PRO UNI-D CO., LTD

Home
PRO UNI-D CO., LTD

PRO UNI-D CO., LTD is a manufacturer of electric actuators, solenoid valves, and valves.

Our brand are Uni-D, miT-UniD-cns, and Di-HEn, all products are made in Taiwan. PRO UNI-D CO., LTD was established in 1988, we are the professional manufacturer of electric actuator, solenoid valve, and butterfly valve. We created our own brand, one is Uni-D and the other one is miT-UniD-cns. Our products are used in automation control for engineering, industrial equipment, and any kinds of automation control system.

13/05/2026

Stop Corrosion Before It Starts: The UNI-D Butterfly Valve Advantage

In harsh industrial environments like mining and chemical processing, every detail matters. At UNI-D, we don't just make valves; we engineer durability.

What makes our butterfly valves stand out?

1. Anti-Corrosion Design:
Our streamlined handle prevents water accumulation, eliminating
rust risks from the source.

2. Mining-Grade Protection:
High-performance epoxy coating ensures superior abrasion
resistance in the toughest conditions.

3. Universal Compatibility:
One interface, four standards. Fully compatible with PN10/16,
ANSI150LB, and JIS 10K.

4. Effortless Operation:
Low-torque engineering ensures smooth manual control with
minimal force.

13/04/2026

Dry Contact vs. Electric Limit Switch — What’s the Difference?
Electric limit switches control MOTION;
Dry contacts communicate STATUS.

Dry Contact: The "Messenger"
A dry contact is not a sensor. It is a voltage-free output (typically a relay contact) that simply opens or closes to report a status.
--No internal voltage supplied: It’s a "clean" switch.
--Signal only:
Used to report position (Open/Closed) to PLCs or DCS.
--Interface role:
It acts as a bridge between the actuator and your control room.
--Function: Valve feedback signal (e.g., "I am closed!").

Electric Limit Switch: The "Controller"
This is the internal brain or mechanism that manages the actuator's physical travel.
--Motion Control: It determines the exact end positions (0° to 90°).
--Motor Protection:
It cuts power to the motor at preset limits to prevent over-travel.
--Technology:
Can be traditional mechanical cams or modern electronic sensors.
--Function: Ensuring the actuator stops precisely at the right angle.

05/03/2026

By Wayne Chiu

Electric Actuator Assemble with Stainless Steel Butterfly Valve

Basic type electric actuator butterfly valve provides smooth and stable configuration for different kinds of water treatment. To protect the electrical equipment and gearbox with proofness, the electric actuator with Nylon housing is standard as IP67. Optional function, such as, extra limit switches (dry contact for signal feedback), heater (anti-condensation), failsafe, is available upon your request. Body/disc of butterfly valve with stainless steel and sealing parts with EPDM are suitable and compliance for fluid like water.

Our factory is certified by ISO9001, CE and CSA. These electric actuator butterfly valves are 100% tested and under control by our Quality Department before shipment.

27/01/2026

By Wayne Chiu

Techinically, with different acting structure, material of valve body, and material of sealing parts, solenoid valves can apply to a variety of fluid. However, coil is the component where energy and operation exactly conduct during usage. There are at least four different kinds of type to let the valve adopt to any of the surroundings. To clarify their function and characteristics, we are about the point that out in the following content.

1. Iron Case Coil (2-wire)
It is the universal type of coil to match most of the models of our solenoid valve. It can meet the requirements of most of the conditions. However, if you need something about water proofness, you might find the following options for your specific solution.

2. Waterproof Coil (2-wire / DIN PLUG)
Waterproof coil comes with two types. One is with 2-wire and the other is with DIN PLUG. It offers different kinds of wiring to meet our clients’ demands. However, for outdoor use, please make sure you make a protective cover to keep from direct sunlight and long-last rainfall.

3. NASS DIN Coil (IP65)
Waterproof coil (NASS DIN) made in Germany supplies the advanced water proofness prior to the one we introduced previously, and it is certified as IP65.

4. NASS Explosionproof Coil (IP67)
If you need to use solenoid valve in an explosive atmosphere and hazardous surroundings, explosionproof coil supplied by nass magnet is definitely a wise choice.
Activate to view larger image,
No alternative text description for this image

19/01/2026

Beyond Valves: What else can you automate with Electric Actuators?

In the world of industrial automation, most professionals immediately think of valves when they hear "Electric Actuator." While valve control is a cornerstone of the industry, the "versatility" of these devices goes much further!

Beyond standard fluid control, electric actuators serve as the silent workhorses behind a wide array of critical industrial equipment. Here are some key non-valve applications:

Here’s how we use them to drive efficiency beyond fluid control:
-- HVAC & Ventilation: Precision control for Dampers and Louvers.
-- Water Management: Reliable operation of Sluice Gates and Penstocks.
-- Logistics: Sorting and routing via Conveyor Deflectors.
-- Bulk Handling: Dosing materials through Hopper and Chute Gates.
-- Renewables: Enhancing Solar Tracking systems.

