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. As such, this means they can react promptly to high deceleration rates with a non-slam performance, which minimises water hammer in reverse flow conditions.

Compared to other check valve types, nozzle check valves offer unrivalled high flow, energy efficiencies and non-slam performance. They come with a selection of valve body and internal orifice designs and springs that are specifically optimised for the flow conditions of any given application. In addition, they also feature a built-in diffuser, which recovers head losses unlike any other non-return valve and minimises 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 is able to protect pipework, expensive pumping and related equipment from any high reverse velocities and damaging surge pressures.

Structure of a Non Slam Nozzle Check Valve

The axial flow check valve has a simple structure and is mainly composed of a valve body, seat, disc, spring, guide sleeve, guide cover, and internal structure. See as bellow picture.

Design Features of Nozzle Type Check Valves

The nozzle check valves characterise for an effective dynamic response under various flow deceleration conditions.

Generally compared to other traditional check valves, the valve design is superior in performance, lower pressure drop ( depending size and form) and response.

The axial movement of the disc is giving a streamlined flow path obtaining the Venture effect.

Generally spoken the axial graded nozzle formed check valves have presently a much better dynamic performance compared to other conventional.

Its application on high pressure pumping equipment is not only allowing a better dynamic performance but also a more durable design compared well other conventional check valves.

As the flow is streaming smoothly through the valves it is not exposed to continuous movements.

How does a Nozzle Check Valve work?

The opening and closing of the flap for axial flow check valve is determined by the pressure difference between the inlet end and the outlet end of the valve. When the pressure at the inlet end is greater than the sum of the spring forces at the outlet end, the valve flap is opened; when the sum of the outlet end pressure and the spring force is greater than the inlet end pressure difference, the flap is closed. The structures in valve opening and closing.

Technical Data of Nozzle Check Valves

• RANGE: DN 100 to DN 900
• Design: EN16767(EN12516-1) / API594 (ASME B16.34)
• Connections: Flanged PN10 to PN100 ACC. to EN1092-1 / ISO7005-1 / BS 4504 sect. 3.2 ANSI125#/600# ACC. to ASME B16.1/B16.5.
• Face to Face: API594 (300#-600#) others no standard.
• Operating temperatures: -20ºC +200ºC (rubber seated) others inquire.
• Testing: EN12266 (ISO5208) / API598. Minimum pressure for tightness: 0.2 bar.
• Materials: Ductile Iron, Steel, Stainless steel, superduplex, brz -alu.

Features of Axial Nozzle Check Valves

Nozzle check valves have been designed to provide reliable backflow prevention for the Petrochemical, Gas & Water divisions.

ZECO’s Engineering department has create Nozzle check valve with dymanic quick closing which reduces the flow return speed. The Axial movement of the disc produces a streamlineflow with venturi effect which reduces the pressure drop with minimal seat leakage and with minimum turbulences.

Our design needs only a very low flow to completely open the valve and guarantees the highest fluid dynamic performances reacting fast to flow alteration.

Nozzle check valves are available with multiple spring torques increasing considerably its purposes. it has also been conceived to have really low maintenance costs and high serviceability.

Advantages of Nozzle Check Valves

• Low pressure loss
• Unique dual-spring design for fast, dynamic, non-slam response
• Reliable, maintenance-free operation
• One-piece, all-metal valve body—fire safe and no fugitive emissions
• Reliable, leak-free, and integral metal-tometal seat
• Suitable for low and high flow rates
• Springs replaceable without major valve disassembly
• Lightweight moving parts and minimized disc stroke to optimize the closing time
• Low friction bearings

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What is a Axial Flow Check Valve?

Axial Flow Check Valve is a high-performance check valve designed in accordance with API 6D and ASME B16.34 . It is widely used in pipeline systems to prevent liquid backflow hazards and protect mechanical equipment. It also has the superior characteristics of reducing the harm of water hammer, reducing noise, reducing pressure drop and quick response. Depending on the operating temperature and pressure difference, Zeco can provide corresponding solutions and professional technical services.

Axial Flow Check Valve works:

The pressure difference between the inlet and outlet of the valve determines the opening and closing of the valve disc. When the sum of the pressure at the inlet end and the pressure at the outlet end unfolds the spring force, the valve flap opens.

As long as there is a pressure difference, the valve flap is always open, but the degree of opening is determined by the size of the pressure difference. When the sum of the pressure at the outlet end and the spring force is greater than the pressure difference at the inlet end, the valve flap is closed and is always closed.

Since the opening and closing of the valve flap is in a dynamic force balancing system, the valve operates in a balanced manner, without noise, and the water hammer phenomenon is greatly reduced. If the fluid flow pressure cannot support the valve in a large opening and maintain a stable open position, the valve flap and related moving parts may be in a state of continuous vibration.

In order to avoid premature wear of moving parts, noise or vibration or vibration operation, it is necessary to select the size of the check valve according to the fluid state.

It can be required to support the check valve in an open, stable ON state most early fluid velocity is known as the most small flow rate. If the nominal flow rate through the check valve to meet or exceed the installation of check valves, internal wear is reduced most small, it is possible to prevent catastrophic failures.

