Edwards 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 termination.
both ports closed position
100,000 operations or more
on pneumatic valve
to better than 10-9mbar l/s
Chemical & Gas Recirculation variants
Leak rate
Max baking temperature (pneumatic)
Max baking temperature (Manual)
Reliability MTTF
mbar l/s
°C
°C
cycles
BRV10K
<10-9
70
90
100000
BRV10PK
<10-9
70
90
100000
BRV25K
<10-9
70
90
100000
BRV25PK
<10-9
70
90
100000
Recommended air pressure
Weight (Stainless Steel)
bar
g
2.8 - 4.2
350
2.8 - 4.2
380
2.8 - 4.2
860
2.8 - 4.2
900
Spectroscopy magazine