- Water, Air, Gas, Oil, sTEAM
- metal seal butterfly valve
- DN50~DN4000
- 1.0~2.5MPa
- Manual, electric, pneumatic, bevel gear
- Water, steam, gas, oil, etc
- QT450WCB, CF8
Specification
Telescopic Double Eccentric butterfly Valve Bidirectional Sealing Metal 4 Inch Double Offset butterfly Valve
Advanced Metallurgy
High-Temp Toughness: Ultra-low S/P CF8M bodies solution-annealed at 1100°C + cryo-treated (-196°C CVN ≥80J per ASTM A370).
Intergranular Corrosion Resistance: 0.15-0.25% nitrogen addition passes ASTM A262 Practice E.
Core Processes
Investment Casting:
Silica sol molds, Ra≤125μin finish, 100% RT per ASTM E192.
Seal Surface Enhancement:
Robotic PTA overlay (≤3HRC gradient) + diamond-ground to Ra≤4μin (flatness ≤0.0004″/in).
Bellows Fabrication:
Electro-polished (Ra≤16μin) with 2nm passive layer; ISO 15848-1 BH certified.
Extreme Validation Protocol
|
Test |
Standard |
Condition |
Acceptance |
|
Thermal Cycling |
API 607 Annex B |
30x 600°C↔25°C shocks |
No seal cracking |
|
Telescopic Fatigue |
EJMA Section 9 |
10k cycles ±15mm |
Zero leakage |
|
Bidirectional Sealing |
ISO 5208 |
42MPa hydro / 6.9MPa pneum |
Rate A zero visible |
|
Torque Consistency |
MSS SP-67 |
100k cycles |
≤±5% variation |
Performance Leadership: Redefining High-Temp Reliability
|
Parameter |
Newway Valve |
Conventional Competitor |
|
Thermal Compensation |
±15mm + ±3° |
Requires expansion joints |
|
Seal Life |
≥250k cycles @600°C |
≤80k cycles @300°C |
|
Operating Torque |
180Nm (DN600) |
450Nm+ (DN600) |
|
Maintenance Interval |
10 years (in-situ seal) |
3 years (full removal) |
|
System Cost Savings |
30% (eliminates joints) |
Additional compensators |
Product Overview
Newway Telescopic Double-Offset Bidirectional Metal-Seated Butterfly Valve: Dynamic Compensation Solution for High-Temperature Pipelines
In complex piping systems for petrochemical and power generation applications, thermal displacement compensation and zero-leakage sealing are critical operational challenges. Newway’s telescopic double-offset bidirectional metal-seated butterfly valve integrates dynamic expansion joints, dual-eccentric geometry, and multi-layer metal sealing to resolve stress deformation, seal failure, and maintenance downtime in high-temperature/pressure environments—redefining safety in modern industrial flow control.
Core Innovation: Thermal Self-Adaptation & Bidirectional Sealing
Engineered for extreme service (≤600°C / Class 600), this valve overcomes rigid structural limitations:
Axial Compensation: Stainless bellows absorb ±15mm axial displacement and ±3° angular deflection, eliminating flange bolt shear stress.
Bidirectional Pressure Integrity: Multi-layer seal stacks achieve ≤10⁻⁶ mbar·L/s helium leakage (per ISO 5208 Rate A) regardless of flow direction.
Breakthrough Engineering: Geometry Meets Material Science
1. Telescopic Bellows System
Hydraulic-Formed Layers: 100+ plies of 0.15mm 316L strip (≥20,000 cycles per EJMA).
Dynamic Stem Seal: Laser-welded bellows with high-temp grease (-40°C to 450°C) replace packing glands for zero fugitive emissions.
2. Double-Offset Geometry
Offset 1: Stem behind disc centerline reduces friction 85% during unseating.
Offset 2: 8° stem-to-pipe angle enables progressive metal contact (wear rate ≤0.005mm/10k cycles).
3. Bidirectional Metal Sealing
Disc: ASTM A995 4A duplex substrate with PTA-overlaid Stellite 6 (2.2±0.1mm; HRC 45-48).
Self-Compensating Seat: 12-disc spring stacks absorb 1.5mm wear while maintaining sealing stress.