FCU Series Motorized Valve

The FCU Series Motorized Valve is applicable to the terminal of central air conditioning systems. The motorized valve is normally closed when powered off and controls the opening and closing of the medium in the terminal fan coil unit according to instructions from the thermostat.

When the indoor temperature does not reach the set value, the thermostat gives an open instruction. The motorized valve opens, allowing the medium to enter the fan coil unit. When the indoor temperature reaches the set value, the thermostat gives a close instruction, and the motorized valve closes under the drive of the reset spring.

By coordinating the thermostat and motorized valve, the system helps maintain indoor temperature within a comfortable range while reducing unnecessary energy consumption.

As a key component of HVAC automation, the motorized valve provides automatic terminal flow control without requiring continuous manual operation. In building automation systems, motorized valves can respond to control signals from thermostats and other control equipment to coordinate heating and cooling operation. This supports more consistent temperature control and more efficient HVAC operation.

HaiLin develops and manufactures HVAC automation products including thermostats, automatic valves, sensors, DDC controllers, edge computing gateways, and management platforms, providing integrated products for HVAC automation systems.

Features

Forged Brass Valve Body

The valve body is made of forged brass, providing a robust structure for terminal HVAC applications.

Stainless Steel Valve Seat and Aluminum Housing

The valve uses a stainless steel valve seat and aluminum actuator housing for reliable operation and structural durability.

Fully Enclosed Synchronous Motor Drive

A fully enclosed unidirectional hysteresis synchronous motor drive is adopted. The actuator is equipped with a stainless steel return spring for spring-return operation.

Normally Closed 2-Way and 3-Way Valves

Both normally closed 2-way valves and 3-way diverter valves are available to accommodate different fan coil unit and HVAC piping configurations.

Manual Operation

Manual operation is available for convenient adjustment and servicing when required.

Convenient Disassembly

The actuator and valve body can be conveniently disassembled, helping simplify installation, inspection, and maintenance.

How the FCU Motorized Valve Works

The FCU Series Motorized Valve works together with a thermostat to automatically regulate the medium supplied to a fan coil unit.

Temperature Detection
The thermostat monitors the indoor temperature and compares it with the preset temperature.

Open Command
When the indoor temperature has not reached the set value, the thermostat sends an open instruction to the motorized valve.

Valve Opening
The actuator drives the valve open, allowing the heating or cooling medium to enter the fan coil unit.

Temperature Regulation
The fan coil unit exchanges heat with the indoor air to help bring the room temperature toward the set value.

Close Command
When the indoor temperature reaches the set value, the thermostat sends a close instruction.

Spring Return
The motorized valve closes under the action of the reset spring, stopping the medium flow through the terminal unit.

This thermostat-controlled operation enables automatic flow control and helps reduce unnecessary heating or cooling operation.

Motorized Valve for Fan Coil Unit HVAC Systems

A motorized valve combines a valve body with an actuator to automatically control fluid flow in a piping system. In HVAC applications, it can be used to control the flow of heating or cooling water supplied to terminal equipment.

For FCU systems, the valve works as an important link between the thermostat and fan coil unit. The thermostat determines when heating or cooling demand is present, while the motorized valve responds by opening or closing the water circuit.

The FCU Series Motorized Valve is therefore suitable for terminal-level HVAC automation where reliable on/off flow control, automatic temperature regulation, and energy-conscious operation are required.

2-Way and 3-Way Motorized Valve Options

Normally Closed 2-Way Motorized Valve

The normally closed 2-way valve controls the flow of the heating or cooling medium through the fan coil unit. When the valve receives an open command, the valve opens and allows the medium to enter the terminal unit. When the control signal is removed, the return spring drives the valve back to the closed position.

This configuration is suitable for common fan coil unit applications requiring straightforward on/off flow control.

3-Way Diverter Valve

The 3-way diverter valve provides an alternative flow-control configuration for HVAC terminal systems. It can be selected according to the piping arrangement and control requirements of the fan coil unit.

The availability of both 2-way and 3-way configurations allows the FCU Series Motorized Valve to accommodate different terminal HVAC system designs.

Energy-Saving Temperature Control

The cooperation between a thermostat and motorized valve enables the FCU terminal to respond to actual indoor temperature demand.

When heating or cooling is required, the valve opens to allow the medium to enter the fan coil unit. Once the indoor temperature reaches the set value, the valve closes to stop unnecessary medium flow.

This automatic control helps:

• Reduce unnecessary heating and cooling
• Maintain a more stable indoor temperature
• Improve terminal HVAC control
• Reduce energy waste caused by continuous medium flow
• Support more efficient building operation

Integrated HVAC control is also an important part of HaiLin's broader building automation approach. HaiLin provides solutions covering HVAC control, energy management, smart lighting, and other intelligent building functions across applications such as commercial buildings, healthcare, laboratories, hotels, and data centers.

Reliable Construction for HVAC Applications

The FCU Series Motorized Valve uses selected materials for the main valve and actuator components:

• Valve body: Forged leaded brass
• Actuator housing: Aluminum alloy
• Valve seat: Stainless steel
• Spring: Stainless steel
• Stem: Brass with nickel-plated surface
• Sealing: NBR
• Bracket: Plastic

The combination of these materials is designed for stable operation in terminal HVAC applications within the specified operating conditions.