Pressure Reducing Valve with R1" Threaded Connections

The Resideo D05FS-1A pressure reducing valve is designed to reduce and stabilize pressure in potable water installations, protecting pipes, fittings, appliances, and other components against excessive pressure from the supply network. This version features 1" threaded connections, nominal diameter DN25, and a Kvs value of 3.7 m³/h, making it suitable for domestic installations and, within its operating conditions, also for commercial and industrial applications.

Its balanced seat design helps maintain a stable downstream pressure even when significant fluctuations occur in inlet pressure. The valve accepts a maximum inlet pressure of 25 bar and allows the outlet pressure to be adjusted between 1.5 and 6 bar, with a factory preset of 3 bar to simplify commissioning.

Main features of the Resideo D05FS-1A

• Brand: Resideo.
• Range: Braukmann D05FS.
• Reference: D05FS-1A.
• Type: pressure reducing valve.
• Application: potable water installations.
• Design: balanced seat.
• Connection: R 1".
• Nominal diameter: DN25.
• Connection type: set of external threaded fittings.
• Kvs: 3.7 m³/h.
• Maximum inlet pressure: 25 bar.
• Adjustable outlet pressure: from 1.5 to 6 bar.
• Factory preset: 3 bar.
• Minimum pressure drop: 1 bar.
• Body: dezincification-resistant brass.
• Diaphragm: EPDM.
• Seals: EPDM.
• Adjustment scale: integrated.
• Internal cartridge: replaceable.

Water pressure reduction and stabilization

The main function of the Resideo D05FS is to convert a high or variable inlet pressure into a lower, stable outlet pressure. In this way, it helps protect downstream components from the effects of excessive pressure.

Installing a pressure reducing valve can also help reduce water consumption and lower hydraulic noise produced in pipes and fittings. By operating at a pressure adapted to the actual needs of the installation, unnecessarily high flow rates are avoided and the overall operating conditions are improved.

Balanced seat against pressure variations

The D05FS uses a balanced inlet pressure system. Thanks to this design, fluctuations that may occur in the supply network have minimal influence on the regulated downstream pressure.

Operation is based on the balance between the force of the regulating spring and the pressure acting on the diaphragm. When water is being used and the outlet pressure drops, the mechanism opens the valve until the selected value is restored.

When consumption stops, downstream pressure rises again and the mechanism reduces the flow until balance is restored. This principle makes it possible to maintain a stable supply pressure within the limits defined by the manufacturer.

Adjustable pressure from 1.5 to 6 bar

The downstream pressure can be adjusted between 1.5 and 6 bar using the control located on the top of the valve. The selected pressure is displayed directly on the integrated adjustment scale, making setup easier during commissioning.

The valve is supplied with a factory preset of 3 bar. This value can later be changed to suit the specific requirements of the installation, always within the permitted adjustment range.

The maximum permissible inlet pressure is 25 bar, and Resideo specifies a minimum pressure drop of 1 bar.

1" threaded connections and DN25

The D05FS-1A reference corresponds to the version with nominal diameter DN25 and 1" connection fittings. Variant A is supplied with a set of external threaded connections, which facilitates both initial installation and valve removal during future maintenance operations.

For this size, Resideo specifies a Kvs of 3.7 m³/h. This value indicates the hydraulic capacity of the valve and should be considered together with the expected flow rate and available pressure loss when sizing the installation.

Dezincification-resistant brass body

The body is made of dezincification-resistant brass, a material especially suitable for components intended for continuous contact with potable water.

The internal cartridge is made of high-quality synthetic material and uses an EPDM diaphragm. The seals also use EPDM, and the regulating spring remains separated from the potable water during operation.

Resideo states that the materials used comply with UBA requirements and have ACS approval.

Fully replaceable internal cartridge

The internal regulating assembly can be completely replaced. This feature simplifies valve maintenance, as it allows the main functional components to be renewed while keeping the main body installed when service conditions permit.

