Metal C-rings are made of a coil spring as an elastic element, which is covered with a thin metallic sheet such as aluminum sheet. Being elastic and rich in recovery and also able to offer sealing at low tightening forces, they can be used in the fields handling high temperature, ultra high vacuum, as well as in applications subject to very low temperature and high pressure, where rubber based O-rings can not be adopted.
- VALQUA No.
- Product name
- Trypack Single layered products
- Metal C-rings are made of a coil spring as an elastic element, which is covered with a thin metallic sheet such as aluminum sheet.
- Being elastic and rich in recovery and also able to offer sealing at low tightening forces, they can be used in the fields handling high temperature, ultra high vacuum, as well as in applications subject to very low temperature and high pressure, where rubber based O-rings can not be adopted.
- Inappropriate fluid
- Used for semiconductor-related facilities, nuclear power-related facilities, electronic industry, laser equipment, joints, valves, injection molding machines, etc.
■ Available ranges
|Ultra high vacuum～7
The temperature ranges are for aluminum, and vary depending on component material used.
Temperature and pressure show individual service limit
■ Design data
|Cross sectional diameter（mm）
|Groove depth （mm）
|Required tightening force （N/mm）
|Silver & copper
|Nickel & tantalum
|Stainless steel & titanium
|Flange surface roughness（Ra）
■ Compression recovery characteristics of Trypack （No.3645）
■ Component materials
■ Component materials ■
|Frequency of use
|◎：used often ○：used sometimes △：rarely used
■ Upon placing order
Q. I want to control the width of the opening in the flange such as with a sheet gasket. How should I do this?
A. Control with width of the opening in the flange is prone to cause a margin of error and an accurate tightening stress cannot be obtained. It is effective for uneven tightening, so please use it in conjunction with control of tightening torque.
Q. JPI basically quotes from ASME/ANSI, so there are cases in which the dimensions differ slightly due to rounding error during the millimeter conversion of the original number. We understand that, in actual use, the function of the gasket is fulfilled to an equivalent degree by both dimensions.
A. Why does leakage occur during stop or re-operation even though there are no problems during plant operation?
Q. Expansion and contraction of the flange, bolt, pipe and the like will occur due to temperature changes. As a result, a tendency of reduced tightening force in the gasket main unit is often observed when the temperature decreases (including low temperature at the time of initial re-operation), and leakage occurs due to relaxation. We therefore generally recommend a retightening of the gasket before re-operation after the first heat addition.
A. Is retightening effective when leakage occurs?
Q. Yes, it is effective. We ask that retightening during leakage be performed after relieving internal pressure. However, there are also points to keep in mind for each product, such as the possibility of damage as a result of temperature-induced hardening in the case of a compressed non-asbestos fiber sheet.
Q. I am not sure which gasket to select, so could you select it for me?
A. If you contact us together with your operating conditions, we will recommend an appropriate product based on our technician's selection.
■ VALQUA HAND BOOK DIMENSIONAL DATA