Honeywell VR434VA5009-1000 gas valve DN34

Honeywell VR434VA5009-1000 gas solenoid valves, class “A”, are used to regulate the supply of gaseous fuel to various devices, including gas burners, boilers, furnaces and waste incinerators. They are suitable both for systems with spark ignition of the burner and for systems with a pilot burner.

These valves are equipped with two main valves: V1 and V2. V1 opens and closes quickly at all times, while V2 can adjust the gas flow both quickly and slowly, and also has a configurable opening. There is a pressure control valve between V1 and V2.

The main body is equipped with 4 flanged connections on each side, designed for the installation of various devices, such as the C60VR series pressure switches, intermediate pressure relays and valve inspection systems (VPS) in combination with a pressure switch. These components can be placed in different parts of the main gas valve body of the Honeywell VR434VA 5009-1000.

Technical specifications

– Body material: Made of aluminum alloy by injection molding.

– Mesh filter: Contains a fine mesh (diameter 0.34 mm) made of AISI 303 steel. It is cleaned by unscrewing the inlet flange screws. Meets the requirements for mesh filters according to EN 161.

– Closing spring: Made of AISI 302 steel.

– Valve plunger: Coated with Fe 360.

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

– Minimum adjustment capacity: 1 m3/h

. – Maximum operating pressure: 200 mbar.

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

– Classification of the regulator: Class C according to EN 126/EN 88.

– Supply voltage: 230 V~, 50/60 Hz (mains). Other voltages are available on request.

– Ambient temperature: -15 to 60 °C.

– Flange kit: Includes 1 flange with sealing plug, 1 sealing ring and 4 screws, as well as 1 installed pressure measuring fitting.

– Housing: Protected from penetration of solid objects larger than 1 mm (IP 40).

Design and principle of operation

Servo-controlled combined gas valves of the VR434 VA 5009-1000 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 VR434VA5009-1000 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 VR434VA5009-1000 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.

Pressure measurement points

The Honeywell VR434VA 5009-1000gas valve has a number of connection points for pressure measurement, pressure switch installation or IP applications.

The following pressures can be measured:

• P – kindling gas

• 1+2 – inlet pressure

• 3 – intermediate pressure

• 4 – exhaust pressure

The corresponding numbers are indicated on the sides of the valve.

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 VR434 VA 5009-1000 combined gas valves can be used in devices conforming to the European standards of the EN 60335 series, which establish requirements for

The Resideo VR434VA 5009-1000 CVI valves also comply with all electromagnetic compatibility standards for non-industrial and industrial installations.