MAEDA KOKI manufactures fluid-monitoring products for visual flow confirmation, approximate-flow observation and flow-switch signalling. This overview introduces its four product families and links to 38 detailed English product articles on this blog.
About MAEDA KOKI
Maeda Koki Research Institute is a Japanese manufacturer based in Kokubunji, Tokyo. The business began manufacturing and selling flow-detection products in 1963, and the company was established on 22 August 1966. Its activities focus on the manufacture and sale of fluid-monitoring equipment, including flow sights and flow switches.
The company uses integrated domestic production and quality management covering design, machining and inspection. Its products emphasize practical observation of fluid movement, with different constructions for oil, water and gas service. The appropriate unit depends on what the operator or control system needs to know about the flow.
Product Directory
- OIL SIGNAL — Oil Flow Monitoring — 16 articles
- WATER SIGNAL — Water Flow Monitoring — 11 articles
- AIR SIGNAL — Gas Flow Monitoring — 10 articles
- FITV — Multi-Branch Flow Indicators — 1 article
1. OIL SIGNAL — Oil Flow Monitoring
The oil range includes visual flow indicators, approximate-flow displays and contact-equipped flow switches. MKCM, MKAM and BSAM provide switching functions, while other constructions offer viewing, protective covers or adjustment valves. MKK variants serve copper-tube connections, MKC20-8-P addresses a reducer application, and MKD/MKDV allow observation of low-flow dripping. Select by the actual oil and viscosity as well as the required flow.
Detailed Product Articles
- MAEDA KOKI MKT OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKCM OIL SIGNAL — Oil Flow Switches, Models and Specifications
- MAEDA KOKI MKAM OIL SIGNAL — Oil Flow Switches, Models and Specifications
- MAEDA KOKI BSAM OIL SIGNAL — Oil Flow Switches, Models and Specifications
- MAEDA KOKI MKTV OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKCT OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKAT OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKCTV OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MK OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKC OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKA OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKK OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKK25-8-P OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKC20-8-P OIL SIGNAL — Oil Flow Indicators, Models and Specifications
- MAEDA KOKI MKD OIL SIGNAL — Drip Oil Indicators, Models and Specifications
- MAEDA KOKI MKDV OIL SIGNAL — Drip Oil Indicators, Models and Specifications
2. WATER SIGNAL — Water Flow Monitoring
The water range combines direct observation with optional flow-switch contacts or needle-valve adjustment, depending on the series. MKT, MKCT and related approximate-flow types use the position of an internal ball or float as a reference. MKCM, MKAM and BSAM are switching families. Match the water specification, operating conditions, connection and desired monitoring function before choosing a model.
Detailed Product Articles
- MAEDA KOKI MKT WATER SIGNAL — MKT25-1TW to MKT30-4TW Water Flow Indicators
- MAEDA KOKI MKCM WATER SIGNAL — MKCM TW-OFF and TW-ON Water Flow Switches
- MAEDA KOKI MKAM WATER SIGNAL — MKAM TW-OFF and TW-ON Water Flow Switches
- MAEDA KOKI BSAM WATER SIGNAL — BSAM TW-OFF and TW-ON Water Flow Switches
- MAEDA KOKI MKCT WATER SIGNAL — MKCT20-1TW to MKCT45-8TW Water Flow Indicators
- MAEDA KOKI MKAT WATER SIGNAL — MKAT20-1TW to MKAT45-8TW Water Flow Indicators
- MAEDA KOKI MKTV WATER SIGNAL — MKTV25-1TW to MKTV25-3TW Water Flow Indicators
- MAEDA KOKI MKCTV WATER SIGNAL — MKCTV20-1TW to MKCTV20-3TW Water Flow Indicators
- MAEDA KOKI MK WATER SIGNAL — MK15-1TW to MK30-4TW Water Flow Indicators
- MAEDA KOKI MKC WATER SIGNAL — MKC20-1TW to MKC45-8TW Water Flow Indicators
- MAEDA KOKI MKA WATER SIGNAL — MKA20-1TW to MKA45-8TW Water Flow Indicators
3. AIR SIGNAL — Gas Flow Monitoring
AIR SIGNAL products allow observation of gas flow and, in suitable series, approximate-flow confirmation or electrical switching. MKCM and MKAM provide flow-switch functions; MKT, MKCT and MKAT address approximate-flow observation. Basic MK, MKC and MKA units indicate flow through ball movement. Gas type, pressure and calibration conditions must be specified for the selected configuration.
