Danfoss VL 2 and VL 3 Regulating Valves

Product Overview

The Danfoss VL 2 and VL 3 valves are high-quality, cost-effective solutions for most water and cooling applications. They are designed for combination with various Danfoss actuators.

VL 2: 2-port valve, flanged connection.

VL 3: 3-port valve, flanged connection.

Image of the VL 2 two-port regulating valve with flanges.

Image of the VL 3 three-port regulating valve with flanges.

Features

• Hermetic construction for DN 15-80.
• Push-in mechanical connection compatible with AMV(E) 335 and AMV(E) 435 actuators.
• Available as specialized 2-port and 3-port valves.
• Suitable for diverting applications (3-port).

Basic Data

• Nominal Diameter (DN): 15-100
• Flow Coefficient (kvs): 0.63 - 145 m³/h
• Pressure Rating (PN): 6
• Temperature Range: 2°C to 120°C for circulating water or water/glycol mixture up to 50%. (Note: A shaft heater is recommended for temperatures between -10°C and +2°C).
• Connections: Flanged connections PN 6, according to EN 1092-2.
• Compliance: Pressure Equipment Directive 97/23/EC.

Actuator Compatibility

Valves are designed for combination with the following actuators:

• DN 15-50: AMV(E) 335, AMV(E) 435, or AMV(E) 438 SU. Also AMV(E) 25 (SU/SD) or AMV(E) 35 (with adapter 065Z0311).
• DN 65-80: AMV(E) 335 or AMV(E) 435. Also AMV(E) 56 (with adapter 065Z0312).
• DN 100: AMV(E) 55, AMV(E) 56, AMV(E) 655, AMV(E) 658 SU/SD, or AMV(E) 659 SD.

Combinations with other actuators are described in the accessories section.

Additional Equipment - Adapter

Additional Equipment - Shaft Heater

Service Kits

Technical Data Details

¹) Maximum permissible differential pressure in the valve valid for the entire operating range of the electric motor valve (actuator function).

²) For AMV(E) 55 actuator.

³) A shaft heater is recommended for temperatures between -10°C and +2°C.

⁴) For DN 100, red bronze CuSn5Zn5Pb5 (Rg 5).

Pressure and Temperature Diagram

Diagram showing the maximum allowable working pressure as a function of medium temperature for PN 6 flanged connections (EN 1092-2). The diagram illustrates the operating range for different valve body materials (EN-GJL-250 (GG-25)).

Valve Characteristics

Valve characteristic curve for 2-way (A-AB) connection, showing capacity versus stroke percentage.

Valve characteristic curves for 3-way (A-AB, B-AB, A+B-AB) connections, showing capacity versus stroke percentage.

Disposal

Before disposal, the valve must be dismantled, and the components sorted into different material groups.

Installation

Before installing the valve, pipes must be cleaned of abrasive material. The valve must be installed according to the flow direction indicated on the valve body. Mechanical stress on the valve body from piping is not permitted. The valve must not be exposed to vibrations.

The valve can be installed in a horizontal or vertical position. Installation with the stem pointing downwards is not permitted.

Note: Install a dirt trap upstream of the valve (e.g., Danfoss FVR/FVF).

Diagram showing connection of AMV(E) 335/435 actuators to VL valves.

Diagram showing connection of AMV(E) 25/35/438 SU actuators to VL valves.

Diagram showing connection of AMV(E) 55/56 actuators to VL valves.

Diagram showing connection of AMV(E) 65x actuators to VL valves.

Mixing or Diverting Connection:

A 3-port valve can be used as either a mixing or a diverting valve (Figure 1). If the 3-port valve is installed as a mixing valve, where connections A and B are inlets and connection AB is the outlet, the valve can be used in mixing applications (Figure 2) or diverting applications (Figure 3).

A 3-port valve can also be installed as a diverting valve in diverting applications (Figure 4), meaning connection AB is the inlet, and connections A and B are the outlets.

Note: The maximum closing pressure for mixing and diverting applications is not the same. Refer to the values specified in the technical data.

Figure 1: Mixing or diverting connection for 3-port valves.

Figure 2: Mixing valve used in mixing application.

Figure 3: Mixing valve used in diverting application.

Figure 4: Diverting valve used in diverting application.

Sizing

Sizing diagram plotting flow rate (l/s, m³/h) against pressure drop (kPa) for various kvs values. (100 kPa = 1 bar = ~ 10 m H₂O).

Example:

Design Data: Flow rate: 6 m³/h, System pressure drop: 55 kPa.

Find the horizontal line representing the flow rate of 6 m³/h (line A-A). The valve authority is determined by the equation: Authority, α = Δp₁ / (Δp₁ + Δp₂), where Δp₁ is the pressure drop across the fully open valve, and Δp₂ is the pressure drop across the rest of the circuit with the valve fully open.

An ideal valve would have a pressure drop equal to the system pressure drop (i.e., authority of 0.5). If Δp₁ = Δp₂, then α = Δp₁ / (2 × Δp₁) = 0.5.

In this example, an authority of 0.5 would be met by a valve that creates a pressure drop of 55 kPa at the given flow rate (point B). The intersection of line A-A with the vertical line from point B falls between two diagonal lines, indicating no ideal valve size exists.

The intersection of line A-A with the diagonal lines indicates the pressure drop achieved by actual valve sizes. For instance, a valve with a kvs of 6.3 would result in a pressure drop of 90.7 kPa (point C), giving an authority of 90.7 / (90.7 + 55) = 0.62. A valve with a kvs of 10 would result in a pressure drop of 36 kPa (point D), giving an authority of 36 / (36 + 55) = 0.395.

Generally, for 3-port applications, a smaller valve is preferred to achieve a higher authority (above 0.5) for better regulation. However, this increases the overall pressure drop, and the system designer should verify compatibility with pump head, etc. An ideal authority is 0.5, with a preferred range between 0.4 and 0.7.

Construction

Details of valve construction (possible variations exist):

VL 2 DN 15-80

1. Valve body
2. Valve insert
3. Valve cone
4. Valve spindle
5. Moving valve seat (displaced)
6. Seal

VL 3 DN 15-80

1. Valve body
2. Valve insert
3. Valve cone
4. Valve spindle
5. Valve seat
6. Displacement chamber
7. Seal

VL 2 DN 100

1. Valve body
2. Valve insert
3. Valve cone
4. Valve spindle
5. Blind flange

VL 3 DN 100

1. Valve body
2. Valve insert
3. Valve cone
4. Valve spindle

Dimensions

Diagrams showing valve dimensions with various actuator configurations.

VL 2 (DN 15-80) Dimensions

Note: If a shaft heater is used, dimension H₁ increases by 28 mm, and H₂ by 32 mm.

VL 3 (DN 15-80) Dimensions

Note: If a shaft heater is used, dimension H₁ increases by 28 mm, and H₂ by 32 mm.

VL 2 and VL 3 (DN 100) Dimensions

Note: If a piston heater is used, dimension H remains the same.