Flap valve and seal with improved seal geometry for such a valve

A valve closure, for a vacuum valve, for regulating a volume or mass flow and/or for closing and opening a valve opening, having

• a coupling side comprising a coupling which is designed for coupling to a drive unit of the valve, and
• a rear closing side relative to the coupling side with a seal that corresponds to a sealing surface of a valve seat of the valve,
• wherein:
• the valve closure has a retaining region on the closing side,
• the seal is designed as a sealing element according to one of the preceding claims, and
• the fastening body of the fastening region is connected to the retaining region.

A valve, wherein the valve is a vacuum valve, for regulating a volume or mass flow and/or for closing and opening a first valve opening, having

• a valve housing with the first valve opening and an opposing second valve opening, wherein the first valve opening defines an opening axis and the opening axis extends through the first and the second valve opening,
• a valve seat that extends around the first valve opening and has a first sealing surface extending around the first valve opening,
• a valve closure, for regulating the volume or mass flow and/or for substantially gas-tight closure of the valve opening, and
• a drive unit coupled to the valve closure, which is adapted to provide a folding movement of the valve closure about an axis of rotation oriented orthogonally relative to the opening axis in such a way that the valve closure is moved from
• an open position, in which the valve closure releases the first valve opening to the maximum, into
• a closed position, in which there is a sealing contact between the valve closure and the valve seat and the first valve opening is thereby closed in a gas-tight manner,
• and is adjustable back again,
• wherein:
• in the open position, at least a part of the valve closure projects into the second valve opening.