Frequently Asked Questions

The capacity coefficient of a valve indicates a “coefficient that represents the capacity of flow at a given travel under certain conditions.” (From JIS B 0100, Glossary of Terms for Valves)
It is a coefficient that expresses something like the performance that allows fluid to flow through a valve under specified conditions such as the valve opening degree and the pressure difference before and after the valve (differential pressure). The Cv value is often used as one of the capacity coefficients. The larger the Cv value, the easier the fluid to flow.

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“Security trade documents” can be issued from our website.
Please click “Security Trade Document Issuance Service” and download the certificate of the target product.
When viewing or downloading, please use it after user registration.

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Since we sell maintenance parts, please contact your dealer for the scope of supply.

Please refer to the precautions described in the instruction manual of each type of valve.

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We do not have SDSs for the valves themselves, but we have SDSs for the valve parts seats, paints, and coating agents used during assembly. So, please contact your dealer.

We do not recommend to bury valves for installation. Prepare a valve box even when using a valve for burying.

Air can also be used, but please use the valve within the maximum allowable pressure of each product.

The mesh wire diameters and void ratios are as follows. (Inner mesh dimensions used by us)

・ Inner thread type
This type has a structure in which the threaded part is provided inside the valve (the part that comes into contact with water).
Since the height is lower than the outer thread type, this type has an advantage that the height of the valve chamber can be lowered.

・Outer thread type
This type has a structure in which the threaded part is provided outside the valve (the part that does not come into contact with water).
Because of the advantage that maintenance of the threaded part and parts replacement can be done easily, the outer thread type is used when the opening and closing frequency is high (electric operation, etc.).

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We do not recommend connecting the valves directly for piping.
Because of the valve structure, there is a possibility of interference as shown in the figure when passing bolts. Normally, a short pipe is sandwiched and the bolts are inserted from the pipe side, and the nuts are tightened on the valve side. Therefore, when installing a valve and a valve, be sure to use a short pipe to connect them for piping.

The Food Sanitation Law does not apply to a valve alone, but it stipulates the prohibition of metals containing lead and/or antimony, and prohibition of structures where copper and/or lead can be scraped for devices, containers and packages.
SDSs are available for non-metallic resin and rubber soft parts used in valves, so please contact your dealer.

Gate valves with non-rising structure (inner screw type) and quarter-turn valves (ball valves, butterfly valves) are applicable.

Basic information of “① Desired valve type, ② Connection method, ③ Size (nominal diameter), ④ Fluid operating temperature, ⑤ Fluid operating pressure, ⑥ Fluid name (including concentration and component values), ⑦ Material used for piping, etc.” is required.
In addition, please let us know the “use environment” and “application” as much as possible.

Since there is no product code described on the actual product, please contact your nearest sales office with “check items such as face distance, casted display, nameplate content” and, if possible, “images”.

Please contact a dealer of pipe materials that has business with your company.

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It is not recommended to use an EKE type drive part with electric stroke on one side and spring return on the other side, because the service life of the drive part will be significantly shortened due to the reduction in the repulsive force of the spring.
Please use it as an emergency shutoff valve or emergency relief valve.

Please identify the product and refer to the disassembly/assembly in each instruction manual.

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The characteristics of different valve structures are as follows.
Please select according to the method of use and piping environment.

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Bronze and stainless steel are close in electrical potential, so they can be connected.
According to a material issued by the Japan Stainless Steel Association, it is described as “there is no practical problem.” However, please note that we do not recommend for brass valves.

For gate valves and ball valves, when the fluid is liquid, a valve may be damaged due to increase of the internal pressure when the fluid is enclosed in the cavity part inside the valve casing when the valve is fully closed, and when it receives heat from the outside, or due to volume expansion that occurs when the fluid freezes. When such usage is known in advance, it is usually handled by providing a vent hole. However, note that the flow direction of fluid is restricted. Since globe valves have a structure without a cavity part, no vent hole is required.