The Edge: Electric systems provide better positioning accuracy, lower maintenance, and seamless digital feedback compared to traditional pneumatics.

-- Question: There is an electric actuator connecting to a valve, do you know which photo?

16/12/2025

Modulating Control: Electric Actuator & Butterfly Valve (4-20mA Live Test)

https://www.instagram.com/reel/DSROa3BgMQC/?utm_source=ig_web_copy_link&igsh=NTc4MTIwNjQ2YQ==

12/12/2025

Important~~Intermittent Duty Solenoid

In many industrial and automation applications, solenoids don't operate continuously. Instead, they activate briefly and rest for longer periods. For these scenarios, Intermittent Duty Solenoids are the ideal solution—offering strong, rapid actuation with a specific thermal limitation that engineers must respect.

Key Characteristics of Intermittent Duty Solenoids

1. High Peak Force (Instantaneous Magnetic Force)
Intermittent-duty coils are built to handle higher current density for short periods. This allows them to generate faster and more powerful actuation than continuous-duty designs.

2. Strict Thermal Constraints
Thermal limits are the most important factor in using an intermittent-duty solenoid. The coil insulation can only withstand high temperatures briefly. If the energization time exceeds the specified ED (Energized Duty) rating, heat rises quickly and may cause:

💣 Coil Burnout – Insulation melts or carbonizes, leading to short circuits.
💣 Reduced Reliability – Even without immediate failure, repeated overheating significantly shortens service life.

📢 Why This Matters
Selecting the wrong duty type—or exceeding the ED rating—can cause premature failures, unplanned downtime, and higher maintenance costs. Understanding how intermittent-duty designs work helps ensure safe and reliable operation.

25/11/2025

The video shows how does a fl**ge solenoid valve work

30/10/2025

How Does a Solenoid Valve Work?

In many industrial systems — from water treatment to HVAC and automation — solenoid valves play a key role in controlling fluid flow with precision and reliability.

A solenoid valve converts electrical energy into mechanical motion.
When an electric current passes through the coil, it generates a magnetic field that pulls a small metal plunger upward. This simple action opens the valve, allowing liquid or gas to flow.

When the current stops, the magnetic field disappears, and a spring pushes the plunger back, closing the valve and stopping the flow.

In short:
💡 Electricity → 🔁 Magnetic Force → ⚙️ Valve Operation → 🌊 Flow Control
Compact, fast, and highly reliable, solenoid valves are widely used wherever automation and precise control are needed.

21/08/2025

How a 5-Way Motorized Valve Works in a Sand Filter System?

In water treatment, sand filter systems play a key role in producing clean and safe water by removing suspended solids and impurities. A critical component that makes these systems efficient is the 5-way motorized valve.

Unlike traditional manual valves, the 5-way motorized valve automates water flow control inside the system. With just one valve, it can switch between multiple operations:

--Filtration – Raw water flows through the sand bed, producing clean water.
--Backwash – Flow reverses to flush out trapped particles from the filter media.
--Rinse – Cleans residual dirt after backwash before returning to filtration.
--Drain/Bypass – Isolates tanks for maintenance or directs water to drain.
--Circulation – Balances system flow when filtration isn’t required.

By automating these processes, the 5-way motorized valve ensures:
Greater efficiency (automatic cycle changes)
Better reliability (consistent water quality)

Simplified operation & piping (replacing multiple manual valves)
As shown in the diagram below, these valves are installed at each filter tank, making the system smarter and easier to maintain.

The 5-way motorized valve is the heart of automation in a sand filter system.

15/08/2025

How can control valves be used in the HVAC industry?

1. Regulating Flow in Chilled Water & Hot Water Systems
In central HVAC systems, chilled water (for cooling) or hot water (for heating) circulates through coils in air handling units (AHUs), fan coil units (FCUs), or other terminal devices.
A control valve adjusts the amount of water flowing into these coils, thus controlling the heat exchange and regulating room temperature precisely. This can be done via two-way (modulates flow) or three-way (bypasses flow) valves.

2. Controlling Steam for Heating
In some industrial HVAC systems (especially older ones or large facilities), steam is used for heating coils or humidification.
A control valve regulates steam pressure and flow to prevent overheating and maintain desired temperatures.

3. Special Industrial HVAC Applications
--Cleanrooms: Control valves help maintain strict temperature and humidity ranges.
--Data centers: Precise chilled water control prevents overheating of server racks.
--Manufacturing processes: Where HVAC doubles as process cooling/heating, valves control temperature-critical production environments.

Address

NO 7, RAY YUAN STREET

33447

Opening Hours

Monday	08:00 - 17:00
Tuesday	08:00 - 17:00
Wednesday	08:00 - 17:00
Thursday	08:00 - 17:00
Friday	08:00 - 17:00

Website

https://en.unid.com.tw/

Alerts

Be the first to know and let us send you an email when PRO UNI-D CO., LTD posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to PRO UNI-D CO., LTD:

Shortcuts

Want your business to be the top-listed Business?

Country:

City: