KREYENBORG VALVE TECHNOLOGY

For the economic operation of complex lines often a melt valve becomes necessary, which regulates the melt flow in a controlled manner or which rather discharges the material out of the running process.

Possible fields of applications are for example:

• Keeping clean of the complete line during the extruder start up
• Discharge of dispensable material for preventing blockages
• Flushing of intermittent severe contamination out of reactor or extrusion lines
• As safety valve in case of interruptions of the production line to prevent an emergency cut-out of the complete line
• Distributing of the melt flow to different down stream lines
• As shut-off valve, two-way valve or diverter valve

Shut-off valve

Shut-off position:
An interruption of the melt flow is caused.

Production position:
The melt flow is guided to the down stream components.

Area of application:
Reactor valve

diverter valve resp. discharge valve

Start-up position:
The material is diverted and discharged out of the process. 

Production position:
The melt flow is guided to the down stream components.

Area of application:

Safety valve for reaction, compounding and extrusion processes.

3/3- way valve (free of dead space)

Depending on position, the piston valve releases different in- and outputs for the melt.

The example shows that the melt optionally may be guided into one of the two or into both outlet channels. Switching between the two output channels is done without pressure variation and without trapped air.

Area of application:
Switching between two production processes (e.g. switching of two large area filters).

6/3-Way valve

Suitable for co-extrusion processes, in order to realize different material blends.

3/2-way valve | 3/2-way switching valve (90° diverting)

Depending on position of the valve piston, another flow direction for the melt flow is caused.

Area of application:
Switching between two production processes (e.g. for underwater pelletizing and film extrusion).

Further variants (e.g. with other output angles of further positions) are deliverable.

FUNCTIONAL PRINCIPLE

The basic functionality of the KREYENBORG melt valves is as resourceful as simple:

The melt flow is guided through a steel ingot in which a hydraulically moveable valve piston is arranged. Different flow channels are embedded in this valve piston. By the hydraulic sliding of the valve piston the melt flow is guided into the necessary melt channel. This causes the diverting and the shutting off of the melt flow resp.

Owing to the quick switching of the hydraulically operated valve piston in any case the complete throughput capacity is immediately available and is immediately completely shut-off resp..

ADVANTAGES

The described construction has a number of positive features for the operation:

• Quick switching
• Rheological optimisation
• Short flow paths
• Heating electrical or with oil / steam
• Very easy handling for the operator
• Automatical switching possible
• Integration into line controls possible
• Numerous special options realisable

MATERIALS

• Suited for the processing of all thermoplastics and thermosets
• For use with the application of low viscous flushing media on request

HYDRAULIC SYSTEM

KREYENBORG valves are executed with a highduty hydraulic system for an especially quick and reliable switching.

The advantages of this technology especially are:

• Low investment costs
• Low operation costs
• Low maintenance requirements
• Safe and simple operation
• No inspections acc. to regulations concerning pressure reservoir

CUSTOMISED SPECIAL SOLUTIONS

• Different coating possibilities for the flow channels
• Customized connection geometries
• Rheologically optimised adaptation to other line components by using adapters
• Different installation positions
• Customized support carts
• High pressure executions
• Integrated borings for melt temperature transducers and melt pressure sensors
• Numerous switching positions of the valve possible, exceeding the mentioned examples
• Crackfilter (e.g. diverter valve upstream gear pumps)

The customer-specific design takes all common European policies into account. Other country-specific standards will be implemented on request.