Absolute Vacuum Services UK Limited

United Kingdom

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Edwards GV Manual and Pneumatic Gate Valves In situ removal of gate and linkage mechanism for easy servicing Virtual leaks eliminated due to vacuum brazed manufacture Electropolished finish inside and outside Compact design with high conductance Manual design with high conductance Manual or pneumatic options Microswitch position indicator as standard on pneumatic version Reedswitch variants long periods of use between maintenance Low vibration and shock Free choice of orientation Wide range from 40mm / 1.56 in bore up to 320mm / 12.48 in bore Flange options – ISO, ASA or

r CF (metal sealed) The Edwards (Formerly BOC Edwards) GV range of stainless steel, bellows sealed gate valves is 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. The valves are available with flange options of ISO, ANSI or CF (Metal sealed) for applications at ultra high vacuum requiring increased bakeout temperatures. The stainless steel valve bodies are vacuum brazed, a special process which includes a bakeout at 1100 °C. This eliminates any possibility of virtual leaks and ensures a product with low outgassing characteristics. A laser welded stainless stee bellows effectively seals the actuator from the valve. The concept provides ease of servicing and allows the gate and linkage mechanism to be removed while the valve remains in situ. Technical data - Edwards GV Manual and Pneumatic Gate Valves Pressure range: <10-9 mbar to 1 bar (absolute) <8 x 10-10 – 750 Torr Leak rate <10-9 mbar | s-1 <8 x 10-9 Torr | s-1 Operating pressure range: 10-7 – 2000 mbar / 8 x 10 -8 – 1500 Torr 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 Position indicator switch, breaking capacity: 24 V d.c. 5 A 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 SS Seals, valve plate: Bonnet Metal sealed valves: OFHC Other valves: Fluoroelastomer Bakeout temperatures Valve body, valve open: 150 °C Valve body, valve open: 250°C Valve closed: 200°C Actuator, manual: 200°C Actuator, pneumatic: 100°C Average life until first service*: 100000 closures Mounting position: Any orientation Pneumatic operating pressure: 2-5.5 bar / 60 -80 psi * Dependent on the vacuum environment and the opening and closing speed
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