BURKERT 325978 Type 6407 is a servo-assisted 2/2-way piston valve. The fixed coupling between the pilot valve and the piston provides an opening of the valve without a pressure difference. As a piston valve, the Type 6407 is particularly suitable for media such as gas and steam, as well as liquids with low operating temperatures below 0 °C. The stopper and the core guide pipe are welded together to enhance pressure resistance and leak-tightness. The coils are moulded with chemically resistant epoxy. In combination with a plug according to DIN EN 175301-803 Form A, the valve satisfies the IP65 degree of protection.

Key Features

• Servo-assisted piston valve up to DN 50 orifice (Model 325978 is DN 20)
• Safe opening with hard-coupled piston system without differential pressure
• Vibration-resistant, push-over coil system
• Suitable for neutral gases and liquids (e.g., compressed air, water, hydraulic oil, hot water, and steam)

Circuit Function

Circuit function A (CF A): 2/2-way solenoid valve, servo-controlled, normally closed.

Material Specifications

No.	Element	Material
1	Coil	Epoxy
2	Stopper	Stainless steel 1.4113/434
3	Spring	Stainless steel 1.4310/301
4	Armature guide tube	Stainless steel 1.4303/305/308
5	Core	Stainless steel 1.4113/434
6	Cover	Brass
7	Seal	PTFE
8	Piston ring	PTFE
9	Sealing ring	Graphite
10	Plunger	Brass
11	Piston seal	PTFE
12	Body	Brass

Dimensions

Standard variant DN 13…DN 32

Note

• Dimensions in mm
• The dimensions D1 and F1 apply to G thread.
• The dimensions D2 and F2 apply to NPT thread.
• The dimensions D3 and F3 apply to Rc thread.

Safety and Installation

Risk of injury from high pressure and escaping medium

• Switch off the pressure before working on the device or system. Vent or drain the lines.

Risk of injury from electric shock

• Switch off the power supply before working on the device or system. Secure against reactivation.
• Observe the applicable accident prevention and safety regulations for electrical devices.

Risk of injury due to improper installation

• Installation must always be carried out by trained technicians with the appropriate tools.
• Secure the system against unintentional activation.
• Ensure a controlled restart after installation.

Before installation:

• Installation position: any, preferably actuator facing up.
• Clean pipelines of dirt.
• Install a dirt trap upstream of the valve inlet (≤ 500 µm).

Installation:

• Hold the device on the body using an appropriate tool (e.g. open-end wrench) and screw into the pipeline.
• The valve body must not be installed under tension. Seal material must not get into the device.
• Observe the flow direction: the arrow on the body indicates the flow direction.