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Useful information
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Q&A
Q&A
Flexible joint
General
- About the length of the bolt used
- Please refer to the product specification PDF from the product page.
- Are there JIS standards for flexible joint?
- There are no JIS standards for flexible joints.
- Please tell me the type of plating
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The surface treatment of our flange fittings is electrogalvanized, hot-dip galvanized, or silver painted.
The surface treatments for our threaded fittings is electrogalvanizing, hot-dip galvanizing, chrome plating, and silver painting.
- Can flexible joints expand and contract?
- Flexible joints are designed to absorb displacement in the vertical direction, but cannot absorb expansion and contraction in the axial direction. If you need to absorb expansion and contraction in the axial direction, please use an expansion joint.
- Do you have any products with core flanges?
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Products with core flanges are not available in the lineup.
Only products with core unions are not available. (Z-9000CAW)
- Do you have any products with insulation flanges?
- Products with insulating flanges are not available in the lineup.
- Is it possible to order product length in mm?
- Tolerances are set for product length . We will manufacture the product based on the product length specified by you, but please be aware that there may be variations within the tolerance.
Stainless steel product
- Differences between Z-9000 and Z-9000NW (about welded and non-welded structures)
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There is a difference in the method of assembling the bellows and union joint between Z-9000 and Z-9000NW.
Z-9000 uses welding to incorporate the bellows (welded structure), but Z-9000NW does not use welding (non-welded structure).
Products with a welded structure are not suitable for piping that is subject to vibration or repeated movements, but there are many types of fittings that can be incorporated, and long length products can also be manufactured.
On the other hand, products with a non-welded structure have restrictions on the type of joint and product length, but they can also be used in piping that is subject to vibration or repetitive motion.
- Z-Difference between Z-10000 and Z-10000NW (about welded structure and non-welded structure)
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There is a difference in the method of assembling the bellows and union joint between Z-10000 and Z-10000NW.
Z-10000 uses welding to incorporate the bellows (welded structure), but Z-10000NW does not use welding (non-welded structure).
Products with a welded structure are not suitable for piping that is subject to vibration or repeated movements, but there are many types of fittings that can be incorporated, and long length products can also be manufactured.
On the other hand, products with a non-welded structure have restrictions on the type of joint and product length, but they can also be used in piping that is subject to vibration or repetitive motion.
- Does Stainless steel flexible joint have a service life of product?
- The product lifespan (service life) varies depending on various factors (temperature, pressure, installation conditions, etc.), so it cannot be stated with absolute certainty.Generally speaking, we believe approximately 10 years as a guideline for replacement.
- Is there any problem with galvanic corrosion?
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Galvanic corrosion(potential difference corrosion) occurs when metals with different potentials (dissimilar metals) come into contact.
It is said that the greater the potential difference, the more likely corrosion occurs, so the degree of corrosion will vary depending on the type of metal in contact. In addition, it is affected not only by the potential difference but also by various factors such as the surrounding environment, so there are many cases where the effect is small in principle even if different metals are combined, and there are cases where the actual harm is small even though it is quite dangerous in principle. There are also combinations of dissimilar metals that have been used in real life and have shown sufficient durability.
The combination of stainless steel and brass/bronze has a small potential difference, so there is almost no concern about galvanic corrosion. When stainless steel and iron are combined, stainless steel is a (noble) metal and iron is a (base) metal in terms of potential, so the iron will corrode. However, in cases where stainless steel is used in some parts of iron piping, the surface area of the (base) metal is large, so it may be hardly affected by galvanic corrosion.
- Can I change the gasket included with Z-3000 to a commercially available gasket?
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The Z-3000's gasket contact surface has special dimensions, so there is a risk of leakage with commercially available gaskets.
Please be sure to use the included special gasket.
- What are the typical liquids that can and cannot be used?
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When using stainless steel flexible, corrosion may occur if the fluid is not always full or contains foreign matter or impurities.
The most typical corrosion factor for stainless steel is chloride ions. Corrosion can occur in fluids with high concentrations of chloride ions.
Please refer to the corrosion resistance table, which is also available.
Ruber product
- Does rubber flexible joint have a service life of product?
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The product lifespan (service life) varies depending on various factors (temperature, pressure, installation conditions, etc.), so it cannot be stated with absolute certainty.Generally speaking, we believe approximately 10 years as a guideline for replacement.
In the polymer series catalog, the coefficients for calculating the service life (estimate) are listed . Please check for reference.
- Does Rubber flexible joint have a weather resistant?
- We use EPDM, which has high weather resistance, for our rubber products. However, if it is installed outdoors and used in an environment where it is exposed to UV rays for a long period of time, deterioration due to UV rays is inevitable.If possible, please take measures such as racking to avoid direct sunlight.
