The pressure within a system caused by fluid friction or an induced resistance to flow through the system. Most process facilities require a minimum system pressure to operate efficiently. The necessary back-pressure is often created and controlled by a valve that is set to operate under the desired range of conditions.

Propagation of network congestion information upstream through an internetwork.

The pressure encountered on the return side of a system.

Pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.

The applied hydraulic pressure used to restrict the shot size formation. Applied to the back of a melt accumulator or reciprocating screw. Used to control screw drift, mixing, and shot size adjustment [..]

Pressure that resists the flow of fluid in a piping system.

Pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.

Resistance to air flow; usually stated in inches H2O or PSI.

The level of pressure on the return or downstream side of a device or system.

A restriction in the flow of exhaust gasses caused by the exhaust system or by a turbocharger but is ultimately required of efficient scavenging of the exhaust gasses in the combustion chamber.

A pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.

A pressure that can cause water to backflow into the water supply when a user's waste water system is at a higher pressure than the public system.

A pressure that can cause water to backflow into the water supply when a user’s water system is at a higher pressure than the public water system.

A pressure that can cause water to backflow into the water supply when a user's water system is at a higher pressure than the public water system.

The resistance to the flow of exhaust gases through the exhaust system. By rerouting the exhaust gases for noise suppression, a muffler causes back pressure, but a straight pipe alone causes only mini [..]

Loose terminology for suction pressure of refrigeration vapor in a system.

Pressure in low side of refrigerating system; also called suction pressure or low side pressure.

Pressure against the flow of liquids or air due to various imposed constrictions; e.g., air pressure working against a fan (air mover) within an air stream that is being compressed, as under a carpet [..]

The pressure exerted on the downstream side of a valve.

The pressure resulting from restriction of full natural flow of oil or gas.

Pressure against which a fluid is flowing. May be composed of friction in pipes, restrictions in pipes, valves, pressure in vessels to which fluid is flowing, hydrostatic head, or other resistance to [..]

Pressure in low side of refrigerating system; also called suction pressure or low-side pressure.