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HVAC Control Valve Equipment

Controlling flow and temperature in a central air-conditioning system plays a crucial role in overall operational efficiency. HVAC control valves are used as a solution to regulate water or air flow according to actual demand, thereby optimizing cooling performance and saving energy for the entire system.

What is an HVAC Control Valve?

An HVAC control valve is a device used to regulate the flow of water or air in air-conditioning systems, especially in Chiller, AHU, and FCU systems. The valve operates based on control signals from controllers (DDC/BMS), helping maintain stable temperature and pressure within the system.

Thanks to its precise control capability, HVAC control valves contribute to improving system efficiency and ensuring a stable operating environment.

Common Types of HVAC Control Valves

Depending on system configuration, HVAC control valves are generally classified by function and control mechanism as follows:

Flow function classification

There are two main types:

- 2-way valve:Regulates water flow according to actual cooling load, commonly used in FCU and AHU systems. This is the most common type of HVAC control valve in energy-optimized systems.

- 3-way valve:Allows mixing or diverting flow, helping maintain constant flow in the system. It is typically used in systems requiring stable water circulation.

Control mechanism classification

There are three types:

ON/OFF control valve:Fully opens or closes based on control signals, suitable for simple systems.

Modulating control valve:Adjusts flow proportionally (0–10V, 4–20mA), enabling precise temperature control and improved HVAC system efficiency.

Motorized valve:Uses a motor for operation and receives signals from BMS/DDC systems. It can function as either ON/OFF or modulating depending on configuration.

Installation Locations of Control Valves in HVAC Systems

To ensure efficient operation and precise regulation, HVAC control valves must be installed at appropriate positions in central air-conditioning systems:

At FCU and AHU (heat exchange coils):
The most common installation point, where the HVAC control valve regulates chilled water flow into the coil to control room temperature based on demand.

At Chiller system (supply and return loops):
Installed on supply or return pipelines to control water flow, ensuring stable chiller operation and preventing overload.

On main and branch pipelines:
Used to distribute and balance water flow across different zones, ensuring uniform and efficient system operation.

At bypass lines:
Some systems use HVAC control valves on bypass lines to maintain minimum flow, ensuring stable pump and chiller operation under low load conditions.

At independent control zones:
Installed in individual zones to control temperature separately, improving operational efficiency and energy savings.

Proper valve placement ensures HVAC control valves operate at maximum efficiency, maintaining a stable, flexible, and optimized air-conditioning system under all load conditions.

Benefits of Using Control Valves in HVAC Systems

Applying HVAC control valves in central air-conditioning systems provides several important benefits, especially in optimizing performance and energy savings:

- Optimized system performance: HVAC control valves precisely regulate chilled water or air flow based on actual load, ensuring optimal system operation without overloading or underloading.

- Energy efficiency: By adjusting flow dynamically, unnecessary operation of chillers, pumps, and fans is reduced, significantly lowering energy consumption.

- Stable temperature and indoor comfort: HVAC control valves help maintain consistent temperature across different zones, minimizing fluctuations and improving user comfort.

- Extended equipment lifespan:Proper flow control reduces stress on chillers, pumps, and related equipment, extending overall system durability.

- Enhanced automation capability:When integrated with BMS or DDC systems, HVAC control valves enable fully automated operation based on predefined control scenarios, reducing manual intervention.

Frequently Asked Questions about HVAC Control Valves

  1. How does an HVAC control valve work?
    It receives signals from a controller and adjusts water or air flow accordingly.

  2. Should I choose a 2-way or 3-way valve?
    It depends on system design; 2-way valves are ideal for energy savings, while 3-way valves are used for maintaining constant flow.

  3. Do control valves require maintenance?
    Yes, periodic inspection is required to ensure accurate and stable operation.

HVAC control valves are essential components for regulating flow, stabilizing temperature, and optimizing performance in central air-conditioning systems. Proper selection and installation help improve operational efficiency, save energy, and ensure long-term system reliability.

