Patent ID: 8453676

Claim:
A valve comprising: a valve body having a bore; a spindle received coaxially in the bore, the spindle being actuatable to open and close the valve; an annular gland seal positioned coaxially about the spindle between the spindle and the bore; a compression member disposed coaxially over the spindle, the compression member being actuable to effect the compression of the gland seal between the valve body and the spindle for providing a first seal therebetween; a first seal ring positioned coaxially about the spindle at a first position spaced along the spindle from the gland seal, the first seal ring being compressed between the valve body and the spindle for providing a second seal therebetween; and a second seal ring positioned coaxially about the spindle at a second position spaced along the spindle from the gland seal and the first seal ring, the second seal ring being compressed between the valve body and the spindle for providing a third seal therebetween.