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Hydraulic valves

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0092148
EISBN: 978-1-62708-235-8
...Abstract Abstract Occasional failures were experienced in spool-type valves used in a hydraulic system. When a valve would fail, the close-fitting rotary valve would seize, causing loss of flow control of the hydraulic oil. The rotating spool in the valve was made of 8620 steel and was gas...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001422
EISBN: 978-1-62708-229-7
...Abstract Abstract During a hydraulic test on one of the boilers in a range, leakage occurred from the lower surface of a horizontal S bend in the main steam pipe between the drum connector box and the junction valve. The pipe in question was 15 in. bore and had been in service for about 50...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
...-bore fitting and two ASME SB-148 CA 954 valve bodies) and an entire valve assembly. The leaks were found to be in the socket-weld crevice area and had resulted from dealloying. It was recommended that the weld joint geometry be modified. Control valves Cooling systems Cooling water Hydraulic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... heat treatment, producing a low-strength structure of ferrite and tempered martensite. Fig. 11 Cross sections through the carburized 1117 steel cylinders from two spool-type hydraulic valves. The cylinder of the valve that operated satisfactorily (a) had little retained austenite in the case...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... type of ammunition were fired in the test. (a) Inside diameter. (b) Outside diameter Fig. 11 Cross sections through the carburized 1117 steel cylinders from two spool-type hydraulic valves. The cylinder of the valve that operated satisfactorily (a) had little retained austenite in the case...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001353
EISBN: 978-1-62708-215-0
... Most Probable Cause The basic cause of failure was overloading of the flap valve due to hydraulic shock waves in the line and use of a low-toughness forging material. The step in the forging acted as a notch. Remedial Action To avoid such failures, steels with improved impact properties...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001138
EISBN: 978-1-62708-231-0
... of a hydraulic cylinder driven off the PTO of the truck. The wheel/axle set was rigidly fixed into an up or down position by the use of locking pins. It was assumed by the manufacturer that there would be no load on the cylinder once the wheel/axle set was in its locked position. However, as the cylinder pivoted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001721
EISBN: 978-1-62708-225-9
...Abstract Abstract Diagnosis of environmentally induced failures is greatly facilitated by metallographic analysis. As an example, a failure analysis of ASTM A574 material grade bolts is presented. The bolts served as bonnet screws in underground valves and failed due to stress-corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001558
EISBN: 978-1-62708-217-4
...Abstract Abstract A liquid hydrogen main fuel control valve for a rocket engine failed by fracture of the Ti-5Al-2.5Sn body during the last of a series of static engine test firings. Fractographic, metallurgical, and stress analyses determined that a combination of fatigue and unexpected...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003503
EISBN: 978-1-62708-180-1
...FMEA analysis of the stop valve for a hot water heater Table 1 FMEA analysis of the stop valve for a hot water heater Failure mode Effect Local System 1. Fails closed Burner off No hot water 2. Fails open Burner will not shut off Overheats, release valve releases pressure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
... for that support and for the encouragement of Dr. J. Stringer, the EPRI project manager. Cavity formation and collapse in liquids have been studied extensively over the years ( Ref 5 , 6 ). Machines and components that suffer cavitation damage include hydraulic pumps, valves, hydroturbine runners and guide...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001812
EISBN: 978-1-62708-241-9
...Abstract Abstract Several cases of embrittlement failure are analyzed, including liquid-metal embrittlement (LME) of an aluminum alloy pipe in a natural gas plant, solid metal-induced embrittlement (SMIE) of a brass valve in an aircraft engine oil cooler, LME of a cadmium-plated steel screw...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... Copper alloy C70600 tube from a hydraulic-oil cooler. The cooler failed from crevice corrosion caused by dirt particles in river water that was used as a coolant. (a) Inner surface of hydraulic-oil cooler tube containing a hole (arrow A) and nodules (one of which is indicated by arrow B) formed from...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
..., on ship propellers, valves, heat-exchanger tubes, and other hydraulic structures in contact with high-velocity liquids subjected to pressure changes. This type of wear also has been observed in mechanical devices such as plain bearings, seals, and orifices in which fluid goes through severe restrictions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001682
EISBN: 978-1-62708-229-7
..., is fabricated from austenitic stainless steel and contains piping, valves, a main pump, two heat exchangers, and expansion joints. The heat generated during nuclear operations is transferred from the heavy water to the secondary cooling water system through the heat exchangers. The secondary cooling water...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
.... Byrnes R.T. and Lynch S.P. , An Unusual Failure of a Nickel-Aluminium Bronze (NAB) Hydraulic Valve , Eng. Fail. Anal. , Vol 49 , 2015 , p 122 – 136 10.1016/j.engfailanal.2014.11.009 18. Gerberich W.W. , Microstructure and Fracture , Mechanical Testing , Vol 8 , Metals...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001818
EISBN: 978-1-62708-180-1
... 5 … 4 … 7 2 … … 2 7 5 1 … 31 1 1 Piping 10 2 1 3 1 5 18 1 … 2 10 7 15 4 41 1 … Safety valves … … … 1 … … 2 … … … … 3 … … 3 1 1 Miscellaneous … 2 4 7 … 4 166 1 2 5 4 9 12 … 232 5 4 1982 Shell 4 17 29 13 1 3 34...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... and industries that have experienced SCC failures include (this list is not exhaustive): Aerospace: Aluminum alloys in structural aircraft components such as landing gear and wing components, stainless steel tubing used as part of the hydraulic or fuel systems, high-strength low-alloy steel...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... be considered by some to be an exercise in semantics, a clear understanding of each piece of the situation associated with a failure greatly enhances the ability to understand causes and mitigating options and to specify appropriate corrective action. Consider the example of a butterfly valve that fails...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... greatly enhances the ability to understand causes and mitigating options and to specify appropriate corrective actions. Consider the example of a butterfly valve that fails in service in a cooling water system at a manufacturing facility ( Table 1 ). Recognizing the indicators, causes, mechanisms...