Modeling Pop Action Pressure Relief Valve as a Bistable Element

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Lili Xie ◽  
Xinhua Zheng ◽  
Lizhuo Liu
Keyword(s):  
Traditional Method ◽  
Modeling Method ◽  
Experimental Results ◽  
New Method ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Simulation Data ◽  
Pressure Relief ◽  
Pressure Relief Valves

To overcome the shortcomings of traditional method for modeling pop action pressure relief valves (PAPRVs), a new method for modeling PAPRVs as a bistable element is proposed. The effects of the model’s main parameters on a valve’s behavior are simulated and analyzed. Through simulations, the atypical behaviors of PAPRV previously found by other researchers do arise and can be explained based on the simulation data. Then, according to this new method, a model was built for a special pressure relief valve, and the simulation data agree well with the experimental results. These results demonstrate the validity of the modeling method.

Theoretical and Experimental Investigation of a Pressure-Relief Valve for Variable Compression Ratio Pistons

1989 ◽  
Vol 203 (2) ◽  
pp. 99-109 ◽  
Author(s):  
N Ladommatos ◽  
J R Barber ◽  
I A C Brown
Keyword(s):  
Compression Ratio ◽  
Experimental Results ◽  
Pressure Relief Valve ◽  
Computer Simulation Model ◽  
Engine Fuel ◽  
Relief Valve ◽  
Pressure Relief ◽  
Variable Compression Ratio ◽  
Fuel Injectors ◽  
Variable Compression

This paper reports the development of a digital computer simulation model for a pressure-relief valve of the differential-angle type which is suitable for use in variable compression ratio pistons. The model was validated using experimental results and is intended as an aid to design. It can predict under unsteady flow the pressure distribution through the valve, the opening and closing pressures, volume flowrate, plunger velocity, and opening period. Predicted and experimental results are presented which show the effect of the valve geometry on its performance. The theoretical approach is also applicable to diesel engine fuel injectors of the differential-angle type.

scholarly journals Experimental research on the dynamic instability characteristic of a pressure relief valve

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983353 ◽  
Author(s):  
Wei Ma ◽  
Fei Ma ◽  
Rong Guo
Keyword(s):  
Dynamic Instability ◽  
Wave Model ◽  
Experimental Results ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Pipe Length ◽  
Multi Stage ◽  
Instability Characteristic ◽  
Quarter Wave

This article presents detailed experimental results of the influencing factors of flow rate, set pressure, and inlet pipe length of a pressure relief valve. In order to analyze the influence of different flow rates on the instability characteristics of pressure relief valve, the multi-stage output of pump flow is realized. In terms of modeling, we investigated the theory concerning instability in the system: the 3% rule boundary. Data analyses on typical stable, cycling, and chatter instability conditions are conducted. The stable boundaries of the 3% rule and the quarter-wave model are drawn, which are consistent with the experimental results.

Analytical Description of the Static and Dynamic Behaviour of a Pressure Relief Valve

2018 ◽  
Author(s):  
Sven Osterland ◽  
Jürgen Weber
Keyword(s):  
Dynamic Behaviour ◽  
Characteristic Curve ◽  
New Method ◽  
Pressure Relief Valve ◽  
Inertia Force ◽  
Relief Valve ◽  
Pressure Relief ◽  
Spreadsheet Program ◽  
Non Linear ◽  
The Stability

