Hydraulically lockable variable camshaft phaser

A camshaft phaser for an internal combustion engine, the camshaft phaser comprising:

• a stator defining a receptacle, the stator including a ring and a plurality of webs extending radially inward from the ring;
• a rotor rotatably received inside the receptacle, the rotor including a center section and a plurality of vanes extending radially outward from the center section, the center section abutting the plurality of webs so as to define a chamber between adjacent pairs of webs of the plurality of webs, each vane respectively associated with each chamber so as to sealingly engage an inner circumferential surface of the ring, at least one of the chambers being a locking chamber and the associated vane of each locking chamber being a locking vane;
• and
• a locking valve arranged in each locking vane, the locking valve configured to enable fluid to enter the locking chamber and to prevent the fluid from flowing out of the locking chamber so as to rotationally lock the rotor with respect to the stator in a locked orientation,
• wherein the camshaft phaser does not include a mechanical locking device for rotationally locking the rotor with respect to the stator.