Honeywell VR434VA5009-0000 gas valve DN34

Honeywell VR434VA5009-0000 CVI valves, which have the possibility of regulation, are used to control the flow of gaseous fuel in a variety of devices, such as gas burners, gas boilers, melting furnaces, incinerators and other gas-consuming devices.

These valves are designed to work in systems with spark ignition of the burner (DBI) and pilot burners (IP). There are two main valves in the kit: V1 and V2. The safety valve V1 opens and closes quickly at all times, while the valve V2 can either react quickly with the possibility of flow control, or slowly with the opening setting and flow control.

A pressure control valve is located between V1 and V2. The main body is equipped with 4 flanged connections for the installation of additional equipment, such as a C60VR series pressure switch at the inlet, a C60VR series intermediate pressure switch or a valve inspection system (VPS) in combination with a pressure switch. These components can be placed in different parts of the main body of the Resideo VR434VA 5009-0000 gas control block.

Technical specifications

• Valve classification: Class A + A according to EN 126/EN 161

• Regulator classification: Class C according to EN 126/EN 88

• Supply voltage: mains 230 V~, 50/60 Hz

• Other voltages – on request.

• Body material: Aluminum alloy, injection molding

• Strainer: fine mesh mesh (diameter 0.34 mm), AISI 303 steel, can be cleaned by unscrewing the inlet flange screws. Meets the requirements for mesh filters according to EN 161.

• Closing spring: AISI 302 steel

• Valve plunger: with Fe 360 coating

• Seals and gaskets: hydrocarbon-resistant types of butadiene-acrylonitrile (NBR) and viton rubber.

• Minimum adjustment capacity: 1 m3/h.

• Maximum operating pressure: 200 mbar

• Ambient temperature: -15 … 60 °C

• The flange kit contains:

1 flange with sealing plug

1 O-ring and 4 screws

1 pressure measuring fitting installed

• Housing: IP 40

Design and principle of operation

Servo-controlled combined gas valves of the VR434VA5009-0000 series are double fault-tolerant shut-off valves of class A.

The valve is opened by excitation of two-position direct-acting actuators. Each actuator consists of a coil and a locking sleeve assembly. Inside the locking sleeve there is a plunger, which is connected to a rubber valve and can move up and down, thereby opening and closing the valve. The plunger is covered with antifriction material. The flow is regulated by means of a variable stroke of the plunger. A strainer made of AISI303 stainless steel is installed between the inlet flange and the main body. The closing spring of the valve is made of AISI302 stainless steel. Seals and gaskets are made of hydrocarbon-resistant butadiene-acrylonitrile (NBR) rubber according to DIN 3535 and EN 291.

The VR434VA5009-0000 valve is a servo system.

The control valve is located between two shut-off valves. When power is supplied to both actuators, the “servo gas” begins to flow through the regulating membrane system. From this chamber, the gas passes into the servo chamber through the intake diaphragm (restriction). The pressure in the servo chamber is regulated by a pressure regulator. The balance between the servo pressure and the pressure under the control membrane determines the opening of the control valve. As soon as the control valve opens, the exhaust pressure generated by the VR434VA 5009-0000 series valve will be perceived by the regulator membrane through the feedback channel. When the force generated by this pressure is greater than the value set by the adjusting screw, the control valve opens, somewhat relieving the operating pressure. This reduces the force directed towards the action of the spring of the control valve, allowing the latter to close proportionally. Thus, the control valve limits the exhaust pressure (pressure applied to the burner) to the set level. As a result, the exhaust pressure is continuously maintained by comparing it with the set pressure and changing the position of the control valve accordingly. This means that regardless of the fluctuations in the intake pressure, the exhaust pressure remains unchanged. When disconnected, a small volume of working gas from the regulator and the membrane chamber exits into the main exhaust chamber. The reference pressure feedback channel then regulates the exhaust pressure by compensating for the difference between the air pressure in the combustion chamber and the pressure at the valve. If pressure adjustment is not required, the regulator spring can be blocked by screwing the adjusting screw until it stops or until the pressure regulation stops. In these cases, the full pressure of the “servogas” opens the control valve as much as the pressure drop will allow.

Exhaust pressure adjustment

• Open the pressure feedback connection (if provided).

• Supply power to both electrical actuators to ensure that gas is supplied to the burner.

• Check the gas supply to the installation by means of a gas meter with a clock mechanism or by means of a pressure gauge connected to the outlet pressure measuring fitting.

• Unscrew the pressure regulator cover screw to open the pressure regulator adjustment screw.

• Slowly turn the adjusting screw with a miniature screwdriver until the pressure gauge shows the required burner pressure. Rotate the adjusting screw clockwise to increase the burner pressure, or counterclockwise to decrease it.

• To exit the control mode (low pressure gas), turn the adjustment screw clockwise until it stops.

• Replace the pressure regulator cover screw.

• Restore the pressure feedback connection (if provided).

Standards

With regard to electrical safety, the Resideo VR434 VA 5009-0000 CVI valves can be used in devices that comply with the European standards of the EN 60335 series, which establish requirements.

The VR434VA5009-0000 gas control unit also meet all standards for electromagnetic compatibility for non-industrial and industrial installations.