- Can the product length of rubber flexible joints be changed?
- Product length of rubber flexible joints may or may not be changeable. Please contact us for details.
- What are the typical liquids that can and cannot be used?
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If a high temperature fluid is used, it may cause thermal deterioration.Also, it cannot be used for air piping.
Please refer to the corrosion resistance table , which is also available.
Fluororesin product
- Is gasket required for ZTF-2000PH?
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ZTF-2000PH has a sealing surface formed by folding the tube (fluororesin), so it can be sealed without a gasket, but there is a risk that the sealing surface on the product side may be damaged due to scratches on the sealing surface on the piping side.
If so, we recommend preparing and using a separate gasket.
Vinyl chloride product
- Can ZEV-1000 be used for water supply piping?
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ZEV-1000 cannot be used for water supply piping.
For drainage only.
Vibration absorber
General
- What are the typical liquids that can and cannot be used?
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As a rule, the fluid that can be used for vibration isolation joints is water.
For normal temperature, use rubber (ZRJ-B/ZRJ-T), stainless steel (A･V･JOINT ), or fluororesin (ZTF-5000).
For hot water and hot water supply piping, use stainless steel (A･V･JOINT ) and fluororesin (ZTF-5000).
- Can it be connected to a butterfly valve?
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If the dimensions of the valve disc are smaller than the inner diameter of the flexible joint, connection is possible, but if the dimensions of the valve disc are larger than the inner diameter of the flexible joint, interference may occur.Please check the dimensions of the valve body and the inner diameter of the flexible joint.
Stainless steel product
- What temperature can A･V･JOINT high temperature type be used up to?
- The applicable temperature range of A･V･JOINT high temperature type is room temperature to 150℃.
Rubber product
- Is it possible to manufacture ZRJ-B/ZRJ-T with 5KF?
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ZRJ-B/ZRJ-T with 5KF cannot be manufactured.
ZRJ-E1 and ZRJ-E2 can be manufactured.
- Can the product length of ZRJ-B/ZRJ-T be changed?
- The product length of ZRJ-B and ZRJ-T cannot be changed.
- Can ZRJ-B/ZRJ-T be used for drinking water piping?
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ZRJ-B and ZRJ-T can be used for drinking water piping. (Japan water association certified registered product)
*ZRJ-T certified and registered by the Japan Water Society is available up to 150A.
- Can ZRJ-B/ZRJ-T be used for cold and hot water generators?
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Cold and hot water generators can become hot during heating operation.
Therefore, it cannot be used at the entrance/exit of the “cooling water piping” of cold and hot water generators.
Please use A･V･JOINT or Z-3000.
*ZRJ-B/ZRJ-T can be used for “cooling/hot water piping” of cold and hot water generators. Please check the operating temperature and applicable temperature range of the product.
- Does rubber vibration absorber have a service life of product?
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The product lifespan (service life) varies depending on various factors (temperature, pressure, installation conditions, etc.), so it cannot be stated with absolute certainty.Generally speaking, we believe approximately 10 years as a guideline for replacement.
In the polymer series catalog, the coefficients for calculating the service life (estimate) are listed . Please check for reference.
- Does rubber vibration absorber have a weather resistant?
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We use EPDM, which has high weather resistance, for our rubber products.
However, if it is installed outdoors and used in an environment where it is exposed to UV rays for a long period of time, deterioration due to UV rays is inevitable.If possible, please take measures such as racking to avoid direct sunlight.
- Can the product length of rubber flexible joints be changed?
- Product length of rubber flexible joints may or may not be changeable. Please contact us for details.
- What are the typical liquids that can and cannot be used?
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If a high temperature fluid is used, it may cause thermal deterioration.
Also, it cannot be used for air piping.
Please refer to the corrosion resistance table, which is also available.
Fluroresin product
- Can ZTF-5000 be used for cold and hot water generators?
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Cold and hot water generators can become hot during heating operation.
Therefore, it cannot be used at the entrance/exit of the “cooling water piping” of cold and hot water generators.
Please use A･V･JOINT or Z-3000.
*ZTF-5000 can be used for “cooling/hot water piping” of cold and hot water generators.
Please check the operating temperature and applicable temperature range of the product.
Expansion joint
General
- Do you have any standard products of expansion joint?
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Expansion joints are in principle made-to-order.
We design and manufacture according to the customer's required specifications.
Heat exchanger
General
- What kind of heat exchanger do you manufacture?
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We manufacture shell-and-tube, U-tube, plate type, and immersion type for liquid-liquid and steam-liquid heat exchange.
( List of heat exchanger products )
- Is it possible to manufacture a heat exchanger that comply with applicable regulations for pressure vessels, etc.?
- Our heat exchangers are limited to use outside of legal regulations, so we cannot provide products that comply with legal regulations.
