( Some valves use direct heating, in which a tungsten filament acts as both heater and cathode.

Some 19th-century or earlier experimental engines used external flames, exposed by valves, for ignition, but this becomes less attractive with increasing compression.

Some common operational problems are intrusion of air into the drive pipe, blockage of the intake or valves with debris, knocking due to having too little air in the pressure vessel, freezing in winter and bursting of the delivery pipe if output is blocked or pressure not relieved.

Some valves have neither handle nor actuator because they automatically control themselves from inside ; for example, check valves and relief valves may have neither.

Some valves have no external control and do not need a stem as in most check valves.

Some valves are made to be operated in a gradual change between two or more positions.

Some valves rated at very high pressures are available.

Some models benefit from variable camshaft timing, and multiple valves per cylinder.

Some of the specimens, such as the Tai Chi Man, demonstrate interventions, and include prosthetics such as artificial hip joints or heart valves.

Some operational problems were reported due to the high viscosity of vegetable oils compared to petroleum diesel fuel, which results in poor atomization of the fuel in the fuel spray and often leads to deposits and coking of the injectors, combustion chamber and valves.

Some bass-baritones were equipped with full-tone rotary valves to F in order for some of the hornline to be able to achieve the desired Bugle Low A, and in the mid-1960s a bass-baritone rotor to E was briefly offered.

Some patients with prosthetic heart valves however need antibiotic prophylaxis for dental surgery because bacteremia might lead to endocarditis ( infection causing inflammation of the interior lining of the heart ).

Some types of irrigation sprinklers and drip irrigation emitters have small check valves built into them to keep the lines from draining when the system is shut off.

Some of the early CVCC engines had a problem with the auxiliary valves retaining collars vibrating loose.

Some airless pumps have a diaphragm instead of a piston, but both types have inlet and outlet valves.

Some GCs also include valves which can change the route of sample and carrier flow.

Some ball valves are equipped with an actuator that may be pneumatically or motor operated.

Some governments require the use of two chemigation valves installed in series if hazardous chemicals are to be injected.

Some of the less directly visible differences were poorly shaped ports in the earlier versions, a slow burning combustion chamber with heavily shrouded valves, less aggressive camshaft profiles, ports of a small cross sectional area, a very restrictive intake manifold with long runners joined to a small displacement plenum and other changes.

Some blowoff valves are sold with a trumpet-shaped exit that intentionally amplifies the sound.

Some SOHC multi-valve engines ( such as the Mazda B8-ME ) use a single fork-shaped rocker arm to drive two valves ( generally the exhaust valves ) so that fewer cam lobes will be needed in order to reduce manufacturing costs.

Some of us might be inclined to argue, in fact, that an independence of mind and action and an intolerance of regimentation, either mental or physical, are particularly Southern traits.

Some years ago Julian Huxley proposed to an audience made up of members of the British Association for the Advancement of Science that `` man's supernormal or extra-sensory faculties are ( now ) in the same case as were his mathematical faculties during the ice age ''.

Some are fishing, some driving the team, and many are sitting indolently on the banks of the river.

Some historians have found his point of view not to their taste, others have complained that he makes the Tory tradition appear `` contemptible rather than intelligible '', while a sympathetic critic has remarked that the `` intricate interplay of social dynamics and political activity of which, at times, politicians are the ignorant marionettes is not a field for the exercise of his talents ''.

Some of the marble busts in the park are of young Englishmen who fought and died for Garibaldi.

Some accounts are quite lengthy but Florida's is the shortest of all, requiring only four paragraphs.

Some plant-location specialists take these signs to mean St. Louis county doesn't want industry, and so they avoid the area, and more jobs are lost.

Some fiscal changes are important.

Some brilliant rookies nailed them down, so that this spring just two spots, left and right field, are really up for grabs.

Some of the stumps are as much as three feet long, but most of them have been flattened by the pressure of the overlying sediments.

Some privately held inholdings are a source of direct damage to these Federal lands.

Some 45 frequencies are assigned for use primarily by dominant Class 1, -- A or Class 1, -- B clear-channel stations, designed to operate with adequate power and to provide service -- both groundwave and ( at night ) skywave -- over large areas and at great distances, being protected against interference to the degree necessary to achieve this objective.

Some deductions are subtracted from Gross Income to determine Adjusted Gross Income.

Some renditions are of symphonic dimensions, with the contrabass given free rein.

Some of them are obvious, such as the fact that we associate recorded and live music with our responses and behavior in different types of environments and social settings.

Some tasty frank toppings are chili con carne, Coney Island sauce and savory sauerkraut.

Some general things to look for in a site, if you haven't already bought one, are accessibility, water drainage, and orientation.

Some distribution costs are kept up by competitive pressure, some by the fact that the customers have come to expect certain niceties and flourishes.

Some of these temperatures are plotted in figure 4.

( Some suspensions break up before they are near to the direction of shear, and some become asymptotic to it without breakup.

Some experiments are composed of repetitions of independent trials, each with two possible outcomes.

Some of these speculations may have some merit, others are somewhat ambiguous.

Some phonetic features, for example glottal catch or murmur, are sometimes to be assigned to segmental phonemics and sometimes to accentual systems.

Some are failing to achieve as much as their ability would permit ; ;