Backing/roughing valves with ISO NW roughing and forepump terminations feature manual or pneumatic actuation. They combine the function of separate backing/roughing valves in one integral 3 port unit.
A flexible neoprene connector is supplied for the backing connection. The roughing and forepump ports terminate in the appropriate NW flange.
Technical data | |
Construction materials | |
Body and pneumatic cylinder | HE 30TF aluminum |
Lever and bonnet (manual) | Glass reinforced plastic |
Operating shaft/valve seat | Stainless steel |
Body seals, port seals, shaft seal ‘O’ ring | Fluoroelastomer |
Leak rate | |
Overall | < 10-9 mbar ls-1/ < 8 x 10-10 Torr ls-1 |
Across ports | < 10-9 mbar ls-1 / < 8 x 10-10 Torr ls-1 |
NW coupling | < 10-9 mbar ls-1 / < 8 x 10-10 Torr ls-1 |
Operating pressure range | 10-7 - 2100 mbar / 8 x 10-8 - 1575 Torr |
Max baking temperature | |
Pneumatic | 70°C |
Manual | 90°C |
Reliability (MTTF) | 100000 cycles |
Recommended air pressure | 2.8 - 4.2 bar / 40.6 - 61 psi |
Maximum air pressure | 7.0 bar / 102 psi |
Minimum air pressure | 2.4 bar / 35 psi |
Air connections | 1/8 in BSP, for 6 mm Ø plastic or copper tube |
Microswitch rating | 24 V 1.5 A a.c. or d.c. |
Weight | |
BRV10K | 350 g / 12 oz |