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Types of Valves



Throttling Valves

  Types Advantages Disadvantages
1. Diaphragm valve The interior of this valve is very smooth,
and can be easily cleaned.
The valve leaks upon the failure of the
diaphragm.
2. Butterfly valve The rubber-lined valve is a
good, cheap valve for all types of low pressure, non-critical services. This valve can also
be lined with a resistant polymer for very corrosive service.
Rubber lined valve has pressure limitations.
3. Needle valve It gives good flow
control; It can have very high pressure ratings.
It causes a high pressure drop &
presents a greater risk of clogging due to entrained solids.
4. Pinch valve This valve can be tightly shut
off, and will even close when entrained solids
are present in the flowing fluid.
The pressure rating of this valve is
low. The compatibility of the
hose material with the process stream is critical.
5. Globe valve It can be used to modulate flow or
to stay partially open to impose a certain
pressure drop.
It passes flow in only one direction.
6. Stop check valve Besides throttling like a globe valve,
this valve also prevents reverse flow.
It’s design is more complex than
that of globe and check valves.
7. Angle valve Pressure drop is slightly less than a
conventional globe valve.
It complicates that piping layout.
8. Y-pattern globe valve It can throttle and is
often used in high pressure service.
It complicates the piping design.
Top
On – Off Valves2. On – Off Valves

Sr. No. Types Advantages Disadvantages
1. Ball valve Pressure drop is very
low; it is suitable for handling erosive fluids & slurries.
Fluids that set up or
polymerize could freeze the ball.
2. Plug valve Pressure drop is fairly
low; lubricated type is very good for slurry and catalyst service;
plastic-sleeved plug is used for highly corrosive services.
Lubricated plug valve should be
lubricated every time it is operated;
plastic valves have a limited operating temperature (400F)
3. Hydrant valve Useful in freezing climates. ————-
4. Gate valve Pressure drop is
low; this valve weighs and costs less than other comparable size valves.
It is almost completely incapable
of throttling.
5. Ram valve/
Displacement valve
It is very useful for taking accurate
samples of solid bearing streams.
These valves are custom designed
to some exact,
correct valve should be chosen for each application.
Top
Non – Return Valves

Sr. No. Types Advantages Disadvantages
1. Split disc-check valve It is generally the least expensive check
valve in medium to large sizes. Shutoff is somewhat better in this valve.
It is not suitable for large material.
2. Lift-check valve In small
sizes, it is also one of the cheapest check valve. In large sizes, it can be used in pulsating flows.
The pressure drop is fairly high.
3. Swing-check valve It will operate well whether installed
horizontally or vertically. The body can be equipped with drain or bypass taps.
It is large & heavy compared with
other types of such valves. This valve is not suitable for pulsating flows containing entrained material.
4. Tilting-disc-check valve The pressure drop is lower than that of the swing-check valve. IT is large & heavier than the
swing-check valve. An over-sized
valve is prone to flutter or slamming.
       


3. Non – Return
Valves