Bellows Valve (VAT SERIES 64)

Description

1. Product Overview

The VAT SERIES 64 Bellows Valve is a high-cycle, high-purity isolation valve engineered for extreme vacuum and corrosive gas management in semiconductor and thin-film deposition processes. Its primary industrial use lies in controlling aggressive media and maintaining ultra-high vacuum (UHV) conditions in tool chambers, where standard diaphragm or gate valves fail due to particulate generation or seal fatigue. The key value proposition is its proven >1.5 million maintenance-free cycles with near-zero particle emission, driven by a precision-welded stainless steel bellows that eliminates dynamic elastomer wear. Strategically, this valve is critical for fabs and research institutions seeking to reduce unplanned downtime, lower cost of ownership, and achieve repeatable process yields in 7nm and below nodes.

2. Key Specifications & Technical Characteristics

• Chemical composition / Material components:
  Valve body: 316L stainless steel (electropolished, Ra ≤ 0.25 µm); Bellows: AM-350 precipitation-hardened stainless steel; Seal: Viton® / FKM (optional Kalrez® for plasma resistance); Actuator: Hard anodized aluminum alloy.

• Purity level / Grade:
  Semiconductor-grade, UHV compatible (leak rate < 1×10⁻⁹ mbar·L/s); Helium leak tested to ≤ 5×10⁻¹⁰ atm·cc/s.

• Physical characteristics:
  Form: Inline bellows shut-off valve, pneumatically actuated (normally closed or open).
  Connection: ISO-KF, ISO-F, CF-F, or custom flanges.
  Temperature range: Actuator: +5°C to +60°C; Body (baked): up to 200°C (CF version).
  Pressure range: 1×10⁻⁹ mbar to 2 bar (absolute).

• Packaging options:
  Class 100 (ISO 5) cleanroom double-bagged, vacuum-sealed with particle count certificate. Individual or modular palletized trays for OEM tool builders.

• Shelf life:
  Unlimited if stored in original packaging at 10–30°C, <80% RH; elastomer seals replaceable every 2 years under normal service.

3. Core Industrial Applications

• Primary industries: Semiconductor front-end (etch, CVD, ALD, PVD), photovoltaic cell manufacturing, flat panel display, research synchrotrons, and high-energy physics.

• Specific use cases:

  • Load lock isolation in cluster tools to prevent backside deposition.

  • Corrosive gas abatement lines (Cl₂, BCl₃, HF, NF₃).

  • Pumping line isolation for turbo molecular pumps under vibration.

• Why superior vs alternatives: Unlike diaphragm valves (which rupture under thermal cycling) or gate valves (which generate particles from sliding metal contact), the VAT SERIES 64 uses a non-contacting bellows seal. This yields >10x longer maintenance intervals and reduces defect density by up to 40% in sensitive gate oxide layers. Its compact in-line design also saves tool footprint while enabling rapid actuation (≤50 ms).

• Efficiency & cost advantage: Lower helium purging requirements (less wasted gas) and predictable rebuilds every 18-24 months vs 3-6 months for elastomeric valves — reducing annual valve-related downtime from 12 hours to under 2 hours per tool.

4. Competitive Advantages

• Quality consistency: Every valve undergoes 100% leak testing, bellows stroke cycle validation (5,000 cycles before shipment), and particle count verification (<5 particles ≥0.1 µm per valve). VAT’s in-house statistical process control exceeds SEMI S2/S8 standards.

• Supply reliability: Global stock hubs (EU, NA, APAC) with 48-hour dispatch for standard configurations. Backup bellows kits available for emergency field replacement.

• Logistics capability: Shock- and vibration-validated packaging (ISTA 3A) with real-time GPS tracking on bulk orders.

• Price competitiveness: Lower total cost of ownership (TCO) than Edwards or MKS equivalents — typically 22% lower over 3 years when factoring in reduced rebuilds and wafer scrap.

• Sustainability & compliance: RoHS, REACH, and Conflict Mineral compliant. Bellows are 100% recyclable; valve body designed for end-of-life material separation.

• Technical support: VAT provides factory-trained field application engineers, 3D CAD models (STEP/IGES), detailed installation & maintenance video library, and 24/7 remote troubleshooting hotline for global fabs.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 5 units for standard configurations (ISO-KF, DN40–100); 1 unit for CF-flange high-temperature variants (subject to surcharge).

• BULK 20MT Loading capacity: Not applicable (valve weight ~2.5–8 kg per unit). Equivalent bulk order: Up to 1,200 units of DN50 ISO-KF valves per 20’ container (approx. 3.6 MT total, using palletized stackable crates). Full container load recommended for OEM tool builders to optimize freight cost per unit.