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Valves 
functions and types 
Shivaji Choudhury
Valves 
 Many different types of valves are 
used in a industrial plants to perform 
various functions. 
 Valves are use...
Types of Valves 
In general, valves may be categorized 
within the following four groups : 
1. Isolation Valves: 
2. Contr...
Valve functions 
And types 
Isolation 
Valve 
Control 
valve 
Check 
valve 
Pressure 
Relief valve 
Gate 
globe 
butterfly...
Isolation Valves 
 Used for on-off service (including 
throttled position) with local or 
remote actuation. Depending on ...
Isolation Valves 
 Isolation valves, both manual and power 
operated, are typically used to isolate a 
system component o...
Gate valve- isolation functions 
 A gate valve, also 
known as a sluice 
valve, is a valve that 
opens by lifting a round...
GLOBE VALVES—ISOLATION FUNCTION 
 Globe valves are normally 
metal or hard-seated, but 
they can be furnished with 
resil...
BUTTERFLY VALVES—ISOLATION 
FUNCTION 
Butterfly valves are 
high pressure 
recovery valves 
(also called high 
capacity an...
BALL VALVES—ISOLATION FUNCTION 
 Ball valves are quarter-turn 
valves, occupy less 
vertical space than rising 
stem valv...
PLUG VALVES- isolation functions 
 Like the ball valve, 
the plug valve is a 
quarter-turn valve. 
It uses a 
cylindrical...
DIAPHRAGM VALVES—ISOLATION 
FUNCTION 
 The diaphragm valve is 
comprised of a bonnet, 
body, and flexible-sealing 
member...
Control Valves 
 Used for modulating or throttling service. 
Their operation is automatic in response to 
continuous moni...
Control Valves 
 A modulating control 
valve is a device used 
to automatically 
throttle process fluids 
as required by ...
TOP GUIDED CONTROL VALVE 
Top-guided, single-ported 
valves may be 
used for tight shutoff 
applications; however, 
becaus...
CAGE GUIDED VALVES 
 Cage-guided valves 
have a cylindrical plug 
guided through a guide. 
 The increased guiding 
area ...
DOUBLE SEATED CONTROL VALVE 
 Double-seated control 
valves are used to a 
lot of industrial 
applications due to 
advant...
Pressure Relief Valves 
 Used to provide protection against 
excessive pressure. 
 The valve opens automatically when 
p...
Pressure relief valves
Check valves 
 Used to allow flow in the normal flow 
direction and to prevent flow in the 
opposite flow direction (reve...
Check Valves 
 Check valves are self-actuated valves whose functions 
include: 
 Prevention of reverse flow 
 Keeping l...
Swing Check Valves 
 Swing check valves are the 
most common type of check 
valve currently in plants due 
to their simpl...
Tilt Disc Check Valves 
 Tilt check valves differ from the swing check 
valves in that the hinge pin is located in the 
f...
Check valves 
 Tilt Disc Check 
Valves 
 Lift check valve
Valve End Connections 
Valves can be connected to pipes in 
several ways, including: 
 · Threads 
 · Welding 
 · Brazin...
Valve Symbols
THANKING YOU
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Valves

