NVS Vertical Silent Check Valve

NVS Vertical Check Valve (Silent Check Valve)

A plumbing component that allows the medium passing through it to flow in one direction only.

It automatically shuts off reverse flow, stopping unwanted backflow.
A vertical check valve is a type of valve that allows liquid or gas to flow in one direction only and automatically prevents backflow. It is also called a silent check valve because it produces less noise and vibration than other check valves.A vertical check valve is a backflow prevention valve that prevents water from flowing back in water installations and is specially designed for use in vertical pipelines. It is also known as a silent check valve because it produces less noise than conventional check valves.

Features and Operating Principle

• One-Way Flow: Allows water to pass in one direction only (top to bottom / bottom to top) and automatically prevents reverse flow.
• Vertical Installation: Thanks to its special design, it works efficiently in vertical pipelines (e.g. high-rise water risers in buildings).
• Silent Operation: Its internal mechanism (spring-loaded or weighted disc) minimizes water hammer and check valve slamming noise.
• Material: Brass, cast iron or stainless steel (depending on pressure and water quality).

Areas of Use

1. Building Water Installations:
• At water tank outlets and in booster pump systems.
2. Hot Water Systems:
• In combi boiler / apartment heating supply lines.
3. Industrial Applications:
• At pump outlets and in fire protection installations.

Installation Rules

1. Direction Matters!
• The arrow on the valve shows the direction of water flow. Observe this direction during installation.
2. Vertical Position:
• Used only in vertical pipelines (efficiency drops if installed horizontally).
3. Gasket/PTFE Tape:
• Always apply to threaded connections for a tight seal.

Advantages

✔ Longer service life than conventional check valves.
✔ Reduces water hammer (silent operation).
✔ Withstands high pressure (models rated 16 bar and above are available).

Example Applications

• "We prevented backflow by fitting a vertical check valve to the water riser of a 5-story building."
• "We prevented pump damage by installing a silent check valve at the booster pump outlet."

⚠ Points to Note:

• Check the mechanism periodically (limescale can cause sticking).
• Be careful when selecting the pump, as the valve can cause pressure loss.

Standards and Technical Details

• Working Pressure: 10-25 bar
• Temperature Resistance: -10°C to +110°C (depending on material)
• Connection Type: Standard threaded models such as 3/4", 1", 1¼", or flanged models.

Note: Vertical check valves should conform to the TS EN 13959 standard.

Silent Check Valve vs Conventional Check Valve