A tamper-evident device for valves comprises: an anti-theft buckle (1), provided with an anti-theft buckle body (17), a pulling portion (4), a tearable portion (5), an elastic hook (7), and a position limiting surface (6); an anti-theft cover (2), provided with a position limiting contour (8) and a hook receiving portion (9); and a position limiting slot (10) provided at a passage outlet (13) of a valve body (3). During use, the anti-theft cover (2) is connected to the passage outlet (13), and the elastic hook (7) is hooked to the hook receiving portion (9) and fitted to position limiting slot (10) to limit relative positions of the anti-theft cover (2) and the valve body (3). Also disclosed is a valve having the temper-evident device. The temper-evident device is easy to open and can effectively prevent stored materials from being stolen.

A stopper for fluid coupling and including a self-locking sheath designed to be slipped onto a connector, the sheath extending about a central longitudinal axis and including on its inner surface and at a first end, a tapped portion designed to engage with a mating threaded portion formed on the outer surface of the connector where the tapped portion includes at least one recess parallel to the longitudinal axis, where the inner surface of the sheath includes, at a second end opposite the first end, a spindle extending inside the sheath in a direction parallel to the longitudinal axis towards the second end of the sheath as far as a free end located between the first and second ends of the sheath, the free end of the spindle being designed to form a protective cover for a surface of the connector designed to engage with a filling tool.