Working Principle And Characteristics Of Sanitary Stainless Steel Flange Check Valve

For dairy, beverage, and sauce lines, backflow contaminates products and damages pumps. A sanitary check valve with flanged ends prevents reverse flow automatically – no manual intervention. Installation: align flanged ends with pipe flanges, insert a sanitary gasket, and tighten bolts in a star pattern to 40–50 N·m (2" size). Available in 1"–4", SS304/SS316L, 0–10 bar, -20°C to 120°C with EPDM, silicone, or NBR seals. The flanged design stays secure in permanent piping.

How a Flanged Sanitary Check Valve Works

The valve uses a spring‑loaded disc or ball that opens when forward pressure exceeds cracking pressure. When flow stops or reverses, the disc or ball returns to the seat, blocking backflow. Flanged connections offer:

• Secure mounting – bolts hold the valve firmly.

• Easy removal – unbolt for inspection or cleaning.

• Gasket sealing – compressed gasket prevents external leaks.

A sanitary ball check valve uses a spherical ball that lifts during forward flow and seals against the seat during reverse flow. This hygienic check valve design is common in dairy and beverage processing.

Performance Specifications (Flanged Type)

Design Features

• Flanged ends – secure for permanent piping.

• Spring‑loaded disc or ball – fast response to flow changes.

• FDA‑compliant seals – EPDM, silicone, or NBR for food contact.

• Electropolished surfaces – Ra ≤ 0.8 µm resists bacterial adhesion.

• Vertical or horizontal mounting – flexible installation.

Advantages for Food & Beverage

• Automatic backflow prevention – no operator action required.

• Low cracking pressure – opens with minimal forward flow.

• Easy inspection – unbolt without cutting the line.

• CIP compatible – cleans in place without disassembly.

• Handles water, oil, dairy, and beverages.

Typical Applications by Sector

• Dairy – milk, cream, yogurt transfer.

• Beverage – beer, wine, juice, soft drinks.

• Edible oils – filling and transfer.

• Sauces & dressings – viscous products.

• CIP circuits – stops cleaning solution backflow.

• Heat exchangers – prevents reverse flow damage.

Installation and Maintenance

1. Inspect flange faces and gasket for damage.

2. Align flanged ends with pipe flanges – insert gasket.

3. Tighten bolts evenly (star pattern) to 40–50 N·m.

4. Test – ensure forward flow opens disc/ball.

5. Annually inspect seals and seat – replace if worn.

Sanitary check valves of this flanged type provide reliable backflow protection across food processing. Their spring‑loaded disc or ball responds automatically, safeguarding pumps and heat exchangers. With 0–10 bar rating and FDA‑compliant seals, they suit water, oil, dairy, and CIP applications. Acting as a hygienic non return valve, the design ensures product integrity and system safety in daily operation.

Hygienic Stainless Steel Flanged Check Valve

• J&O can supply Sanitary Tri Clover Check Valve, Hygienic Welding Check Valve, Sanitary Male Check Valve, Sanitary Union Type Check Valve, Hygienic Flanged Type Check Valve.
• Check valve can prevent the fluid from flowing back and ensures that it flows in only one direction.
• It can be used to prevent the less of prime of the pump and to avoid pipe-hammering.
• It is used in the food-processing, beverage, wine-making, oil-making, cosmetics, pharmaceutical and chemical industries.
• The valve opens when the pressure of the fluid exceeds the pressure exerted by the pump spring. 
• When the two pressures are equalized, the valve closes. A stronger counter-pressure allows the valve to close.

Product Description

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