The GV range of stainless steel bellows sealed gate valves are designed for applications requiring overall leak tightness and a minimum of hydrocarbon in the residual atmosphere. These superior quality valves offer high vacuum integrity coupled with maximum conductance.
Technical data | |
Pressure range | 10-9 mbar to 1 bar (absolute) / 8 x 10-10 - 750 Torr |
Leak rate | < 10- 9 mbar l s- 1 / 8 x 10-10 Torr l s- 1 |
Maximum differential pressure on the valve plate | 1 bar / 750 Torr in either direction |
Maximum differential pressure on the valve plate at opening | 20 mbar / 15 Torr |
Material of construction | |
Body, valve plate | AISI 304 stainless steel |
Mechanism | AISI 304 stainless steel, |
Bearings | Hardened high carbon chrome steel |
Circlips | SS PH 15-7 Mo |
Bellows | AM 350 stainless steel |
Seals, valve plate | Fluoroelastomer |
Bonnet | |
Metal sealed valves | OFHC |
Other valves | Fluoroelastomer |
Bakeout temperature | |
Valve body, valve open | 150°C (fluoroelastomer bonnet seal) |
Valve body, valve open | 250°C (metal bonnet seal) |
Valve closed | 200°C |
Actuator, pneumatic | 100°C |
Average life until first service* | 100000 closures |
Mounting position | Any orientation |
Flange bore | 320 mm |
12 in | |
Conductance in high vacuum | 39000 ls-1 |
Approx weight | 77 kg |
* Dependent on the vacuum environment and the opening and closing speed.