What TGK does

TGK CO., LTD. (株式会社テージーケー) is a privately held Japanese manufacturer founded in 1959 (originally as Toho Gas Kogyo Co., Ltd., renamed TGK in 1984) and headquartered in Hachioji-shi, Tokyo. The company specializes in precision control components, most notably as one of only four global manufacturers of expansion valves for automotive air conditioning systems. Its product portfolio spans thermostatic and electronic expansion valves, compressor control valves (mechanical and electromagnetic versions), motor actuators, solenoid and motor switching valves for heat pump systems, pressure switches, fuel control devices, and various sensors (humidity, temperature, sunlight), alongside a housing equipment line including hot water switching valves, flow sensors, combined valves, and water dispenser solenoids.

The company generates revenue through direct B2B hardware sales to global automotive OEMs and Tier 1 thermal system suppliers, with additional revenue from Japanese housing equipment manufacturers. TGK operates a globally distributed manufacturing footprint across Japan, Italy, China, Korea, and Mexico through six wholly-owned overseas subsidiaries, serving customers including Toyota, Honda, BMW, Mercedes-Benz, Volkswagen, DENSO, Valeo, Hanon Systems, MAHLE on the automotive side, and DAIKIN, Rinnai, Toto, LIXIL, and Mitsubishi Electric on the housing equipment side. Its core technology base covers fluid control, measurement engineering, electronics, materials engineering, acoustics, and vibration, with over 1,000 patent applications filed and in-house development of both product design and production equipment establishing its technical positioning.

TGK maintains independence from any automaker group, which enables it to supply across competing OEMs, and has grown entirely through internal capital without external funding rounds. With disclosed turnover of ¥156 billion as of October 2025, the company employs a vertically integrated model spanning R&D (Technical Center, Germany Technical Center), precision parts machining (Tana Plant), and full assembly (Shiroyama Plant, Kunugida Plant, Nirasaki Plant, plus overseas facilities). Current strategic priorities include EV/HEV heat pump control valves, next-generation low-environmental-impact refrigerants, and shape memory alloy haptic actuators, reflecting adaptation to automotive electrification and emerging human-machine interface requirements.

Name

TGK

Legal name

株式会社テージーケー

Website

https://tgk-jp.com

Company type

Private

Founded year

1959

Operating status

Operating

Headcount range

501–1,000 employees

Short description

TGK is an independent Japanese manufacturer of precision control components for automotive air conditioning and residential housing equipment, one of only four global makers of car A/C expansion valves, serving OEMs including Toyota, BMW, and Denso with manufacturing in five countries.

Ownership category

akta.pro rank

Product category

Automotive Climate Control Components

NAICS

Motor Vehicle Electrical and Electronic Equipment Manufacturing (336320), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Industrial Instruments For Measurement, Display, And Control (3823), Electronic Components & Accessories (3670)

akta.pro primary industry

Automotive Coolant & Refrigerant Circuit Components (Pumps/Valves/Reservoirs/Expansion Devices) (IMACALAE)

akta.pro secondary industries

Automotive HVAC Controls & Actuation (HVAC ECUs/Actuators/Sensors) (IMACALAH), Automotive Air Distribution & Ventilation Components (Blower Motors/Ducts/Vents/Cabin Filters) (IMACALAF), Refrigeration Components & Controls (Compressors, Valves, Sensors) (IMAHAKAH)

Keywords

• Automotive climate control components
• Precision control valves
• Refrigerant expansion valves
• Housing equipment valves
• Haptic feedback actuators

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Operations, Infrastructure, Marketing or Sales

Revenue model

1. Automotive Control Components: TGK manufactures and sells automotive air conditioning control components including expansion valves, compressor control valves, motor actuators, switches, sensors, and solenoid valves to automotive manufacturers and Tier 1 suppliers globally.
2. Housing Equipment Control Components: Products for residential water heaters, hot water systems, toilets, and air conditioning including hot water switching valves, flow sensors, combined valves, and solenoid valves for water dispensers.
3. Haptic Devices: Shape memory alloy impact actuators for automotive and consumer electronics applications providing tactile feedback for touch panels and switches.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels4 records

Core offering

TGK manufactures and sells precision control components for automotive air conditioning (thermostatic and electronic expansion valves, compressor control valves, motor actuators, solenoid switching valves, pressure switches, sensors), residential housing equipment (hot water switching valves, flow sensors, combined valves, water dispenser solenoid valves, plumbing control devices), and shape memory alloy haptic actuators for touch panels. Customers are global automotive OEMs, Tier 1 suppliers, and housing equipment manufacturers, with all products and production equipment developed in-house.

