Honeywell VK4125A1009 gas valve

The gas regulator from Honeywell VK4125A1009U plays an important role in the control and ignition system of the burner. It provides reliable ignition and gas flow control for both the pilot and the main burner. This device has a built-in VK4125A 1009U gas valve and a special ignition regulator for more efficient operation.

The Resideo VK4125 A 1009U gas solenoid valve has a standard housing and offers a variety of configuration options, including:

1. Regulation via the throttle valve.

2. Smooth regulation with the possibility of adjustment for various control methods.

3. Start with smooth ignition, using innovative SOFTLITE technology.

4. Pressure control by servo drive.

5. Regulation of the ratio of gas and air in a ratio of 1:1.

6. Electric two-level control mechanism.

The Honeywell VK4125A1009B gas regulator is equipped with two electrical devices:

• precise control of the main valve;

• constant monitoring of the valve position.

This regulator works with different types of gases:

1. heating

2. liquefied

3. natural

General characteristics

• Inlet and outlet are suitable for flanged connection

• Screen: On the input side

• Pressure valve: Top for measuring inlet and outlet pressure

• Gas connection: Inlet: diameter 18.6 mm Outlet: side outlet diameter 18.6 mm: –

• Back pressure: 1st valve: 50 mbar; 2nd valve: 50 mbar

• Ambient temperature: -15 … 60°C

• Maximum inlet pressure: 60 mbar

Management functions

• Maximum operating pressure: 45 mbar

• Leakage requirements: According to EN126

• Performance (by air): 2.4 miles/5 mbar thermal pressure drop

• Performance curve: H30

Electrical Information

• Ratings: 220 … 240 V AC; 50 Hz

• Load: 1st + 2nd operator 48 mA at 220 V AC

Standard operating conditions

1. The inlet pressure of the gas is nominally 25 millibars with dry air and a stable temperature of 20°C.

2. The medium maintains a temperature of 20°C.

3. The diameter of the diaphragm is 2.8 millimeters.

4. The Honeywell VK4125A 1009B valve operates at rated voltage and is installed in an upright position for optimal performance.

5. The ambient pressure remains at 1013 millibars, ensuring reliable operating conditions.

6. The output pressure is recorded using a sensor connected to a pipe with a diameter of 1/2 inch, 10 times the diameter, through a short hose with a length equal to 5 pipe diameters.

7. Gas consumption is measured in cubic meters per hour for maximum accuracy.

General features

The inlet and outlet of the VK4125 A 1009B gas regulator have a diameter of 18.6 millimeters and are connected through flanges. There are different models of this gas valve with different levels of closing force, such as:

•        B + C

•        B + B

•        B + J

At the inlet of the Honeywell VK4125A1009 gas valve there is a built-in fine-mesh filter, not intended for cleaning. If necessary, an additional output filter can be installed. At the bottom of the valve there are holes for mounting to the installation.

There are variants of gas regulators with a side outlet for the main and pilot burners. But such a side outlet can only be used with the flange collector of the burner. In addition, at the outlet of the VK4125A 1009 gas regulator there is a connection for pilot gas with a diameter of 4 mm. It is also possible to install pressure measuring fittings using silicone tubes with a diameter of 4 or 6 mm.

There is a choice of different types of electrical connections, such as connecting to the ignition regulator via a connector or using a plug-in rectifier unit for standard DBI ignition systems. Options for operation at a voltage of 24V are also available for best compatibility with various ignition regulators, with the exception of the S4565/S4585 series regulators.

The principle of operation

VK4125 A 1009 regulators have a positive feedback system (automatic closing of the main valve in case of lack of power supply or excess gas pressure). The system includes a high-tech pressure servo controller and a pressure relief valve that cooperate with each other. When the power supply is supplied, the gas passes through the servo controller and opens the main valve. The system then maintains a constant pressure by regulating the operation of the main valve. This ensures a stable output pressure, even with changes in the input pressure, and emphasizes its reliability in operation.