Burkert Type 6407 - Servo-assisted Piston Valve

The Burkert Type 6407 valve is a servo-assisted piston valve. It has a fixed coupling between its pilot valve and piston, enabling it to open without any pressure difference. The valve is particularly suitable for media such as gas and steam, and liquids with a low operating temperature (below 0 𐩑C). The main features of the valve are the following:

• The valve is servo-assisted and available up to the DN50 orifice.
• The plug and the central guiding tube are welded together to improve their ability to withstand pressure and prevent leaks.
• The valve has a push-over coil system that's vibration-resistant.
• A firmly connected piston system ensures safe opening without any pressure difference.
• Coils with kick and drop are available to reduce power consumption. This involves applying a higher voltage during the initial energization (kick) and then reducing it to a lower level for sustained operation (drop).
• Explosion-proof versions are available.

Is Burkert 6407 servo-assisted valve the right choice for you?

The Bürkert 6407 servo-assisted piston valve is reliable and durable; hence, they suit tough circumstances. This valve might be the right choice for your application if:

• The application demands a leak-free valve structure
• The valve is installed in a high-vibration and potentially explosive atmosphere
• Reducing overall power consumption is a concern

General technical data

Product properties

Material

• Seal: PTFE/graphite
• Body: Brass
• Coil: Epoxy
• Orifice: DN 13 - DN 50
• Solenoid coil thermal insulation class: H

Performance data

The valve is designed to operate continuously without overheating, meaning it can run at 100% capacity. The Kick and Drop coil, responsible for opening and closing the valve, can handle a maximum of 6 switching cycles per minute (open and close up to six times per minute).

Switching time

The switching time is the time it takes for the valve to go from one state to another, typically from fully open to fully closed or vice versa. Table 1 shows the valve's opening and closing times for various orifice sizes.

Table 1: Opening and closing times of Burkert Type 6407 servo-assisted valve

Orifice size	Opening time (ms)	Closing time (ms)
DN 13	30	250
DN 20	30	250
DN 25	60	700
DN 32	80	900
DN 50	500	2000

Electrical data

Power consumption

Table 2 summarizes the valve's power consumption for AC and DC signals.

• Inrush power: Inrush power is the valve's maximum power consumption when initially powered on. It represents the highest power requirement needed to activate the valve's solenoid and overcome the initial resistance to move the valve from its closed position to its open position.
• Holding power: After the valve has been activated and moved to its desired position, it requires a certain power level to maintain that position, known as the holding power. It is generally lower than the inrush power since it only needs to counteract small forces trying to change the valve's position.
• Cold performance: Cold performance indicates the power consumption and behavior of the valve at a relatively lower temperature, usually at the starting point of operation. When a valve is cold, i.e., at a lower temperature, it may experience some initial resistance or stiffness in its moving parts. This resistance could result in slightly higher power consumption during the startup phase.
• Warm performance: Warm performance refers to the valve's power consumption and behavior when operating at a normal or warmed-up temperature. It represents the valve's power usage and efficiency during steady-state operation.

Table 2: Power consumption of Burkert Type 6407 servo-assisted valve

Orifice (mm)	Coil size (mm)	AC		DC
		Inrush power (VA)	Holding power (VA)	Cold performance (W)	Warm performance (W)
13	42	140	41	21	16
13 ATEX	42	-	-	15	12
20	42	150	41	-	-
25	42	160	41	-	-
32	42	170	41	-	-
20 - 25 ATEX	42	-	-	-	-
20 - 32	65	-	-	28	21
50	72	-	-	39	30

Voltage

The voltages available are 24 V/DC, 24 V/50 Hz, 24 V/60 Hz, 110 V/50 Hz, 120 V/60 Hz, 230 V/50 Hz, and 240 V/60 Hz. Other voltages can be designed on request.

Medium

The valve works on neutral gasses and liquids like compressed air, water, hydraulic oil, hot water, and steam.

Port connection and communication

• Electrical connection: Cable plug for cable Ø 7 mm acc. to DIN EN 175301-803 Form A
• Port connection: G ½, G ¾, G 1, G 1 ¼, G 1 ½, G 2, G 2 ½ NPT ½, NPT ¾, NPT 1, NPT 1 ¼, NPT 1 ½, NPT 2

Approvals and certifications

The valve satisfies IP65 degree of protection when operated in combination with a plug according to DIN EN 175301-803 Form A.

Circuit functions

The valve is normally closed, has two ports (inlet and outlet), and is controlled by an external servomechanism.

Other features

Burkert Type 6407 servo-assisted piston valve can be combined with:

• Type 2518 and Type 2509 cable plugs, Form A, following the DIN EN 175301-803 standard. This allows for a secure electrical connection between the valve and each cable plug.
• Type 1087 timer Form A, according to DIN EN 175301-803. The timer helps introduce a delay in the opening or closing of the valve after receiving a signal or command. This is beneficial in certain applications where precise timing is required, such as controlling the fluid flow duration, regulating dosing processes, or coordinating the valve's operation with other components in a system.