Abstract: A faucet including: a body having an axis channel; a spherical rotating closure mounted pivotable in the body, between a closed position and an open position, the closure including a through orifice allowing the passage of a fluid from an upstream pipe to a downstream pipe, in open position; an upstream seat having a central passage, mounted in the channel of the body upstream of the closure so as to be mobile in translation along the axis and urged towards the closure by elastic means; a protuberance provided in the upstream seat projecting towards the closure, and a recess provided on the closure, to co-operate with the protuberance in closed position of the closure; and means for equalizing the pressure between upstream and downstream of the upstream seat, prior to the faucet being opened.

Abstract: The invention concerns a faucet (1) comprising: a body (2) having an axis channel (3); a spherical rotating closure (6) mounted pivotable in the body, between a closed position and an open position, the closure including a through orifice (10) allowing the passage of a fluid from an upstream pipe to a downstream pipe, in open position; an upstream seat (15) having a central passage (16), mounted in the channel of the body upstream of the closure so as to be mobile in translation along the axis (3) and urged towards the closure by elastic means (27); a protuberance (31) provided in the upstream seat projecting towards the closure, and a recess provided on the closure, to co-operate with the protuberance in closed position of the closure; and means for equalizing the pressure between upstream and downstream of the upstream seat, prior to the faucet being opened.

Abstract: A ball valve has a movable upstream valve seat with a metal lip engageable with the valve ball under pressure generated by a bellows section or metal membrane connected between the movable valve seat and the housing. The force of fluid pressure against this moveable valve seat is relieved by operation of a bypass valve connecting opposite sides of this seat. The ball can also have a deformable metal lip.