Nozzle Check Valves    - Recommended by www.ValveDepot.com   

 

Products

For more than 70 years Entech has been producing nozzle check valves which have been in operation very successfully world-wide and are used for all kinds of fluids and gases. The pressure loss of these technically high-standard valves is very low and they are produced in the range of 25 mm (1 in) up to 2200 mm (88 in) up to a pressure class of 1000 bars.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type DRV - Z 
Nozzle Check Valve

 

 

 

Check valves are used in numerous installations for various purposes and it is always a problem for the planning engineer to find suitable return flow preventers. Often it does not become evident until a plant is being run on test that the selected non return-valves slam heavily and produce high pressure peaks which exceed the permissible pressure to such an extent that the installation and the surroundings are endangered.

 

 

 

 

 

A further important factor in the present and future is economy (the savings of energy). A feature of the nozzle check valve DRV-Z is its inherent non ?slam characteristic. This is attained because the valve reacts so quickly to flow (velocity) changes that it is always able to outpace the process change and be at the point of closure before it is possible to obtain reverse flow.

 

 

 

 

 

In liquids this avoids 攚ater hammer? and in gas it assures no chance of reverse flow into the compressor. Additional benefit of the nozzle check valve design is its extremly long service life because the moving parts are not subjected to the shocks associated with typical asymmetric valve designs. The valve has no soft parts to wear, cause misalignment, or need replacing.

 

 

 

 

The type DRV-Z can be installed in Water, Oil and LNG pump stations as well as in compressor stations.

 

 

 

 

 

 

 

 

 

 

 

 All Entech Meer designs are available in virtually any commercially available material suitable for casting and built and tested to widely accepted standards such as API 6D or DIN etc. ?br>Valves to other standards, testing qualification procedures are available to meet any requirement.

 

 

 

 

 

 

Features

 

 

 
  • Non-slam design
  • Low pressure loss
  • Maintenance free over a long period

 

 

 

The Entech Meer nozzle check valve type DRV-Z was designed to provide the three mandatory requirements of a check valve: non-slam, low pressure loss and no maintenance. In any system when the pump or compressor is energized the system fluid acts on the upstream side of the valve moving the disc off the seat.

 

 

 

The fluid will increase in velocity as it approaches the throat of the valve, then using the Venturi effect of the precisely prefiled surfaces of body and diffuser, high pressure recovery is achieved. As the fluid exits the valve its velocity and pressure is almost identical to its incoming conditions. As the flow velocity decreases the carefully selected helical spring acts on the disc moving it towards the closed position, due to the reduced opening force of the process fluid. With proper attention to the flow parameters the valve can achieve movement from fully open to fully closed in less than 0.1 seconds.

 

 

 

This performance allows the disc to be in the optimum position at all times: fully open at normal flow, proportionally more closed as the flow reduces and fully closed if there is any system attempt at flow reversal. This proportional movement ensures non-slam closure. The flow diffuser is manufactured separately from the body allowing accurate machining of all critical areas and optimum material selection. The metal-to-metal sealing achieves tight shut-off with 100% reliability and no weak link or soft seals to cause premature valve failure. The nozzle check valve is suitable for installation in any position (horizontal, vertical or inclined).

 

 

Type KRV
Wafer Check Valve

 

 

 

The type KRV is a development in our program of check valves which combines the functional principle of a fast closing check valve with a very short  face ?to ?face dimension for installation between two flanges. This valve is recommended as a non ?return element, for example where limited installation space is available. The short stroke of the disc guarantees the advantage of slam ?free closure.

 

 

 

 

 

 

An additional benefit of the KRV valve design is its extremly long service life as the moving parts are not subjected to the shocks associated with typical asymmetric valve designs.

 

 

 

 

The valve has no soft parts to wear, cause misalignment or need replacing. All Entech Meer designs are available in virtually any commercially available material suitable for casting and built and tested to widely accepted standards such as API 6D or DIN etc. ?/font>

 

 

 

 

Valves to other standards and testing qualification procedures are available to meet any requirement.

