BLEEDER: Describes the valve or screw used to vent the air out of a liquid-filled system.
BRAKE PROPORTIONING VALVE: Describes the valve whose role is to limit braking force to the front or rear wheels, usually as a function of pedal effort or line pressure, to prevent wheel locking and provide the most effective braking.
BYPASS VALVE (BPV): Describes a valve that can open and allow fluid or gas to pass through in other than its normal channel.
CHECK VALVE: Describes a one-way valve that opens to permit the passage of fluid or air in one direction and closes to prevent progression in the opposite direction.
CHECK BALL: Describes a small ball similar to a ball bearing) found in a check valve to halt the progress of fluid in a specific direction.
COMPENSATOR VALVE: Describes the valve found in automatic transmissions designed to increase the pressure on the brake band during heavy acceleration.
CONTROL VALVE: Describes a type of valve that either regulates or operates a hydraulic or vacuum control system.
CONTROL VALVE ASSEMBLY: Describes a type of casting located in the sump of the automatic transmission that houses most of the valves for the hydraulic control system.
DECOMPRESSOR VALVE: Describes a manually operated valve used to release compression in a cylinder by allowing air to escape, clearing the way for enabling manual ignition of an engine that has been out of service.
DELAY VALVE: Describes a valve used in a vacuum or hydraulic system in which the valve's opening or closing is delayed.
DISCHARGE PRESSURE: Denotes the pressure levels exerted in a liquid being pumped, expressed in PSI.
DISC VALVE: Describes a type of rotary valve that allows fluid flow through an arc-shaped slot.
DISTANCE PIECE: Describes the collar or spacer placed between two parts to keep them the correct distance apart.
DISTRIBUTION TUBES: Describes the tubes used in the engine cooling area to guide and direct coolant flow to vital areas.
DIVERTER VALVE: Describes a valve that adds a pre-determined amount of air to the rich air-fuel mixture entering the intake manifold during deceleration.
DUMP VALVE: Describes a type of valve used to relieve internal pressure between the turbocharger and the carburettor in some systems.
NEEDLE VALVE: Describes the valve found in a carburettor that controls the levels of gasoline flowing from the pump to the float chamber.
NEGATIVE TRANSDUCER EGR VALVE: Describes a valve fitted on engines with relatively low back pressure to help them provide the desired opening point and exhaust gas recycling rate
ORIFICE: Describes the valve controlled final opening through which fuel and gases can flow.
OVERHEAD VALVES (OHV): Describes a situation in a four-stroke engine where the intake and exhaust poppet valves are located in the cylinder head and not at the side of the cylinder.
OVERRUN CONTROL VALVE: Describes a valve found in that crossover pipe between the compressor suction and discharge sides of some turbocharger systems, maintaining turbo speed and minimising turbo lag in the event of an overrun.
PCV VALVE (PCVV): Describes a part found in the positive crankcase ventilation system, which reroutes crankcase blowby to the intake manifold and returns it to the engine, to be recycled in the cylinders as part of the fuel-air mixture.
PETCOCK: Describes a small valve or tap used to control the flow of liquid.
POP-OFF VALVE: Describes a one-way valve that opens above a certain set pressure and will relieve excessive internal pressure build-up.
POPPET VALVE: Describes a valve structure that consists of a circular head that has an elongated stem attached in the centre, in a mushroom shape; the poppet valve is designed to open and close a circular opening.
ROTARY VALVE: Describes a cylindrically shaped engine component that forms a significant part of a rotating assembly.
SAFETY VALVE: Describes a type of valve designed to open and relieve pressure within a container when the internal pressure exceeds a certain level.
SIDE VALVE: Describes valves positioned on the side of a cylinder.
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