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

Claim 0:
1. A 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
wherein the valve member is rotatable between first and second positions such that the bore does not align with either the inlet or the outlet in the second position and the purge gas is dead-headed when the valve member is in the second position.