Patent ID: 9540905
Date: 2017-01-10
CPC Classifications: E21B,F16K

Claim:
1. An injection device for use in injecting a fluid into a downhole target location, comprising: a housing defining an inlet for communicating with an injection line, an outlet for communicating with a downhole target location, and an injection fluid flow path extending between the inlet and outlet; a valve assembly located within the housing and configured to control the flow of injection fluid along the flow path, the valve assembly comprising first and second valve members both arranged to move within the housing; a limiting arrangement configured to limit or restrict movement of the first valve member, the limiting arrangement including a limiting feature fixed relative to the housing and a corresponding limiting feature fixed relative to the first valve member; wherein, in an open configuration to flow, the first and second valve members are disengaged, and in a closed configuration to prevent flow, the first and second valve members are engaged and the corresponding limiting features are of the limiting arrangement are separated such that the first valve member is biased against the second valve member by inlet fluid pressure to assist sealing therebetween.