ケイヒン List of Products and Services

The "NSPW/NFFW series" is a constant flow valve (flow control valve) that can be used with water and other special fluids (such as seawater and corrosive fluids). It does not require a power supply or external operation, allowing for flow control with just this unit, which maintains a constant flow rate on the secondary side. Its simple structure ensures long life and high durability. It has a long track record in various devices, factory equipment, and oil plants. Additionally, a low flow type "FPC series" is also available. 【Features】 ■ Usable with water and other special fluids ■ Maintains a constant flow rate regardless of pressure differential changes before and after the valve ■ Simple structure ■ Achieves long life, high durability, and maintenance-free operation ■ Suitable for reducing environmental impact, such as water conservation measures and preventing overflow *For more details, please refer to the PDF materials or feel free to contact us.

The "FPC Series" is a valve that maintains a constant flow rate on the secondary side regardless of pressure fluctuations on the primary side. Due to its simple structure, it offers high longevity and durability. It is suitable for reducing environmental impact, such as water-saving measures and preventing overflows. We also offer a high flow rate type, the "NSPW/NFFW Series." If you are considering using it with special fluids other than water (such as seawater or corrosive fluids), please feel free to consult us. 【Features】 ■ Maintains a constant flow rate regardless of pressure differential changes across the valve ■ Simple structure ■ Achieves long life, high durability, and maintenance-free operation ■ Suitable for reducing environmental impact, such as water-saving measures and preventing overflows *For more details, please refer to the PDF document or feel free to contact us.

Our company offers a "constant flow valve" that supports both "long lifespan and high durability" due to its simple structure. No power supply is required. We have the "FPC series" for small flow rates and the "NSPW/NFFW series" that can handle flow rates up to 10,000 L/min. Currently, we are providing a "reference document" that includes explanations of features and functions, as well as case studies on the implementation of seawater desalination systems, oil refineries, and fire protection equipment. [Contents (excerpt)] ■ Structure and operating principle of the constant flow valve ■ Features and functions of the constant flow valve ■ Our product lineup ■ Case studies *You can view detailed information immediately from the [Download] section.

We offer a variety of valves that can achieve a constant flow rate regardless of pressure fluctuations. By receiving the fluid pressure with a piston and adjusting the passage area based on the balance with spring force, a constant flow rate can be maintained. Furthermore, since it is self-sustaining and can maintain a constant flow rate, there is no need for a power supply or system setup. We have a lineup of flow rates ranging from 0.7 to 2000 L/min (with separate consultation available for 2100 to 10000 L/min), suitable for water, oil, and other fluids. These valves are applicable for various uses, including ballast water treatment and tanker shipments. 【Features】 ○ Capable of maintaining a constant flow rate regardless of pressure fluctuations ○ Self-sustaining, eliminating the need for a power supply or system ○ Extensive lineup from 0.7 to 2000 L/min ○ Usable for water, oil, and other fluids ○ Available in various materials ● For more details, please contact us or download the catalog.

Have you ever been troubled by a sudden halt in valve production? For example… === Production of valves has suddenly stopped, both domestically and internationally… === The successor model lacks compatibility in specifications and dimensions, what should we do… At Keihin Co., Ltd., we manufacture valves that meet our customers' needs, regardless of temperature, material, pressure, size, or shape. Our "Special Valve Production Case Studies" includes numerous examples of special valves we have handled in the past. [Example of a production case] ■ Ultra-high pressure pneumatic operated piston valve → Special materials are used for the valve seat and needle section to enhance durability. ■ Spring return type electric ball valve for air conditioning (steam specification) → Maintenance can be performed while still connected to the piping. ■ Sack-back type pneumatic operated valve unit → Achieved larger sack-back systems, unitization, and improved maintainability. The downloadable materials only include a selection of products. For more details, please contact us.

When using metal valves in seawater, issues related to corrosion and durability inevitably arise, leading to a frequent use of resin valves, which are vulnerable to vibrations. In response, our company has developed metal valves for seawater that can be used for extended periods: "solenoid valves, flow control valves, and air release valves," achieving significant total cost reductions compared to resin. 【Countermeasure Introduction】 ■ Solenoid Valve: Diaphragm structure that blocks fluid entry to the movable iron core. ■ Flow Control Valve: Corrosion measures including a special coating on the spring. ■ Air Release Valve: Incorporates a ball in the valve body and our unique crystallization countermeasures. In addition to these three products, we also offer a variety of valves compatible with seawater and special fluids, including check valves! We are actively engaged in new product development and have established a system to assist you when you encounter difficulties. For more details, please refer to our catalog or feel free to contact us.

Are you having trouble finding a flange-connected valve, saying "there are only threaded products," or "I found a nipple flange on the internet, but the face-to-face distance is too long, and I can't secure enough piping space..."? Our company sells welded fittings that connect nipples and flanges with R × JIS 10K-FF connections as shown below. Please feel free to contact Keihin when you have any issues. ◆ Features - The face-to-face distance is short, at 39.5mm on one side (79mm for a set). *This dimension is for 25A. - We offer diameter sizes from JIS 10K-FF 15A to 25A. - We have two material options available: SS400 and SUS304.

At Keihin, we handle a variety of special valves that are not available from other manufacturers. Customization is possible to meet various conditions, such as accommodating high pressure, low temperature/high temperature, and changing materials according to the corrosiveness of the fluid. We can control fluids such as water, air, oil, and steam. Specifications that are difficult for other manufacturers can be consistently managed from design to production, responding to requests regarding fluid specifications such as fluid, pressure, and temperature, as well as material, connection, and size. 【Example of Products】*Customization is also available for catalog-listed items ■ Pneumatic Piston Valve 　⇒ Products compatible with 60 to 80 MPa ■ Solenoid Valve 　⇒ Products compatible with 20 MPa 　⇒ Products compatible with 250°C 　⇒ Products compatible with -196°C ■ Electric Valve 　⇒ Electric valve with a resin body material and spring return type (emergency shut-off valve) ■ Check Valve 　⇒ Products made of Hastelloy material ■ Others 　⇒ Various valves compatible with seawater 　⇒ OEM products for specific customers, etc.

Keihin's various valves, which are responsible for fluid control in all fields, are applied in a variety of areas. We will give away three comprehensive catalogs for free, featuring not only general products but also a wide range of special products. ■Electromagnetic Valve Comprehensive Catalog - Small general-purpose electromagnetic valves - Low, medium, and high-pressure general-purpose electromagnetic valves - Electromagnetic valves for high viscosity... ■Electric Valve Comprehensive Catalog - Small electric ball valves - Spring return type electric ball valves - Electric control valves... ■Automatic Valve Comprehensive Catalog - Constant water level valves - Needle type constant flow valves - High-performance check valves... *In addition to catalog products, we have many special products available, so please feel free to contact us. *If you would like the comprehensive catalogs, please request the materials or view the PDF data from the download section.