- Burst plugs for reliable pressure relief in plastic extrusion systems
- Dynisco BP420 for emergency relief of excessive process pressure
- Rupture disk opens at a specific predetermined burst pressure
- Welded one-piece assembly with no degradation of joint strength
- Inconel rupture disk for stable performance over a wide temperature range
- Burst pressure ranges from 1,000 to 15,000 psig
- Accuracy of ±10 % of rated burst pressure at 300...399 °C / 572...750 °F
- Leak rate exceeds 1 × 10-6 standard cm³/s
- Each unit is tested at rated burst pressure and temperature
- 1/2-20 UNF-A process connection
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- Burst plugs with integrated burst indication for reliable pressure relief
- Dynisco BP520 as custom assembly for extruder barrel installations
- Designed as an emergency pressure-relief system for overpressure conditions
- Pop-top burst indicator signals a burst event to the control system
- Welded one-piece assembly with no loss of joint strength
- Inconel rupture disk for stable performance over a wide temperature range
- Burst ratings from 750 to 15,000 psig available
- Burst tolerance ±10 % with typical standard deviation ±1 %
- 100 % leak tested and 100 % electronic thread verification
- 1/2-20 UNF-A process connection
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- Signal conditioner for strain gauge sensors with DC output
- RT350 model for remote transmission of strain gauge signals to control systems and data loggers
- Optically isolated and amplified DC output
- Field-selectable input and output ranges
- Easy zero and span adjustment directly at the control panel
- Integrated diagnostic LEDs and convenient shunt calibration switch
- Suitable for data acquisition, process monitoring and control systems
- Supports several output signals including 0...10 V, ±5 V, 0...20 mA and 4...20 mA
- Operating temperature range from -10...60 °C
- Compact design for easy integration into existing systems
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- Digital melt pressure indication and alarm instruments for demanding polymer processing applications
- Rugged all-welded stainless steel construction for harsh process environments
- Integrated dual 5-digit LED display for pressure and optional temperature
- Digital auto-zero and peak display function included as standard
- Available either as a pure indicator unit or as an alarm version with relays, remote functions and retransmission outputs
- Process connections available in 1/2-20 UNF or M18
- Pressure ranges up to 15,000 psi or up to 20,000 psi depending on version
- Engineering units available in PSI, bar, MPa or kg/cm²
- Optional temperature measurement and temperature compensation available
- Ideal for local indication, alarm monitoring and signal transmission to DCS or PLC systems
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- Mechanical pressure gauge for direct local pressure readings
- PG4 Series for simple and maintenance-free melt pressure indication
- Mechanical design without external power supply
- Pressure ranges up to 0...5,000 psi or 0...10,000 psi
- Sealed diaphragm design helps prevent melt contamination and gauge plugging
- Rigid snout or flexible stem versions for different installation requirements
- Gauge head rotates 300° on the rigid snout version
- Maximum diaphragm temperature 400 °C
- Stainless steel case with safety glass
- Standard wetted parts made of TiN coated 15-5 PH stainless steel
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Rupture Disks & Measurement Devices – Dynisco
Under “Rupture Disks & Gauges,” Dynisco offers safety and pressure-relief devices for industrial processes. A rupture disk (or “burst plug”) is a passive over-pressure protection: when the system pressure (or a combined pressure/temperature threshold) is exceeded, the thin metal membrane bursts and instantly relieves the pressure. This safeguards machines, process lines and personnel against dangerous overpressure or sudden pressure spikes — commonly used in plastic extrusion, injection molding, chemical or process plants.
In addition to passive protection, Dynisco provides associated pressure gauges or transmitters allowing continuous monitoring of operating pressure. Thus, users can detect critical conditions early or verify that everything operates within safe limits — combining rupture-safety with active surveillance and measurement.
Questions & Answers on Rupture Disks & Measurement Devices
What is a rupture disk / burst plug?
A safety device consisting of a thin metal membrane designed to rupture at a predetermined pressure (or pressure/temperature combination), providing immediate pressure relief if the threshold is exceeded.
Where are rupture disks used?
In pressure vessels, pipelines, extruders, injection-molding systems, chemical reactors or any pressure-driven process where overpressure or sudden pressure spikes must be safely relieved.
Why use a rupture disk instead of a relief valve?
Rupture disks react extremely quickly, are maintenance-free, have no moving parts, do not require power and offer a highly reliable fail-safe protection — ideal for critical over-pressure protection or as backup to relief valves.
What pressure ranges are covered by Dynisco rupture disks?
Depending on the model, a wide pressure range — from moderate up to very high pressures — enabling use across many applications from extrusion to high-pressure processing.
How is a rupture disk constructed?
Typically a metal body with a thin, pre-stressed or scored membrane (e.g. made of Inconel or stainless steel). When the design pressure is exceeded, the membrane ruptures predictably, releasing the pressure. Variants include flat or domed membranes depending on the application's requirements.
What happens after activation of a rupture disk?
The process medium is vented or relieved through the opened disk; the disk itself is destroyed and must be replaced — it is a one-time safety device.
Why does Dynisco offer associated gauges or sensors?
Because pressure monitoring helps detect approaching critical conditions before the rupture disk needs to act — enabling preventive maintenance, process control and improved safety.
In which industries are such solutions used?
Plastic processing (extrusion, injection molding, blow molding), chemical and polymer processing, hydraulic systems, high-pressure reactors, and any industrial environment needing reliable overpressure safety and control.
What should be considered when using a rupture disk?
Correct selection of burst pressure (and possibly temperature rating), ensuring safe venting paths, replacement after activation, and adherence to safety requirements regarding venting, environment and pressure relief discharge.
Are rupture disks compatible with measurement devices?
Yes — when combined with pressure sensors, gauges or transmitters, the system allows both passive safety and active monitoring, giving a complete pressure control solution for industrial applications.