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FIG681 Pneumatic bellow 3 way control valve

FIG681 Pneumatic bellow 3 way control valve

*All electronic electric actuators, adopting the structure

*powerful function, reliable performance, simple connection, high controlling accuracy

*Designed for frequent switch, control requirement of working conditions and design

*beautiful appearance, seal tightly don't leak, long service life

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Product Description

*All electronic electric actuators, adopting the structure

*powerful function, reliable performance, simple connection, high controlling accuracy

*Designed for frequent switch, control requirement of working conditions and design

*beautiful appearance, seal tightly don't leak, long service life


Body

Bore DN15~DN500mm
Nominal pressure PN16~PN420,5K~63K,150LB~2500LB
Applicable temperature -196℃~+650℃
Applicable medium gas,water,oil,steam etc
Connection flange,SW
Bonnet type Normal type ,High temperature type, Bellows type , Low temperature type
Stuffing PTFE,Flexible graphite
Seat PTFE
Body material WCB,WC6,WC9,CF8,CF8M,CF3M etc

Trim

Flow Characteristic quick-open, equal percentage, Linear

Actuator

Type Single spring diaphragm cylinder,multi-spring diaphragm cylinder,piston type/Double-acting cylinder,electric.

Model

 Introduction

 FIG681

 Valve type 

 TYP300

CV3000 type

 TYP900

 forged steel sleeve type steam trap valve

  TYP910

 forged steel labyrinth control valve

 TYP920

 forged steel cascade throttle control valve

 FIG580

 2 ways control valve 

 FIG680

 3 ways control valve 

 FIG681

 3 ways bellows sealing control valve 

 JX480

 slide valve

 Actuator

 A

 single spring diaphragm type 

 B

multi-spring diaphragm type 

 C

 single action piston 

 C1

double action piston

 D

 electric

 F

electric-hydraulic

 E

 manual

 G

 pneumatic-hydraulic

 H

 other

 Open/Close type 

 air to open type

 2

air to close type

 3

 electricity to open 

 4

 electricity to close 

 Action type

 direct action

 B

 reaction

 Handwheel

 1

 without handwheel 

 2

top mount the handwheel

 3

Side mount the handwheel

  Connection  

 F

flange

 H1

 butt welding

 H

 socket

 S

internal thread 

 S1

 external thread 

 J

 wafer type

 K

 other

 Valve trim structure

 shut-off valve 

 2

 sleeve single seat valve

 3

sleeve double seat valve

 4

porous type noise reduction cage

 5

 labyrinth cage

 6

multistage depressurization type cage

 7

 other

 Valve core structure

A

balanced internal parts

 B

unbalanced internal parts

 Valve bonnet type

 standard type 

 2

cooling fin type

 3

 lengthen type

 4

 bellow type

 5

 clamp cover  type

 6

 other

 Flow characteristic

 quick opening

 2

 linear

 3

 equal percent

 4

fixed percentage

 Valve seat material

 1

 RPTFE

 2

 alloy steel

 3

 cemented carbide

 4

 tungsten steel

 5

 other

 Norminal diameter

DN 

 DN15-DN500

 Norminal pressure 

 PN

 PN10-PN760

 LB

 150LB-2500LB

 K

 5K-60K

 Material type

1

 WCB

 2

 WC6

 3

 WC9

 4

 CF8

 5

 CF3

 6

 CF8M

 7

 CF3M

 8

 A105

 9

 F91

 10

 F22

 11

 other

 Illustraton

 1、TYP300-B-1-A-2-F-2-A-1-3-1-DN50-PN25-CF8

   1.CV3000 series,Multi-spring diaphragm cylinder,air to open type,direct action,top mount the handwheel,sleeve single seat valve,balanced internal parts ,standard valve bonnet,equal percent type,RPTFE valve seat,norminal diameter DN50,norminal pressure PN25,CF8 material.

Working principle of pneumatic control valve
Pneumatic control valve drives itself by compressed air as power source , cylinder as actuator and with some attachments ,such as electric-pneumatic positionedconverter solenoid valvelock up valve and so on. It realizes the switch quantity or proportional adjustment, and receives the control signal of industrial automation control system to complete regulating the flow pressure temperature and other various process parameters of pipeline medium. Pneumatic control valve has characteristics of simple controlling, quick response, and intrinsically safe without additional explosion prevention measure.


Pneumatic control valve’s actions are divided into 
Air to open type and 
Air to close type. Air to open type is that when the air pressure on membrane head increases, valve moves in the direction of opening increasing; until it reaches to input pressure limit, the valve is in the fully open position. In reverse, when the air pressure is reduced, valve moves in the direction of closing, when there is no input air, the valve is fully closed.


So sometimes, 
Air to open type is also called Fail to Close/ FC type. Air to close type‘s movement direction is just the reverse of Air to open type. When the air pressure increases, valve moves in the direction of closing; when air pressure decreases or disappears, valve moves in the direction of opening or until fully open. So sometimes it’s called Fail to Open /FO. Pneumatic control valve belongs to which type is according to positive and negative effects of the actuator and different assemble ways of valve structure.


Choosing 
Air to open or Air to close is according to safety perspective of the process of production. When cut off the air source, in the closed position or open position control valve is safe?


For example, a heating furnace combustion control, the control valve is installed in the fuel pipe, according to the temperature of furnace or the heated material in furnace exit to control the supply of fuel. At this time, 
Air to open type valve is safer, because once stop the air supply, It’s more suitable in closed position than in fully open position for valve.


If air supply is cut off, fuel valve is fully open, risk will appear because of 
excessive heating. And such as a cooling heat-exchange equipment with cooling water, hot material in the heat exchanger are cooled when having heat exchange with cooling water, control valve is installed on the cooling water pipe, temperature of heat exchanged materials is used to control the cooling water’s volume, when the air supply is cut off, control valve in open position is more safe, Air to close type is appropriate.


Valve positioner is the main accessory of control valve, it accepts the regulator output signal, and then controls the pneumatic control valve by its output signal, when control valve moves, the displacement of valve stem feedback to valve positioner through mechanical device, valve position condition will be sent o the upper system through the electrical signal .


According to valve positioner structure and working principle ,it can be divided into pneumatic valve positioner, electric-pneumatic valve positioner and smart valve positioner.

      
Valve positioner can increase the output power of control valve, reduce the transmission lag of control signal, speed up movement of valve stem, improve the linearity of valve, overcome the friction of valve stem and eliminate the influence of unbalanced force, so as to ensurepositioning rightly.


valve positioner

      
Actuator has pneumatic actuator, electric actuator, straight stroke and stroke.