How does a nozzle check valve work?

When considering non-slam valves for severe and demanding applications, nozzle check valves should be your first port of call. The high-performance characteristics of this nozzle-type check valve assure optimal flow control in the toughest environments. In this article, MGA Controls explains how nozzle check valves work and the benefits they offer users.

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What is a nozzle check valve?

A type of non-slam check valve, nozzle check valves are high-performance and self-actuated regulating devices. These reliable non-return valves are designed specifically with demanding applications in mind. They react promptly to high deceleration rates with a non-slam performance, minimizing water hammer in reverse flow conditions.

Compared to other check valves, nozzle check valves offer unrivaled high flow, energy efficiency, and non-slam performance. They come with various valve body and internal orifice designs and springs optimized for specific flow conditions. Additionally, they feature a built-in diffuser, which recovers head losses and minimizes energy consumption.

Nozzle check valves also feature a spring-assisted, short-stroke disc action that closes the valve within mere fractions of a second. This function protects pipework, expensive pumping, and related equipment from high reverse velocities and damaging surge pressures.

Types of nozzle check valves

At MGA Controls, we provide nozzle check valves for every application. Tailored to suit the flow and dynamics of demanding environments, our nozzle check valves are optimized for factors such as:

• System deceleration rates
• Reverse flow velocities
• Critical flow velocities
• High flow rates
• Minimum head loss
• Maximum energy efficiencies
• Maximum longevity

Energy-efficient designs with unmatched longevity make nozzle check valves ideal for the Potable Water UK Water Industry, including buried service. The two main types of nozzle check valves we provide are the Z Type Solid Disc and the N Type Ring Disc, Metal to Metal seated, maintenance-free valves from Noreva GmbH.

Want more information on nozzle check valve manufacturers? Feel free to contact us.

Z Type solid disc nozzle check valves

Featuring a single, turbulent-free, aerodynamic flow path, Noreva’s Z Type Nozzle Check Valve is a high-performance, non-slam, high-flow, low head loss, solid disc non-return valve for sizes up to DN250. A single spring design with diffuser provides maximum pressure drop recovery, maximizing energy efficiencies. Minimizing turbulence, the diffuser also stabilizes disc performance. Multiple spring torque options are available to suit a variety of critical velocities. Even in partially open states, the Z Type check valve performs without ‘flutter’ and wear. This allows operation in low-flow conditions with a far-wider operating range and low whole-life costs.

N Type ring disc nozzle check valves

The N Type ring disc check valve from Noreva is designed with a low-weight ring disc mounted to a frictionless, maintenance-free, multi-spring radial guide assembly.

Featuring a twin, turbulent-free, aerodynamic flow path, Noreva’s N Type Nozzle Check Valve is a high-performance, non-slam, high-flow, low head loss, ring disc non-return valve for sizes DN300 up to DN2200. The multiple spring design and radial guide assembly with diffuser is exceptionally responsive and provides maximum pressure drop recovery, maximizing energy efficiencies. Minimizing turbulence, the diffuser also stabilizes disc performance. Multiple spring torque options are available to suit a variety of critical velocities. Even in partially open states, the N Type check valve performs without ‘flutter’ and wear. This allows operation in low-flow conditions with a broader operating range and low whole-life costs.

Nozzle check valve manufacturers

All of our nozzle check valves are manufactured by industry leaders Noreva GmbH. A proud partner since 2015, MGA Controls is the exclusive supplier of their non-slam non-return check valves to the UK’s water industry. Operating under an ISO 9001:2015 quality management system, all nozzle check valves we supply are unparalleled in quality, performance, and longevity.

To purchase a nozzle check valve or learn more about the complete range of nozzle check valves available at MGA Controls, get in touch today on 01704 779324 or email us at sales@mgacontrols.co.uk.