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Valves

  1. 1. Valves functions and types Shivaji Choudhury
  2. 2. Valves  Many different types of valves are used in a industrial plants to perform various functions.  Valves are used for on-off service, modulating/throttling service, to protect components against overpressure, and to prevent backflow from occurring.
  3. 3. Types of Valves In general, valves may be categorized within the following four groups : 1. Isolation Valves: 2. Control Valves: 3. Pressure Relief Valves: 4. Check valves
  4. 4. Valve functions And types Isolation Valve Control valve Check valve Pressure Relief valve Gate globe butterfly ball plug diaphragm globe butterfly Ball included Cam type Self contained regulators Swing check Lift check Tilting disk check Double D check Silent check Stop check Self acting relief Self acting safety Power Optd relief VALVE FUNCTIONS AND TYPES
  5. 5. Isolation Valves  Used for on-off service (including throttled position) with local or remote actuation. Depending on the particular application and operating conditions,
  6. 6. Isolation Valves  Isolation valves, both manual and power operated, are typically used to isolate a system component or a section of the piping system for:  Maintenance  Testing (for example, hydrostatic, pneumatic, operational, or functional)  Diversion of flow from one system component or piping section to another to facilitate load adjustments .
  7. 7. Gate valve- isolation functions  A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid.  The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restric-tion is desired.
  8. 8. GLOBE VALVES—ISOLATION FUNCTION  Globe valves are normally metal or hard-seated, but they can be furnished with resilient disc inserts or seats that are suited for compressed air, compressed gas, or fluids that contain small particles of foreign material.
  9. 9. BUTTERFLY VALVES—ISOLATION FUNCTION Butterfly valves are high pressure recovery valves (also called high capacity and high area ratio valves) with relatively small overall pressure drop in the fully open position as compared to globe valves.
  10. 10. BALL VALVES—ISOLATION FUNCTION  Ball valves are quarter-turn valves, occupy less vertical space than rising stem valves,and can be installed in almost any orientation.  Ball valves are bi-directional except for some eccentric or wedged ball designs.
  11. 11. PLUG VALVES- isolation functions  Like the ball valve, the plug valve is a quarter-turn valve. It uses a cylindrical or conical-shaped closure member instead of the spherical shape used in the ball valve.
  12. 12. DIAPHRAGM VALVES—ISOLATION FUNCTION  The diaphragm valve is comprised of a bonnet, body, and flexible-sealing member. The flexible sealing member is available in a variety of materials such as Buna-N, Viton, TFE, polyethylene, or neoprene.  This valve is particularly suited for corrosive fluid, slurries, scale-forming service, and where zero stem leakage is mandatory
  13. 13. Control Valves  Used for modulating or throttling service. Their operation is automatic in response to continuous monitoring of some parameter in the controlled system.  In general, control valves require no manual operator action.  A control valve functions as a variable resistance in a pipeline.
  14. 14. Control Valves  A modulating control valve is a device used to automatically throttle process fluids as required by changes in a variable such as pressure, temperature, flow, or liquid level.
  15. 15. TOP GUIDED CONTROL VALVE Top-guided, single-ported valves may be used for tight shutoff applications; however, because these valves are unbalanced, they can require more force from the actuator to achieve shutoff if the flow is under the plug.
  16. 16. CAGE GUIDED VALVES  Cage-guided valves have a cylindrical plug guided through a guide.  The increased guiding area is desirable for high pressure drop, high noise, and anticavitation applications  Unbalanced types can provide a tight shutoff if sufficient  For balanced styles, the plug is vented and the process pressure interacts with the top and bottom side of the plug.
  17. 17. DOUBLE SEATED CONTROL VALVE  Double-seated control valves are used to a lot of industrial applications due to advantages of reduction in actuator force, a great flow capacity and a deal of slurry fluids.  Double-seated valves cannot provide the same shutoff capability as the single-ported types.
  18. 18. Pressure Relief Valves  Used to provide protection against excessive pressure.  The valve opens automatically when pressure exceeds a preset level and closes after pressure recedes below a preset level.  Power-operated relief valves that open or close in response to command signals are also utilized.
  19. 19. Pressure relief valves
  20. 20. Check valves  Used to allow flow in the normal flow direction and to prevent flow in the opposite flow direction (reverse flow).  Check valves are typically opened and closed by the flow forces.
  21. 21. Check Valves  Check valves are self-actuated valves whose functions include:  Prevention of reverse flow  Keeping lines full of fluid  Prevention of loss of fluid when the system is not in operation  Prevention of reverse rotation of pumps  Prevention of outflow of fluid from vessel  Prevention of water column separation  Check functions are generally satisfied by using lift, swing, tilting disc, double disc, or silent (nozzle) check valves.
  22. 22. Swing Check Valves  Swing check valves are the most common type of check valve currently in plants due to their simple design, low pressure drop, economy, reliable sealing, relative ease of repair, and availability in a wide range o f sizes.  Swing check s consist of a heavy disc suspended from a hinge pin located above the f low stream . They rely on gravity force for clo sure. The disc and h inge arm can be of one piece o r two piece construction .
  23. 23. Tilt Disc Check Valves  Tilt check valves differ from the swing check valves in that the hinge pin is located in the flow stream , just above the center line of the disc .  The pressure loss, the flow rate at which the disc fully opens, and the speed o f closure are controlled primarily by the mass of the disc , the maximum angular rotation of disc, and the amount that the hinge pin is offset from the disc centerline.
  24. 24. Check valves  Tilt Disc Check Valves  Lift check valve
  25. 25. Valve End Connections Valves can be connected to pipes in several ways, including:  · Threads  · Welding  · Brazing  · Soldering  · Flanges and bolts  · Flared or hub ends
  26. 26. Valve Symbols
  27. 27. THANKING YOU

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