2-Way 1" Motorised Zone Valve

The Resideo V4043H1122/U motorized zone valve is a 2-way valve with 1" female threaded connection, designed to automatically control water flow in hydronic heating and cooling systems. It features a Kvs of 8.6, a 230 V electric actuator, on/off operation, spring return and an SPDT auxiliary contact, providing a compact solution for independent control of circuits or zones.

This valve operates in a normally closed configuration: when it is not powered, the spring keeps the water passage closed. When voltage is applied, the actuator opens the valve and allows flow through the circuit. It is especially suitable for domestic installations and small commercial applications where hot or cold water supply must be automated to a specific zone.

Main features of the Resideo V4043H1122/U

• Brand: Resideo.
• Series: V4043H.
• Reference: V4043H1122/U.
• Type: 2-way motorized zone valve.
• Operation: on/off.
• De-energized position: normally closed.
• Connection: 1" BSPP female thread.
• Nominal diameter: DN25.
• Kvs: 8.6.
• Power supply: 230 V AC.
• Frequency: 50 Hz.
• Electrical consumption: 9.6 VA.
• Current: approximately 0.04 A.
• Return: spring return to closed position.
• Auxiliary contact: SPDT.
• Maximum operating pressure: 8.6 bar.
• Maximum closing differential pressure: 0.45 bar.
• Fluid temperature: 5 to 88 °C.
• Nominal opening time: approximately 15 seconds.
• Body: brass.
• Stem: stainless steel.
• Shut-off element: NBR.
• Seals: EPDM.
• Manual override: yes.
• Cable length: 1 m.

Automatic zone flow control

The Resideo V4043H1122/U allows a hydraulic circuit to be opened or closed automatically according to heating or cooling demand. It can be integrated into zoned installations to independently control water flow to radiators, fan coils, heating circuits or other compatible emitters.

When a thermostat or controller requests operation, the actuator is powered and opens the valve. When the electrical signal disappears, the spring return mechanism automatically closes the flow, isolating the circuit.

Normally closed valve with spring return

The rest position of this valve is closed. This means that, in the absence of electrical power, water does not circulate through the valve body. When voltage is applied to the actuator, the motor overcomes the spring force and moves the mechanism to the open position.

When power is removed, the spring automatically returns the valve to its initial position. This operation is especially practical in zoned systems, since each circuit remains closed whenever there is no demand.

1" connection and Kvs 8.6

The V4043H1122/U reference corresponds to the version with 1" BSPP female threaded connection and DN25 nominal diameter. Its hydraulic capacity is defined by a Kvs of 8.6, according to Resideo commercial documentation for the European market.

This value should be taken into account when sizing the installation, together with the required flow rate and available pressure drop, ensuring that the valve operates within the conditions specified by the manufacturer.

Maximum operating pressure of 8.6 bar

The valve supports a maximum static operating pressure of 8.6 bar. For this DN25 1" version, Resideo specifies a maximum closing differential pressure of 0.45 bar.

Differential pressure is especially important in zone valves, since an excessive difference between inlet and outlet can prevent the mechanism from closing properly. Therefore, this value must be checked during the hydraulic calculation of the circuit.

230 V electric actuator

The actuator of the V4043H1122/U operates with a 230 V AC, 50 Hz supply. Its nominal power consumption is approximately 9.6 VA, with a current close to 0.04 A.

The valve uses a two-position actuator, so it is designed to work fully open or fully closed and not for continuous proportional flow modulation.

Integrated SPDT auxiliary contact

The V4043H model includes an end-switch SPDT auxiliary contact. This contact allows the valve position to be used as an electrical signal to coordinate other components in the installation.

For example, it can be used to enable the operation of a boiler or circulation pump once the valve has reached the corresponding position. Resideo specifies a capacity of 2.2 A at 220-240 V AC and 50 Hz for this auxiliary contact.

