Презентация на тему Pipeline valve types and classification

valves

задвижки, клапаны

Valve is an integral component used for controlling

& regulating flow of liquids or gases to maintain the process parameters such as flow, pressure etc.

function or purpose of application

2. the closure member or

mechanical motion

and stop flow of fluids
• To regulate, throttle and control

fluid flow or pressure
• To prevent back-flow
• To relieve excess pressure / vacuum
Thus, the following types are distinguished:
•Shut-off Valves (Block valves/ shut-down)
•Non-return Valves (back-pressure valve)
•Control Valves
•Safety Valves (pressure-relief valve, pressure safety valve, pressure/vacuum-relief valve, emergency relief valve)

Motion Valves. The Valves in which the closure member,

as in gate, globe, diaphragm, pinch,, moves in a straight line to allow, stop, or throttle the flow.
• Rotary Motion Valves. When the Valve-closure member travels along an angular or circular path, as in butterfly, ball, plug, eccentric- and Swing Check Valves, the Valves are called rotary motion Valves.
• Quarter Turn Valves. Some rotary motion Valves require approximately a quarter turn, 0 through 90°, motion of the stem to go to fully open from a fully closed position or vice versa.

regulator stations
Meter runs
Launcher and receiver stations
Breakout tankage
Distribution manifolds

(to insure leak-tight performance)
Can be equipped with motor operator

valve.
Branch or lateral valve:
Leak tight
Block-and-bleed design
Full-port design is not necessary

by inlet and outlet valves.
Pump station valves:
Suction sides of

the station and discharge side to the pipeline, so there are suction valves and discharge valves.
Pipeline control valves:
Work in concert with centrifugal pumps
Usually vee-ball design
Controller presence

installation.
Besides, block valves should be installed :
- on

both banks of the river crossing in a case of two or three lines;
- in river crossing in a case of a line, however, in this very case the place of block valve installation is defined depending on the type of landscape close to the crossing;
- on both banks of the III type-bog which expends more than 500 m;
- at the beginning of every pipeline branch at a distance not less than 15 m;