What Is a Vacuum Pendulum Valve?
A vacuum pendulum valve is a type of isolation and control valve characterized by a pendulum-like gate that rotates to open, close, or modulate the flow through the valve opening. Unlike traditional gate valves that move linearly, the pendulum valve’s rotational movement moves the vacuum gate out of the flow path, allowing for precise control of vacuum conductance and isolation.
Key Characteristics
Rotational movement of the gate for smooth operation
Compact design suitable for direct mounting on process chambers
Low vibration and shock to minimize particle generation
High vacuum tightness with leak rates as low as < 1 × 10⁻⁹ mbar·L/s
Pneumatic or motorized actuation for precise control
Technical Insights: What Makes Vacuum Pendulum Valves Superior?
Leak Tightness and Pressure Range
Vacuum pendulum valves maintain exceptional leak tightness, often below 1 × 10⁻⁹ mbar·L/s, ensuring minimal contamination and high vacuum integrity. They operate effectively from ultra-high vacuum levels (10⁻⁸ mbar) up to atmospheric pressure (1.2 bar abs), making them versatile for various vacuum system stages.
Actuation and Control
Most models offer pneumatic double-acting actuators with options for 3-position control, allowing intermediate positions for precise flow regulation. Advanced versions like the 65.5 series include integrated servo drives and pressure controllers, providing real-time feedback and customizable valve behavior.
Materials and Durability
Bodies are commonly made from aluminum alloys (e.g., EN AW-6082, EN AW-6061) with hard anodized or nickel-plated finishes for corrosion resistance. Seals use FKM (Viton®) for chemical compatibility. Feedthroughs and gate components are stainless steel or similar high-grade materials to withstand harsh environments.
