Honeywell VR434FA5023-1000 gas valve DN34

Honeywell VR434FA5023-1000 Class A gas valves are designed to regulate and control the supply of gaseous fuel to various technical devices, such as powerful gas burners, atmospheric gas boilers, melting furnaces, incinerators and other gas consuming devices.

The Resideo VR434FA 5023-1000 CVI valves are designed for use in systems with spark ignition of the burner (DBI) and with a pilot burner (IP). They are equipped with two main valves: V1 is a safety valve that provides quick opening/closing, and V2 is a second valve capable of operating either fast with flow control or slow with flow control and adjustable opening.

The valve body has 4 flange connections on each side for the installation of additional devices. This allows you to integrate:

– C60VR series inlet pressure switch

– Intermediate pressure switch of the C60VR series

– Valve inspection System (VPS) together with pressure switch

Such components can be placed in various places of the case, providing flexibility of configuration and adaptability to various configurations and requirements of devices.

Technical specifications

– Minimum adjustable capacity: 1 m3/h.

– Maximum working pressure: 200 mbar.

– 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 are possible on request.

– Ambient temperature: -15 … 60 °C.

– Housing: IP 40.

– Body material: Aluminum alloy, injection molding.

– Strainer: Fine mesh mesh (diameter 0.34 mm), made of 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: Coated with Fe 360.

– Seals and gaskets: Resistant to hydrocarbons – made of butadiene-acrylonitrile (NBR) and viton rubbers.

– The flange kit includes:

    – 1 flange with sealing plug.

    – 1 O-ring and 4 screws.

    – 1 pressure measuring fitting installed.

Design and principle of operation

Servo-controlled combined gas valves of the VR434 FA 5023-1000 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 VR434FA5023-1000 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 VR434F A5023-1000 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.

Mounting position

The gas valve can be installed at an angle of plus or minus 90 degrees to the vertical. The distance between the gas valve and the wall/floor must be at least 30 cm.

Standards

With regard to electrical safety, the Honeywell VR434FA5023-1000 gas valves can be used in devices that comply with the European standards of the EN 60335 series, which establish requirements for

The VR434FA 5023-1000 gas solenoid valves also meet all electromagnetic compatibility standards for non-industrial and industrial installations.