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The "Super Check" is a check valve consisting of two semicircular disc-shaped bodies attached to a valve box by a single hinge pin along with a spring (JIS B 0100). When fluid flow occurs, each disc opens fully to the stop pin around the hinge pin. Additionally, when the flow from upstream stops, the discs close due to the spring force and seat on the valve box seat to stop the flow. 【Features】 - Compact dimensions for easy installation and removal in piping - Lightweight, contributing to reduced burden on operators - Simple structure for easy maintenance - A wide variety of material combinations for the valve box, disc, and other parts - Cylindrical valve box design suitable for high pressure structurally *For more details, please refer to the documentation. Feel free to contact us with any inquiries.

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Our company has extensive experience with refrigerants (such as ammonia and fluorocarbons) for manufacturers of refrigeration equipment. In some cases, we receive requests to use refrigerant pipe flanges (JIS B8602) on the opposing flange, and we have numerous examples of responding by machining grooves on the flange surface of check valves. This document includes information on "Refrigerant Pipe Flange Compatibility" and "Case Studies." Please feel free to download and review it. Additionally, we also provide compatibility for flanges used in vacuum devices on vacuum lines for vacuum pumps. *For more details, please refer to the PDF document or feel free to contact us.

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Our Super Check (dual plate check valve) has a very simple product structure, resulting in a much shorter face-to-face length and lighter weight compared to other types of check valves. Therefore, it is very suitable for installation in places where sufficient piping space cannot be secured. This document includes a performance comparison between dual plate check valves and swing check valves. Please download and take a look. [Contents] ■ Performance comparison between dual plate check valves and swing check valves ■ Comparison of JIS 10K cast iron valves ■ Face-to-face comparison diagram of dual plate and swing check valves *For more details, please refer to the PDF document or feel free to contact us.

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The "SUPER LITE (Insert Type)" is a single plate check valve designed based on the API 6D standard. It has an even shorter face-to-face dimension than a standard wafer check valve (dual plate type). It is compact and contributes to piping space. It is designed for use in low-pressure lines such as blowers and fans, and has received positive feedback from many blower manufacturers. 【Features】 ■ Designed based on the API 6D standard ■ Even shorter face-to-face dimension than a standard wafer check valve (dual plate type) ■ Contributes to piping space *For more details, please refer to the PDF document or feel free to contact us.

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Introducing case studies of check valves (non-return valves) delivery! Our product "Super Check" has a proven track record for special fluids. [Contents] ■ Ammonia - Applications for refrigerants by domestic refrigeration manufacturers ■ Hydrogen - Applications for hydrogen production equipment by domestic chemical companies ■ Oxygen - Oxygen lines for domestic steel mills and gas companies ■ Geothermal Water - Projects related to geothermal power generation in Japan *For more details, please download the PDF or feel free to contact us.

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Introduction of special cases for dual plate check valves. A check valve (non-return valve) is a valve installed downstream of pressure-generating devices such as pumps to prevent backflow. The valve body opens due to fluid pressure or flow rate, and closes due to a decrease in pressure or flow rate, preventing backflow through spring torque. [Contents (excerpt)] ■ Maximum nominal diameter 1350A Delivered a stainless steel valve with a nominal diameter of 1350A to a seawater desalination plant in the Middle East. * It is also possible to manufacture valves with a nominal diameter of 1350A or larger. Please contact us for details. ■ Maximum nominal pressure 620K (design pressure 63MPa) special flange Designed and delivered products in accordance with the flange standards specified by a domestic steel company from scratch. Additionally, bolts, nuts, and flanges were also designed, manufactured, and delivered by our company. * For more details, please refer to the PDF document or feel free to contact us.

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The seat of a center-shaped butterfly valve is usually fitted into the body by twisting the formed rubber. Since it is not bonded or glued, is there any concern about deformation of the rubber seat when used in a negative pressure line? If there is a possibility that the rubber seat may be affected in a high vacuum line, bonding (gluing) the rubber seat to the body allows it to be used without any issues in a negative pressure line. Additionally, there is a water seal method that connects piping to the ground part and uses water instead of a ground packing for sealing. *For more details, please refer to the PDF materials or feel free to contact us. *We also have other technical materials available.

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The center-mounted butterfly valve is essentially made of a rubber sheet. The rubber sheet plays important roles such as "sealing on the primary and secondary sides," "sealing in the ground area," and "acting as a gasket." However, there may be cases where it cannot be used depending on the fluid and temperature. We offer sheets that meet your specifications, such as VITON, which has excellent heat resistance, and NBR, which has excellent oil resistance. *For more details, please refer to the PDF materials or feel free to contact us. *We also provide other technical materials.

