Globe Valve

Start, stop and throttle

Less leakage than gate valves

Higher Head Loss

Linear Movement

Ball Valve

Much like a plug valve

Stop and start

Quick acting

Can be used for throttling but is poor

and rapidly erodes the disk

Rotational Movement

Plug Valve

Like a ball valve

Start and stop

Quick acting

Throttling is hard on the disc.

Rotational movement

Diaphram and Pinch valves

Used to start, stop and throttle

Used for slurries or where corrosion may be

a factor

Linear Movement

Butterfly Valve

Stop, start and throttle

Rotational Movement

Large valve applications

Save: weight, cost and space

Needle Valves

Fine adjustments

used as component parts for more

complicated valves

often used on reducing valves

Check Valves

Prevent reversal of fluid

Swing:tilting disk with adjustable stop

Lift check: similar in shape to a globe valve

Stop: operates like a lift check unless manually

closed, then blocks flow in both directions

Safety Valve

Prevents overpressurization

Rapidly opens

Surface area increases upon activation causing

the need to have pressure drop below the

activation level which is called blowdown

(P-set minus P-reset)*100% /P-set=

% blowdown

Gate Valve

Tight seal

Low loss of head when fully open

Start, stop but DO NOT THROTTLE

Most flow change is near shut off

Slide of linear motion

Relief Valves

Prevent overpressurization

Gradual opening

(P-full open minus P-setpoint)*100%/P-setpoint=

Accumulation %