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  1. Home
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  3. ハマイ 営業本部
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Industrial Machinery
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ハマイ 営業本部

EstablishmentFebruary 1, 1927
capital39500Ten thousand
number of employees314
addressTokyo/Shinagawa/7-7-7 Nishigotanda, SG Square 2F
phone03-3492-6655
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last updated:Jul 15, 2025
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ハマイ Product Lineup

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Brass ball valve Brass ball valve
Stainless steel ball valve Stainless steel ball valve
Ball valve for LP gas Ball valve for LP gas
Custom-made product (relief valve) Custom-made product (relief valve)
Automatic ball valve Automatic ball valve
Lockable ball valve Lockable ball valve
Oil-free ball valve Oil-free ball valve
[Materials] Useful Materials [Materials] Useful Materials
<用途別>医療用配管向け <用途別>医療用配管向け
<用途別>純水・水処理装置向け <用途別>純水・水処理装置向け
<用途別>産業用装置 <用途別>産業用装置
<用途別>車両・建設機械 <用途別>車両・建設機械
<用途別>工場配管・プラント向け <用途別>工場配管・プラント向け
<用途別>塗装装置向け <用途別>塗装装置向け
Custom-made

Custom-made product (relief valve)

This is a custom product (relief valve) designed from scratch to meet the user's requirements, with lot production carried out.

Custom-made valve for special orders and completely new designs.

We offer custom valve manufacturing with various optional features centered around ball valves.

At Hamai, we are capable of manufacturing custom-made valves that cater to various industrial machinery, equipment, and piping, centered around ball valves. We can accommodate not only simple parts replacements but also modifications to the main body shape and combinations of different standards, as well as fully customized designs to meet unique specifications. Special specifications such as heat resistance, pressure resistance, corrosion resistance, chemical resistance, oil-free design, and low environmental impact are also available. ■ Examples of Requests - Change in handle shape (lever handle/knob handle). - Change in handle opening direction (clockwise/counterclockwise). - Change in O-ring material (NBR/FPM, etc.). - Incorporation of different standard screws (Rc screws/G screws/NPT screws, etc.). - Modification of shape to fit in narrow spaces. - Compatibility with special fluids. - Integration of multiple ball valves used together. - Special oil-free design. - Addition of a locking function to prevent accidental operation, etc.

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Small-sized, low-pressure spring-type safety valve, relief valve, and blow-off valve.

Lot production is possible with set pressure and set temperature tailored to the user's needs.

■【Features】 Compact spring-type safety valves, relief valves, and blow-off valves. We can produce them in lots with pressure and temperature settings tailored to user needs. Materials available are brass and stainless steel, with connection diameters ranging from 06A to 20A (1/8B to 3/4B). Additionally, we can accommodate a wide range of set pressures from 0.3 to 1.10 MPa. (*For other thread standards, materials, or set pressures, please consult our sales department.) ■【Product Quality Recognized by Professionals】 Hamai's ball valves have a proven track record of mass supply (OEM) to various major manufacturers, making them top-class high-performance ball valves in the industry for various industrial equipment and machine tools. They are adopted as genuine parts by various companies, and we respond to all needs for ball valves with the highest product quality. ★【Custom Orders / Made-to-Order Available】 For more details, please contact our [Tokyo Headquarters] at TEL(03)-3492-6655 <Receptionist / Second Sales>.

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Custom-made spring-type safety valve, relief valve, and blow-off valve.

Custom manufacturing is also available for small diameter pipes (8A, 10A)! We can produce made-to-order products tailored to the user's needs in terms of material, diameter, pressure, and temperature. <Made in Japan>

We realize custom manufacturing of spring-type safety valves, relief valves, and blow-off valves tailored to the needs of our users. You can choose from materials such as brass and stainless steel, and we can accommodate a wide range of specifications for connection diameters and set pressures. Thanks to Hamai's latest valve technology, these products are produced in our domestic factory. ■【Features】 - Materials available in brass and stainless steel, with connection diameters ranging from 06A to 20A (1/8B to 3/4B) - Set pressures can be accommodated from 0.3 to 1.10 MPa, with a wide range of options available (*For other thread standards, materials, or set pressures, please consult our sales department.) ■【Product Quality Recognized by Professionals】 Hamai's ball valves have a proven track record of mass supply (OEM) to various industrial equipment and machine tools, primarily for major manufacturers, making them top-class high-performance ball valves in the industry. They are adopted as genuine parts by various companies, meeting all needs for ball valves with the highest product quality. ★【Custom Orders / Customization Available】 For more details, please contact our [Tokyo Headquarters] at TEL 03-3492-6655 <Second Sales Department>.

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