scholarly journals IMPROVED VALVE DESIGN SUSTAINABILITY RESEARCH

2021 ◽  
Vol 08 (04) ◽  
pp. 41-45
Author(s):  
Jamaladdin Aslanov Jamaladdin Aslanov ◽  
Niyaz Zeynalov Niyaz Zeynalov
Keyword(s):  
Abrasion Resistance ◽  
Check Valve ◽  
Relative Pressure ◽  
Valve Design ◽  
Analytical Expression ◽  
Sustainability Research ◽  
Pressure Seal

The issues of tightness and abrasion resistance of the new design of the ZMS-type valve are considered. An analytical expression was obtained to determine the relative pressure generated across the check valve of the improved valve. Checked the condition of the valve tightness and abrasion resistance. The new valve design was tested at JSCO “NEFTGAZMASH”, and as a result of the tests it was found that the new valve fully complies with these conditions. Keywords: leakage, relative pressure, seal, improved, ZMS, abrasion resistance.

scholarly journals Study of the nozzle check valve with respect to its operating characteristics

2018 ◽  
Vol 180 ◽  
pp. 02044 ◽  
Author(s):  
Roman Klas ◽  
Vladimír Habán ◽  
Pavel Rudolf
Keyword(s):  
Cfd Simulation ◽  
Check Valve ◽  
Operating Characteristics ◽  
Valve Design ◽  
Pressure Fields ◽  
Valve Disc ◽  
Unsteady Operation ◽  
Simulation Results ◽  
2D And 3D ◽  
Main Operating

Several modifications were developed when designing the nozzle valve. This study offers an assessment of the properties of new modifications of the nozzle valve design. The main operating characteristics, such as loss and flow coefficients, were determined using a CFD methods. Besides mentioned coefficients, the forces acting on the valve disc are also decisive for the behavior of the valve, both in its steady and unsteady operation. It is important to examine the possible simplification and matching of CFD simulation results from 2D and 3D geometries in terms of subsequent dynamic analysis of the valve. This will be taken into consideration by comparing the above-mentioned operating characteristics, by analyzing the forces acting on the valve disc and comparing the velocity and pressure fields.

scholarly journals Disposable miniature check valve design suitable for scalable manufacturing

2013 ◽  
Vol 203 ◽  
pp. 76-81 ◽  
Author(s):  
Anna I. Hickerson ◽  
Hsiang-Wei Lu ◽  
Kristina Roskos ◽  
Thomas Carey ◽  
Angelika Niemz
Keyword(s):  
Check Valve ◽  
Valve Design

Development of Enertech’s Advanced Normally Open NozzleCheck Valves for Generation III+ Nuclear Power Plants

2014 ◽  
Author(s):  
Haykaz Mkrtchyan
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Reverse Flow ◽  
Flow Direction ◽  
Fluid Dynamic ◽  
High Capacity ◽  
Check Valve ◽  
Operating Conditions ◽  
Flow Conditions ◽  
Valve Design

Enertech introduced the first Normally Open NozzleCheck valves to the nuclear power industry nearly 20 years ago. This passive valve design was developed to address reoccurring maintenance and reliability issues often experienced by various check valve types due to low or turbulent flow conditions. Specifically, premature wear on the hinge pins, bushings and severe seat impact damage had been discovered in several applications while the systems were in steady state operating conditions. Over the last two decades, Enertech has continued to improve upon the design of the valve, with the culmination coming most recently in support of Generation III+ passive reactor requirements. This entirely new valve is designed with minimal stroke, ensuring quick closure under low reverse flow conditions which no other check valve design could support. Additionally, features such as first in kind test ports, visual inspection points, and the ability to manually stroke the valve in line have resolved many of the short comings of previous inline welded flow check valves. Most importantly, advanced test based methodologies and models developed by Enertech, allow for accurate prediction of NozzleCheck valve performance. This paper presents the development of Enertech’s advanced Normally Open NozzleCheck Valve for Generation III and III+ nuclear reactor designs. The Valve performance was initially determined by using verified and validated computational fluid dynamic (CFD) methods. The results obtained from the CFD model were then compared to the data gathered from a prototype valve that was built and tested to confirm the performance predictions. Enertech has fully tested and qualified the Normally Open NozzleCheck valve which is specifically designed for applications that require a high capacity in the forward flow direction and a quick closure during low reverse flow condition with short stroke to minimize the hydraulic impact on the system.

Robust Mechanical Design Using Engineering Models

1995 ◽  
Vol 117 (B) ◽  
pp. 48-54 ◽  
Author(s):  
A. Parkinson
Keyword(s):  
Robust Design ◽  
Design Problem ◽  
Mechanical Design ◽  
Check Valve ◽  
Valve Design ◽  
Robust Designs ◽  
Linkage Design ◽  
Engineering Models ◽  
Transmitted Variation

This paper examines how engineering models can be used to develop robust designs—designs that can tolerate variation. Variation is defined in terms of tolerances which bracket the expected deviation of model variables and/or parameters. Several methods for robust design are discussed. The method of transmitted variation is explained in detail and illustrated on a linkage design problem and a check valve design problem.

