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In oil and gas production a choke manifold is used to lower the pressure from the well head. It consist of a set of high pressure valves and at least two chokes. These chokes can be fixed or adjustable or a mix of both. The redundancy is needed so that if one choke has to be taken out of service, the flow can be directed through another one.
In internal combustion engines with carburetors, a choke valve or choke modifies the air pressure in the intake manifold, thereby altering the air–fuel ratio entering the engine. Choke valves are generally used in naturally aspirated engines to supply a richer fuel mixture when starting the engine.
If the fluid is a liquid, a different type of limiting condition (also known as choked flow) occurs when the venturi effect acting on the liquid flow through the restriction causes a decrease of the liquid pressure beyond the restriction to below that of the liquid's vapor pressure at the prevailing liquid temperature.
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The Ford variable venturi carburetor was replaced by a Weber 28/30 TLDM which used a manifold vacuum-actuated secondary choke instead of the more usual sequential linkage which opens the secondary butterfly at 3/4 to full throttle. The 1.4 L version is less responsive to power modification than other CVH engines, and some common tuning parts ...
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CHK – choke (a restriction in a flowline or a system, usually referring to a production choke during a test or the choke in the well control system) CHKSR – checkshot survey report; CHKSS – checkshot survey log; CHOPS – cold heavy oil production with sand; CHP – casing hanger pressure (pressure in an annulus as measured at the casing ...
The choke provision for the Quadrajet was initially in the form of an intake-mounted, heat sensitive spring, (divorced choke), often referred to as a heat riser. The spring connected to a rod that actuated the choke mechanism on the passenger's side of the carburetor, and relied on intake manifold's temperature.