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Frequently Asked Questions

  Rupture Discs   HV and UHV Gate Valves
 

Rupture Discs

Where is production site for Rupture Disc?
In our own factory in Japan. (Hitachinaka, Ibaraki Prefecture)
 
What is a guarantee period?
Regular guarantee period is 12months after delivery.
 
What information is required for ordering spare discs?
Please inform us VTEX drawing No. or Management No. on package box.
 
What is the advantage of V TEX Rupture Disc compare to other Rupture Disc manufacturer?
Performance and quality is our advantage. It is proven as our Rupture Disc are officially adopted to various nuclear power plants. Also our flexible service provision by constant process of ordering, designing and manufacturing in Japan is the advantage that only V TEX can offer.
 
Can V TEX design engineer attend at the meeting?
Yes, V TEX design engineer specialized in Rupture Disc can attend at the meeting.
 
What is standard lead-time?
V TEX regular lead-time is 30days for spare discs and 45days for holder and disc set. Please consult us if short lead-time is required.
 
Does V TEX have any stock of standard items?
We mainly manufacture made-to-order products for customer-specialized specification. We don't have many stocks of standard items.
 
Can I purchase spare disc for 1 piece?
V TEX offers 4 pieces per 1 set for standard spare disc set. Please contact us for price if you need 1 piece.
 
Can I purchase component part?
Yes, component part is available for purchase.
 
What is the difference between Rupture Disc and relief valves (safety valves)?
While relief valves possesses likelihood of failure, rupture discs are confirmed to relief pressure at specified pressure. However, while rupture discs have no reseating pressure and hold open until fluid is empty, relief valves have reseating pressure and it will close and stop fluid release as pressure lowers the specified pressure.
 
What is the available maximum size of the Rupture Disc?
Maximum size of Rupture Disc differs depending on the model. V TEX has proven record of maximum of 900 dia. Please contact us for more information.
 
What is lifetime or replacement cycle of Rupture Disc?
(It has been more than several years that Rupture Disc had not burst Should the disc be replaced?)
Even Rupture Disc has not burst under normal operating condition, V TEX recommends to replace Rupture Disc every year from safety standpoint.
 
What would be the issue if disc is not replaced after recommended replacement cycle.
Disc is prone to aging degradation, it may not satisfy the specification and performance at production, and disc may burst below the specified pressure.
 
Is volume discount available?
Please contact us for details.
 
Can we order from outside of Japan?
Normally we take orders from outside of Japan through trading company. Please contact us for details.
 
Is document available only in Japanese?
V TEX offers English, Korean, and Chinese language document. Please contact us for other language.
 
Does V TEX offer special specification?
We will provide proposal that will best fit customers' request. Please contact us for details.
 
What are laws and regulations regarding Rupture Discs?
High Pressure Gas Safety Act, Construction Code for Pressure Vessels, etc.
 
What happens if fluid contacts the reverse buckling type disc?
In case fluid contacts the disc, it may affect its bursting pressure, however, if the fluid is misty or as particle, it will not happen.
 
Will V TEX take special request for connection type?
V TEX may come up with the solution. Please contact us for details for review.
 
Does V TEX have experience with special materials Rupture Disc?
V TEX has manufactured Rupture Disc made of Tantalum and Inconel for use of highly corrosive fluid.
 
I want to change operating specification after using Rupture Disc for some time. What would happen?
Disc may need to be changed to satisfy the operating specification. Please contact us for details.
 
I have holders made by different manufacturer. Can V TEX make disc that fits to the holder?
V TEX may come up with the solution. Please contact us for details.
 
Holder seems to be heavy. Can V TEX make it lighter or change material? Is there improvement plan?
It is difficult to reduce weight of holders. There is other types that disc can be directly installed to flanges. Please contact us for details.
 
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HV and UHV Gate Valves

Can V TEX take a special specification order?
We have been manufacturing a lot of products with special specifications.
Please inform us of the specification request. We will review to make it feasible.
 
Does V TEX have any stock of standard valves?
We mainly manufacture made-to-order products for customer-specialized specification. We don't have many stocks of standard valves.
 
What sizes can V TEX manufacture?
We have manufactured various sizes of slit valves from 200mm Wafer to G8 glass substrate, and gate valve (round-shaped port) to 500mm dia.
 
What is the requirement items for ordering new valve?
Port Size, Operating pressure, fluid, and temperature.
Please refer to "How to order - from inquiry to delivery."
 
What is a guarantee period of V TEX's products?
Regular guarantee period is 12months after delivery.
 
Is installation surface (connection to chamber) specified?
V TEX can adopt customer's chamber connecting surface. V TEX may offer preferred surface connection in order to avoid deformation at vacuum.
 
What are the meanings of "positive pressure," "back pressure," and "equal pressure (same pressure)"?
Positive Pressure: Vacuum pressure force is added to sealing force (vacuum force direction and sealing direction is the same)
Back Pressure: Vacuum pressure direction and sealing force direction is opposite.
Equal Pressure (Same Pressure):Pressure on the both sides of sealing gate is same. (e.g. chamber pressure of front and back side of the valve is equal)
 
What is the Helium leak rate of valve?
Regular Helium leak rate is not more than:
Gate seal:9×10^-11[Pa・m^3/s]
Body seal:4.0×10^-11[Pa・m^3/s]
 
What is the robustness? (Cycle Times)
For transfer valves that are operated (open-close) frequently, regular cycle life is 1 million cycles.
For gate valves (for evacuation) that are not frequently operated, regular cycle life is 300,000 cycles.
 
What is operating temperature?
90C for Gate and 60C for Actuator is V TEX Standard Specification.
Also V TEX has proven record of 150C for Gate and 120C for Actuator.
 
What is the meaning of "Differential Pressure in Opening Direction?"
Pressure difference between both sides of Gate surface at Gate opening and closing.
 
Can the valve hold closed mode (sealing performance) in case CDA is lost?
Yes. Our valve has close-hold feature either by holding by mechanical or air circuit.
 
Is repair and overhaul service available?
Yes, repair and overhaul service is available for V TEX valves.
V TEX may not be able to provide service for repair and overhaul directly depending on the tool type.
Please contact our sales representative directly or contact us from "web contact" form.
 
Is Price List available?
We mainly manufacture made-to-order products for customer-specialized specification and price list is not available.
We can provide approximate estimation with some items from specification request.
 
Is global support available?
V TEX has sales office and support service in Korea.
 
Can V TEX design engineer attend at the meeting?
Yes, V TEX design engineer can attend at the meeting.
To request our engineer to attend meeting, please contact our sales representative directly or contact us from "web contact" form.
 
Can we order from outside of Japan?
Yes, our international sales team will be of your service.
 
What is V TEX sales achievement and delivery record?
Since mid-1990's, V TEX has great deal of sales history and delivery record.
 
Where is manufacturing site?
At Tokai factory, Ibaraki Prefecture, Japan.
 
Can V TEX take component part orders?
In most cases it is difficult to support component part sales because there may be inconsistency. Please contact our sales representative directly or contact us from "web contact" form.
Also in most cases valves are under tool maker's OEM, and in such cases V TEX can not supply component part directly.
 
What is standard lead-time?
V TEX products are made-to-order and regularly it takes approximately 60 to 75 days for delivery.
Please consult us if short lead-time is required.
 
Can V TEX modify or repair other valve maker's valve?
We can not support other maker's valves. If you have concerns or troubles over valves, we may offer some ideas for resolution.
 
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Rupture Discs
HV and UHV Gate Valves
 
 
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Procedures for ordering
List of Specifications