ĐỘNG CƠ ĐÓNG MỞ VAN FA3000 SERIES –JOHNSON CONTROLS

ĐỘNG CƠ ĐÓNG MỞ VAN FA3000 SERIES –JOHNSON CONTROLS

The FA-3300 series synchronous motor-driven, reversible, heavy duty actuators are available for 3-point (floating) or with electric positioner for 0… 10 V or 0… 20 mA control. They feature factory calibrated pressure switches to provide specified close-off ratings.
These actuators are available with 6000 N nominal force and can be used in combination
with VG8000 and VBD series valves in accordance with the maximum close-off pressure
ratings specified
Model Number : 
FA3341-7416

ĐỘNG CƠ ĐÓNG MỞ VAN FA2000 SERIES –JOHNSON CONTROLS

ĐỘNG CƠ ĐÓNG MỞ VAN FA2000 SERIES –JOHNSON CONTROLS

FA-2000 Spring Return Valve Actuator The FA-2000 series electric actuators are  available for 3-point control or with electronic positioner for 0…10 V or 0…20 mA control. It provides a fully variable valve aperture, a power failure spring return safety mechanism and an electrically operated manual override.
Models for 3-point and proportional 0…10 V or 0…20 mA control
The FA-22 and FA-25 electric spring return actuator models are to be used with the VBB, VBD and VG8000 valve series
Model Number : 
FA2241, FA2341, FA2441, FA25xx, FA26xx, FA27xx

ĐỘNG CƠ ĐÓNG MỞ VAN VPA SERIES – JOHNSON CONTROLS

ĐỘNG CƠ ĐÓNG MỞ VAN VPA SERIES – JOHNSON CONTROLS

Electric Actuator VAP Series 600N, 1000N, 3000N 
The VAP series BLDC motor-driven actuators are available for proportional control or 3-point (floating) control. They feature stroke calibration and manual operating which are user friendly to job sites. In combination with VGA7000, VGA8000 or VPMA series valves, they provide specified close-off pressure according to the application requests
Proportional control, floating control mode selectable, Multiple input and feedback signal selectable
Model Number : 
VAP600 , VAP1000 , VAP3000

VAN AHU VGA 8000 SERIES – JOHNSON CONTROLS

VAN AHU VGA 8000 SERIES – JOHNSON CONTROLS

VGA8000 Series Flanged Globe Valve PN16
1: DN15 to DN250 available
2: Kvs 0.63 to 700 m3 /h
3: High-grade ductile iron QT450-10 for valve body
4: Standard flange connection of ISO7005-2
5: Fitted with VAP-B, VAF series actuator with various △P available for different applications
Model Number: 
VGA8201xx, VGA8803xx , VGA8903xx

VAN AHU /FCU VGA 7000 SERIES  – JOHNSON CONTROLS

VAN AHU /FCU VGA 7000 SERIES – JOHNSON CONTROLS

VGA7000 Series Threaded Globe Valve
1: DN15 to DN50 available
2: Kvs 0.63 to 40m3 /h
3: High-grade Stainless Steel for Valve body and stem
4: Standard flange connection of ISO7-1
5: Fitted with VAP-B, VAF series actuator with various △P available for different applications
Model Number : 
VGA7201, VGA7803

VAN AHU / FCU VG 8000 SERIES –JOHNSON CONTROLS

VAN AHU / FCU VG 8000 SERIES –JOHNSON CONTROLS

VG8000N DN15...150, PN16 Flanged Control Valves
These electrically and pneumatically operated flanged valves are primarily designed to regulate the flow of water and steam in response to the demand of a controller, in heating, ventilating and air conditioning systems. 
2-way PDTC (normally open),  
3-way mixing and 3-way diverting configurations
 Fluid temperature 0...180 °C , with Glycerine cup -10...180 °C
Model Number : 
VG82AxxxN, VG88AxxxN, VG89xxxxN, VG7000-1007

VAN FCU / AHU VG 7000 SERIES  –JOHNSON CONTROLS

VAN FCU / AHU VG 7000 SERIES –JOHNSON CONTROLS

The VG7000 Series electrically and pneumatically operated bronze valves with female threaded
connection are designed primarily to regulate the flow of water and steam in response to the demand of a controller, in heating, ventilating, and air conditioning systems. These valves are available in normally open (N.O.) “push down to close”, (N.C.) “push down to open”, and three way mixing configurations. Both electric and pneumatic actuators are available
DN15, DN20, DN25, DN32, DN40, DN50
Model Number : 
VG7000-1013, VG7000-1014, VG7000-1001, VG7000-1007

VAN FCU VG 6000 SERIES  –JOHNSON CONTROLS

VAN FCU VG 6000 SERIES –JOHNSON CONTROLS

The VG6000 forged brass valve series is primarily designed to regulate the flow of water in response to the demand of a controller in zone and terminal unit applications and can be used in combination with VA-703x Thermal ON/OFF Actuators and VA-747x Electronic Terminal Unit Valve Actuators. The valves are available in 2-way PDTC (Normally 
Open), 3-way mixing and 3-way mixing with built-in bypass configurations..
Body size DN15, DN20, DN25
Model Number : 
VG6210, VG6810, VG6510

