Venting valve for an injection molding tool has openings in the main parts to allow a venting piston to be actuated by compressed air while a sealing punch remains fixed

摘要

Openings in a base body(1), clamping plate(2) and valve housing(4) allow a venting piston(9) to move axially in both directions while a sealing punch(3) remains stationary. Movement of the venting piston is effected by compressed gas. The base body(1) is detachably connected to the valve housing(4) and the venting piston(9) is guided in the housing without rotating(8). Venting channels are distributed over the internal surfaces of the venting piston and a radial outlet vent(B) is provided in the piston. A seal(6) prevents air leakage through the venting channels. The sealing punch(3) is held in position by a clamping plate(2) after assembling the base body and valve housing(4). An opening(A) in the base body allows compressed air to pressurize the piston and air leakage is prevented by an interchangeable seal(7). Openings for air outlet(B) and introduction of compressed air(C) in the valve housing are sealed by interchangeable seals(5) around the periphery of the housing.