Product overview

TGK is a manufacturer of precision control components for automotive and residential applications. The product portfolio consists of three main categories: (1) Control Devices for Automobiles including thermostatic expansion valves, compressor control valves (MCV/ECV), motor actuators, electronic expansion valves, solenoid switching valves, motor switching valves, combination valves, pressure switches, fuel control devices, humidity sensors, temperature/humidity sensors, sunlight sensors, hot-water control valves, and vacuum actuators; (2) Control Devices for Home Appliances including hot water switching valves, hot water valves, flow sensors, combined valves, water solenoid valves for dispensers, and plumbing control devices for toilets; and (3) Haptic Devices featuring shape memory alloy impact actuators for tactile feedback in touch panels and switches. TGK develops and manufactures both products and production equipment in-house, enabling technological superiority and rapid product development.

Differentiator

Problem solved

Functional benefit

Products and services

• Thermostatic Expansion Valves (温度式膨張弁) Devices that ensure efficient cooling by adjusting refrigerant flow volume based on cabin temperature and other factors; used by automotive OEMs in car air conditioning systems.
• Compressor Control Valves (MCV/ECV) (コンプレッサ容量制御弁) Devices that control compressor discharge capacity, suppress temperature fluctuations, and reduce compressor load; available in mechanical (MCV) and electromagnetic (ECV) versions for variable displacement compressors.
• Motor Actuators (モーターアクチュエータ) Devices that control air flow switching between vents and internal/external air circulation, and drive dampers that adjust air temperature.
• Electronic Expansion Valves (電子膨張弁) Expansion valves with stepping motors providing highly accurate flow rate characteristics, adjustable to any valve opening position via external control.
• Solenoid Switching Valves (冷媒切替電磁弁) Valves mounted on heat pump car A/C systems for switching refrigerant flow depending on cooling/heating mode.
• Motor Switching Valves (冷媒切替モータ弁) Devices installed in heat pump car air conditioners that switch refrigerant flow paths; available in 2-way, 3-way, and 4-way configurations.
• Combination Valves (コンビネーション弁) Integrated control valves combining thermostatic expansion valves with 2-way solenoid valves for refrigerant control.
• Pressure Switches (圧力スイッチ) Switches that activate or deactivate compressors or condenser fans based on refrigerant pressure.
• Fuel Control Devices (燃料系制御機器) Solenoid valves that control fuel supply to diesel engines.
• Anti-fog Humidity Sensors (窓曇り検知用湿度センサ) Sensors that detect fog on window glass and relay data to air conditioner controls.
• Temperature and Humidity Sensors (温度・湿度センサ) Sensors that detect cabin temperature and humidity and relay data to air conditioner controls.
• Sunlight Sensors (日射センサ) Sensors that detect sunlight intensity hitting the vehicle and relay data to air conditioner controls.
• Hot-water Control Valves (温水制御弁) Devices that control hot-water flow to heat exchangers and adjust discharged air temperature.
• Vacuum Actuators (バキュームアクチュエータ) Devices powered by engine negative pressure that control accelerator stroke.
• Hot Water Switching Valves (温水切替弁) Valves that switch hot water flow to reserve tanks or enable circulation for freeze prevention in residential water heating systems.
• Hot Water Valves (注湯弁) Valves that automatically stop hot water flow when a bathtub fills to the set volume.
• Flow Sensors (流量センサ) Sensors that measure hot water usage volume and monitor remaining water in tanks.
• Combined Valves (集合弁) Valves combining flow sensors and motor control valves for monitoring flow volume and controlling cold/hot water mixture for comfortable temperature.
• Water Solenoid Valves for Water Dispensers (ウォーターサーバー用電磁弁) Valves that open and close water dispenser faucets, produced with hygiene-conscious manufacturing processes.
• Plumbing Control Devices for Tankless Toilets (洗淨便座・タンクレストイレ用水回り制御機器) Integrated control devices for tankless toilets contributing to water savings and space efficiency.
• Shape Memory Alloy Impact Actuator (形状記憶合金衝撃型アクチュエータ) Haptic device that provides click feeling and tactile sensation for capacitive or pressure-sensitive touch panels and switches in automotive and consumer electronics applications.
• Temperature-type Automatic Expansion Valves (カーエアコン用冷媒制御弁) Devices that control refrigerant flow to regulate cold air temperature for stable and efficient car air conditioning operation.