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Butterfly valves are commonly used in seawater lines for cooling pumps at power plants, ship-side valves in shipbuilding, and seawater desalination. In this case, since the seawater comes into contact with the disc, it is necessary to select materials with excellent corrosion resistance. The butterfly valves we handle (manufactured by Value Valve) can be equipped with rubber lining for seawater resistance. *For more details, please refer to the PDF materials or feel free to contact us. *We also have other technical materials available.

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We would like to introduce the butterfly valves handled by Astam Co., Ltd. We offer a wide range of products, including the "centered rubber seat butterfly valve," which can accommodate various flange standards, as well as the "double eccentric butterfly valve" and "triple eccentric butterfly valve," designed in accordance with API594 and ASME B16.34. If you are looking for butterfly valves, please feel free to leave it to us. 【Product Lineup】 ■ Centered rubber seat butterfly valve ■ Double eccentric butterfly valve ■ Triple eccentric butterfly valve ■ Double eccentric rubber seat butterfly valve *For more details, please refer to the PDF materials or feel free to contact us.

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We would like to introduce some frequently asked questions from everyone. As a dedicated manufacturer of check valves, our long years of experience and achievements have earned us the trust of our customers. We will continue to provide products and services that meet your satisfaction in terms of performance, quality, price, and delivery time. [Content] ■ What are the benefits of using Value Valves through Astam? ■ Is it possible to have someone come to the site for trial adjustments or regular maintenance? ■ Can you manufacture products in sizes or pressure ratings not listed in the catalog? And many more. *If you have any other questions, please feel free to contact us.

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The "Super Light" is a check valve with a disc-shaped valve body fixed at the top of the main body, which opens and closes in response to changes in fluid pressure and flow rate. Being lightweight and compact, it is much cheaper in terms of maintenance and installation compared to traditional swing check valves. Its very simple structure provides excellent versatility. Due to its sandwich shape, it is installed by inserting it between the mating flanges of the piping and tightening it with bolts. 【Features】 ■ Simple design consisting of only 5 parts ■ Lightweight and compact type check valve ■ Easy to install due to short face-to-face dimensions ■ The outer diameter matches the inscribed circle of the mounting bolts, providing good workability and cost-effectiveness ■ No special support is required *For more details, please refer to the external link page or feel free to contact us.

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【Features】 ■ Small gap dimensions ■ Lightweight ■ Simple structure ■ A wide variety of material combinations for valve boxes, valve bodies, and individual parts ■ Suitable for high pressure due to the cylindrical shape of the valve box *For more details, please download the PDF or feel free to contact us.

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Astam's valves boast high-quality performance on a global scale. Among them, our flagship product, the check valve (non-return valve), addresses all the issues associated with traditional swing check valves. We would like to introduce the features of our pride, the Astam check valves (non-return valves), namely the 'Astam Super Check' and 'Astam Super Light'. [Contents] - Elimination of water hammer - Compact design with a short face-to-face size - Easy installation and removal - No restrictions on installation direction - Valve opening and closing operates normally at all times - Low pressure loss *For more details, please refer to the PDF document or feel free to contact us.

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Introducing the "Center Type Rubber Sheet Butterfly Valve" compatible with various flange standards. 【Features】 ■ No restrictions on flow direction ■ Compatible with vacuum lines, etc. *Special adaptations available ■ Manual valves (lever, gear) and automatic valves (electric, pneumatic) available ■ Compatible with various flange standards ■ Certified by various marine classifications ■ Available with various types of rubber sheets, including FKM, for high-temperature applications *For more details, please refer to the PDF document or feel free to contact us.

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The "VF-9 Series" is a double eccentric butterfly valve designed in accordance with API594 and ASME B16.34. The metal seat and long bonnet specification has a maximum heat resistance temperature of 500°C and can accommodate vacuum applications such as water seals. Additionally, the manufacturing range (nominal diameter) is up to 600mm, with low-temperature compatibility down to -100°C, and it can accommodate special materials (such as duplex stainless steel). 【Features】 ■ Designed in accordance with API594 and ASME B16.34 ■ Manufacturing range (nominal diameter) up to 600mm (maximum production record of 1200mm) ■ Heat resistance temperature up to 500°C * Metal seat, long bonnet specification ■ Low-temperature compatibility down to -100°C * Special compatibility ■ Capable of vacuum applications such as water seals * Special compatibility * For more details, please refer to the PDF document or feel free to contact us.

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