Patent ID: 9512931
Filing Date: 2016-12-06
CPC Classification: F16K

Claim Text:
1. A valve assembly for controlling flow through a fluid pathway comprising: a valve body having a bore; a spindle received within the bore which is actuatable to open and close the valve assembly, the spindle having an axially upstream end arranged towards the fluid pathway and an opposing downstream end; a first seal provided about the spindle between the spindle and the bore; a first resilient biasing element arranged to impart an axial compressive force to the first seal, wherein the first resilient biasing element is located within the valve body between the spindle and the bore on the downstream side of the first seal; a second seal provided about the spindle between the spindle and the bore which is axially spaced along the spindle at a position downstream from both the first seal and the biasing element; and a second resilient biasing element for imparting a compressive force to the second seal, wherein the compressive force imparted by the second resilient biasing element to the second seal is adjustable independently of the axial compressive force imparted by the first resilient biasing element to the first seal.