Abstract: A venting valve arrangement for diecasting molds comprises a venting conduit for venting the mold cavity, a valve piston in the venting conduit, and an actuating piston exposed to the action of the casting material. The actuating piston and the valve piston have substantially parallel axes and are interconnected by a positive interlock of the two pistons, or parts actuated by the pistons in the manner of followers. Several axially parallel adjacent actuating pistons may be provided, all acting upon a common transmission piston.

Abstract: A pressure die-casting block wherein two block halves are assembled together along a parting plane to provide an internal cavity. One of the block halves is provided with a venting valve the port of which opens into the parting plane to thus communicate with the cavity. In the assembled condition of the block an end face of the venting valve abuts an end face of the other half block and means are provided whereby these two abutting faces bear upon one another with a force additional to the force holding the two half blocks together.

Abstract: A pressure die-casting block, wherein two block halves are assembled together along a plane defining a parting plane of the blocks and provide an internal cavity for performing a die-casting operation. The block is provided with a device for attenuating pressure forces which arise during the casting operation, the device being disposed in one of the block halves and acting in the parting plane of the block.