Dynamic Characteristics and Stability Analysis of Conical Relief Valve

Jia, Wenhua

doi:10.5755/j01.mech.25.1.22881

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…The most unfavorable situation of the water level fluctuation of the EDB is that the flow in the pipe behind the box stops quickly and completely, i.e., the end valve closes quickly, =0 Q . Combining Equations (10) and (11), one can obtain the following: 12is a simple harmonic vibration equation. By introducing the initial parameters of the gravitational flow transition system, the oscillation period and amplitude of the water level in the EDB can be obtained as follows:…”

Section: Relationship Between Location Of Edb and Amplitude Of Water mentioning

confidence: 99%

“…When the pressure head in front of the valve decreases, the valve automatically closes [8][9][10]. Because the outlet of the PRV is connected to the tank, the pressure head drop of the PRV is frequently equal to that of the inlet pressure head [11]. However, using a PRV must be done with caution as an inappropriate selection can worsen the system transient response [12].…”

Section: Introductionmentioning

confidence: 99%

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Optimal Location of Energy Dissipation Box in Long Distance and High Drop Gravitational Water Supply System

Zhang

Chen

2021

Water

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In the long-distance and high-drop gravitational water supply systems, the water level difference between the upstream and downstream is large. Thus, it is necessary to ensure energy dissipation and pressure head reduction to reduce the pipeline pressure head. The energy dissipation box is a new type of energy dissipation and pressure head reduction device, which is widely used in the gravitational flow transition systems. At present, there is still a dearth of systematic knowledge about the performance of energy dissipation boxes. In this paper, a relationship between the location of the energy dissipation box and the pressure head amplitude is established, a theoretical optimal location equation of the energy dissipation box is derived, and numerical simulations using an engineering example are carried out for verification. The protective effects of an energy dissipation box placed at the theoretical optimal location and an upstream location are compared. The results indicate that for the same valve action time, the optimal position allows effectively reducing the total volume of energy dissipation box. The oscillation amplitudes of the water level in the box and the pressure head behind the box are markedly reduced. Under the condition that the water level oscillation of the energy dissipation box is almost the same, the optimal location offers better pressure head reduction protection performance than the upstream location.

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Section: Relationship Between Location Of Edb and Amplitude Of Water mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Location of Energy Dissipation Box in Long Distance and High Drop Gravitational Water Supply System

Zhang

Chen

2021

Water

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“…Besides, the permanent magnet was made from a brittle material, which was expensive. Literature [8] established a dynamic characteristic model of the cone relief valve and analyzed the influence of its design parameters on the dynamic characteristics of the valve system. Literature [9,10] analyzed the influences of the damping, orifice and cavity volumes, and other factors on the relief valve through modeling, simulations, and experiments, and they proposed that proper damping can effectively improve the dynamic performance of relief valves.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dynamic Characteristics of Pressure-Regulating and Pressure-Limiting Combined Relief Valve

Shi

Wang

et al. 2021

Mathematical Problems in Engineering

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Aiming at the problem of the lack of a cooperation mechanism of combined relief valves, this paper proposes a new pressure-regulating and pressure-limiting combined relief valve. Combined with the ordinary relief valve dynamic characteristic analysis method, the dynamic model of the combined relief valve under normal working conditions was established, and its dynamic characteristics were simulated using Simulink. The results showed that the multi-pressure stabilization design of the combined relief valve improves its usability and stability. Under the same structural parameters, the overshoot of the combined relief valve was 5.7%, and the response time was 12 ms, which is better than the ordinary relief valve. Besides, it effectively improves the instability problems, such as the vibration and the large pressure fluctuation of the ordinary relief valve under high pressure and large flow conditions. When the sum of the effective force area on the upper side of the flange of the pressure-regulating valve core and the area of the tail vertebra is equal to the effective force area of the lower side of the flange of the pressure-regulating valve core, the dynamic performance of the relief valve is optimal. For example, if the effective force area under the flange is 1.8 cm2, then the inlet pressure overshoot is 2.8%, and the response time is 10 ms. An appropriate volume of the sensitive cavity, the quality of the valve core, and the fluid resistance of the pressure relief valve are factors that can effectively improve the dynamic performance of the pressure-regulating and pressure-limiting combined relief valve.

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“…The present study adopts the poppet type due to the following considerations. Poppet valves, as compared to spool valves, require less stringent machining tolerances, are less susceptible to contamination problems, have very low leakage, which make it possible to eliminate two separate supply lines [5] and hence, have been widely used for pressure relief [6][7]. It is natural to design the valve as the diaphragm-spring-poppet configuration as shown in Figure 2a, which is flow-to-open, spring-to-close.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Design of the Automatic Pressure Regulating Valve in the Foam Firefighting System

Yang

Chen

et al. 2020

Processes

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This paper presents a novel design of the automatic pressure balancing valve, used in the in-line balanced pressure (ILBP) proportioner for the foam firefighting system, at a required percentage of solution. Featured in a four-chamber configuration with a double-acting diaphragm actuator, it can automatically maintain the foam concentrate pressure with the pressure in the supply water pipeline, within a precision level of 0.02 MPa (or 1.3%), under the design operating condition. The static characteristics at the equilibrium state have been discussed in terms of poppet displacement with reference to the geometrical dimensions and operating pressures of the valve. The dynamic response of the valve during the startup has been examined through building the mathematical model of the forces on the valve and solving it numerically using MATLAB. The results show that the response time of the valve is always less than 0.01 s, which fully satisfies the stability and hysteresis requirement. The prototype has been tested in the laboratory, which agrees well with the numerical results. It was then successfully put into production, forming the first series of ILBP foam pump firefighting system in China.

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Dynamic Characteristics and Stability Analysis of Conical Relief Valve

Cited by 8 publications

References 13 publications

Optimal Location of Energy Dissipation Box in Long Distance and High Drop Gravitational Water Supply System

Optimal Location of Energy Dissipation Box in Long Distance and High Drop Gravitational Water Supply System

Analysis of Dynamic Characteristics of Pressure-Regulating and Pressure-Limiting Combined Relief Valve

Modeling and Design of the Automatic Pressure Regulating Valve in the Foam Firefighting System

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