Detailed Product Articles
- MAEDA KOKI MKT AIR SIGNAL — TA and TFA Gas Flow Indicators
- MAEDA KOKI MKCM AIR SIGNAL — MKCM TA-OFF and TA-ON Gas Flow Switches
- MAEDA KOKI MKAM AIR SIGNAL — MKAM TA-OFF and TA-ON Gas Flow Switches
- MAEDA KOKI MKTV AIR SIGNAL — MKTV TA Gas Flow Indicators and Specifications
- MAEDA KOKI MKCT AIR SIGNAL — MKCT TAR Gas Flow Indicators
- MAEDA KOKI MKAT AIR SIGNAL — MKAT TAR Gas Flow Indicators
- MAEDA KOKI MKCTV AIR SIGNAL — MKCTV TA Gas Flow Indicators and Specifications
- MAEDA KOKI MK AIR SIGNAL — MK TA Gas Flow Indicators and Specifications
- MAEDA KOKI MKC AIR SIGNAL — MKC TA Gas Flow Indicators and Specifications
- MAEDA KOKI MKA AIR SIGNAL — MKA TA Gas Flow Indicators and Specifications
4. FITV — Multi-Branch Flow Indicators
FITV combines fluid distribution, visual flow observation and adjustment valves in a multi-branch assembly. The listed configuration allows 2–14 branches, with the connection and required flow specified for each branch. It is useful where several lines need individual observation and adjustment. Specify the oil type or viscosity and branch arrangement when preparing an enquiry.
Detailed Product Articles
Three Monitoring Functions
Visual flow confirmation: movement of a ball or float provides a visible indication that fluid is flowing. This function should be distinguished from reading a numerical flow rate.
Approximate-flow observation: suitable models use the relationship between an internal ball or float and reference marks. The relevant flow curves and operating conditions are needed to interpret that position. The manufacturer describes these as a way to check approximate flow; they should not be presented as precision numerical meters.
Electrical flow switching: contact-equipped models signal a specified flow condition. Confirm the switching setpoint and ON/OFF designation, electrical load and fluid conditions. The switch setting and the maximum permissible flow are different selection values.
Selection at a Glance
| Requirement | Range to review | Selection focus |
|---|---|---|
| Oil flow observation | OIL SIGNAL visual and approximate-flow models | Oil type, viscosity, required flow and viewing arrangement |
| Water flow observation | WATER SIGNAL | Flow range, water conditions, connection and protective cover |
| Gas flow observation | AIR SIGNAL | Gas type, pressure and reference conditions |
| Electrical flow-condition signal | Suitable MKCM, MKAM or BSAM versions | Fluid-specific availability, setpoint, contact action and electrical rating |
| Flow observation with adjustment | Suitable MKTV, MKCTV or MKDV versions | Fluid, valve arrangement and operating range |
| Distribution to multiple branches | FITV | Number of branches, connection type and flow per branch |
Configuration and Operating Conditions
Confirm temperature and pressure ratings for the exact construction. Transparent acrylic-tube units and metal-tube flow switches have different limits and viewing capabilities. A protective cover or a similar base series code does not establish that two versions have identical materials or ratings.
For oil service, viscosity and temperature affect selection and switching behaviour. For gas service, state the operating pressure and the conditions under which flow is specified. Check installation direction, piping loads, vibration and contamination against the relevant instructions. Follow the electrical connection requirements for contact-equipped models.
Product Enquiries and Replacements
Provide the complete model designation, fluid, normal and minimum flow, maximum flow, operating temperature and pressure, connection size and required function. For a switch, include the desired switching flow and contact action. For FITV, specify the branch count, connections and flow requirement for each line.
When replacing an older unit, include nameplate photographs and the existing installation. Some products manufactured before 2015 may omit the W, L or A suffix used in later designations, and special specifications may not appear in the standard catalogue. Identify the fluid and configuration from the full equipment information.
Directory updated: 11 November 2026. This guide links to 16 oil, 11 water, 10 gas and 1 FITV product articles.