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NPEG. Valves and Appurtenances. Types of Valves. Air Valves Control Valves Pressure Relief Valves Pressure Reducing Valves. Air Valves. Air valves are needed to control air in and out of pipe lines. . Types of Air Valves. Air release valve Vacuum relief valve Air and vacuum valve

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Valves and Appurtenances


Types of valves

Types of Valves

  • Air Valves

  • Control Valves

  • Pressure Relief Valves

  • Pressure Reducing Valves


Air valves

Air Valves

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


Types of air valves

Types of Air Valves

  • Air release valve

  • Vacuum relief valve

  • Air and vacuum valve

  • Combination air and vacuum relief valve


Air release valve

Air Release Valve

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

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


Vacuum relief valve

Vacuum Relief Valve

  • A large orifice valve for vacuum relief only.


Air and vacuum valves

Air and Vacuum Valves

  • Valves with large orifices which allow air to exhaust from the pipeline during filling (not during operation) and allow air to enter the pipeline during emptying.

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


Slide gate

Slide Gate

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

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


Check valves

Check Valves

Swing check

  • In-line back flow prevention valve.

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

Double swing check

Rubber flapper check


Check valves cont

Check Valves (cont.)

Slanting disk check

Automatic control check

Silent check (center guided)


Butterfly valve

Butterfly Valve

  • In-line distribution valve

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


Ball valve

Ball Valve

  • In-line distribution valve

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


Gate valve

Gate Valve

  • In-line distribution valve

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


Globe valve

Globe Valve

  • In-line distribution valve

  • Control mechanism is plunger inside of valve housing.


Alfalfa valve

Alfalfa Valve

  • Outlet distribution valve

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

  • Requires hydrant to open and close.


Alfalfa valve cont

Alfalfa Valve (cont.)


Pressure relief valves

Pressure Relief Valves

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


Flow meter

Flow Meter

  • In-line device used to measure flow.

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


Air vent assembly

Air Vent Assembly

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

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


Air vent assembly cont

Air Vent Assembly (cont.)


Riser assembly

Riser Assembly

  • Pipe attached to underground pipeline to deliver water to surface outlets or system valves.

  • A chamber may be required at base for certain installations.


Riser assembly cont

Riser Assembly (cont.)


Drain assembly

Drain Assembly

  • Valve and pipe assembly used to empty a pipeline.

  • Generally either gravity or pump out configurations are used.


Drain assembly cont

Drain Assembly (cont.)


Thrust control

Thrust Control

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


Thrust control cont

Thrust Control (cont.)


Nprc project

NPRC Project


Nprc project cont

NPRC Project (cont.)


Nprc project cont1

NPRC Project (cont.)


Nprc project cont2

NPRC Project (cont.)


Nprc project cont3

NPRC Project (cont.)


Nprc project cont4

NPRC Project (cont.)

10” Pressure Reducing Valve


Nprc project cont5

NPRC Project (cont.)


Nprc project cont6

NPRC Project (cont.)


Nprc project cont7

NPRC Project (cont.)


Final installation

Final Installation


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