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              Location:PRODUCTS >> Control valve >> Pneumatic two-seat control valve
              Pneumatic two-seat control valve
              Model: ZJHN
              Nominal diameter: DN25 ~ 400mm
              Nominal pressure: PN16 ~ 64MPa
              Temperature: -250 ℃ ~ + 560 ℃
              Main material: HT200, ZG230-450, ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti
              Medium gas, liquid, vapor, etc.: Medium
              Drive mode: pneumatic
              Design criteria: GB / T17213
              Flange standard: GB / T9113, JB / T79 , HG20594 and other standard
              Inspection standards: GB / T4213
              Form connect: flange (FF RF RTJ), welding (SW BW), thread ( Suitable for 1 "or less

              First, the pneumatic two-seat control valve overview

              ZJHN pneumatic two-seat control valve with double-guided structure, equipped with multi-spring recruit agencies. Has the advantages of compact structure, light weight, action sensitive, large valve capacity, accurate flow characteristics, easy disassembly. Pneumatic two-seat control valve is widely used in precise control of gas, liquid, steam and other media process parameters such as pressure, flow, temperature, liquid level at a given value. Particularly suitable for large pressure drop, allowing greater leakage and not very clean media occasions.

              Pneumatic two-seat control valve products are standard, bellows sealed, jacket insulation and other varieties. Product nominal pressure rating PN16, 40, 64; body diameter range DN25 ~ 400. Applicable fluid temperature -250 ℃ ~ + 560 ℃ range of a variety of grades. Leakage standards for grade Ⅲ and Ⅳ. Flow characteristics are linear or percentage. A wide variety of specifications to choose from.


               Second, pneumatic two-seat control valve main parts and materials

              Part Name

              material

              temperature range

              Body valve cover

              HT200

              -20 ~ 200 ℃

              ZG230-450

              -40 ~ 450 ℃

              ZG1Cr18Ni9Ti

              -250 ~ 550 ℃

              ZG0Cr18Ni12Mo2Ti

              -250 ~ 550 ℃

              Spool, seat

              1Cr18Ni9

              -250 ~ 550 ℃

              0Cr18Ni12Mo2Ti

              -250 ~ 550 ℃

              filler

              Teflon

              -40 ~ 200 ℃

              Diaphragm

              NBR rubber reinforced polyester fabrics

              compressed spring

              60Si2Mn

              Membrane cover

              A3

               

              Third, pneumatic two-seat control valve main technical parameters

              Nominal diameter mm

              25

              32

              40

              50

              65

              80

              100

              125

              150

              200

              250

              300

              400

              Rated flow coefficient kv

              10

              16

              25

              40

              63

              100

              250

              250

              400

              630

              100

              1600

              2700

              Nominal pressure MPa

              1.6 4.0 6.4

              Travel mm

              16

              25

              40

              63

              100

              Medium temperature ℃

              -40 ~ 230 ℃ (room temperature type), heat sink 230 ~ 450 ℃ (medium temperature), special order -100 ~ 600 ℃

              Flow characteristics

              Straight line, equal percentage

              Flange standard

              In line with JB78-59, JB79-59 standards, according to JB / 79.1-94, JB / 79.2-94, ANSI, JIS, DIN and other standard production orders

              Body material

              PN (MPa)

              1.6

              WCB (ZG230-450) CF3CF8 CF8M

              4.0,6.0

              WCB (ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti CF8 CF8M

              Spool material

              1Cr18Ni9,0Cr18Ni12Mo2Ti CF8 CF8M

              On the bonnet type

              Ordinary type (normal temperature type), hot type (medium temperature type)

              Adjustable ratio

              30: 1

              Air source connector

              M16 × 1.5


               Fourth, pneumatic two-seat control valve pneumatic actuator

              model

              ZHA (B) -1

              ZHA (B) -2

              ZHA (B) -3

              ZHA (B) -4

              ZHA (B) -5

              ZHA (B) -6

              Effective area of cm2

              200

              280

              400

              630

              1000

              1600

              Travel mm

              10

              16

              25

              40

              60

              1000

              Spring range KPa

              20 to 100 (standard); 20 to 100, 40 to 200, 20 to 60, 60 to 100, 80 to 240


               Fifth, pneumatic two-seat control valve pneumatic actuator main technical performance indicators

              project

              Index value

              Basic error%

              Without locator

              ± 5.0

              With locator

              ± 1.0

              Backlash%

              Without locator

              3.0

              With locator

              1.0

              dead zone%

              Without locator

              3.0

              With locator

              0.4

              Permissible leakage L / h

              1 × 10-3 × valve rated capacity


              Sixth, pneumatic two-seat control valve actuator allows pressure

              Supply pressure MPa

              Spring pressure KPa

              Nominal diameter

              25

              32

              40

              50

              65

              80

              100

              125

              150

              200

              250

              300

              0.14

              20-100

              5.4

              4.4

              4.9

              3.8

              4.7

              3.6

              2.8

              3.75

              2.7

              2.15

              2.0

              1.7

              0.24

              40-200

              10.8

              8.8

              9.8

              7.6

              9.4

              7.2

              5.6

              7.5

              5.4

              4.3

              4.0

              3.4

              Note: The condition of use is P2 = 0 when the stem is out of the media outlet.
               

              Seven, pneumatic two-seat control valve dimensions

              Public Path (mm)

              25

              32

              40

              50

              65

              80

              100

              125

              150

              200

              250

              300

              L (mm)

              PN1.6MPa

              185

              200

              220

              250

              275

              300

              350

              410

              450

              550

              670

              770

              PN4.0MPa

              190

              210

              230

              255

              285

              310

              335

              425

              460

              560

              740

              805

              PN6.4MPa

              200

              210

              235

              265

              295

              320

              370

              440

              475

              570

              750

              820

              H (mm)

              normal type

              567

              570

              645

              650

              877

              887

              899

              1058

              1068

              1110

              1498

              1574

              Heat sink type

              697

              700

              775

              780

              1040

              1050

              1062

              1257

              1267

              1309

              1743

              1819

              H1 (mm)

              117

              120

              139

              144

              188

              208

              220

              268

              278

              320

              441

              503

              D (mm)

              225

              360

              470

              620

              Weight (KG)

              33

              35

              47

              51

              98

              111

              148

              236

              292

              433

              760

              920


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