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check valves

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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 More
Image
Published: 01 August 2012
Fig. 12.5 Inline check valve: (a) photo, (b) schematic, and (c) International Organization for Standardization symbol. Source: Ref 12.16 More
Book Chapter

By Eren Billur
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400181
EISBN: 978-1-62708-316-4
... that the fluid is flowing only along one direction, is called “check valve” (also known as a nonreturn valve ). In a typical check valve, a metal ball is seated on a tapered channel ( Fig. 12.5b ) and is pushed by a compressed spring. When the fluid flows in the freeflow direction, the fluid pushes the spring...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.tb.sfa.t52780131
EISBN: 978-1-62708-268-6
... Abstract Leaks can occur as the result of several failure causes. This chapter reviews the causes, features, and impact of various types of leaks, namely gasket leaks, O-ring leaks, bond-joint leaks, weld leaks, polyvinyl chloride leaks, valve leaks, and structural leaks. bond-joint leaks...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400203
EISBN: 978-1-62708-316-4
... presses. The hydraulic cushion cylinder is connected to the accumulator by a servo valve, a check valve, and a relief valve. During forming, as the cylinder is moving downward, the servo valve controls the fluid flow from the hydraulic cylinder to the accumulator, thereby maintaining the desired pressure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270084
EISBN: 978-1-62708-301-0
... Fig. CH10.2 Separation of the hub A close-up view of the fracture surface of the hub is shown in Fig. CH10.3 . Two of the three tie-rods can be seen with the nuts intact. The bolt hole closer to the air valve where the tie-rod is missing is elongated inward, toward the axle. This indicates...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410103
EISBN: 978-1-62708-280-8
... into the critical surfaces to avoid the potential for metal flow lines. While choosing gating at parting plane, avoid gate metal impingement on the die steel or a metal core. This is to minimize heat checking and poor metal flow pattern. Providing adequate parting plane periphery, to allow space for the gates...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370095
EISBN: 978-1-62708-447-5
... castings; degating or removal of runners, gates, and feeders; and flash removal and automation. The chapter also presents the objectives of heat treatment and discusses its processes. The chapter describes product quality control. Quality checks are grouped into three categories: material checks, product...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900053
EISBN: 978-1-62708-350-8
... if the nitride bath is gas fired. Make sure that the burner train linkages are secure and that modulating valves (if fitted) are operational. Determining that the burner ignition system is operational and that the flame rod is clean Checking that no traces of nitriding salt are present on the cleanout port...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.t59370187
EISBN: 978-1-62708-447-5
... Differential carriers … X Differential carriers in GPM and (high pressure) die casting in use Truck transmission housings X … … Intake manifolds … X Also produced in GPM and core sand molds Turbocharger pump bodies … X Brake calipers X X Produced in GPM and SPM also Valve bodies...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900039
EISBN: 978-1-62708-350-8
.... If there are intermediate valves on the line and it is a key valve, make sure that the key is chained to the shutoff valve. If the process uses only the dissociation burette measuring system for process gas control, check city regulations regarding the disposal of water contaminated by ammonia. Do not put the ammonia...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130395
EISBN: 978-1-62708-284-6
.... This characteristic of steam-treated PM products has enabled its widespread use in pistons and valve plates for compressors. The sealing of pores also helps the PM part to be amenable to corrosion-preventive coatings (galvanic as well as barrier coatings) and, in some cases, to gas and salt bath nitriding...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630237
EISBN: 978-1-62708-270-9
..., and combinations of these as modified by environment. Elevated-temperature problems are real concerns in industrial applications such as boilers, steam and gas turbine parts, containers in contact with molten metal, heat-treating furnaces and equipment, cement mills, incinerators, exhaust valves and manifolds...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050293
EISBN: 978-1-62708-311-9
... Clean heat exchanger on PM program Temperature controls not working Repair. Have emergency bypass available Temperature control valve not working Repair. Have emergency bypass available Individual line overheating in power supply or heat station Clogged water line Clean. Check for proper...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ceeg.9781627084475
EISBN: 978-1-62708-447-5
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900185
EISBN: 978-1-62708-350-8
... Each week, check the vacuum pump oil in terms of level and condition. Ensure that the vacuum pipe connecting the vessel to the pump is fitted with a valve or trap to prevent the possibility of backstreaming of vacuum pump oil when a pressure differential occurs between the process chamber...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250077
EISBN: 978-1-62708-345-4
... and temperature uniformity; and the metering zone, generally of constant, shallow-flight depth, provides the final shear heating and mixing of the melt. After the melt passes through the metering section and a check valve at the end of the screw, it joins the melt pool in front of the screw. As the volume of melt...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200115
EISBN: 978-1-62708-354-6
..., it is imperative that for each casting design a complete layout of the sample casting should be made. For simple configurations a rule might be used to check dimensions and machine stock. For more complex parts, it may be necessary for the casting to be checked more completely; calling for target points...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410029
EISBN: 978-1-62708-280-8
..., motorcycle engine blocks and heads, larger valves, engine brackets, valve covers, impellers, marine engine components, small aircraft gearboxes, fighter aircraft speed brake wing sections, and automotive prototypes. 4.3 Vacuum Molding Process Large-sized castings (e.g., 1200 to 1500 mm or 45 to 60...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2010
DOI: 10.31399/asm.tb.hss.t52790059
EISBN: 978-1-62708-356-0
... Brearley’s cutlery steel was being exclusively used for airplane exhaust valves and sold under the brand name Firth’s Aeroplane Steel. The heat treatment was critical for this application as well as for cutlery. Paper on Stellite and Stainless Steel by Elwood Haynes...