The paper presents an explicitly straightforward formulation of the stationary and dynamic behaviour of a pressure relief valve (PRV). This makes it possible to consider the static, dynamic and robustness properties of a PRV during the analysis or design process. A PRV can be understood as a self-regulating, cross-domain system. The governing equations are well known and widely used in literature. Usually, these include: a geometrical description of the flow area and the pressure surface, a flow equation, the pressure build-up equations, a spring-like counterforce, a flow force, a term for viscous friction and the inertia force. Together they form a system of ordinary non-linear differential equations of third order. So far, these equations had to be solved numerically in order to analyse or adapt the static or dynamic properties of a particular PRV. In this paper, direct analytical solutions for stationary and dynamic cases are derived. This results in an explicit equation for the respective p-Q characteristic curve. In addition, a simple criterion for the stability of a PRV was found. As it turns out, the minimum requirement for viscous damping is directly anti-proportional to the gradient of the p-Q characteristic curve. It is empirically known that decreasing the gradient of the p-Q curve makes the system more susceptible to oscillations. However, this has not yet been shown mathematically elegant. The method presented here calculates the static p-Q curve, the stability and natural frequencies of a PRV in a simple procedure using only elementary mathematics — no numerical scheme is required. Thus, the new method offers four main advantages. First, it is several orders of magnitude faster because it is not necessary to solve the differential equation system numerically. Secondly, the user does not require any special knowledge or advanced calculation tools — a simple spreadsheet program is sufficient. This eliminates licensing and training costs. Third, sensitivity and robustness analyses can be carried out easily because the dependencies are explicitly known. Last but not least, the understanding of a PRV is improved by knowing directly which parameters have what influence. The new method is tested and verified by comparison with conventional non-linear numerical simulations.

scholarly journals Statistical Performance Evaluation of Spring Operated Pressure Relief Valve Reliability Improvements 2004 to 2014

2015 ◽  
Author(s):  
Holly L. Watson ◽  
Robert E. Gross ◽  
Stephen P. Harris
Keyword(s):  
South Carolina ◽  
The United States ◽  
Pressure Relief Valve ◽  
United States Department ◽  
Relief Valve ◽  
Pressure Relief ◽  
Maintenance Program ◽  
Operational Systems ◽  
Pressure Relief Valves ◽  
Improved Performance

The United States Department of Energy’s Savannah River Site (SRS) in Aiken, South Carolina, is dedicated to promoting site-level risk-based inspection (RBI) practices in order to maintain a safe and productive work environment. Inspecting component parts of operational systems, such as pressure relief valves (PRVs), is a vital part of SRS’s safe operating envelope. This paper is a continuation of a SRS program to minimize the risks associated with PRV failures. Spring operated pressure relief valve (SOPRV) test data accumulated over the past ten years resulted in over 11,000 proof tests of both new and used valves. Improved performance is seen for air service valves resulting from changes to the maintenance program. Although, statistically significant improvement was not seen for liquid, gas, or steam service valves, analysis shows that the overall probability of failure on demand is trending down. Current SRS practices are reviewed and the reasons for improved performance are explored.

The Design and Research of Automatic Micro-Pressure Relief Valves Used in Mine Rescue Cabin

2015 ◽  
Vol 752-753 ◽  
pp. 828-832
Author(s):  
Nian Yong Zhou ◽  
Yan Long Jiang ◽  
Lei Xu ◽  
Jun Li ◽  
He Xu Wang
Keyword(s):  
Fast Response ◽  
Pressure Relief Valve ◽  
Opening Pressure ◽  
Relief Valve ◽  
Pressure Relief ◽  
Advantages And Disadvantages ◽  
Sealing Performance ◽  
Pressure Relief Valves ◽  
Relief Rate ◽  
Mine Rescue

By analyzing the key technologies of pressure relief valve and comparing the advantages and disadvantages of existing products, liquid sealing automatic micro-pressure relief valve is designed with the properties of adjustable opening pressure, fast response rate, good sealing performance and long life, etc. Also, a reasonable mathematical model of liquid sealing automatic micro-pressure relief valve is developed, and the pressure relief valve’s opening pressure, reset pressure, relief rate and other key performance parameters is obtained. This work wil be helpful for the design and research of automatic micro-pressure relief valves used in mine rescue cabin.

