Special valve is not a type of valve but a broad term that refers to a category of valves designed for specific and specialised applications within vacuum systems.
These valves come in various sizes and designs, including manual and pneumatic and often incorporate advanced features to address the specific challenges of their intended applications.
AV5A air admittance valves with couplings
The AV5A is manufactured in aluminium alloy. It has a control knob attached to a screw‑actuated plunger: turn the control knob clockwise to close the valve. A nitrile O-ring seals the plunger to the valve body.
The valve can be connected directly, pipeline supported or panel mounted, and is connected to the vacuum system with the Edwards SC5 coupling (supplied).
Simple manual air admit valve
Connects directly, pipeline supported or panel mounted
Connects via a SC5 coupling (supplied)
AV10K air admittance valves
The AV10K is manufactured and works in the same way as the AV5A, but it is connected differently.
This valve can be pipeline supported only and is connected to the vacuum system with an NW10 fitting.
Simple manual air admit valve
Pipeline supported only
Connects via a NW10 fitting
BRV backing/roughing valve
BRV backing/roughing valves with ISO NW roughing and fore pump 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 fore pump ports terminate in the appropriate NW termination.
Easy to operate ‑ both ports closed position
Long life ‑ 100,000 operations or more
Position indicator on pneumatic valve
Leak tight to better than 10‑9mbar ls‑1/8 x 10‑10 Torr ls‑1
IPV10EK air admit valve NW10
The IPVA10EK is a solenoid operated valve designed for automatic admittance of air or vent gas into a vacuum system.
The valve has two ports with NW flanges. One of the valve ports is connected to the vacuum system, the other port can be left open to atmosphere or connected to a vent gas supply.
The vacuum system is isolated from atmosphere (or the vent gas supply) by a fluoroelastomer pad on the base of the valve plunger, which seals against the body of the valve.
Normally open or normally closed option
MTTF 500,000 cycles
QSB quarter swing butterfly valve
The QSB quarter swing valves are compact, quick acting, high conductance isolation valves. The QSB valves have a polished, stainless steel, ISO flanged body with fluoroelastomer O-ring sealed valve plate and shaft. The valve plate O-ring groove is vented to help maintain a stable high vacuum. The valve shaft O-rings and bearings are lubricated with Fomblin® grease to prevent gas bursts from behind the shaft seals.
This valve is supplied with a co‑seal.
Resists atmosphere in either direction
Compact and quick acting
Corrosion resistant construction
VIV vacuum isolation valve
The VIV vacuum isolation valve is a high conductance, fast acting high vacuum isolation valve that is designed to prevent the movement of vapour or particulates from the backing pump to the process chamber.
When the VIV is closed, the backing pump is safely vented. The VIV protects the process chamber from being vented when the pump stops or is stopped. When the backing pump is restarted, the valve will slowly open when the pressure within the VIV has dropped, minimising the effects of any pressure burst.
VIV vacuum isolation valve is intended for use with Edwards small dry primary pump range nXDS, XDS, nXLi and nXRi.
Fast closing action
Power failure protection
Flexible installation options
Does not restrict primary pump performance
Prevents migration of vapour or particulates from the backing pump to the process chamber
Prevents process chamber venting in the event of a power supply failure
For Edwards backing pumps fitted with the M8 valve connector or the 15 way D Type logic interface connector, we recommend the use of 24V dc valves and optional accessory cable or VIV Link as this offers increased levels of protection.