 

 

Features

 

 
  • Non-slam design
  • Short installation length
  • Maintenance free over a long period

 

 

 

 

 

 

 

The Entech Meer wafer check valve type KRV was designed to meet three mandatory requirements : non ?slam, short installation length and no maintenance. This very space ?efficient non ?return valve is a compact, fully non ?slam valve and available for sizes from 1?up to 12?and all pressure classes. This superbly simple design allows the single axial disc to respond very quickly to any flow changes. This rapid response to process changes ensures the disc is correctly positioned at all times and is fundamental in achieving fully non ?slam closure. With proper attention to the flow parameters, the valve can achieve movement from fully open to fully closed in less than 0.1 seconds.

 

 

 

 

 

 

 

 

 

 

 

 

The reduced length available within the valve for optimum pressure recovery is offset by the other installation advantages of the KRV design. The metal ?to ?metal sealing achieves tight shut ?off with 100% reliability and no weak link or soft seals to cause premature valve failure. The KRV check valve is suitable for installation in any position ( horizontal, vertical or inclined ).

 

 

 

Type DRV-B
Nozzle Check Valve

 

 

 

The type DRV-B has been developed especially for large sizes. The valve disc ring moves frictionless by a combination of springs and guide. The moving masses are extremely small. The incoming fluid diverges at the ring into two annular nozzle-shaped ports. This concept, combined with the aerodynamic diffuser design, guarantees a low pressure loss. Another feature of the nozzle check valve is its inherent non-slam characteristic.

 

 

 

 

 

 

  This is attained because the valve reacts so quickly to flow (velocity) changes that it is always able to outpace the process change and to be at the point of closure before reserve flow can occur.

 

 

 

 

 

In liquids this avoids water hammer and in gas it assures no chance of reverse flow. Many hydraulic studies have been performed on the DRV-B and the results are available on request.

 

 

An additional benefit of the nozzle check valve design is its extremely long service life as the moving parts are not subjected to the shocks associated with typical asymmetric valve designs. The valve has no soft parts to wear, cause misalignment, or need replacing. All Entech Meer designs are available in virtually any

 

commercially available material suitable for casting and built and tested to widely accepted standards such as API 6D or DIN etc. ?/font>

 

 

Valves to other standards and testing qualification procedures are available to meet any requirement.

 

 

Features

 

 

 
  • Non-slam design
  • Low pressure loss
  • Maintenance free over a long period

 

 

The Entech Meer nozzle check valve type DRV-B was designed to meet the three mandatory requirements of a check valve: non-slam, low pressure loss and no maintenance.

 

 

 

 

This one-piece body design is recommended for large sizes and high pressure classes. The unique annular ring design outperforms other nozzle designs, particularly in larger valves, because the moving component (disc) has a very low mass and can move from fully open to fully closed very quickly by a friction free action not attainable by centre shaft designs. In the fully open position, the disc and the diffuser form a perfect aerofoil section allowing excellent pressure recovery.

 

 

 

 

 

 

The uniform shape of the flow path through the entire valve ensures excellent stability for the moving disc which shadows any change in process flow rate, so being correctly positioned at all times. This ability to move in line with flow change is fundamental to achieving fully non-slam closure.With proper attention to the flow parameters, the valve can achieve movement from fully open to fully closed in less than 0.15 seconds.

 

The metal-to-metal sealing achieves tight shut-off with 100% reliability and no weak link or soft seals to cause premature valve failure. The nozzle check valve is suitable for installation in any position (horizontal, vertical or inclined).

 

Type KRV-B
High Dynamic Check Valve

 

 

 

End user and operators now demand fully non-slam performance from more compact check valves, particularly in weight and space-sensitive locations.
The KRV-B high dynamic check valve has been developed specifically to meet these customer requirements, based on more than 70 years experience of assisting industry to solve process problems. Modern computer simulations, coupled with hydraulic studies, have resulted in this type of check valve.

 

 

 

 

 

 

The KRV-B provides:
Extremely compact design for very short installation length.
- A disc principle in order to keep the weight of the moving part low.
- Short stroke.
- A pressure loss within acceptable limits, despite the short installation length and short stroke.

