'Gate valve, method for return drilling mud pressure control and / or well extinction and use of a gate valve.'

摘要

gate valve, method for controlling return drilling mud pressure and / or well extinction and use of a gate valve. The present invention relates to a gate valve (10), in particular for controlling returned drilling mud pressure and / or well extinction. the gate valve comprises: a flow passage (14) and a movable gate element (22) for intercepting the flow passage. the drawer element includes a drawer hole (28) extending from one face (34a) to an opposite face (34b) of the drawer element and is aligned with the flow passage to allow material in the flow passage to pass through the drawer element, and a notch or recess extending from one face to the opposite face of the drawer element. The present invention further relates to a method for controlling returned drilling mud pressure and / or well extinction, and uses of a gate valve.