASS 600lb
Fluid: Dense Phase Coal Powder with Nitrogen or Carbon Dioxide
Temperature: 80-120°C
Raw material: WCB
On-off Frequency: 16,000-24,000 times per year