Completely Fixed Valves for Injection Molding

These are generally considered ball-check Screw Tip sets s. The entire valve is fixed to the feed screw flow through channels on the inside of the Screw Tip Set with a ball or pin to control flow.
These designs offer the best consistency for shot control; however, many designs offer very limited flow volumes and can be difficult to purge. Having a fixed rotation with the screw,the largest wear impact is on the outside diameter. General wear of this outside surface dictates the useful life of the Rings . Injection molding valves are subject to extreme forces of temperature, pressure, torsion, abrasion and impact. These forces impact different design valves in various ways, based on factors like injection pressure, screw speed and the materials processed.
The most common force concern of molders tends to be the abrasion and wear generated from it.
This design provides very high flow volumes compared to other designs, using a concept which supports the ball allowing only lateral movement. This allows the use of larger sealing surfaces as well as flow areas, providing volumes that in many sizes offer similar flow to standard ring valves. The front discharge provides improved flow characteristics over tip and side flow designs, with replaceable internal wear components for extended use. This type of Screw Tip Set are used in such applications where other ball check designs create screw recovery and purging issues