Patent ID: 8807224

Claim:
A subsea arrangement in the form of a heat bank for thermally insulating one or more elements of a subsea installation, the subsea arrangement comprising: an external casing which encloses an internal space arranged to accommodate seawater having a heat-storing capacity, therein, and arranged to receive said one or more elements of the subsea installation when deployed subsea so as to allow heat stored in the seawater within internal space and surrounding the one or more elements, to slow cooling of the one or more elements; and a pressure equalizing valve for equalization of fluid pressure in said internal space, comprising: a valve body, having: a base section extending through an opening provided in the casing, the base section being displaceably received in this opening, and a valve member secured to the base section and arranged inside the casing, the valve member extending laterally from the base section beyond the circumference of said opening in the casing; and a valve seat surrounding said opening in the casing, the valve member facing, the valve seat; wherein the valve body is axially displaceable upwards, under the effect of an external fluid pressure acting on the valve body from a resting position in which the valve member is in sealing contact with the valve seat and thereby prevents the seawater from flowing into and out of said internal space, to a raised position in which the valve member is raised from the valve seat and thereby allows the seawater to flow from the surroundings into said internal space for equalization of the fluid pressure therein when the subsea arrangement is lowered into the sea, and wherein the valve body is axially displaceable downwards, under the effect of gravity, from the raised position to the resting position to thereby prevent seawater from flowing into and out of said internal space when the fluid pressure in said internal space is balanced against the external fluid pressure acting on the valve body.