MDP™ Performance Non-Return Valve

Proven Design Offers:

GET BETTER MELT DELIVERY

Our patented (patent# 7,527,493) MDP™ Performance Non-Return Valve is used throughout the world by both injection molders and molding machine OEMs. Its success is tied directly to its performance.

With more molders opting to instill scientific molding systems into their process, they must rely on non-return valves that shut off quickly and maintain shutoff through the full stroke of the screw. The MDP™ Performance Non-Return Valve assures injection molders that this critical function is achieved in a reliable and repeatable manner. If your non-return valves are not giving you the results you need, then please give us a call. We can help!

WHY YOU NEED THE
MDP™ PERFORMANCE NON-RETURN VALVE

Low Pressure Drop For Improved Hydraulics

An NRV for the injection molding industry is an interesting yet complicated hydraulic model. Polymers in the melt state are 10k to 100k more viscous than water but tried and proven
formula for hydraulic performance can be used to calculate the pressure drop through the valve. We have determined that low pressure drop is good for a number of reasons; less work for the screw, the pressure gradient along the axis of the screw in the upstream direction is lower, and the shutoff component (ring) has less resistance to close upon the injection forward movement.

Precise Shutoff & Low Part Weight Variance

Our improved hydraulic design with the lowest pressure drop in the industry means that the ring is free to move with less resistance, and melt decompression is not normally needed to assist the shutoff performance. Consistent shutoff means less part weight variance shot-to-shot, and since part weight is the single most reliable measurement of determining that a quality part has been produced, we guarantee improved part quality and productivity.

Works With ALL Polymers and ALL Sizes From 14-260mm

A true testament to an improved/low pressure drop design would be a valve that can process virtually ALL resin groups from CPVC to LCP, filled and unfilled. We have been successful processing all of the above with remarkable shot-to-shot consistency.

Extended Wear Life

In order to improve wear life of an NRV, two criteria are important; (a). Hydraulic design (b).Metallurgy. Three types of wear can occur, Abrasive, Adhesive and Corrosive. Wear
between the ring and retainer is the main issue with performance and this wear falls into the adhesive category, (steel against steel) and low pressure drop across the ring = lower force applied to the interface. The interface/discharge plane of our MDP performance valve is the key to low pressure drop of the design, the WC retainer pin and the Tool Steel Ring exhibit minimal wear over an extended period of time (6-7 years in some cases).