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Stainless Steel 304/316L Union Check Valve Non Return Valve

SS304/316L Sanitary Union Check Valve (DIN/SMS Threaded Nut, Non-Return)

Secure your critical sanitary pipelines and prevent costly fluid backflow with the Aomite Sanitary Union Check Valve.

Engineered strictly for the hygienic demands of the dairy, brewery, beverage, and pharmaceutical industries, this non-return valve operates purely on fluid mechanics via a highly responsive internal spring. The standout feature of this specific model is its 'Union' connection type (commonly used in DIN, SMS, and RJT standards). Instead of standard clamps or permanent welds, the valve body is secured by a robust, heavy-duty threaded union nut. This allows plant operators and maintenance engineers to rapidly disconnect and disassemble the valve for CIP inspection or seal replacement using just a standard C-spanner wrench. Precision-forged from SS304/316L with an ultra-smooth internal finish (Ra ≤ 0.8μm).

Quantity:
Color:	SLIVER
Size:	1
Material:	SS304
Availability:





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Model:
13
Brand:
AOMITE

Product Description

Technical Specifications

Parameter	Specification
Product Type	Sanitary Check Valve / Non-Return Valve (NRV)
Connection Style	Union Type (Threaded Nut Connection)
Wetted Material (Forged)	SS304, SS304L, or SS316L Stainless Steel
Internal Surface Finish	Ra ≤ 0.4 ~ 0.8 μm (Mirror Polished for optimal hygiene)
External Surface Finish	Ra ≤ 0.8 ~ 1.6 μm
Available Port Sizes	DN15 to DN150 (1/2" to 6")
Working Pressure	1.0 to 1.6 MPa (10 to 16 Bar)
Standard Compliance	DIN, 3A, SMS, ISO/IDF, BS/RJT, ASME/BPE

Sealing Material Options & Temperature Ratings

Seal Material	Working Temperature Range
EPDM (Standard)	-20°C to +135°C
SILICONE (VMQ)	-50°C to +180°C
VITON (FPM)	-30°C to +230°C

Can this sanitary union check valve be used for home washing machines or RV black water tanks?

Absolutely Not (Strictly Industrial Grade)
This is a highly specialized, precision-forged SS316L sanitary valve designed exclusively for industrial food, beverage, and pharmaceutical manufacturing facilities. It is built to withstand high-pressure steam and aggressive CIP chemicals. Using a premium hygienic valve of this caliber for domestic washing machines or RV waste tanks (black water) is entirely inappropriate and a complete mismatch of engineering standards.

What are the advantages of a "Union" connection over a Tri-Clamp connection?

Vibration Resistance: A union connection utilizes a heavy-duty threaded metal nut to pull the two ferrule faces together over a gasket. This threaded design is often much more resistant to loosening from severe pump vibrations compared to a standard hinged Tri-Clamp.
European Standard Compatibility: Union nuts are the backbone of European hygienic piping standards like DIN 11851 and SMS. If your facility uses these standards, a union check valve is required to seamlessly integrate into your existing lines without needing adaptors.