A.
All rupture disks are manufactured in our own facilities in Japan (Hitachinaka, Ibaraki).
Q.
Do you have designated distributors?
A.
We do not have exclusive distributors. Direct Orders are welcome, and we are also happy to work through a designated agent if preferred.
Q.
Would it be possible to arrange a factory visit or witness burst testing?
A.
Yes, factory tours and witnessed burst tests are available. All production is carried out at our Tokai Plant in Hitachinaka, Ibaraki.
Q.
What documents can be provided?
A.
The following documents are provided by default: structural drawings, inspection reports, and operation manuals. Additional documents, including relief capacity calculations, strength calculations, mill certificates, traceability certificates, and inspection procedures, are available upon request.
Q.
What is the standard lead time?
A.
Standard lead time is approximately 3 months for spare disks and 4 months for disk and holder assemblies. For urgent orders, expedited delivery may be available upon consultation.
Q.
Do you stock standard products?
A.
As our rupture disks are optimized to customer specifications, we do not maintain standard products in stock.
Q.
What information is required to order spare disks?
A.
Please provide either our drawing number, the MAKER JOB No. or MANAGEMENT No. shown on the packaging, or the identification number engraved on the holder.
Q.
Can I purchase a single spare disk?
A.
Yes, spare disks can be ordered individually. Please contact your sales representative or submit an inquiry via Contact Form for quotation.
Q.
Can I order individual components?
A.
Yes, orders for individual components are available.
Q.
Are volume discounts available?
A.
We offer volume discounts for larger orders. Please contact your sales representative or submit a Contact Form for details.
Q.
Do you accept orders from overseas?
A.
Yes, we have support bases in the U.S., Shanghai, and South Korea.
Q.
Are documents available in other languages?
A.
Yes. Documentation is available in English, Korean, and Chinese. Support for other languages may be available upon request. Please contact your representative or submit an inquiry via Contact Form.
Technical Considerations for Rupture Disks
Q.
Are there rupture disks certified under the High Pressure Gas Safety Act?
A.
Since rupture disks are not pressure-retaining components, there are no rupture disk products certified under the High Pressure Gas Safety Act; however, holders are eligible for certification testing.
※Please refer to Application of the High Pressure Gas Safety Act to Rupture Disks for further details.
Q.
Is burst pressure affected by operating temperature?
A.
Yes. Rupture disks function by utilizing the mechanical properties of metal, so any change in temperature will affect material strength and, consequently, burst pressure.
※Please refer to Burst Pressure Variation with Temperature for further details.
A.
The warranty period is 12 months from shipment.
Q.
What differentiates VTEX rupture disks from others?
A.
Our rupture disks stand out in terms of performance and quality — a track record proven by their adoption across multiple nuclear power plants. Because we handle everything in-house domestically, from order management and design through to manufacturing, we are able to offer flexibility in custom specifications, lead times, and pricing that other manufacturers cannot match.
Q.
Do you provide engineering support through meetings/technical discussions?
A.
Yes, rupture disk engineers are available for technical meetings.
Q.
What is the difference between a rupture disk and a safety valve?
A.
Unlike safety valves, which carry the risk of mechanical failure, rupture disks operate without malfunction and reliably release pressure at the specified set pressure, with no pre-activation leakage. Once a rupture disk bursts, it opens fully and remains open until all pressure is relieved - there is no reseating. A safety valve, by contrast, closes again once pressure drops below the set pressure, stopping the release of fluid.
Q.
What is the maximum size you can manufacture?
A.
This varies by model, but we have experience manufacturing rupture disks up to 1,000A. Please contact us or reach out via our Contact Form for further details.
Q.
Do you support custom specifications?
A.
We will work with you to find the best solution based on your requirements. Please contact your sales representative or submit an inquiry via the Contact Form.
Q.
What regulations apply to rupture disks?
A.
Applicable regulations include the High Pressure Gas Safety Act and Pressure Vessel Structural Standards.
Q.
What happens if a reverse-acting disk comes in contact with fluid?
A.
Contact with liquid may affect the burst pressure. Note that this may not apply if the fluid is in mist form.
Q.
Can you manufacture disks with special connection configurations?
A.
Yes. Please contact your sales representative or submit an inquiry via the Contact Form.
Q.
Do you have experience manufacturing from special materials?
A.
Yes. We have experience manufacturing disks using materials such as Tantalum and Inconel for highly corrosive fluid applications.
Q.
Can you manufacture a holder to match the dimensions of another manufacturer's holder?
A.
This may be possible in some cases. Please contact your sales representative or submit an inquiry via the Contact Form.
Q.
Can the holder be made lighter, or can the material be changed? Are there any plans for improvement?
A.
Weight reduction is possible upon request. We also offer a holderless design, where the disk is sandwiched directly between flanges.
Please contact your sales representative or submit the Contact Form for further details.
Rupture Disk Maintenance
Q.
Do rupture disks require inspection?
A.
Yes. Rupture disks are safety devices used in emergency situations, and periodic inspection must be performed to protect equipment and systems.
※Please refer to Inspection of Rupture Disks for further details.
Q.
Can rupture disks be reused?
A.
No, rupture disks cannot be reused. Once installed, stress is applied to the disk edge; reinstalling may introduce different stresses and affect burst performance.
※Please refer to Inspection Precautions for Reverse-Acting Rupture Disks for further details.
Q.
Are there specified gaskets between the holder and flange?
A.
Joint sheet gaskets, PTFE-enveloped gaskets, and PTFE gaskets with fillers are recommended. Gaskets susceptible to creep (cold flow), such as PTFE gaskets and rubber sheet gaskets, are not recommended. For spiral wound or metal gaskets, please consult us.
※Please refer to Gasket Selection for Use Between Rupture Disk Holders and Flanges for further details.
Q.
What is the recommended replacement interval or service life?
A.
As a safety precaution, we strongly recommend replacing rupture disks annually, regardless of condition.
Q.
What happens if a disk is used beyond the recommended replacement period?
A.
As disks deteriorate over time, they may burst at a lower pressure than their original set pressure.
Q.
What should be done if operating conditions change?
A.
The disk may need to be remanufactured according to the revised operating conditions. Please contact us for evaluation.
