Answer / oscar b. ano-os jr.

In general, valves can be categorized only into two types,
STOP VALVES AND CHECK VALVES... Stop valves are used to
control process flow (i.e 25%, 50%, 75% and so on) while
check valves are used to restrict the flow of process in
only one direction.

Types of Stop Valves are Globe Valves, Butterfly Valves,
Ball Valves, Saunders Valve and other types while the most
coomon tyoe of Check Valve is the Relief Valve used to
deppresurize tanks and vessels...

Answer / 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

Can anybody tell me application of PLC,DCS,SCADA.

3 Answers   Reliance,

---

How to calculate flow of air bubbler type level transmiter  According hight and density 

2 Answers   Qatar Petroleums, RKS,

---

Which language of programing is popular? how can i learn it ?

0 Answers  

---

components of control circuit belongs to control valve

0 Answers   KOC,

---

How Control valve sizing is done?

3 Answers  

---

What is purpose of shield wire?

1 Answers   IFFCO,

---

what is written on orifice plate?

4 Answers  

---

why 4ma show higher zero ? i have transmiter flow renge 0-1000 m3/h but 4 ma show in monitoring 200 m3/h and 20 ma show 1000 m3/h i want when 4ma show 0 m3/h and 20ma 1000m3/h

3 Answers  

---

Please anyone answer my question, what is the difference between single acting and double acting control valve, in what condition we better choose single acting rather than double acting

2 Answers  

---

please tell me what is a light up procedure of Cfbc boiler and what it's axuillaries of cfbc boiler?

0 Answers   Wartsila,

---

What is a flow meter?

2 Answers  

---

without color coding, without nameplate, without multimeter how can you find the type of thermocouple???

1 Answers   Sabic,

---