JIS20K flange swing type flange check valve

JIS20K swing check valve structure

The H44W-20K JIS20K flange swing check valve adopts a swing valve disc structure. When the medium flows forward, the valve disc opens. When the flow rate decreases or there is a trend of reverse flow, the valve disc closes to restrict the backflow of the pipeline medium.

How to understand the pressure level of JIS20K?

JIS 20K belongs to the pressure rating representation in the Japanese standard system. The actual pressure and temperature ratings are related to the main material, design temperature, and specific standards used. JIS20K cannot be directly fixed as equivalent to a certain PN grade, Class grade, or fixed MPa value.

The material shall be based on the current parameters and order

SCPH12, SCS13 and SCS14 are separate material options with different corrosion resistance and pressure–temperature characteristics. Select the body and internal materials for the process conditions and document the chosen combination in the order.

Precautions for selecting Japanese standard flanges

When selecting JIS20K products, it is necessary to confirm the diameter, flange size, bolt holes, sealing surface, medium flow direction, and installation space. Even if the nominal diameter is the same, it cannot be assumed to be directly interchangeable with the matching flanges of the PN or Class systems.

JIS10K swing type product can be referred toJIS10K Japanese standard swing flange check valveFor more check valve products, please refer toManufacturers and Selection of Check Valves。

Frequently Asked Questions

Can JIS20K be directly used as PN40?

It cannot be simply equated. The pressure and temperature rating rules, material groups, and flange dimensions of different standard systems need to be checked separately.

The material identification of H44W-20K is inconsistent with the order. How can we confirm if it can be replaced?

The valve body nameplate, material standards, furnace batch number, and material certification should be checked, and the actual brand should be confirmed before evaluating the temperature and pressure compatibility with the medium; SCPH12 cannot be replaced with SCPH2 without confirmation.

Can a swing check valve block in both directions?

The main function of a check valve is to restrict the reverse flow of the medium, and ordinary rotary check valves should not be described as block valves that can be arbitrarily cut off in both directions.