Real-Time Simulated Pressure Relief Valves in Physical Hydraulic Circuits

2005 ◽  
Author(s):  
Tero Eskola ◽  
Heikki Handroos ◽  
Takao Nishiumi
Keyword(s):  
Hydraulic System ◽  
Main Idea ◽  
Dynamic Responses ◽  
Pressure Relief Valve ◽  
Design Parameters ◽  
Relief Valve ◽  
Pressure Relief ◽  
The Real ◽  
Pressure Relief Valves ◽  
On Line

The present paper deals with hardware-in-the-loop (HIL) simulation of hydraulic components and systems. The main idea is to develop hydraulics by using a simulation model of it as a part of the machine. The interface between the real and simulated parts is defined by means of pressures and flows. The proposed idea makes it possible to test a variety of design parameters of a hydraulic system or single component on-line while running the practical experimental machine. The method is demonstrated in its application to a single-stage pressure relief valve in a simple hydraulic circuit. The real valve is replaced in the circuit by a HIL simulator mimicking the dynamic behavior of the valve. Finally the dynamic responses of original pressure relief valve and the HIL simulator are compared.

Dynamic Behavior of Spring-Loaded Pressure Relief Valve: Numerical and Experimental Analysis

2012 ◽  
Author(s):  
Leonardo Motta Carneiro ◽  
Luis F. G. Pires ◽  
Marcelo de Souza Cruz ◽  
Luis F. A. Azevedo
Keyword(s):  
Dynamic Behavior ◽  
Transient Behavior ◽  
Pressure Relief Valve ◽  
Flow Loop ◽  
Relief Valve ◽  
Pressure Relief ◽  
Operation Conditions ◽  
Disc Position ◽  
Pressure Relief Valves ◽  
Spring Type

The majority of oil and refined-product pipelines in Brazil have their protection system designs based on spring-type pressure relief valves. Thus, the proper design and operation of these valves is essential to ensure the safety of transport pipelines and loading/unloading terminals during any abnormal operation conditions that generate a surge pressure. In simple terms, these valves have a disk which is pressed by a spring against the inlet nozzle of the valve. When the pressure rises, the force generated on the surface of the disc increases and, depending on the pressure relief valve set point, the force due to pressure overcomes the force exerted by the spring, causing the disk to rise and discharge the fluid through the outlet nozzle to the relief line, reducing the pressure level within the pipeline. Despite its importance, most commercial applications do not present a specific model to simulate the transient behavior of pressure relief valves. This paper presents an experimental study aimed at determining the dynamic behavior of a commercial spring-type relief valve. The valve was installed in a pipe loop instrumented with pressure and flow transducers. The transient motion of the valve disc was measured with a fast-response displacement transducer. The transient in the flow loop was generated by the controlled closing of a block valve positioned downstream of the relief valve. The recorded transient data for disc position, upstream and downstream pressures, and discharge flow rates were used to compute the discharge coefficient as a function of opening fraction and the opening fraction as a function of time. Simulation models based on a spring-mass damped system were developed and implemented in a PID-actuator-control valve system. The systems were implemented in a commercial pipeline simulation program modeling the experimental loop employed in the tests. The numerical and experimental data of the block valve closure transient were compared displaying good agreement. Simulations results employing a generic relief valve model frequently used in simulations were also obtained revealing problems associated with this approach.

Optimization of Operation Parameters for Direct Spring Loaded Pressure Relief Valve in a Pipeline System

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Hyunjun Kim ◽  
Sanghyun Kim ◽  
Youngman Kim ◽  
Jonghwan Kim
Keyword(s):  
Pressure Relief Valve ◽  
Pipeline System ◽  
Relief Valve ◽  
Pressure Relief ◽  
Computational Costs ◽  
Constant Degree ◽  
System A ◽  
Disk Mass ◽  
Analysis Scheme ◽  
Surge Control

A direct spring loaded pressure relief valve (DSLPRV) is an efficient hydraulic structure used to control a potential water hammer in pipeline systems. The optimization of a DSLPRV was explored to consider the instability issue of a valve disk and the surge control for a pipeline system. A surge analysis scheme, named the method of characteristics, was implemented into a multiple-objective genetic algorithm to determine the adjustable factors in the operation of the DSLPRV. The forward transient analysis and multi-objective optimization of adjustable factors, such as the spring constant, degree of precompression, and disk mass, showed substantial relaxation in the surge pressure and oscillation of valve disk in a hypothetical pipeline system. The results of the regression analysis of surge were compared with the optimization results to demonstrate the potential of the developed method to substantially reduce computational costs.

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