FLOW CONTROL / Paper & pulp industries
Fibrous stock, process water and reject streams place different demands on a mill valve. Specify the stream and consistency before choosing the body and sealing arrangement.
Discuss your application
Pulp and paper mills move fibrous stock, process water and reject streams through very different conditions. Identifying the individual stream, consistency and contamination helps separate stock isolation from clean-water duty and more demanding reject handling before the valve configuration is chosen.
The dedicated pulp-valve listing is a starting point for a stock-isolation enquiry. Share consistency, fibre and contaminant information together with pressure, temperature and operating frequency so the team can review the body, closure and sealing arrangement for the actual stream.
A flanged knife gate can be reviewed where the line contains suspended solids or fibres. Clarify the direction of pressure and any buildup experienced at shutdown; higher-consistency or reject-heavy duties may require a different configuration from a general industrial knife gate.
Process-water lines may support a separate butterfly-valve duty from the stock system. Review the pneumatic assembly against water quality, additives, temperature and closing differential pressure, then define the available air, switching sequence and required open/closed indication.
SELECTION / LOOK BEYOND LINE SIZE
Feed stock and rejects may have different solids concentrations. Give the valve location and both normal and maximum consistency rather than applying a single mill-wide value to every line.
Recycled-stock streams can contain unwanted material as well as fibres. Describe the contaminants and any jamming history so the review covers more than a nominal pulp percentage.
A valve used occasionally for maintenance experiences a different operating pattern from one switching frequently. Include cycle frequency, shutdown periods and position-confirmation requirements when discussing the actuator and sealing arrangement.
Body, trim, seals and actuation need to work together under your service conditions.
Include water chemistry, additives and cleaning conditions alongside fibre and solids information. The body and gate materials, seat and packing must be reviewed as a combination for that service rather than chosen from stock consistency alone.
Specify whether pressure can reverse and show the installed orientation. Confirm the quoted valve's sealing direction and operating clearances, including the space needed for gate travel, actuator movement and future servicing.
Reject and high-consistency duties can require dedicated designs. Ask the team to review the actual stream and available configuration; flushing arrangements, scrapers or specialist sealing features should be confirmed rather than assumed to be supplied.
Explore these catalogue configurations, compare their specifications and share your operating conditions with our team.
Explore the catalogue's dedicated pulp valve.
Size Range: 40mm to 600mm Pressure Rating: PN10.
Review knife gate isolation options.
Size Range: 40mm to 600mm Pressure Rating: PN10/ PN16.
Explore automation for suitable process-water duties.
Size Range: 25mm to 1200mm. Pressure Rating: PN10/ PN16.
Final selection depends on the complete valve configuration, fluid compatibility and operating duty. Project-specific approvals and limits are confirmed with the quotation.
BEFORE YOU SPECIFY / PRACTICAL ANSWERS
Questions worth discussing for your paper & pulp industries application.
Ask our teamConsistency describes part of the solids load, but it should be read with fibre, contaminants and the operating pattern. Those details help the team review passage, closure and sealing requirements rather than selecting only from pipe size.
Do not assume so. Reject streams can be more concentrated or contain larger contaminants than the main stock line. Provide the particular stream data and request confirmation of the configuration, including shut-off direction and any specialist features required.
Send its location, photographs, existing dimensions and material details, plus consistency, contaminants and cycle frequency. Explain whether the problem occurs during closing, startup or prolonged shutdown. An installation sketch and failure description make the enquiry more specific.
Share the medium, duty, size, connections and operating conditions.
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