GNB Corporation G3PSO Vacuum Gate Valve 3" Opening 7.5" Flange Pneumatic SS

GNB Corporation G3PSO Vacuum Gate Valve 3" Opening 7.5" Flange Pneumatic SS

The GNB Corporation G3PSO is a stainless steel pneumatic gate valve designed for use in high-vacuum chamber systems. It features a 3-inch clear opening with a 7.5-inch bolt-circle flange, and uses a pneumatic actuator to drive the gate blade open or closed, allowing fast, reliable isolation of vacuum line segments without manual intervention. The valve body is constructed of stainless steel for compatibility with clean, high-vacuum environments.

Specifications & What's Included

• Model: GNB Corporation G3PSO
• Type: Pneumatic gate valve
• Body material: Stainless steel
• Gate opening diameter: 3 inches
• Flange outer diameter: 7.5 inches
• Actuator type: Pneumatic (brass cylinder actuator)
• Actuator body: Brass
• Date of manufacture: October 1980
• Country of manufacture: USA (Hayward, California)
• Includes: Valve body with integrated pneumatic actuator assembly

Applications

Pneumatic vacuum gate valves of this type are standard components in high-vacuum and ultra-high-vacuum (UHV) systems used in semiconductor processing, physical vapor deposition (PVD), sputter coating, chemical vapor deposition (CVD), electron beam evaporation, and research vacuum chambers. The gate valve's role is to isolate sections of the vacuum system — for example, separating a process chamber from a pumping line or load-lock — without breaking the vacuum in adjacent sections. Pneumatic actuation allows automated or remotely controlled valve operation, which is common in production and research environments where repeated cycling or interlocked safety systems are required. Stainless steel construction makes these valves compatible with the stringent cleanliness requirements of semiconductor fab and thin-film deposition tools. Gate valves in this size range (3-inch bore) are commonly used on medium-to-large vacuum chambers and foreline connections. The GNB Corporation, based in Hayward, California, was a well-regarded domestic manufacturer of vacuum chamber hardware and gate valves; this unit dates from October 1980, placing it in the early era of domestic vacuum component manufacturing for the growing semiconductor and thin-film industries.