Dosing valve for powder dosing

Dosing valves for accurate and controlled product dosing

Dosing valves are HECHT valves that enable accurate dosing and shut-off of powders, granulates and bulk materials, including containment applications within industrial processes. The product flows through a valve with an adjustable opening, with flow controlled via mechanical, pneumatic or vibrating technology, transitioning from coarse to fine dosing; as soon as the desired quantity is reached, the valve closes fully for an accurate and repeatable dosing with minimal deviation. Dosing valves are used in the pharmaceutical industry (APIs, excipients), the chemical and fine chemical industry, the food industry, biotechnology and bulk solids handling. Key characteristics are continuous or batch operation, suitability for poorly flowing products, a hygienic and low-dust design, easy integration into existing installations and low maintenance requirements. Depending on product properties and desired accuracy, various dosing principles are available, including vibrating dosing valves that prevent bridging.

They form an essential part of processes where accuracy, product quality and process control are paramount.

Applications

Dosing valves are used in:

• Pharmaceutical industry (APIs, excipients)
• Chemical and fine chemical industry
• Food industry (ingredients, additives)
• Biotechnology
• Bulk solids handling and powder processing

Product overview

Dosing valves – controlled flow and accurate dosing

Dosing valves provide a controlled product flow and can perform both coarse and fine dosing.

Operating principle:

• Product flows through a valve with an adjustable opening
• Flow is controlled via mechanical, pneumatic or vibrating technology
• Transition from coarse to fine dosing is possible
• The valve closes fully once the desired quantity is reached

This results in accurate and repeatable dosing with minimal deviation.

Key characteristics

• Accurate dosing of powders and granulates
• Capable of coarse and fine dosing
• Continuous or batch operation
• Suitable for poorly flowing products
• Hygienic, low-dust design
• Easy integration into existing installations
• Low maintenance requirements

Technologies and versions

Depending on product properties and desired accuracy, various dosing principles are possible:

Vibrating dosing valves

• Ensures an even product flow
• Prevents bridging and clumping
• Suitable for fine and poorly flowing powders

Valve or gate shut-offs with dosing function

• For controlled opening and closing
• Applicable in both coarse and fine dosing

Flexible dosing systems (hose principle)

• No mechanical parts in the product flow
• Gentle and hygienic dosing
• Highly suitable for sensitive products

Process capabilities

• Dosing bulk solids in weighing and filling systems
• Continuous or batch-wise product feed
• Integration with weighing systems for accurate final dosing
• Processing of poorly flowing or sticky products
• Dust-free product handling

Key benefits

• High accuracy: reproducible dosing down to gram level
• Process control: precise control of product flow
• Flexibility: suitable for various products and applications
• Efficiency: less product loss and faster processing
• Reliability: stable operation, even with difficult products
• Hygiene: suitable for GMP and food applications

Technical specifications (indicative)

• Capacity: depending on product and application
• Accuracy: down to a few grams possible
• Operation: batch or continuous
• Drive: pneumatic, electric or mechanical
• Material: stainless steel (304 / 316L), special alloys

Options:

• Vibration motor for flow improvement
• Integration with weighing systems
• ATEX version
• CIP/SIP cleaning
• Automation and PLC control
• Hygienic design (GMP)

Typical applications

• Dosing raw materials in production processes
• Filling containers, drums and big bags
• Feeding ingredients into mixers or reactors
• Precision dosing in pharmaceutical and chemical production
• Continuous feed in transport and processing systems

See also: containment dosing valves

• Mechanically moved vibrating dosing flap
• Strong high-frequency vibrations (approx. 300-500Hz)
• Easy regulation of a continuous product flow
• High throughput rates
• Reduction of incrustations
• Coarse and fine flow dosing down to a few grams
• Easy integration into various filling and bottling stations