Check Valve Flow and Disk Lift Simulation Using CFD

2017 ◽  
Author(s):  
Ronald Farrell ◽  
L. Ike Ezekoye ◽  
Mark Rain
Keyword(s):  
Flow Analysis ◽  
Flow Characteristics ◽  
Check Valve ◽  
Valve Lift ◽  
Valve Design ◽  
Valve Development ◽  
Wide Range ◽  
Computational Fluid Dynamics Cfd ◽  
Opening And Closing ◽  
Good Agreement

Computational Fluid Dynamics (CFD) is increasingly being used as a reliable method for determining flow characteristics of a wide range of flow situations. This paper presents an investigation on the application of CFD to characterize the opening and closing of check valves. Specifically, using CFD results, a procedure was developed to determine valve flow coefficients (CV) as a function of disk lift positions as well as to determine the flow rate required to achieve full open or predict intermediate disk lift positions. The method could be used for a wide range of check valves such as swing check valves, lift check valves, tilting disk check valves, or inline check valves. Using CFX which is a part of the ANSYS suite of finite element programs, examples of the predictive nature of CFD to characterize check valve performance are presented to address swing check and lift check valve designs. It is shown that balancing flow-induced forces on the disk and considering the disk assembly weight in the process is sufficient to model the valve lift behavior. Analysis results from this approach were compared with available test data of the modeled valves. The comparison showed good agreement, thus validating that both flow coefficients (CV) and flow rates across the valves at different disk lift positions can be reasonably predicted with this approach. The results of this study suggest that this approach can be used for valve design optimization and flow analysis of check valves. However, it should be pointed out that CFD is an evolving technology and is not a substitute for testing. The use of this tool compliments testing and, if carefully managed, can save valve development cost.

Curtiss-Wright Advanced NozzleCheck Valves for Generation III+ Nuclear Power Plants

2017 ◽  
Author(s):  
Haykaz Mkrtchyan ◽  
Ararat Torosyan ◽  
Tsolag Apelian
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Reverse Flow ◽  
Flow Direction ◽  
Fluid Dynamic ◽  
Check Valve ◽  
Operating Conditions ◽  
Low Flow ◽  
Flow Conditions ◽  
Valve Design

Curtiss Wright introduced the first Normally Open NozzleCheck valves to the nuclear power industry nearly 20 years ago. This passive valve design was developed to address reoccurring maintenance and reliability issues often experienced by various check valve types due to low flow conditions. Specifically, premature wear on the hinge pins, bushings and severe seat impact damage had been discovered in several applications while the systems were in steady state operating conditions. Over the last two decades, Curtiss Wright has continued to improve upon the design of the valve, with the latest generation coming most recently in support of the Westinghouse AP1000 design and similar Generation III+ passive reactor requirements. This entirely new valve is designed with minimal stroke, ensuring quick closure under specified reverse flow conditions which no other check valve design could support. Additionally, features such as first in kind test ports, visual inspection points, and the ability to stroke the valve manually or with system fluid in line have resolved many of the shortcomings of previous inline welded flow check valves. Most importantly, advanced test based methodologies and models developed by Curtiss Wright, allow for accurate prediction of NozzleCheck valve performance. This paper presents the development of Curtiss Wright’s advanced Normally Open NozzleCheck Valve for Generation III and III+ nuclear reactor designs. The Valve performance was initially determined by using verified and validated computational fluid dynamic (CFD) methods. The results obtained from the CFD model were then compared to the data gathered from a prototype valve that was built and tested to confirm the performance predictions. Curtiss Wright has fully tested and qualified the Normally Open NozzleCheck valve, which is specifically designed for applications that require a high capacity in the forward flow direction and a closure at low flow rates with short stroke to minimize the hydraulic impact on the system. Paper published with permission.

Robust Mechanical Design Using Engineering Models

1995 ◽  
Vol 117 (B) ◽  
pp. 48-54 ◽  
Author(s):  
A. Parkinson
Keyword(s):  
Robust Design ◽  
Design Problem ◽  
Mechanical Design ◽  
Check Valve ◽  
Valve Design ◽  
Robust Designs ◽  
Linkage Design ◽  
Engineering Models ◽  
Transmitted Variation

This paper examines how engineering models can be used to develop robust designs—designs that can tolerate variation. Variation is defined in terms of tolerances which bracket the expected deviation of model variables and/or parameters. Several methods for robust design are discussed. The method of transmitted variation is explained in detail and illustrated on a linkage design problem and a check valve design problem.

The Effect of Different Monolithically Integrated Check Valve Designs on the Efficiency of Disposable PZT-PDMS-Micropumps

2010 ◽  
Author(s):  
Stefanie Demming ◽  
Ahmed Fadl ◽  
Mareike Schleßmann ◽  
Bjo¨rn Hoxhold ◽  
Zongqin Zhang ◽  
...  
Keyword(s):  
Check Valve ◽  
Working Fluid ◽  
Fabrication Technology ◽  
Apparent Effect ◽  
Valve Design ◽  
Fully Integrated ◽  
Operational Conditions ◽  
Monolithically Integrated ◽  
Offset Voltage ◽  
First Results

In the presented study, check valve micropumps with three different valve designs have been developed, fabricated, and successfully tested. These check valves — in the form of differently shaped flaps — were integrated monolithically within the microchannel inlet and outlet of the pump chamber which allows for rapid and inexpensive fabrication of the device. The pump is made of Polydimethylsiloxane (PDMS) with a fully integrated circular piezo-electric transducer (PZT) as a micropump actuator. The performance of the micropumps was characterized under different actuator frequencies, depending on the excitation signal (square, sinusoidal or saw tooth), the implemented PZT diameter (10 mm or 15 mm), as well as the applied offset voltage (positive or negative). Ethanol was used as the working fluid in all experiments. The fabrication technology of the monolithically designed micropump is described, and the results are presented in terms of flow rates. The presented work suggests that the check valve design has an apparent effect on the micropump performance under different operational conditions. All in all, the first results show promising characteristics for easy and inexpensive integration of the proposed micropump in disposable lab-on-a-chip systems.

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