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valves
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Image
Published: 01 September 2008
Fig. 41 (a) Forging tools for production of automotive engine valves; the analyzed die was painted in blue. (b) Forged valve and, in detail, the grooves produced when using worn dies. (c) Three analyzed regions, marked “A”, “B” and “C”. “A” is the main wear region, but “B” is where a large
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Published: 01 December 1995
Fig. 2-96 12 in. (300 mm) plug valves installed on gas scrubbers
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Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
... Abstract An aircraft crashed following the loss of yaw control in full airborne flight. The subsequent discovery of broken shutter bolts in the rear pitch reaction control valve led to an inspection campaign that found bolt failures of a similar nature in valves on several other aircraft...
Abstract
An aircraft crashed following the loss of yaw control in full airborne flight. The subsequent discovery of broken shutter bolts in the rear pitch reaction control valve led to an inspection campaign that found bolt failures of a similar nature in valves on several other aircraft. The bolts were removed and analyzed to determine the mode and cause of failure. Based on the results of macroscopy, scanning electron fractography, metallographic examination, and chemical analysis, the failures were caused by stress corrosion cracking, and in one case, overtightening.
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Published: 01 February 2005
Fig. 22.28 Exhaust valve forming process. (a) Initial billet. (b) Extrusion of valve stem. (c) Upsetting of valve head [ Tulsyan et al., 1993 ]
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Published: 01 December 2018
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Published: 30 November 2013
Fig. 1 Distorted engine valve spring (left) compared with normal valve spring. Improper microstructure resulted in inadequate strength and hardness at the operating temperature. Source: Ref 1 , 2
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Published: 01 August 2012
Fig. 12.17 Use of prefill valve in hydraulic press: (a) the prefill valve is opened when the slide is in the fast approach stroke, (b) the prefill valve is closed during the forming stroke, and (c) the prefill valve is opened when the slide is in fast return stroke. Source: Ref 12.27
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Published: 01 December 1995
Fig. 11-9 Cast-weld intercept valve. An assembly weld of a valve casting and a flanged elbow casting
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in Cold Spray Applications in Repair and Refurbishment for the Aerospace, Oil and Gas, and Power-Generation Industries
> High Pressure Cold Spray: Principles and Applications
Published: 01 June 2016
Fig. 11.7 (a) Corrosion and sealing surface valve actuator body repair application (TD-3, U.S. Navy), using cold-sprayed aluminum on steel. (b) Airframe-mounted accessory drive housing repair buildup. Source: Ref 11.14
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Published: 01 January 2000
Fig. 6 Deep pits on a carbon steel check valve that was inadvertently exposed to hydrochloric acid during a plant upset. Note how pits intersect to form areas of jagged metal loss. A steel probe tip is also shown in the photo. Source: Nalco Chemical Company
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Published: 01 January 2000
Fig. 11 Closeup of annular regions below rubber O-rings on a cast-iron valve block. Note how damage varies from hole to hole, probably due to variation in the crevice geometry. Source: Nalco Chemical Company
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in Cold Spray Applications in the Defense Industry
> High Pressure Cold Spray: Principles and Applications
Published: 01 June 2016
Fig. 9.13 Experimental setup for repair of the actuator valve body. Courtesy of South Dakota School of Mines and Technology
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Published: 01 December 2015
Fig. 4 Hardfaced stainless steel plug and seat, from a slurry flow control valve, that were eroded by high-velocity flow through the narrow orifice created during throttling
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Published: 01 December 2015
Fig. 6 Erosion of a rotary valve handling dust from a cyclone. The wear plates in the valve show some material loss, but the major damage is to the casing. Gaps between the casing and the valve allowed leakage of high-velocity air with entrained dust.
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Published: 01 September 2008
Fig. 42 (a) Microstructure of working regions of valve forging die in Fig. 41 (region A). Note the intense cracking and thick nitrided layer (double the expected). Also note the surface white layer, which corresponds to brittle untempered martensite, obtained by rehardening of the tool
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in Failure Analysis of Powder Metal Steel Components
> Failure Analysis of Heat Treated Steel Components
Published: 01 September 2008
Fig. 10 Pinhole in the valve seat at a magnification of 40 : 1
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in Failure Analysis of Powder Metal Steel Components
> Failure Analysis of Heat Treated Steel Components
Published: 01 September 2008
Fig. 18 Exhaust valve seat with oxidized hard-phase particles
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Published: 01 October 2011
Fig. 16.13 Thermal fatigue crack produced in the hardfacing alloy on an exhaust valve from a heavy-duty gasoline engine
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Published: 30 November 2013
Fig. 8 Thermal-fatigue crack in the hardfacing alloy on an exhaust valve from a heavy-duty gasoline engine (~2.5×). Advanced burning originated from the large crack. Additional thermal-fatigue cracks are also present on the valve face. Engine efficiency rapidly deteriorates from increasing
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