In the simplest of terms, VAT pnematic vacuum gate valves are devices that regulate the flow of gases, fluids or materials through a structure or aperture by opening, closing or obstructing a port or passageway. Gate valve assemblies consist of three key components: an actuator, a carriage/gate and a valve body. The actuator provides the power to position or transport the valve’s carriage/gate. The actuator is attached to the valve’s body via a rectangular bonnet flange. The gate closes or opens one of the valve’s body ports. The valve body is a vacuum tight chamber that is screwed, flanged or welded into a larger vacuum vessel or system.

The VAT 91 Series Pneumatic Gate Valves feature a wedge shape gate design. The gate seal is pressed against the sealing surface by means of a pneumatic actuator. Shock and vibration are reduced to a minimum by a unique air cylinder design. This feature is extremely beneficial for demanding pump isolation applications, especially those with high levels of process byproduct in the gas stream

The VAT stainless steel body offers one of the smallest interior surface areas in the vacuum valve industry. The body and all major internal components are vacuum furnace brazed at 1100°C, at 1x10-6 Torr, ensuring maximum joint integrity. This eliminates the possibility of virtual leaks or entrapment areas and minimizes body distortion found in conventionally welded valves.

Position indicator wires are connected via the pneumatic actuator. They are simple contact switches that allow valve position to be confirmed through high or low conductance. These are low power contacts, for example, typical application would be 20 mA max at 120 VAC. This rebuilt gate valve comes equipped with a solenoid.

Specifications: These VAT 91 series pneumatic standard cycle gate valves are designed for dependable High and Ultra High Vacuum (UHV) applications, service lifes of 100,000 cycles are typical. They are often used in combination with cryo, turbo, and ion high vacuum pumps.