What is a UHV Gate Valve?
A UHV gate valve is a specialized valve designed to isolate sections of a vacuum system operating at pressures typically below 10^-9 mbar. Unlike conventional valves, UHV gate valves ensure ultra-tight sealing and minimal particle generation, critical for maintaining vacuum purity and preventing contamination.
They operate by sliding a gate or plate into the flow path to open or close the vacuum passage. The valve must withstand bake-out temperatures up to 250°C, maintain leak rates as low as 10^-10 mbar·L/s, and provide reliable operation over tens of thousands of cycles.
Key Features of UHV Gate Valves
Leading UHV gate valves, such as the VAT 10.8 Ultra High Vacuum Gate Valve, incorporate advanced technologies and robust designs that set industry benchmarks:
VAT Lock Technology: A mechanical lock-in mechanism that prevents valve failures by securely locking the gate in the closed position, ensuring frictionless sealing and fail-safe operation.
Lubricant-Free Design: Eliminates contamination risks and allows bake-out temperatures up to 250°C, crucial for ultra-high vacuum applications.
Robust Stainless Steel Construction: Typically made from AISI 304 or AISI 316L stainless steel, providing corrosion resistance and mechanical strength.
Welded Metal Bellows Feedthrough: Ensures hermetic sealing of the valve stem, preventing leaks and extending service life.
Vulcanized Seals: Preferred over O-rings for superior vacuum performance and reliability, especially in sizes up to DN 200 mm.
Benefits of Using a UHV Gate Valve
Choosing a high-quality UHV gate valve brings numerous advantages to your vacuum system:
Reliable Vacuum Isolation: Leak rates below 1 × 10^-9 mbar·L/s guarantee minimal contamination.
Long Maintenance Intervals: Valves like the VAT 10.8 series can operate up to 50,000 cycles before service is required.
Adaptability: Multiple actuation options (manual, pneumatic, 3-position pneumatic) and flange standards (ISO-F, CF-F, ASA-L, JIS) allow seamless integration.
Low Cost of Ownership: Durable materials and proven designs reduce downtime and maintenance costs.
High Temperature Tolerance: Bake-out capability up to 250°C ensures compatibility with demanding vacuum processes.
