Q: What is the function of a double union check valve?

A double union check valve is designed to prevent fluid from flowing backward in a piping system. It allows unidirectional flow and automatically shuts when flow stops or reverses, protecting pumps and equipment from backflow damage.

Q: What are the advantages of using double union ends?

The double union design allows the main body of the valve to be easily unscrewed and removed from the pipeline without cutting or dismantling the surrounding pipes. This makes cleaning, maintenance, and replacement extremely fast and simple.

Q: Can this check valve be installed horizontally and vertically?

Yes, it can be installed in both positions. However, for vertical installations, you must ensure that the flow direction is upward so that gravity and backpressure can properly close the valve mechanism when flow ceases.

Q: How do I choose the correct material for my application?

Selection depends on the fluid chemical compatibility, pressure, and temperature. Thermoplastic options like PVC or CPVC with EPDM or FKM seals are highly recommended for water treatment and corrosive chemical applications.

Q: How can I ensure a leak-proof connection during installation?

Ensure that the internal O-rings are clean, properly lubricated if necessary, and correctly seated in their grooves. Hand-tighten the union nuts firmly, and if needed, use a strap wrench. Avoid over-tightening to prevent thread distortion or damage.