Browse Topic: Valves
With the advent of electric and hybrid drivetrain in the commercial vehicle industry, electrically driven reciprocating compressors have gained widespread prominence. This compressor provides compressed air for key vehicle systems such as brakes, suspension systems and other auxiliary applications. To be a market leader, such an E-compressor needs to meet a myriad of design requirements. This includes meeting the performance by supplying air at required pressure and flow rate, durability requirements and having a compact design while maintaining cost competitiveness. The reed valve in such a compressor is a vital component, whose design is critical to meet the aforementioned requirements. The reed valves design has several key parameters such as the stiffness, natural frequency, equivalent mass, and lift distance which must be optimized. This reed valve also needs to open and close rapidly in response to the compressor operating speed. Since it is the order of milliseconds, the valve
This standard covers oxygen masks and breathing valves used with both panel mounted and mask mounted demand and pressure-demand oxygen regulators. Mask mounted oxygen regulators are covered under other standards, but when the mask mounted regulator incorporates an integral exhalation valve, the performance of this valve shall meet the requirements of this standard
The process of manufacturing high-quality and reliable balloon catheters is critical to a number of advanced medical treatments for patients including balloon angioplasty, stent and drug delivery, transcatheter aortic valve implantation, atherectomy, renal denervation, and laser balloon angioplasty. These minimally invasive procedures have vastly improved quality of life, increased patient safety, decreased recovery times, and lowered treatment costs for patients around the globe
Manufacturers of automation components have long made pneumatic valve terminals with IP65 and IP67 ratings that can be mounted anywhere on a machine. This is particularly useful for connecting valves as close to pneumatic actuators as possible. Doing so shortens the length of tubing, reduces the occurrence and severity of leaks, and increases actuator performance by shortening cycle times. Decentralized valve terminals communicate with the machine controller or PLC via an industrial Ethernet network. In addition to valves, terminals are configured with input and output modules to allow for easy connection of sensors, switches, and other field-level devices to the industrial network
This SAE Recommended Practice establishes uniform Installation Parameters for desiccant Air Dryers for vehicles with compressed air systems
This specification provides requirements and procedures for gas-pressure leak testing of parts
This specification covers hand and air operated, solvent and oil spray guns
This standard covers all types of manually operated high pressure oxygen, cylinder shut off valves for use in commercial aircraft. It is intended that the valve shall be attached to a pressure cylinder storing oxygen under a nominal pressure of 12.76 MPa (1850 psig) at 21 °C (70 °F). Upon opening the valve, oxygen will be permitted to discharge from the storage cylinder to the valve outlet and to other downstream components of the oxygen system. It shall also be possible to recharge the cylinder through the valve
In this paper, an innovative EGR valve, containing an integrated self-cleaning function to mitigate the progressive buildup of carbon deposits, is described. Conventional EGR valves use Butterfly and Poppet mechanisms to open and close a round shaped exhaust gas port with limited ability to remove exhaust carbon deposits from the affected surfaces and mechanical elements. The self-cleaning EGR valve, instead, combining both rotational and linear motions, continuously sweeps its internal passages while delivering the gas flow, removing the carbon deposits before they can adhere to the internal surfaces
Technologies transition from dominance to nearly dead at different speeds and for various reasons. That's particularly true for motive power. Pistons, cams and valves are giving way to anodes, cathodes and inverters. Governments and OEMs are pledging hard deadlines (2035!) to end sales of combustion-engine light vehicles. Amid the radical changes, what becomes of the V8 - the engine type that has defined American cars and trucks and has spurred their sales for the past 70 years? It took more than two decades for the automobile to end the horse's reign as the mainstream prime mover. Well into the heyday of Ford's Model T, streets in many U.S. towns remained clogged with horse-drawn vehicles, period photos show
HP's binder jetting technology and GKN's manufacturing expertise helped John Deere realize its first 3D-printed metal part for mass production. HP launched its new commercial Metal Jet S100 Solution in September 2022 and two months later showcased the 3D printer for the first time publicly at the Formnext exhibition in Frankfurt, Germany, along with a new John Deere production application. Together with GKN Sinter Metals, John Deere is using the Metal Jet technology to produce thermal diverter valves in the fuel system for its small and midsize tractors assembled in Mannheim, Germany. “Our focus on innovation and sustainability is at the core of everything we do for our customers,” said Dr. Jochen Mueller, manager global digital engineering at John Deere. “We are proud to be among the first in the agricultural industry to leverage the benefits of 3D printing for both prototyping and final-parts production. Leveraging industrial 3D-printing platforms for polymers and metals, we are
Danfoss Power Solutions claims to increase the productivity of excavators while reducing their fuel consumption by up to 15% by swapping out the machine's main hydraulic pump for a Digital Displacement pump, custom software and controller. The system - appropriately called Dextreme Swap - has been fitted to three 20-ton diesel-powered Volvo EC200 excavators in Ashcourt Group's fleet for field trials, in collaboration with U.K. Volvo dealership SMT. “Our Dextreme Swap system is configured for installation directly into excavators without modification to the existing main control valve,” Leif Bruhn, head of Digital Displacement, Danfoss Power Solutions, told Truck & Off-Highway Engineering. “We offer a simple first step for OEMs to experience and validate the benefits Dextreme systems can bring from a control and integration standpoint.” Danfoss highlighted the Dextreme system at CONEXPO/IFPE 2023 (International Fluid Power Exposition) in Las Vegas
