scholarly journals Developing a Pressure Control Valve for Air Extraction Cupping Device

2021 ◽  
Vol 38 (4) ◽  
pp. 308-316
Author(s):  
Jae Yong Lee ◽  
Dong Wook Shim ◽  
Soo Kwang An ◽  
Eun Seok Kim ◽  
Byung Ryul Lee ◽  
...  
Keyword(s):  
Control Valve ◽  
Pressure Control ◽  
Pressure Control Valve

scholarly journals Internal Flow and Hysteresis Characteristic of the Poppet Type Pressure Control Valve

2021 ◽  
Vol 52 (1) ◽  
pp. 8-15
Author(s):  
Seiei MASUDA ◽  
Fumio SHIMIZU ◽  
Masaki FUCHIWAKI ◽  
Kazuhiro TANAKA
Keyword(s):  
Control Valve ◽  
Internal Flow ◽  
Pressure Control ◽  
Hysteresis Characteristic ◽  
Pressure Control Valve ◽  
Type Pressure

scholarly journals The Miller tracheal cuff pressure control valve.

Anaesthesia ◽  
1993 ◽  
Vol 48 (4) ◽  
pp. 324-327 ◽  
Author(s):  
K. A. PAYNE ◽  
D. M. MILLER
Keyword(s):  
Cuff Pressure ◽  
Control Valve ◽  
Pressure Control ◽  
Pressure Control Valve ◽  
Tracheal Cuff

Suction Pressure Control Valve for Microneurosurgery

2020 ◽  
Vol 68 (3) ◽  
pp. 652
Author(s):  
DeepakK Jha ◽  
AbhijeetS Barath ◽  
OmP Thakur ◽  
Mayank Garg ◽  
Suryanarayanan Bhaskar
Keyword(s):  
Control Valve ◽  
Pressure Control ◽  
Suction Pressure ◽  
Pressure Control Valve

Modelling and Reducing Fuel Flow Pulsation of a Fuel-Metering System by Improving Response of the Pressure Control Valve During Pump Mode Switching in a Turbofan Engine

2019 ◽  
Author(s):  
Seiei Masuda ◽  
Fumio Shimizu ◽  
Masaki Fuchiwaki ◽  
Kazuhiro Tanaka
Keyword(s):  
Control Valve ◽  
Flow Region ◽  
Pressure Control ◽  
Low Flow ◽  
Mode Switching ◽  
Pump Mode ◽  
Turbofan Engine ◽  
Fuel Pump ◽  
Fuel Flow ◽  
Pressure Control Valve

Abstract In an aircraft turbofan engine, a fuel metering unit meters and supplies the required fuel to the engine according to the flight situation. When a centrifugal fuel pump (CFP) is used as the fuel pump, the ratio of hydraulic power per weight can be increased by raising the rated rotational speed, so the weight of the fuel pump can be decreased compared to when using a gear pump (GFP). There is an advantage that it can be reduced significantly. However, since the operating range of the fuel pump is wide, it is not effective to use CFP in an extremely low flow rate region because the fuel temperature rises due to its PQ characteristics and a large loss. Therefore, it is considered effective to combine CFP and GFP as pressure sources, and to use GFP in the low flow region and CFP in the high flow region. For that purpose, it is necessary to have a pump mode switching mechanism. The disadvantage in this case is that changing the pump mode causes a large pressure change of the fuel pressure source, which in turn causes fuel flow pulsations. There are three possible ways to solve this problem. The first method is to keep the differential pressure control valve (DPCV) unit response constant, which keeps the metering valve differential pressure constant in FMS. A second method is to remove high frequency components that the DPCV cannot follow pressure changes in the fuel control system. A third method is to keep the pressure difference between the two fuel sources small and to reduce the amplitude of the applied disturbance. In this paper, the first method, which makes DPCV response high response, is verified by modeling and simulation, and its effectiveness is confirmed.

scholarly journals Influence of Coolant Pressure Size on Surface Roughness when Stainless Steel Machining

2019 ◽  
Vol 299 ◽  
pp. 04002
Author(s):  
Robert Cep ◽  
Lenka Cepova ◽  
Cristina Stefana Borzan ◽  
Jiri Kasal ◽  
Marek Sadilek ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Pressure ◽  
Stainless Steel ◽  
Control Valve ◽  
Pressure Control ◽  
Optical Microscope ◽  
Contact Method ◽  
External Cooling ◽  
Pressure Control Valve ◽  
Valve Housing

The paper is focused on the influence of the coolant pressure on the surface roughness of the workpiece when machining stainless steels. The components were machined on a STAR SR-32J dual spindle machining center and an external cooling unit HYTEK CHAV 160/150-AF-F-OL was used for cooling. Two stainless steel components were investigated, namely the gas control valve rod and the high-pressure control valve housing, which require low roughness Ra after machining (less than 0.375 and 0.25 micrometers respectively). The first component was tested at 8 different pressures in the range of 150 bar - 10 bar and the second component at 4 different pressures in the range of 120 bar - 10 bar. The roughness parameters were measured by the contact method using the MITUTOYO Surftest SJ-410 Roughness Tester and the Alicona InfiniteFocus optical microscope. Based on these sample input parameters, it was evaluated howmuch the pressure affects the surface quality or suggested its reduction due to the high cost of operation of the external high-pressure equipment.

scholarly journals Hardware-Simulator Development and Implementation for Hydraulic Turbine Generation Systems in a District Heating System

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 368 ◽  
Author(s):  
Sung-Soo Jeon ◽  
Young Jae Lee ◽  
Yeongsu Bak ◽  
Kyo-Beum Lee
Keyword(s):  
Control Strategies ◽  
District Heating ◽  
Control Valve ◽  
Electrical Energy ◽  
Heating System ◽  
Hydraulic Turbine ◽  
Pressure Control ◽  
Differential Pressure ◽  
District Heating System ◽  
Pressure Control Valve

This paper presents not only a hardware-simulator development for hydraulic turbine generation systems (HTGS) in a district heating system (DHS) but also its control strategies and sequence. Generally, a DHS uses a differential pressure control valve (DPCV) to supply high-pressure–high-temperature fluids for customers depending on distance. However, long-term exposure of the DPCV to fluids increases the probability of cavitation and leads to heat loss in an event of cavitation. Therefore, a HTGS was introduced to solve this problem. It performs differential pressure control of the fluids, replaces the DPCV, and converts excess energy wasted by the DPCV to electrical energy. In this paper, the development of a hardware-simulator for HTGSs with a back-to-back converter, which uses two-level topologies, is proposed; moreover, control strategies and sequence used in this design are presented. The performance and validity of the proposed hardware-simulator and its control strategies are demonstrated by experimental results.

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