Patent ID: 11859725
Assignee: EDWARDS LIMITED
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  C | IPC C  F

Claim 12:
13. A system comprising: a vacuum pump having an exhaust; and a pair of abatement systems teed into the exhaust; wherein a valve is positioned upstream from each of the abatement systems, the valve comprising:
a housing with at least one inlet and at least one outlet;
a valve member located within the housing and being moveable between different positions for controlling, in use, the flow of a fluid from an inlet to an outlet of the valve;
at least two spaced-apart valve seats in which the valve member is seated so as to form a cavity bounded by the valve seats, an exterior surface of the valve member and an interior surface of the housing;
a first conduit extending between the exterior of the housing and the cavity; and
a second conduit extending between the cavity and a bore of the valve member, through which conduits, in use, a purge gas can be introduced into the cavity and bore.