BRV25K Backing/Roughing Valve, Manual Operation
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.
Informacje
Features and Benefits
- Easy to operate - both ports closed position
- Long life - 100000 operations or more
- Leak tight to better than 10-9 mbar l s-1 / 8 x 10-10 Torr l s-1
Applications
- The valves have been designed particularly for the Diffstak® pumping systems, but have applications where a compact change-over valve is required in the pressure range 10-7 - 2000 mbar / 8 x 10-8 - 1500 Torr.
Dane techniczne
| 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 | |
| BRV25K | 860g / 30oz |
Pliki do pobrania
BRV Mk IV Backing/Roughing Valves Instruction Manual