Answer Posted / www.islamqa.com

We can devide valve types by 3 considerations:

# valve types with considering valve function- so we have:
on/off valve
control valve( or called throttling or modulating valve )
safety/relief valve
check valve

# valve types with considering stem motion- so we have:
linear motion which have: globe, gate, bench valve
rotary motion which have: ball, butterfly, disk valve

# valve types with considering actuator type- so we have:
manual valve
MOV (Motorized Operating Valve)
solenoid valve
pneumatic valve: diaphragm, piston valve
hydrolic valve: piston valve

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
CELL.: 00 2 0121367310

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