Quantifiable outcome

• One of only 4 manufacturers globally of expansion valves for car air conditioning
• +2 more outcomes

Named customers19 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

One partnership is on record.

• Nitto Co., Ltd. (joint venture with Nippon Radiator Co., Ltd., currently Calsonic Kansei Corporation)minorStrategic or Co-development Partner · 1 January 1973Joint venture established in Fukushima Prefecture in 1973 with Nippon Radiator Co., Ltd. (now Calsonic Kansei Corporation) for manufacturing fuel caps and other automotive components

Scale indicators3 records

Recent moves16 records

Expansion highlights5 records

Direct peers

• Modine Manufacturing: US-based thermal management specialist serving automotive (especially EV battery and power electronics cooling), commercial HVAC, and data center cooling. Comparable to TGK on automotive thermal management components, though at broader system level rather than discrete valves.
• Egelhof Group: German specialist manufacturer of thermostatic expansion valves and control components for automotive air conditioning. Direct peer to TGK in the niche of precision expansion valves for vehicle HVAC systems, primarily serving European OEMs.
• Sanhua Holding Group: China-based global leader in HVAC/refrigeration components (expansion valves, solenoid valves, electronic controllers) that has aggressively expanded into automotive thermal management. Directly comparable to TGK on automotive expansion valves and electronic control valves, with broader HVAC/refrigeration scope.
• Fujikoki Corporation: Japanese manufacturer of automotive expansion valves and HVAC/refrigeration control components. Like TGK, Fujikoki is one of the few independent suppliers of precision thermostatic and electronic expansion valves globally, supplying OEMs and Tier 1s across automotive and residential refrigeration.
• Saginomiya Seisakusho: Japanese manufacturer of pressure controls, expansion valves, and precision fluid control components for automotive and HVAC applications. Comparable to TGK as a Japan-based specialist in automotive refrigerant circuit and pressure switch components serving major OEMs.

Broad incumbents

• Marelli Holdings: Global automotive supplier (formed from Magneti Marelli and Calsonic Kansei) with significant thermal/HVAC systems exposure. Comparable to TGK as a broad incumbent in vehicle thermal management, though at the integrated system level rather than as a precision valve specialist.
• Hanon Systems: Global automotive thermal management systems supplier (HVAC modules, compressors, EV thermal management). Both a TGK customer for components and a broader incumbent competitor in integrated thermal management solutions.
• MAHLE Group: Global automotive supplier with significant thermal management portfolio (radiators, HVAC, EV battery cooling). Both a TGK customer and a broader incumbent in automotive thermal management systems.
• Sanden Holdings: Japanese automotive HVAC compressor and systems manufacturer that is both a TGK customer (buys valves/components) and a broader competitor in vehicle climate control systems. Comparable at the integrated HVAC system level rather than discrete valve level.

Emerging players

• Ningbo Tuopu Group: China-based automotive supplier expanding into thermal management components (radiators, condensers, cooling modules) for EVs. Overlaps with TGK on automotive thermal system components but is more vertically integrated into modules and serves primarily China-based EV OEMs.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/tgk-co-ltd-

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries8 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about TGK