It can be seen from the above that having a smaller V can greatly reduce the maintenance cost and increase the reliability of the check valve. (Axial flow check valve) Compared with swing-open and oblique check valve, it has a lower V value. When the valve is opened, the force acting on the valve can be tested, and it can be easily seen.

With the increase of the opening angle, the oblique valve disc check valve reduces the force on the valve disc. This is because when the opening angle increases, the area of ​​the valve disc’s force decreases. When the fully open position is reached, only the force component of the total fluid flow pressure is supporting the valve flap in the fully open position. This problem does not exist with axial flow check valves.

In (axial flow check valve), the pressure difference is the main factor to keep the valve closed, while the spring only adds a small recoil force. This feature makes the spring’s spring force very small, and the response of the spring is very sensitive. The valve disc can give the valve disc the force when the fluid starts to flow backward, so that the valve disc responds quickly to the seat, ensuring a long service life of the valve. Not to be damaged.

When the fluid through the valve, the check valve by axial geometry sleek streamlined design, the pressure loss can be reduced most small and reduce the stroke. While maintaining the same CV value.

(Axial flow check valve) The disc has a small mass, which reduces the friction on the guide surface, and the disc can be seated quickly. The small mass and low inertia disc travels through a short stroke and contacts the valve seat surface with minimal impact. This can prevent the sealing surface of the valve seat from being damaged and prevent the valve seat from leaking.

Design features Product range:

Venturi-type channel, reduced pressure drop spring protection, no collision low noise, soft seal with little water hammer hazard , secondary seal hard seal, full range of fire protection design provides lifting ear and foot valve without medium leakage.

• Type : Gate valve, globe valve, check valve
• Size : 2 ~ 60 ” ( DN50 ~ DN1500 )
• Pressure rating : 150 ~ 2500LB ( PN16 ~ PN420 )
• Body material : Cast carbon steel, stainless steel, alloy steel
• Connection form : RF , RTJ , BW

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What is an Axial Check Valve?

The main purpose of an axial flow check valve is to allow flow in one direction while prohibiting or stopping flow in the opposite direction. It is normally stationary in the closed position. The performance of axial check valves in terms of low pressure loss, stable operation, and dynamic behavior play a vital role in critical check applications such as the protection of rotating equipment and systems.

Why are Axial Check Valves used and play a vital role?

When the flow in a pipeline is reversed, this can cause a hydraulic shock wave to pass through (also known as a water hammer). This can cause serious damage to equipment in the pipeline if nothing is done to prevent it. Introducing the correct check valve, in the fully closed position in the event of a reversal of flow, can prevent this from happening and causing serious problems in the field.

A valve that prevents water hammer and rapid closure without a banging sound is known as an axial flow check valve.

How are Axial Flow Check Valves used?

The axial check valve is specifically designed for fast backflow systems, where backflow is a constant problem. It is classified as a non-slam check valve as there is no slamming when the valve closes, meaning that no excess pressure spikes are generated. Most axial flow check valves are spring loaded and have a low mass disc, which facilitates a rapid dynamic response to a reduction in flow. As there is a single disc and spring, the forces are balanced when the disc is open, resulting in a uniform flow.

Working principle of Axial Flow Check Valves

When the pressure difference between the upstream and downstream of the valve exceeds the rupture pressure of the spring, the disc will move and allow flow. The flow area of the valve steadily decreases to the seat diameter; this is the venturi design.

As a result of the venturi design, the reduced flow area increases the dynamic pressure and reduces the static pressure, allowing the valve to open fully and quickly. The spring is chosen to allow the disc to open fully and stabilize on its backstop under normal flow conditions.

When the flow rate is significantly reduced, the spring responds to the reduced flow rate in advance.

Advantages of Axial Check Valves

1. Axial flow

The streamlined flow path through the full port expanded body prevents turbulence, erosion, and vibration, which eliminates the process downtime and maintenance cost.

2. Low pressure loss

The full port passage and high-pressure recovery of the venturi-shaped body lead to lower pressure loss. This saves the cost of pumps.

3. Tight shut-off

Tight shut-off is achieved by a metal-to-metal seal between the disc and the valve seat. This seal is unaffected by material erosion and deformation (e.g. soft seal).

4. Easy opening and stable operation

The low static pressure in the throat area of the venturi shape creates a pressure differential across the disc, resulting in the easy opening. Axial check valves respond smoothly to changes in flow and remain stable when they should.

5. Non-slamming operation

The spring-assisted design ensures ultra-fast closing, with virtually no backflow or pressure surges in critical applications such as multi-pump systems or LNG trains.

6. Maintenance-free

The internal construction is based on the application of sound basic mechanical engineering principles. As a result, ZECO axial check valves do not require any maintenance.

Difference between Swing Check Valves and Axial Check Valves

Swing check valve

A fairly basic type of valve, swing check valves are butterfly shaped, meaning that the disc – the part that stops the flow of fluid – opens and closes on a hinge or trunnion. Although these valves are ideal in some applications, swing check valves are being phased out due to commonly recurring problems such as turbulence and water hammer.

Axial check valve

The axial flow check valve is an updated design of the swing check valve. The disc in the valve is held in place by a spring. This centers the movement of the disc, allowing smoother fluid flow and reactive opening and closing without the sudden movements that cause the water hammer.

If any inquiries, you can contact ZECO Valve. Email: commercial@zecovalve.com

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