Series WK 70 clean valves operate dependably in the pharmaceutical, biotech, food, cosmetic, paint, chemical and semi-conductor manufacturing industries where microbes, media deposits, mineral impurities and cross-contamination can threaten the quality of the product.
The high-purity design, high vacuum rating, high cycle life and pressure/temperature rating of these valves make them ideal for applications from sterile steam to nutrient inlets to high-purity water.
The performance of the WK70 Tube Bore Clean Valve is based on a combination of high standard specifications.
The inside diameter of WK70 valve components are tube bore dimensions so that the valve precisely matches the tubing it is connected to. This prevents buildup of pyrogens or bacteria.
WK70 valves are built of forged parts. From an integrity perspective, forgings are better than castings for clean service because they are stronger, free from crevices, pits, shrinks or inclusions and have better controlled metallurgy.
Low Ferrite Content
WK70 valves are made of 316L stainless steel with ferrite content less than 5 percent. This prevents rouging resulting from minerals and impurities drawn from higher ferrite content metals.
High Integrity Welds
The metallurgy of WK70 body and extended tube ends assures the integrity of the orbital welding. The tube ends have a verifiable sulfur content between .005 percent and .016 percent. Too much sulfur causes a lack of penetration of the orbital welding. With a low sulfur content comparable to that of the process tubing, the quality of the weld is assured.
CE certificate to meet the European Food Safety standards
Flowserve certifies the conformity of the WK70 Worcester valve according to the European food safety legislation, as well as the attached document:
- Regulation (EC) 1935/2004 - Regulations on food contacts.
- Regulation (EC) n. 2023/2006 - Good manufacturing practice.
- Regulation (EU) No. 10/2011 - Legislation for plastic materials and articles in contact with foodstuffs.