VAN FCU VG 5000 SERIES –JOHNSON CONTROLS

VAN FCU VG 5000 SERIES –JOHNSON CONTROLS

The VG5000 forged brass valve series is primarily designed to regulate the flow of water in response to the demand of a controller, in zone and terminal unit applications. They can be used in combination with VA-7010 electric ON/OFF actuator, VA-7040 thermal actuator and or VA-7450 floating or proportional actuator.
The valves are available in 2-way PDTC (Normally Open), 2-way PDTO (Normally Closed), 3-way mixing and 3-way mixing with built-in Normally Open bypass configurations..
Model Number : 
VG52xx , VG54xx, VG55xx, VG58xx 

VAN FCU / AHU KẾT NỐI BÍCH VG 112F5 SERIES   – JOHNSON CONTROLS

VAN FCU / AHU KẾT NỐI BÍCH VG 112F5 SERIES – JOHNSON CONTROLS

VG12F5xx-C Series DN65...150, PN16
The VG12F5 series ball valves are designed for water control in HVAC systems. The valve can be used together with Johnson Controls rotary actuator to accurately regulate the flow in response to the requirements of the controller.
These ball valves can be directly mounted with Johnson Controls VA9300 series actuators for fast field installation and easy valve insulation..
Model Number : 
VG12F5

VAN FCU / AHU KẾT NỐI BÍCH VG 1000 SERIES –JOHNSON CONTROLS

VAN FCU / AHU KẾT NỐI BÍCH VG 1000 SERIES –JOHNSON CONTROLS

The VG1000 Series Flanged Ball Valves are primarily designed to regulate the flow of hot water, chilled water, and 50/50 glycol solutions to the demand of a controller in HVAC systems. The valves come in sizes of 2-1/2 in., 3 in., 4 in., 5 in., and 6 in (DN65 TO DN100). These American Society of Mechanical Engineers (ASME) Class 150 flanged valves come in both two- and three-way configurations. Johnson Controls offers valve, linkage, and actuator assemblies for factory
or field mounting with either spring return or non- spring return actuators.
Model Number : 
VG12A5, VG12E5, VG18A5

VAN AHU / FCU VG 1000 SERIES –JOHNSON CONTROLS

VAN AHU / FCU VG 1000 SERIES –JOHNSON CONTROLS

VG1000-C Series Ball Valves are designed to regulate the flow of hot or chilled water and low-pressure steam in response to the demand of a controller in Heating, Ventilation and Air Conditioning (HVAC) systems. Now, available models of VG1000-C are in size DN25 to 
DN50, this family of forged brass valves can be field mounted to Johnson Controls VA9104, M9106, M9108 and M9109 Series Non-spring return and VA9203, VA9208 Series spring return electric actuators for on/off floating or proportional control.
Model Number : 
VG1205CL, VG1205CN, VG1291, VG1891, GV1841, VG1845, VG1805 .

VAN FCU VLC 2000 SERIES - JOHNSON CONTROLS

VAN FCU VLC 2000 SERIES - JOHNSON CONTROLS

The VLC2000 Series is designed to control water flow according to signal received from the controller. This maintains the room temperature by adjusting water flow through the fan coil unit. 
The VLC2000 Series features a spring return function, and are available in DN15/20/25 valve sizes. The valve and actuator can be easily assembled on the field without accessories and commissioning. 
Model Number : 
VLC2200FC-C, VLC2200GC-C, VLC2200HC-C, VLC2300FC-C, VLC2300GC-C

VAN FCU VG 4000 SERIES  –JOHNSON CONTROLS

VAN FCU VG 4000 SERIES –JOHNSON CONTROLS

VG4000 Series High-Capacity/High-Closeoff Electric Zone Valves are designed to regulate the flow of water in response to the demand of a controller in zone and Variable Air Volume (VAV) reheats coil applications. The high-capacity/high-closeoff capability of the VG4400xx-C and VG4800xx-C also makes this family of valves an ideal choice for fan coil and baseboard 
radiation applications. Normally Closed (N.C.) VG4000 series valve is designed for use with VA-7010 Series on/off control actuators and VA-7450 Series floating or proportional control  Actuators . DN 15 TO DN20

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