A valve, which prevents or restricts airflow in a certain direction or directions under specific circuit conditions.

A device that prevents a reverse water flow in pipes and sprinkler heads. Commonly used in sprinkler heads to prevent low head drainage.

valve that lets water flow in one direction only

Inline device that allows gas or water, depending on the type of valve, to flow in one direction

(swing check valve) — A device used in a suction or discharge line that allows flow in only one direction to prevent reverse flow, thus isolating the material being pumped.

A plumbing fitting designed to allow water to flow in one direction only.

a device used to stop the flow of media in one directions while allowing flow in the opposite direction

a mechanical device normally applied to a piping system which allows fluid to flow in only one direction

a mechanical device that allows process fluid or gas to flow in only one direction preventing fluid or gas backflow

an automatic valve that opens to the pressure of water on one side but closes tightly when pressure is applied to the opposite end Fig

a one-way valve for fluid flow

a one-way valve that prevents water from flowing backward in the pipe

a one-way valve that prevents water from leaving the tank when the power is turned off

a small device that when attached to the airline tubing prevents any water from back-flowing out of the aquarium into your air pump in the event of an power failure

a valve that has a disc that is in the free hanging closed position

a valve that is drip-tight in the normal direction of flow when the inlet pressure is one psi and the outlet pressure is zero

a valve that is Our system is not a water softener, but rather an electronic water all appliances that are treated by the NoKalk system

a valve which permits water to flow in one direction only.

A valve that permits fluid or vacuum flow in one direction but prevents it in the opposite direction.

A valve which permits flow in only one direction.

n: a valve allowing flow in one direction only.

A valve that allows water to flow one way but not the other.

A one-way valve that only allows water to flow in one direction. Prevents backflow in a filter system.

A one-directional valve which is opened by the fluid flow in one direction and closed automatically when the flow stops or is reversed.

Any one of several types of valves that allows flow in only one direction.

A valve that permits flow of liquid through a hose or pipe in one direction but prevents a return flow. Uses include the prevention of backflow on uphill hose lays, loss of prime with centrifugal pumps and chemical contamination in fire chemical mixing systems.

A one way gate in a pipe that allows flow of water or air in one direction.

A one-way (nonreturn) valve whereby fluids pass in one direction only; the valve closes when the pressure causing flow stops or back pressure closes the valve, See also ball valve; gate valve; nonrising-stem valve; plug valve; pressure-control valve; pressure-reducing valve pressure-regulating valve; rising-stem valve, thermal-relief valve.

A byelaw requirement, this valve ensures one way flow from your softener.

A type of backflow preventer installed in a pipe that allows water to flow in only one direction.

A type of backflow preventer that is installed in a pipe so that water flows in only one direction.

A valve that allows one-way flow of sewage.

A two-way directional valve that allows free flow in one direction and blocks flow in the other direction. Check valves can act as either directional or pressure control apparatuses. ( http://www.check-valves.net)

( http://www.check-valves.net) – An apparatus in a discharge or suction line that permits flow in only one direction so as to prevent reverse flow and isolate the material being pumped.

A safety valve that prevents fuel spills if the car turns over.

A type of non-return valve used as part of the normal real ale dispense installation.

A device used to keep the flow of either air or water moving in one intended direction.

A flow control device that permits flow in one direction and prevents flow in the opposite direction.

Allows substance (such as gas, liquid or solids) to flow in only one direction. Once passed the check valve the substance cannot flow back through check valve.

A check valve is a one-way valve that allows water to flow only in one direction, thus preventing backflow in a filter system.

A one way flow device.

A mechanical device in a pipe that permits the flow of water in one direction only. Also called a one-way valve or a non-return valve.

A valve designed to prevent reversal of flow. Flow in one direction only is permitted.

A device inserted into a moving liquid stream that allows flow of the stream in only one direction; often built into the HPLC pump.

A one-way valve installed to prevent reverse flow of water in a piping system.

Any one-way valve installed to permit the flow of air, fuel or vacuum in one direction only.

A valve which will allow water to pass in one direction but will close and prevent flow (backflow) in the opposite direction.

See backflow preventer

An automatic valve that permits the flow of water in a given direction.

Valve permitting flow in a single direction.

Automatic valve that allows air flow in one direction only; placed at air reservoir inlet to prevent loss of air from reservoir in the event of leakage in line leading to inlet.

A check valve is a mechanical device, a valve, that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications.