High-flow rate miniature digital valve system
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Abstract:
Digital hydraulic valve systems can offer several benefits compared to spool-type proportional valves, such as faster response, more flow capacity, better fault tolerance and individual metering. However, the digital valve systems currently available are large, heavy and slow and therefore there is a need to miniaturise them and simultaneously make them faster. This article describes the design and performance of a digital valve system which can be used to replace a proportional valve with ISO 03 (NFPA D03, CETOP 3, NG6) standard interface. The valve system consists of 32 pilot operated miniature on/off valves which form four independently controlled metering edges. The valve system has small dimensions (176 × 49 × 72 mm) even though it contains integrated control electronics, its response time is approximately 2 ms and flow capacity per metering edge is 30 l/min at Δp = 0.5 MPa. These properties are good, however, improvements are required to reduce the leakage caused by the pilot valves, which can reach 5 l/min per metering edge at 10 MPa pressure difference.Keywords:
Metering mode
Control valves
Valve actuator
Leakage (economics)
Flow Control
Flow control valve
As to commonly used control valve such as shaped valve and ball valve in this paper, the measurement is carried out in the internal flow field for the test rig of control valve model by a number of micro pressure sensors which have high frequencies and good dynamic performances with collection and measurement system, especially in unstable and vibration conditions. Moreover the analyses of the experimental data are carried out by spectrum method. The result indicates that the flow field oscillation is less in shaped valve than in ball valve, so shaped valve is much more stable. From the point of safety, ball valve is not quite suitable for small valve open conditions. Figs 5, table 1 and refs 5.
Valve actuator
Control valves
Oscillation (cell signaling)
Internal flow
Flow control valve
Valve timing
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Accumulator (cryptography)
Valve actuator
Flow control valve
Control valves
Hydraulic accumulator
Pneumatic flow control
Electrohydraulic servo valve
Check valve
Pressure Control
Hydraulic pressure
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Valve actuator
Flow control valve
Bandwidth throttling
Control valves
Throttle
Pneumatic actuator
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Control valves
Fluid power
Valve actuator
Flow control valve
Electrohydraulic servo valve
Gate valve
Solenoid valve
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Accumulator (cryptography)
Control valves
Flow control valve
Valve actuator
Check valve
Electrohydraulic servo valve
Hydraulic accumulator
Pneumatic flow control
Pressure Control
Safety valve
Hydraulic pressure
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Valve actuator
Flow control valve
Control valves
Position (finance)
Electrohydraulic servo valve
Check valve
Pneumatic flow control
Flow Control
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This paper introduces the operation and the principle of shuttle controlled ball valve in pipeline transportation,and introduces the basic characteristic of an important element Adjustable Differential Flow Shuttle Valve ADFSV〔1〕in the shuttle controlled actuator,where the ADFSV as a speed control element can control gas/hydraulic actuators of ball valves,butterfly valves,gate valves,etc.Through a lot of experimental research,analysis,and simulation actuator test,it is proved that the shuttle controlled ball valve can prevent water hammer phenomena in pipeline transportation,damp fluctuation in gas transportation,and provide aa wider speed adjustment range.
Valve actuator
Control valves
Water hammer
Flow control valve
Flow Control
Ball (mathematics)
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Accumulator (cryptography)
Control valves
Flow control valve
Valve actuator
Pneumatic flow control
Hydraulic accumulator
Electrohydraulic servo valve
Check valve
Pressure Control
Needle valve
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Accumulator (cryptography)
Flow control valve
Valve actuator
Control valves
Electrohydraulic servo valve
Pneumatic flow control
Check valve
Hydraulic accumulator
Pressure Control
Hydraulic pressure
Valve timing
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This chapter discusses the characteristics and uses of the various types of valves and examines their flow characteristics. Valves used for on–off purposes have full or slightly reduced ports and are of symmetrical, straightway design such as ball valves and most gate valves. The closure members of some types of valves are traditionally called gates, discs, wedges, and plungers. These valves are referred to as multiturn or linear motion valves. Diaphragm valves have three simple elements: the valve body, the diaphragm, and the bonnet. A quarter turn opens or closes these valves. The closure members are in the form of a sphere, cylinder, or tapered plug that can be rotated to direct flow. The relief or safety valve is a self-actuated, fast opening valve used for quick relief of excessive pressure. The opening or closing of control valves is done by means of control mechanisms powered electrically, pneumatically, electro-hydraulically.
Flow control valve
Valve actuator
Control valves
Diaphragm (acoustics)
Needle valve
Closure (psychology)
Relief valve
Venous Valves
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