Patent ID: 8091861

Claim:
A valve for use in connection with oil and gas production comprising: a valve housing connected to at least one inlet and an outlet, the at least one inlet and the outlet together define a flow channel through the valve; a valve body arranged to selectively open and close for fluid flow in said flow channel; and at least one valve seat, said valve seat being provided with at least one seal against the valve housing, wherein the valve seat is provided with an undercut on that side of the valve seat that faces the valve body, said undercut is in direct fluid communication with the flow channel, and the undercut has an area which is influenced by the pressure from the flow channel, and said area is at least as large as an area at an opposite end of the valve seat which is influenced by the pressure from the flow channel, said area being defined by a distance between the flow channel and the at least one seal and the circumference of the flow channel, and wherein the valve seat is provided with a guiding ring surrounding the valve seat and leaning against the valve housing at the end thereof facing the valve body, said guiding ring being arranged to form a guide for the valve body and comprising protrusions which are arranged to abut against the valve body to stabilise the valve body in a direction traverse to the extension of the flow channel.