Injection Molding Non-Return Valves
SpiraMelt Technologies SRV Injection Molding Screw Tips are the preferred non-return valve choice for serious molders. The Shot-Replicator-Valve family offers world-class repeatability, fast shut-off, low restriction, and excellent wear resistance. Each SpiraMelt valve assembly is custom-designed to meet your specific molding requirements. Eliminate excessive cushion variation and erratic performance with the SRV screw tip family.
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Injection Molding Screw Tip Assemblies
The non-return valve is often overlooked in the injection molding industry. The screw tip should not be treated as a simple, cheap wear component. Instead, special consideration should be taken when choosing the correct valve assembly for your production. The non-return valve largely controls part weight variation, cushion variation, and overall process repeatability. At SpiraMelt Technologies, our team of expert screw and valve designers has developed the most accurate, flexible, and long-lasting valve assembly available – the SRV Screw Tip family.
Injection Molding Non-Return Valves to Fit Any Machine
Our SRV Screw Tips can be adapted to fit any injection molding machine! We have a robust database of countless cavity and valve envelope drawings, if we don’t have reliable dimensions for your press, our team will work with you to measure and confirm fit dimensions for a sure fit.
We offer screw tip assemblies ranging in sizes from 12mm – 250mmØ for all injection molding machines. Each valve assembly is specially engineered to be optimized for the resin(s) being processed.
- Precise Shutoff & Improved Part Weight Variation
- Low Pressure Drop For Improved Recovery Time
- Optimized For ALL Polymers & Screw Sizes
- Extended Wear Life
Why the SRV Is the Last Valve You'll Ever Use
The SRV Shot-Replicator-Valve
Get the Industry's Non-Return Valve
The SpiraMelt SRV Screw Tip Family Features
Custom Designed Injection Molding Non-Return Valves
Standard SRV (Shot-Replicator-Valve)
Standard SRV Injection Molding Non-Return Valve
SRV Vortek Mixing Valve
SRV Vortek Injection Molding Non-Return Valve
SRVi (Interlocking / Castellated)
SRVi Interlocking/Castellated Injection Molding Valve
Faster Shut-Off, Less Cushion Variation
Unlike conventional check ring assemblies that rely on an angled rear seat and ring for closure, the SRV Screw Tip utilizes sliding closure to achieve rapid, consistent closure – every shot. Sliding closure with the SRV Screw Tip allows for a much shorter distance to close than conventional check rings. This means – no backflow or leakage, more positive closure, and less cushion variation. The SRV typically has 1/4 the ring travel compared to OEM style “free flow” valve assemblies.
Real-World Results From Real Customers
| Resin | Screw Diameter | Cushion Variation | Recovery Time Variation | Cycle Time Variation | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
80 MFI PP |
60mm |
±0.002" (±0.051mm) |
±0.04 seconds |
±0.01 seconds |
||||||
|
80 MFI PP |
50mm |
±0.003" (±0.076mm) |
±0.08 seconds |
±0.01 seconds |
||||||
Compiled from real customer production data
Less Restriction and Leakage Than Your Valve
Conventional rear seat closing valves that utilize on an angled ring and seat sealing surface rely on excessive ring and seat thickness (sealing surface area) and ring-to-barrel friction to close. The larger sealing surfaces in these valve designs require longer ring travel to reduce pressure drop because the sealing surface is equivalent to land length in pressure drop calculations. An SRV non-return valve simply requires the ring to slide past a circumferential groove in the valve body to close. This allows for essentially zero land length or 0 psi pressure drop during recovery!
Faster Recovery Times With Less Wear
The SRV closes much faster than conventional designs, eliminating leakage or backflow and significantly reducing cushion variation. This less restrictive design enables faster, more accurate recovery times, less erratic temperature fluctuation, and an increased ring-to-barrel clearance without leakage over the ring – eliminating premature wear of your barrel ID and valve components.
The SRV is a custom-designed solution with off-the-shelf pricing and delivery. Rather than a one-size-fits-all approach, SpiraMelt Technologies understands that each company has specific production requirements that require engineered solutions. Each SRV screw tip assembly is tailored to optimize your machine-to-material relationship. The distance to close, groove geometry, ring length, seat clearance, etc., are all optimized to best suit the resin(s) you process so that you can achieve a consistent cushion and part weight, regardless of viscosity.
Valve Materials and Specifications
The SpiraMelt SRV Screw Tip family is engineered to last! 100% certified tool steels with tolerances that exceed OEM specifications!
Our standard SRV valve option utilizes a combination of quality high-hardness tool steels to provide excellent wear resistance for most applications:
- D2 Tool Steel bodies and rear seats, through hardened to 57-60 HRc
- A2 Tool Steel rings, through hardened to 55-58 HRc
- For larger valve assemblies >100mmØ, H13 Tool Steel rings, through hardened to 54-56 HRc
- All pilots/and threads are tempered to 36-40 HRc for improved strength without sacrificing wear life performance downstream.
For aggressive, highly filled applications that require extreme wear resistance, we offer a premium high-wear SRV valve option to maximize wear life to keep you up and running longer:
- CPM-10v Tool Steel bodies and rear seats, through hardened to 60-62 HRc
- CPM-9v Tool Steel rings, through hardened to 54-56 HRc
- For larger valve assemblies >100mmØ, H13 Tool Steel rings, through hardened to 54-56 HRc, with additional nitriding
- All pilots/and threads are tempered to 36-40 HRc for improved strength without sacrificing wear life performance downstream.
For corrosive and/or abrasive applications that demand high wear and corrosion resistance, we have a solution for you:
- CPM-S90v Tool Steel bodies and rear seats, through hardened to 56-59 HRc
- CPM-S90v Tool Steel rings, through hardened to 52-54 HRc
- For larger valve assemblies >100mmØ, H13 Tool Steel rings, through hardened to 54-56 HRc
- All pilots/and threads are tempered to 36-40 HRc for improved strength without sacrificing wear life performance downstream.
No worries! Our team of experts will recommend the SRV variant that best suits your application and requirements. Each valve is custom-designed by our team to give you the best repeatability in the industry!
The SpiraMelt Shot-Replicator-Valve family offers best-in-class accuracy and repeatability. We have standard, castellated, mixing, and mixing/castellated options for any injection molding machine. Our valves are designed to last, built with premium, through hardened tool steels. We offer valve assemblies ranging from Ø12mm to 250mm (~0.5″ to 9.8″).
The SRV Screw Tip family can be adapted to fit ANY injection molding machine. We have a robust drawing library of OEM cavities and valve envelopes; if we don’t have reliable dimensions for your machine, our team will work with you to confirm measurements and dimensions.
A new SRV non-return valve assembly is typically delivered within 4 weeks after your order is placed and fit dimensions are confirmed. We strive for fast, reliable turnaround with superior performance and quality.
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