The dynamic behaviour of this type of check valve has been tested by independent hydraulic institutes. Test reports are available on request.

 

 

An additional benefit of this check valve design is its long service life as the moving parts are not subjected to the shocks associated with typical asymmetric valve designs and thanks to the smooth closing effect.

 

 

 

 

 

 

Case histories are available where the KRV-B has been installed in piping systems worldwide. All Entech Meer designs are available in virtually any commercially available material suitable for casting and  built and  tested to widely accepted standards such as API 6D or DIN etc. ?

 

 

 

 

 

Valves to other standards and testing qualification procedures are available to meet any requirement.

 

 

 

Features

 

 

 

 

 
  • Non-slam design
  • Very fast closure
  • Short installation length

 

 

The Entech Meer high dynamic check valve
type KRV-B was designed to meet three mandatory requirements: non-slam, very fast closure and short installation length. This very space-efficient non-return valve is currently the world憇 most compact, fully non-slam valve available for sizes from 10?up to 72?and all pressure classes.

 

 

 

 

 The optimum dynamic design of the valve internal parts allows the disc to respond very quickly to any flow changes. This rapid response to process changes ensures that the disc is correctly positioned at all times and is fundamental to achieving fully non-slam closure. With proper attention to the flow parameters, the valve can achieve movement from fully open to fully closed in less than 0.15 seconds.

 

 

 

The reduced length available within the valve for optimum pressure recovery is offset by the other installation advantages of the KRV-B design. The single helical spring is fully shielded from the process stream by the central flow diffuser.The metal-to-metal sealing achieves tight shut-off with 100% reliability and no weak link or soft seals to cause premature valve failure. The KRV-B check valve is suitable for installation in any position (horizontal, vertical or inclined).

 

Type DRVg
Nozzle Check Valve

 

 

 

The type DRVg has been developed especially for large sizes. The valve disc ring moves frictionless by a combination of springs and guide. The moving masses are extremely small. The inflowing fluid diverges at the ring into two annular nozzle-shaped ports. This concept, combined with the aerodynamic flow pattern design, guarantees a very low pressure loss. Another feature of the nozzle check valve is its inherent non - slam characteristic.

 

 

 

 

 

 

This is attained because the valve reacts so quickly to flow (velocity) changes that it is always able to outpace the process change and to be at the point of closure before reserve flow can occur.In liquids this avoids water hammer and in gas it assures no chance of reverse flow.

 

 

 

 

Many hydraulic studies have been performed on the DRVg and the results are available on request. Additional benefit of the nozzle check valve design is its extremely long service life as the moving parts are not subjected to the shocks associated with typical asymmetric valve designs.

 

The valve has no soft parts to wear, cause misalignment, or need replacing. All Entech Meer designs are available in virtually any commercially available material suitable for casting and built and tested to widely accepted standards such as API 6D or DIN etc. ...

 

 

 

 

Valves to other standards and testing qualification procedures are available to meet any requirement.

 

 

Features

 

 

 
  • Non-slam design
  • Low pressure loss
  • Maintenance free over a long period

 

 

The Entech Meer nozzle check valve type DRVg was designed to meet the three mandatory requirements of a check valve: non-slam, low pressure loss and no maintenance.

 

 

 

 

This unique annular ring design outperforms other nozzle designs, particulary in larger valves, because the moving component (disc) has a very low mass and can move from fully open to fully closed very quickly by a friction-free action not attainable by centre shaft designs. In the fully open position, the disc and the diffuser form a perfect aerofoil section. This, combined with the increased nominal bore due to the oversize centre flange, achieves optimum pressure recovery. The uniform shape of the flow path through the entire valve ensures excellent stability for the moving disc which shadows any change in process flow rate, so being correctly positioned at all times.

 

 

 

This ability to move in line with flow change is fundamental to achieving fully non-slam closure. With proper attention to the flow parameters, the valve can achieve movement from fully open to fully closed in less than 0.15 seconds.The metal-to-metal sealing achieves tight shut-off with 100% reliability and no weak link or soft seals to cause premature valve failure. The nozzle check valve is suitable for installation in any position (horizontal, vertical or inclined).

…… and more


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