Patent : Mini-Shut™

Industry Proven

Posi-Shut^™ Automatic Shut-Off Valve

Precise shutoff with shot-to-shot consistency

Patented Mini-Shut™ replaceable cartridge technology

Mechanically operated independent of screw movement

Consistent Part to Part Weight

Low Pressure Drop and Low Shear

High Throughput and Self Cleaning

DON'T JUST TAKE OUR WORD WATCH TO SEE HOW IT WORKS

Technical Specifications at a Glance

Detailed specifications and technical parameters for the Posi-Shut™ Automatic Shut-Off Valve system.

Parameter

Specification

Size Range

50MM and up for thermoplastics

LSR Customization

Customized design and size range available

Patent Technology

Patent #8734146 replaceable shutoff cartridge

Construction Material

Wear resistant heat treated H13 tool steel

Treatment Options

Metallurgical and surface treatment available

Closure Mechanism

Belleville springs kinetic energy system

Operation Type

Mechanically operated poppet valve

Screw Independence

Independent of screw movement

Application Range

All machine sizes and polymers

Country of Origin

🇺🇸 United States

Why Posi-Shut™ Automatic Shut-Off Valve?

The objective of Md Plastics Posi-Shut™ Valve is to empower the processor with advanced control of the valve shut off mechanism during molding. This is accomplished by eliminating a need for decompression and facilitating valve shut off at melt recovery independent of the screw’s movement forward. In a perfect molding scenario, the non-return valve closes quickly, completely at the same time for each shot. Without restriction and sacrifice of flow and self-cleaning characteristics. This action ensures a repeatable process consistent from shot to shot. The benefit is lower reject rate, higher part quality, maximum yield rate and increased profit margin.

The Posi-Shut™ Valve is a mechanically operated poppet valve that is independent of screw movement to facilitate closure. The valve’s standard construction is of wear resistant heat treated tool steel and there are metallurgical and surface treatment options for extreme abrasion and corrosion wear environments.

The Posi-Shut™ valve utilizes the patented Md Plastics Mini-Shut™ technology with a replaceable shutoff cartridge patent number #8734146. The valve closure is expedited by the kinetic energy created by the Belleville springs to achieve instantaneous and precise closure at the sealing surface with each shot. Upon screw recovery, valve closure and shot delivery the valve then opens upon screw rotation and positive melt flow preparing for the next shot to be delivered. Each shot is delivered with precise "Shutoff" for each cycle.

The Posi-Shut™ valve is compatible with most resins processed in the injection molding industry. A distinctive version is available for the processing of Liquid Silicone Rubber “LSR.” The Posi-Shut™ Valve is an excellent valve selection for structural foam molding. Consult Md Plastics technical staff for design considerations in molding applications involving difficult to process resins.

Engineered for Maximum Performance

Advanced valve technology delivering superior process control and consistent quality for injection molding operations.

Precise Shutoff Control

Mechanically operated poppet valve provides instantaneous and precise closure at sealing surface, ensuring shot-to-shot consistency and eliminating material waste through superior shutoff performance.

Independent Operation

Valve operates independently of screw movement, facilitating valve shut-off at melt recovery and eliminating the need for decompression while maintaining optimal process control throughout the molding cycle.

Patented Technology

Features patented Mini-Shut™ technology with replaceable shutoff cartridge (Patent #8734146), providing proven reliability and cost-effective maintenance for extended operational life and consistent performance.

Durable Construction

Standard construction utilizes wear-resistant heat-treated H13 tool steel with optional metallurgical and surface treatments available for extreme abrasion and corrosion environments, ensuring long-term durability.

Enhanced Productivity

Reduces scrap rates and reject rates while improving overall part quality, maximizing yield rates and increasing profit margins through consistent part-to-part weight control and superior process repeatability.

Versatile Applications

Compatible with most resins processed in injection molding including standard thermoplastics, LSR processing, structural foam molding, and difficult-to-process resins with customized design options available.

Frequently Asked Questions

What makes the Posi-Shut™ valve different from other shut-off valves?

The Posi-Shut^™ features patented Mini-Shut™ technology with a replaceable shutoff cartridge and operates mechanically independent of screw movement. This provides instantaneous shutoff, shot-to-shot consistency, and eliminates the need for decompression, resulting in superior process control and reduced scrap rates.

What size range and materials are compatible with this valve?

The Posi-Shut^™ valve is available in 50MM and up for thermoplastics, with customized design and size ranges available for Liquid Silicone Rubber (LSR) processing. It's compatible with most resins processed in injection molding, including standard thermoplastics and difficult-to-process resins.

How does the valve achieve such precise shutoff performance?

The valve uses Belleville springs to create kinetic energy that expedites valve closure, achieving instantaneous and precise closure at the sealing surface with each shot. This mechanical system ensures repeatable performance and consistent part-to-part weight control.

What construction materials and treatment options are available?

Standard construction uses wear-resistant heat-treated H13 tool steel. Metallurgical and surface treatment options are available for extreme abrasion and corrosion wear environments, ensuring optimal performance in demanding processing conditions.

Industries We Serve

Serving diverse sectors with specialized plasticating solutions for enhanced manufacturing performance.

Automotive

Precision plasticating solutions for high-quality automotive components requiring consistent melt quality and performance.

Medical Devices

Advanced plasticating technology ensuring purity and precision for critical medical device manufacturing applications.

Consumer Electronics

Innovative solutions for complex electronic housings and components requiring superior surface finish and dimensional accuracy.

Additive Manufacturing

Specialized plasticating systems for 3D printing and additive manufacturing, delivering consistent filament quality and material flow.

Plastic Processing

Comprehensive plasticating solutions for general plastic processing applications across various manufacturing sectors.