Nozzle Check Valves

As a natural evolution to the non-return valve range, Advance Valve introduced their NZ-Series of axially operated Nozzle Check non-return zero leak valves with non-slam characteristics for special applications.
The design incorporates the latest 3D designed tools and rigorous computational fluid dynamics analysis validated by experimental testing to ensure a well-matured, efficient, and reliable product range.
Our NZ-Series of nozzle check valve design provide streamlined and unrestricted flow through the valve ensuring comparatively higher flow rates and low-pressure drop across these axial flow check valves which inherently ensures low energy loss in the line thus improving the operational efficiency of any plant in operation. The design takes advantage of the teardrop-shaped special venturi design to improve the static as well as the dynamic performance of the valve. Due to the robust design of NZ- series valves which encompass features like low failure rate, practically zero maintenance requirements, zero seat leakage and improved performance characteristics, these zero leak valves can be effectively, efficiently, and safely used in critical process applications in particularly large size gas and liquid flow pipelines.

Key Features of Advance Valves’ Axial / Nozzle Check Valves

  • Designed as per ANSI B16.34.
  • Non slam axially operated.
  • Self-operated, no external force required.
  • High flow coefficient, low pressure drop.
  • Quick response to change in flow direction.
  • Metal seated, efficient tight shut-off sealing.
  • Double Flange Body design as standard, other end connections available.
  • Zero emission.
  • Maintenance-free.


Non-slam check valves are designed to prevent the reverse flow of fluids in a pipeline without creating the characteristic slamming noise and water hammer effect of traditional check valves. These valves are commonly used in applications where the sudden stopping of fluid flow can cause damage to the pipeline and its components.

Non slam check valves work by using a spring-loaded disc or piston to control the flow of fluid. When the fluid is flowing in the forward direction, the disc or piston is held open, allowing the fluid to pass through freely. However, when the fluid begins to flow in the reverse direction, the disc or piston quickly closes, preventing the flow of fluid and avoiding the slamming noise and water hammer effect.

Non-slam check valves are essential components in pipelines and other fluid handling systems to prevent backflow and ensure system efficiency. There are several manufacturers of non-slam check valves, but one reputable brand is Advance Valve.

Advance Valve is a leading manufacturer of industrial valves, including non slam check valves. Their valves are designed with advanced features to prevent water hammer and other issues associated with traditional check valves. They offer a range of sizes and materials to suit different applications.

A zero leakage valve is a type of valve designed to prevent any fluid or gas from leaking through the valve when it is in the closed position. This is achieved through the use of advanced sealing technologies and materials. Zero leakage valves are commonly used in applications where any leakage can cause safety hazards, environmental contamination, or loss of valuable resources. These valves are essential components in industries such as oil and gas, chemical processing, pharmaceuticals, and food and beverage. Investing in high-quality zero leak valves can result in significant cost savings, increased efficiency, and improved safety in industrial operations.

Valves are an essential component in the piping system, and ensuring that they work effectively is crucial for preventing leakage. There are various types of leakage that can occur in valves, and identifying them is vital in addressing the issue promptly.

Some of the common types of leakage in valves include internal leakage, external leakage, and stem leakage. Internal leakage happens when the valve fails to close correctly, allowing the fluid to seep through the valve. External leakage occurs when the fluid escapes from the valve and affects the surrounding environment, and stem leakage happens when the valve stem seal is not functioning correctly.