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Valves and Valves and AppurtenancesAppurtenances

Types of ValvesTypes of Valves

Air ValvesAir Valves Control ValvesControl Valves Pressure Relief ValvesPressure Relief Valves Pressure Reducing ValvesPressure Reducing Valves

Air ValvesAir Valves

Air valves are needed to control air Air valves are needed to control air in and out of pipe lines. in and out of pipe lines.

Types of Air ValvesTypes of Air Valves

Air release valve Air release valve Vacuum relief valveVacuum relief valve Air and vacuum valveAir and vacuum valve Combination air and vacuum Combination air and vacuum

relief valverelief valve

Air Release ValveAir Release Valve

A small orifice, A small orifice, continuous acting continuous acting valve for air valve for air release only.release only.

Used at closed Used at closed summits to summits to prevent formation prevent formation of air pockets.of air pockets.

Vacuum Relief ValveVacuum Relief Valve

A large orifice valve for vacuum A large orifice valve for vacuum relief only.relief only.

Air and Vacuum ValvesAir and Vacuum Valves Valves with large orifices Valves with large orifices

which allow air to exhaust which allow air to exhaust from the pipeline during from the pipeline during filling (not during operation) filling (not during operation) and allow air to enter the and allow air to enter the pipeline during emptying.pipeline during emptying.

Generally used at either Generally used at either upper or lower ends of upper or lower ends of pipeline.pipeline.

Slide GateSlide Gate

Used to let water Used to let water into gravity pipeline, into gravity pipeline, usually from usually from irrigation canal.irrigation canal.

Control mechanism Control mechanism is disk or plate is disk or plate sliding over pipe sliding over pipe opening.opening.

Check ValvesCheck Valves

In-line back flow In-line back flow prevention valve.prevention valve.

Generally used to Generally used to prevent surge at prevent surge at pumps and to pumps and to maintain water maintain water column in pipelines.column in pipelines.

Swing check

Double swing check

Rubber flapper check

Check Valves (cont.)Check Valves (cont.)

Slanting disk check

Silent check (center guided)

Automatic control check

Butterfly ValveButterfly Valve

In-line distribution In-line distribution valvevalve

Control mechanism is Control mechanism is a rotating disk inside a rotating disk inside of valve housing.of valve housing.

Ball ValveBall Valve

In-line distribution In-line distribution valvevalve

Control mechanism Control mechanism is a rotating hollow is a rotating hollow ball inside of valve ball inside of valve housing.housing.

Gate ValveGate Valve

In-line distribution In-line distribution valvevalve

Control mechanism Control mechanism is a sliding plate is a sliding plate inside of valve inside of valve housing.housing.

Globe ValveGlobe Valve

In-line distribution In-line distribution valvevalve

Control mechanism Control mechanism is plunger inside of is plunger inside of valve housing.valve housing.

Alfalfa ValveAlfalfa Valve

Outlet distribution Outlet distribution valvevalve

Control mechanism Control mechanism is a threaded plate is a threaded plate or cap on outside of or cap on outside of valve body.valve body.

Requires hydrant to Requires hydrant to open and close.open and close.

Alfalfa Valve (cont.)Alfalfa Valve (cont.)

Pressure Relief ValvesPressure Relief Valves

A valve used to A valve used to relieve excess relieve excess pressure that pressure that develops in the develops in the pipeline.pipeline.

Flow MeterFlow Meter

In-line device used to In-line device used to measure flow.measure flow.

In NRCS we generally In NRCS we generally require meters that give require meters that give both instantaneous both instantaneous flow rates and flow rates and cumulative volumes.cumulative volumes.

Air Vent AssemblyAir Vent Assembly

Used at at high points to provide Used at at high points to provide combination air and vacuum reliefcombination air and vacuum relief

Outlet of vent must be located Outlet of vent must be located above the hydraulic grade line for above the hydraulic grade line for allall flows. flows.

Air Vent Assembly (cont.)Air Vent Assembly (cont.)

Riser AssemblyRiser Assembly Pipe attached to underground pipeline to deliver Pipe attached to underground pipeline to deliver

water to surface outlets or system valves.water to surface outlets or system valves. A chamber may be required at base for certain A chamber may be required at base for certain

installations.installations.

Riser Assembly (cont.)Riser Assembly (cont.)

Drain AssemblyDrain Assembly

Valve and pipe assembly used to Valve and pipe assembly used to empty a pipeline.empty a pipeline.

Generally either gravity or pump out Generally either gravity or pump out configurations are used.configurations are used.

Drain Assembly (cont.)Drain Assembly (cont.)

Thrust ControlThrust Control

Anchors or thrust blocks used to Anchors or thrust blocks used to resist axial thrust in the pipeline at resist axial thrust in the pipeline at abrupt changes in pipe grade, at abrupt changes in pipe grade, at changes in pipe alignment, at changes in pipe alignment, at reductions in pipe diameter, at reductions in pipe diameter, at points of divergence, and at ends points of divergence, and at ends of line.of line.

Thrust Control (cont.)Thrust Control (cont.)

NPRC Project NPRC Project

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

10” Pressure Reducing Valve

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

NPRC Project (cont.) NPRC Project (cont.)

Final Installation Final Installation