Failure analysis of spring of hydraulic operated valve

Pal, Urbi; Mukhopadhyay, Goutam; Bhattacharya, Sandip

doi:10.1016/j.engfailanal.2018.09.013

Cited by 14 publications

(2 citation statements)

References 8 publications

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“…Moreover, the spring of the safety valve may suffer from chemical corrosion by media. The literature has several works about spring failures, and spring failures may be due to fatigue [1][2][3], corrosion [4], manufacturing flaws [5][6], or improper heat treatment [7].…”

Section: Introductionmentioning

confidence: 99%

Research on corrosion behavior of safety valve spring in liquid chlorine tank

Li,

Jiang,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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The corrosion behavior of the safety valve spring in the liquid chlorine tank is investigated in this study. The chemical composition, metallographic structure and hardness of the spring are also analyzed. The higher hardness of spring steel is caused by lower tempering temperatures. The corrosion product is grey with many cracks, spalling and pitting is also found. The phenomenon that where there is higher chloride, there is higher carbon is observed. Chloride ion is adsorbed by carbides and then pitting preferentially nucleate at carbides.

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Section: Introductionmentioning

confidence: 99%

Research on corrosion behavior of safety valve spring in liquid chlorine tank

Li,

Jiang,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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“…Single stage proportional valves can only be used in the small flow conditions owing to the performance limitation of electromagnet, while two-stage proportional valves can be used in the large flow conditions [1,2]. In the two-stage proportional valves, the feedback types for proportional control include electric position feedback, force position feedback and hydraulic position feedback [3][4][5]. The twostage proportional valve with hydraulic position feedback was originally developed by Andersson.…”

Section: Introductionmentioning

confidence: 99%

Flow Control for a Two-Stage Proportional Valve with Hydraulic Position Feedback

Wang

Huang

et al. 2020

Chin. J. Mech. Eng.

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The current research mainly focuses on the flow control for the two-stage proportional valve with hydraulic position feedback which is named as Valvistor valve. Essentially, the Valvistor valve is a proportional throttle valve and the flow fluctuates with the change of load pressure. The flow fluctuation severely restricts the application of the Valvistor valve. In this paper, a novel flow control method the Valvistor valve is provided to suppress the flow fluctuation and develop a high performance proportional flow valve. The mathematical model of this valve is established and linearized. Fuzzy proportional-integral-derivative (PID) controller is adopted in the closed-loop flow control system. The feedback is obtained by the flow inference with back-propagation neural network (BPNN) based on the spool displacement in the pilot stage and the pressure differential across the main orifice. The results show that inference with BPNN can obtain the flow data fast and accurately. With the flow control method, the flow can keep at the set point when the pressure differential across the main orifice changes. The flow control method is effective and the Valvistor valve changes from proportional throttle valve to proportional flow valve. For the developed proportional flow valve, the settling time of the flow is very short when the load pressure changes abruptly. The performances of hysteresis, linearity and bandwidth are in a high range. The linear mathematical model can be verified and the assumptions in the system modeling is reasonable.

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Failure Analysis of the Faulty Locomotive Coil Spring

He,

2024

J Fail. Anal. and Preven.

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Failure analysis of spring of hydraulic operated valve

Cited by 14 publications

References 8 publications

Research on corrosion behavior of safety valve spring in liquid chlorine tank

Research on corrosion behavior of safety valve spring in liquid chlorine tank

Flow Control for a Two-Stage Proportional Valve with Hydraulic Position Feedback

Failure Analysis of the Faulty Locomotive Coil Spring

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