Excessive internal valve leakage is an inefficiency that worsens upstream system inefficiencies. Effective valve design is the solution. Electric vehicle thermal management requires OEMs and suppliers to control many variables that potentially create excessive heat. Designing thermal-management systems (TMS) to effectively control these variables is critical to overall EV performance. Internal leakage and other coolant-valve performance criteria are among the variables affecting EV performance, most notably driving range. Valve design is fundamental to a robust, thermally efficient and leak-free system, according to engineers at Robertshaw Controls, a specialist in plastic coolant-valve innovation and TMS design
This procedure applies to directional control valves or other valves which in various positions direct or block fluid flow as applied to Off-Road Self-Propelled Work Machines as referenced in SAE J1116
Air Supply Unit (ASU) serves as the pneumatic source for the air suspension system in the passenger car segment. The ASU is an electrically driven oil-free compressor with integrated air dryer to deliver dry air to the suspension system. Solenoid valve, Height Sensor and ECU adjusts the pressure in bellow based on the vehicle load condition. During the lab test, pressure was not building up in the compressor due to delivery valve failure. The type of valve in asu is reed valve type, it is mostly used in the micro compressors due to its low cost, simple structure and light weight configuration. The reed movement is based on the pressure difference between the inlet and the compression chamber. Failure analysis is carried out based on the finite element analysis to identify the root cause, the root cause identified is optimized to prevent the failure. An accelerated test condition is arrived based on the FEA and a tailored series of accelerated tests are carried out to reproduce the
This SAE Aerospace Recommended Practice (ARP) covers the design and installation requirements for hydraulic systems (up to 8000 psig [56 MPa]) for ground support equipment (GSE). This ARP is derived from AS5440, which provides hydraulic system requirements for aircraft. The recommendations herein are primarily intended for GSE that exchange hydraulic fluid with the aircraft, such as hydraulic service carts, rather than GSE with non-interfacing hydraulic systems. The GSE may be mobile, portable, or stationary
This SAE Recommended Practice is designed to reveal discoloration which may occur when nonmetallic materials used for trimming automobiles are exposed for a limited time to an atmosphere containing hydrogen sulfide
As NASA plans for manned missions to Mars, efforts are being made to identify technologies that must be improved to make such trips feasible. Without improvements in valve technologies, propellant and commodity losses will likely make long-duration space missions infeasible. Engineers at NASA's Marshall Space Flight Center have developed a self-aligning poppet for low leakage valves a seat alignment technology that eliminates the need to precisely control interfaces between poppet sealing surfaces and the valve seat seal
Pressure regulating valves are one of the indispensable components in an aircraft. Its application is found in many critical systems such as anti-icing system, cabin pressurization, propulsion system, hydraulic system etc. In this study, the simulation and dynamic analysis of a pressure regulating anti-icing valve is discussed. The valve comprises of an arrangement of sliding piston and pressure chamber to regulate the pressure. It also includes a feedback loop to achieve self-regulation. The valve includes two functional halves for robustness as well as to have some redundant functionality if some components doesn’t function optimally as the operation calls for accuracy as well as precision. The principles behind the working of this valve includes the interaction of physical domains such as mechanical and fluid dynamics. The modeling of this valve is carried out in multi-domain physical state simulation in MATLAB/SIMULINK platform. It is followed by the dynamic analysis to study the
This SAE Aerospace Information Report presents a glossary of terms commonly used in the ground delivery of fuel to an aircraft and pertinent terms relating to the aircraft being refueled
Increasing rail pressure is the development trend of high-pressure common rail system. When the rail pressure reaches ultrahigh range, fuel leakage of precision coupling components could have a significant impact on system performance. In order to investigate the effects of system and structure parameters on the leakage characteristics of precision coupling components, guide the design of ultrahigh-pressure common rail system, simulations were carried out. Variation of fuel leakage were studied with different structure and system parameters. A three-dimensional model of oil film with eccentric was developed to simulate eccentric between two parts of coupling component. The leakage in control valve component increases with common rail pressure; however, there is no obvious change in leakage of control piston component with rail pressure. Leakage flow rates in both components increased for about 27 times with the coupling component clearance widths increase from 2 μm to 6 μm, due to the
High speed on-off valves (HSVs) are widely used in advanced hydraulic braking actuators, including regenerative braking systems and active safety systems, which take crucial part in improving the energy efficiency and safety performance of vehicles. As a component involving multiple physical fields, the HSV is affected by the interaction of the fields-fluid, electromagnetic, and mechanical. Since the opening of the HSV is small and the flow speed is high, cavitation and vortex are inevitably brought out so that increase the valve’s noise and instability. However, it is costly and complex to observe the flow status by visual fluid experiments. Hence, in this article a visual multi-physics system simulation model of the HSV is explored, in which the flow field model of the HSV built by computational fluid dynamic (CFD) is co-simulated with the model of hydraulic actuator established by AMESim. Accordingly, the pressure and the opening of the HSV vary with actual working state of the
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