Opening in approximately 15 seconds

The nominal opening time indicated by Resideo for this valve is approximately 15 seconds. The motorized mechanism opens progressively until it reaches the required final position.

When power is interrupted, the spring mechanical return brings the mechanism back to the closed position, without the need to electrically power the motor during closing.

Manual override

The valve includes a manual opening lever that allows the mechanism to be operated when no electrical power is available. This function is useful during certain filling, draining, bleeding, commissioning or installation checking operations.

When electrical operation is restored, the valve can return to its normal automatic mode.

For water and glycol mixtures

Resideo specifies this valve for controlling water and water mixtures with up to 50% glycol, in accordance with the conditions indicated by VDI 2035. This makes it suitable for hydronic heating and cooling circuits that require antifreeze protection.

The permitted fluid temperature range is 5 to 88 °C, covering the usual conditions of many water-based HVAC and heating systems.

Durable construction

The valve body is made of brass, while the seat is also brass. The stem is made of stainless steel and the shut-off element is made of NBR, with EPDM seals.

This combination of materials is designed to provide reliable operation in closed hydronic circuits within the pressure, temperature and water quality limits established by Resideo.

Simplified maintenance

One of the advantages of the V4043H series is that the complete motorized head can be removed or replaced without disconnecting the hydraulic body from the pipe or draining the system. The motor can also be replaced without removing the valve body.

This design greatly simplifies maintenance tasks when the intervention only affects the actuator or its electrical components.

Compact installation

Resideo describes the V4043H series as a compact solution to facilitate installation where available space is limited. The unit is supplied with an approximately 1-meter electrical cable, making connection to the control system easier.

Installation must respect the flow direction indicated on the body and the mounting positions established by the manufacturer. The head must remain accessible to facilitate future inspection and maintenance tasks.

Typical applications

• Domestic heating installations.
• Zone-divided heating systems.
• Independent hydronic circuits.
• Radiator installations.
• Water-based HVAC systems.
• Small commercial installations.
• Hot or cold water control.
• Circuits with compatible water and glycol mixtures.
• Installations where the valve must be coordinated with a pump or boiler via auxiliary contact.

Technical data of the Resideo V4043H1122/U

• Manufacturer: Resideo.
• Family: V4043H.
• Reference: V4043H1122/U.
• Application: hydronic control.
• Valve type: motorized zone valve.
• Number of ways: 2.
• Configuration: straight-through.
• Control: two-position, on/off.
• De-energized position: closed.
• Action: spring return to closed.
• Connection: BSPP female thread.
• Size: 1".
• Nominal diameter: DN25.
• Kvs: 8.6.
• Maximum operating pressure: 8.6 bar.
• Maximum closing differential pressure: 0.45 bar.
• Voltage: 230 V AC.
• Frequency: 50 Hz.
• Power consumption: 9.6 VA.
• Current: 0.04 A.
• Nominal opening time: 15 seconds.
• Fluid temperature: 5-88 °C.
• Maximum ambient temperature: 52 °C.
• Relative humidity: 5-95%, non-condensing.
• Auxiliary contact: SPDT.
• Auxiliary contact rating: 2.2 A at 220-240 V AC, 50 Hz.
• Body: brass.
• Seat: brass.
• Stem: stainless steel.
• Shut-off ball: NBR.
• Seals: EPDM.
• Manual opening: yes.
• Cable length: 1 m.

1" motorized valve for zone control

The Resideo V4043H1122/U combines a 1" connection, Kvs 8.6, 230 V actuation, spring return and SPDT auxiliary contact to automate the control of heating and cooling circuits. Its normally closed configuration keeps each zone isolated whenever there is no demand.

The possibility of manual opening and replacing the motorized head without draining the circuit makes both commissioning and later maintenance easier. For correct operation, special attention must be paid to the maximum differential pressure of 0.45 bar, the temperature range and the electrical and hydraulic instructions provided by Resideo.