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Sliding Type Valves
The NTP sliding ring valve is designed for general purpose applications
The APV family of closure valves (R. Dray Manufacturing) utilizes a sliding closure design, requiring no fast initial velocity to close the valve. This design provides faster closure and more consistency and is suitable also for low-viscosity polymers
Benefits
- Greater durability through application-tailored materials
- Lower cost through replaceable components and low initial investment
- Greater flexibility through user selectable levels of wear performance
Applications
- Industry-standard design
- Flow path design can be tailored to a wide range of resins
- Materials of construction range from standard H13 and D2 tool steels to high-performance CPM grades
- Available in three-piece and four-piece
configurations
Castle/lock type Valves gn Plunger
The NTP castle ring valve is designed for general purpose applications
The Interlocking (or Castle) design has tabs that interlock with slots on the retainer. This requires the ring to turn with the screw, eliminating wear between the ring and the front seat. Side loading is applied to the interlocking components, making this interface critical.
Benefits
- Improved wear life in abrasive applications
- Consistent part weight
Applications
General purpose with abrasive filler
BMC Ring Plunger
The NTP sliding ring valve is designed for general-purpose applications
NTP has designed a valve that has been statistically proven to provide extremely consistent shot-toshot repeatability with many difficult to process resinss
Benefits
- Longer service life through improved
wear - Greater processing flexibility
- Better product quality through
elimination of burning and black specks - Enhanced product quality through
lower part weight deviation
Applications
RPVC
Ball check Valve
The NTP sliding ring valve is designed for general-purpose applications
There are two basic types of ball check valves: (1) Front Discharge and (2) Side Discharge, with modifications to the ball and seat sizes that determine flow rates. The body and hence the O.D. rotate with the screw and have to accept a compressive load during plasticating.
Benefits
- Superior shot repeatability
- Easy maintenance
- Low part weight deviation
- Good wear performance
- Can be rebuilt by re-seating and
installing new ball
Applications
- All polyolefin-based materials with greater than 8 MI
- Polystyrene
- LSR
Customised Mixing Design Plunger
The CMD valve has individual replacement parts for the wear areas. The front seat can also be reversed for continued wear. The pressure drop is low and the design is streamlined. This is a design patented by CMD Corporation.
3-Piece Free Flow Valve
valve has a positive shut-off, is versatile with most all resins, and is free-flowing, yet self-cleaning. To accomplish this, we made the shut-off mechanism independent of the travel of the screw.
Benefits
- Consistent performance
- Superior shot control
- Less scrap produced
- Extended service life
- Reduced shear and black specks
Applications
- Free-flowing, positive shutoff, self-cleaning
- Most consistent shot-to-shot repeatability in the industry
- The Shut-off mechanism operates independently of screw travel
