Zpringlok® Valves    The MALLARD® Zpringlok® valve combines the benefits of positive check ring shut-off with the quality of the 4-piece interlocking valve.  The design features a stainless steel spring located in the check ring and dos not require screw movement to close the valve.  Recommended for high-speed non-filled low viscosity molding environments where shot consistency with conventional slider or locking-ring valves is a concern - such as LCP, LSR, and MuCell™ applications.  For optimum flexibility, all Zpringlok® parts are interchangeable with MALLARD® 4-piece standard & carbide-faced valves.