The modular construction simplifies inspections and helps ensure long-term system maintenance.

Integrated pressure scale

The top control includes a regulating scale that allows the selected value to be read directly on the valve. This makes adjustment easier during installation and allows the outlet pressure to be modified without having to interpret approximate control positions.

For an accurate check of the actual circuit pressure, a pressure gauge compatible with the installation can be used.

Operating temperature

Resideo’s current documentation for this reference specifies a maximum fluid temperature of 30 °C under the standard conditions indicated for the product. The valve can operate with water at temperatures up to 70 °C when the maximum pressure is limited to 10 bar.

The specified operating ambient temperature is between 5 and 55 °C. The valve must be installed in a location protected from frost and within the environmental limits specified by the manufacturer.

Application in potable water installations

Resideo develops the D05FS series primarily for the protection of domestic potable water installations against excessive supply pressure. It can also be used in commercial or industrial installations as long as the service conditions remain within the product specifications.

Typical applications include:

• Domestic water supply networks.
• Internal residential plumbing installations.
• Residential buildings.
• Commercial installations.
• Networks receiving a supply pressure higher than required.
• Installations with frequent inlet pressure variations.
• Protection of fittings, sanitary fixtures, and equipment connected to the water network.

Hydraulic noise reduction

Excessive network pressure can increase water flow velocity and generate noise in pipes, valves, and points of use. By reducing the pressure and keeping it at a more constant level, the D05FS helps minimize flow noise within the installation.

This feature improves the operating conditions of the network and is especially useful in installations where the available pressure is significantly higher than necessary.

Installation recommendations

The valve must be installed respecting the flow direction indicated on the body and in a position that allows easy access to the adjustment control and internal cartridge.

Resideo recommends installing it in an easily accessible location protected from frost to simplify inspection and maintenance tasks. Installation must be carried out in accordance with applicable regulations and the manufacturer’s technical instructions.

It is also advisable to install shut-off valves before and after the assembly to facilitate future interventions on the installation.

Dimensions of the Resideo D05FS-1A

• Connection: R 1".
• Nominal diameter: DN25.
• Total length: 176 mm.
• Body length without fittings: 97 mm.
• Height: 124 mm.

Technical data of the Resideo D05FS-1A pressure reducing valve

• Manufacturer: Resideo.
• Family: Braukmann D05FS.
• Reference: D05FS-1A.
• Type: pressure reducing valve.
• Medium: potable water.
• Design: balanced seat.
• Connection: R 1".
• Nominal diameter: DN25.
• Connection type: external threaded fittings.
• Kvs: 3.7 m³/h.
• Maximum inlet pressure: 25 bar.
• Outlet pressure: 1.5-6 bar.
• Preset: 3 bar.
• Minimum pressure drop: 1 bar.
• Maximum fluid temperature: 30 °C under the standard conditions indicated.
• Maximum temperature at pressure limited to 10 bar: 70 °C.
• Ambient temperature: 5-55 °C.
• Permissible relative humidity: 25-85%, non-condensing.
• Body: dezincification-resistant brass.
• Diaphragm: EPDM.
• Seals: EPDM.
• Cartridge: high-quality synthetic material, replaceable.
• Regulating spring: separated from potable water.
• Adjustment scale: integrated.
• Length: 176 mm.
• Height: 124 mm.
• Approval: ACS.
• Certification: DVGW.

Compact pressure reducing valve for water installations

The Resideo D05FS-1A combines a 1" connection, DN25 diameter, Kvs 3.7 m³/h, and pressure regulation between 1.5 and 6 bar in a compact valve designed to stabilize pressure in potable water installations.

Its balanced seat helps keep downstream pressure constant despite network fluctuations, while the dezincification-resistant brass body, replaceable cartridge, and integrated adjustment scale make both operation and maintenance easier.

To ensure proper performance, the pressure and temperature conditions, flow direction, and installation and maintenance instructions specified by Resideo must be observed.