NVS Brass Spring Check Valve

NVS - Yellow Spring Check Valve

The Yellow Spring Check Valve is a type of valve-type connecting element used in water plumbing and industrial applications, generally preventing backflow (non-return) or providing pressure control. It is especially preferred in pressure ratings such as PN10 and PN16 and is recognized by its yellow spring mechanism.

Features and Intended Use

1. Operating Principle:
• Thanks to its spring mechanism, it allows one-way passage of water or other media (prevents backflow).
• It closes automatically when pressure drops or flow stops, preventing leakage.
2. Material:
• Body: Brass, cast iron or stainless steel.
• Spring: Stainless steel (the yellow color may serve corrosion resistance or standard marking).
• Disc (Flap): With NBR, EPDM or Viton seal.
3. Areas of Use:
• Water plumbing (booster pump systems, mains lines).
• Industrial processes (chemical, food, HVAC systems).
• Irrigation systems (pressure regulation in drip lines).

Advantages

✔ Fast response – Closes instantly when flow stops.
✔ Gasket-free design – Long service life thanks to the spring and conical disc.
✔ Low pressure loss – Operates more efficiently than other check valves.

Installation and Points to Note

• It must be installed in the correct direction (the arrow on the body shows the flow direction).
• In high-pressure lines, an additional gasket or sealant may be required.
• Requires periodic inspection (spring elasticity and disc wear).

Standards and Alternatives

• Manufactured in accordance with standards such as DIN 3356, EN 12334.
• Similar products: Piston check valve, diaphragm check valve, spring-loaded check valve.