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Worcester WK70/74 clean valve

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The Worcester WK70 forged and WK74 cast low-ferrite tube-bore clean ball valves deliver reliable performance in Ireland’s pharmaceutical, biotech, food, cosmetic, paint, chemical, and semiconductor manufacturing industries, where microbes, media deposits, mineral impurities, and cross-contamination must be minimised.

These high-purity valves feature a tube-bore design that precisely matches process tubing to prevent pyrogen or bacteria buildup, with WK70 valves built from 316L stainless steel (guaranteed ferrite content under 1%) and WK74 from CF3M 316L (under 5%) to eliminate rouging risks.

Ideal for sterile steam, nutrient inlets, high-purity water, and high-vacuum applications, they offer bubble-tight shutoff, high-cycle life, steam service capability up to 20 barg, and CE-marked ratings up to 35 bar and 260°C with Fluorofill or reinforced PTFE seats.

Specifications
Technical Data
Advantages
Industries
Applications
Documents
Contact

Specifications

Operating Parameters:

Flows to 565 m³/h (2500 gpm)
Heads to 110 m (350 ft)
Pressures to 17 bar (250 psi)
Temperatures from -30°C (-20°F) to 90°C (200°F)

Materials:

WK70 valves are made of 316L stainless steel with ferrite content less than 5%.

Features:

Full bore tube design
Low ferrite construction
Clean valve design for hygienic service
Quarter-turn operation
Bubble-tight shutoff when used within published pressure/temperature limits

Options:

High-cycle stem seals
Steam-service capable seat options
Weld-end configurations, including butt weld and socket weld
Extended butt weld O/D ends for orbital welding
Actuation options for automated service

Technical Data

High-purity design prevents microbes, media deposits, mineral impurities, and cross-contamination in product-sensitive processes.
Tube-bore dimensions precisely match connected tubing to eliminate pyrogen or bacteria buildup sites.
Metallurgy: Forged WK70 uses 316L stainless steel (<1% ferrite guaranteed); cast WK74 uses CF3M 316L (<5% ferrite) to prevent rouging.
Seats (PTFE, reinforced PTFE, Fluorofill) provide bubble-tight shutoff under high vacuum and high-cycle operation.
Steam capability: Fluorofill seats rated to 20 barg working steam pressure (WSP) for sterile steam service.
Stem seals: High-cycle design ensures external sealing reliability when automated.
High vacuum rating, long cycle life, and strong pressure-temperature performance suit sterile steam, nutrient inlets, and high-purity water applications

Advantages

Tube-bore design precisely matches process tubing to prevent pyrogen or bacteria build up.
Low-ferrite 316L construction eliminates rouging from mineral impurities.
Forged WK70 body offers superior integrity over castings—stronger, free from pits, crevices, or inclusions.
Bubble-tight shutoff with PTFE, reinforced PTFE, or Fluorofill seats, even under high vacuum and high cycles.
High-cycle stem seals ensure reliable external sealing when automated.
0.5 micron standard internal finish (electropolished to 0.25 micron optional) for superior cleanability.
CE-marked per Pressure Equipment Directive, pressures to 35 bar, temperatures to 260°C.
Purge ports available for CIP/SIP applications; high vacuum rating.

Industries

Pharmaceutical and biotech manufacturing
Food processing (wine/spirits, dairy, retort lines)
Cosmetics and personal care (shampoos, creams, detergents)
Chemical processing (solvents, acids, caustics)
Semiconductor and microelectronics
Paint manufacturing
Rubber polymers and monomers

Applications

High-purity water systems
Sterile steam lines
Nutrient and media inlets (biotech/fermentation)
Flush-bottom tank valves
Cleaning acids, caustics, and deionised water lines
Gas and air sparging
Distillation and sterile steam applications
Recirculation loops
High vacuum services
Cryogenic liquids and super-cooled oils
Solvent lines and instrumentation tie-ins
Wine/spirits, hot cooking oils, steam feed lines (food processing)
Shampoos, detergents, white wax (cosmetics)
Lyophilisation/freeze-drying processes
Rubber polymers, monomers, styrene, butadiene slurries (with cavity filler option)

Documents

Series WK 70 74

Contact Us

Contact our Valve Specialist Team

Brendan Merrigan (External) – mob: 087 2598124
Darragh Rodgers- tel: 021 461 7241
Brian Barry – tel: 021 461 7211
Shauna O’Connor – tel: 021 461 7237
Vicki McGrath – tel: 021 461 7207
Cathal Hannon - Tel: 021 461 7200
Ryan Foley - Tel: 021 461 7200
Office - tel: 021 461 7200

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