scholarly journals Force assisted discharge valve for piston compressors

2021 ◽  
Vol 1180 (1) ◽  
pp. 012019
Author(s):  
L Dür ◽  
A Egger ◽  
M Lang ◽  
R Almbauer
Keyword(s):  
Discharge Valve

scholarly journals Mechanical and deformation characteristics of rotary compressor discharge valve

2021 ◽  
Vol 1180 (1) ◽  
pp. 012018
Author(s):  
YS Hu ◽  
J Xu ◽  
O X Yang ◽  
J Gao ◽  
X Y Zhang ◽  
...  
Keyword(s):  
Rotary Compressor ◽  
Deformation Characteristics ◽  
Discharge Valve

Interrelationship Between the Efficiency Characteristics and the Pressure Head Gradients Among Axial Flow Pumps

1996 ◽  
Author(s):  
Takaharu Tanaka
Keyword(s):  
Cross Section ◽  
Flow Rate ◽  
Axial Flow ◽  
Internal Flow ◽  
Pressure Head ◽  
Design Flow ◽  
Discharge Valve ◽  
Head Gradient ◽  
Axial Flow Pump ◽  
Flow Pump

There is a correlation between the efficiency of the pump to the head produced. On the axial flow pump, whose efficiency characteristic is favorable, the pressure head gradient between the impeller inlet and the outlet sections, at an equivalent flow rate, may become larger than that for the less favorable axial flow pump. This fundamental interrelation may be held in the flow passage regardless to the flow rate whichever they are operated at design or off design flow rate. There may be a direct correlation between the efficiency of an axial flow pump and the ratio of the discharge valve cross section divided by the pipeline cross section. The smaller this ratio is the better the pressure head gradient is for the same flow rates. This ratio may be useful to estimate relative grade of heads, pressure head gradients, internal flow conditions, and efficiency characteristics among axial flow pumps.

Fault Diagnosis of Reciprocating Compressor Valve Using Acoustic Emission

2012 ◽  
Author(s):  
Y. F. Wang ◽  
X. Y. Peng
Keyword(s):  
Acoustic Emission ◽  
Acoustic Emission Signal ◽  
Reciprocating Compressor ◽  
Flow Passage ◽  
Emission Signal ◽  
Fault Features ◽  
Discharge Valve ◽  
Valve Disc ◽  
Deviation Degree ◽  
Discharge Pressure

The faults of a reciprocating compressor valve can be diagnosed using the acoustic emission. Four typical valve faults including the crack, rupture and deformation in the valve discs and leakage through the flow passage were investigated. The fault features were extracted by comparing the acoustic emission signals from the failed valves with those from the normal valves. The results show that the feature locations where the discharge valve opened and closed could easily be identified by the envelope waveform of acoustic emission signal, and they changed when the valve failed including the rupture and deformation in valve discs and leakage through the flow passage and changed with the variation of the discharge pressure. The extent to which the valve failed could be estimated by the deviation degree between the opening/closing locations and the standard ones. The leakage caused by these valve faults could also lead to the increase in the amplitude of the acoustic emission wave. However, the fault of crack in valve disc couldn’t be identified by acoustic emission signal effectively.

Fault Diagnosis of Emulsion Pump Valve

2010 ◽  
Vol 42 ◽  
pp. 73-76
Author(s):  
Xiao Ming Han
Keyword(s):  
Fault Diagnosis ◽  
Valve Seat ◽  
Singularity Detection ◽  
Hysteresis Characteristic ◽  
Valve Spring ◽  
Discharge Valve ◽  
Valve Disc ◽  
Pump Valve ◽  
Opening And Closing ◽  
The Impact

The abruption of the valve spring will deteriorate the opening and closing hysteresis characteristic and reduce the volumetric efficiency of the emulsion pump further. With the singularity detection and the improved algorithm of the Lipschitz exponents based on least median of squares, the singularities in signals could be localized to find the impact hour between the discharge valve disc and the valve seat or the lift limiter. The diagnosis results show that the discharge valve spring abruption fault of the emulsion pump can be identified correctly and effectively.

Study of Pulsation Pressures in the Stages of an Electric Submersible Pump at Shut-Off Under Various Speeds of Operation

2020 ◽  
Vol 13 (2) ◽  
pp. 171-183
Author(s):  
Arumugam Dhanasekaran ◽  
Sivasailam Kumaraswamy
Keyword(s):  
Pressure Pulsation ◽  
Pressure Fluctuations ◽  
Submersible Pump ◽  
Variable Frequency Drive ◽  
Prolonged Length ◽  
Unsteady Pressure ◽  
Discharge Valve ◽  
Closed Position ◽  
Valve Position ◽  
Electric Submersible Pump

Background: Electric Submersible Pumps (ESPs) are widely used in agricultural fields, petroleum, and various other industries. These pumps are mostly driven at a constant speed since an A.C. motor is normally used as the drive. However, ESPs can also be operated at various speeds by employing a Variable Frequency Drive (VFD). Several patents have been published in ESP. Normally these pumps are started with the discharge valve at its closed position in order to control the starting current. When the ESP runs at its shut-off position, it will develop a higher head and an increase in fluctuating pressure. In order to evaluate the effects of pressure fluctuation, its characteristics must be investigated. Objective: Experimentally investigate the characteristics of pressure pulsation which are generated at each stage of a multistage ESP during shut-off condition at various speeds. Methods: An ESP with five stages was selected for conducting experiments. A VFD was used for operating the ESP at five speed settings from 80 to 120 % of its rated speed. Piezoresistive transducer was placed at the delivery side of the pump to acquire the signals of unsteady pressure. The pump was operated at closed valve condition at each speed, and unsteady pressure signals due to pressure pulsation were captured. Results: Obtained results have indicated the presence of fundamental frequency pertaining to vane passing frequency and harmonics of higher frequencies. Conclusion: Study of pressure fluctuations at shut-off will help to analyze the failures of ESP due to vibration which occur when the pump runs at closed valve position for a prolonged length of time and stability of these pumps at lower flow rates.

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