Pneumatic Diaphragm Single-Seated Control Valve
Pneumatic Diaphragm Single-Seated Control Valve
Pneumatic Diaphragm Single-Seated Control Valve
Pneumatic Diaphragm Single-Seated Control Valve

Pneumatic Diaphragm Single-Seated Control Valve

  • Low-resistance single-seat body with strict leakage control, ideal for viscous and fibrous media
  • Pneumatic diaphragm actuator; linear, equal-percentage or quick-open; 30:1 rangeability
  • DN20-400, PN0.6-6.4 MPa; WCB/stainless steel; -100 ~ +450°C versions

Category

Overview

ZJHP Pneumatic Diaphragm Single-Seated Control Valve is a widely used final control element in automatic control systems, consisting of a pneumatic diaphragm actuator and a low-flow-resistance control valve. The single-seated valve is suitable for applications with strict leakage requirements, low differential pressure across the valve, and viscous media or media containing fibers. The double-seated valve features low unbalanced force, large allowable differential pressure and high flow capacity, suitable for applications without strict leakage requirements. The cage valve features good stability, low vibration, low noise and low temperature sensitivity, suitable for applications with relatively large differential pressure and no strict leakage requirements.

Performance Specifications

Item
Index Value
Basic Error (%) Without positioner ±5.0
With positioner ±1.0
Hysteresis (%) Without positioner 3.0
With positioner 1.0
Dead Band (%) Without positioner 3.0
With positioner 0.4
Allowable Leakage (L/h) 1×10-3 × rated flow capacity

Specifications and Technical Parameters

Nominal Diameter (mm)
20
25
40
50
65
80
100
150
200
250
300
350
400
Seat Diameter (mm)
 10 12 15 20 25 32 40 50 65 80 100 125 150 200 250 300 Custom sizes available on request
Rated Flow Coefficient Kv Linear 1.8 2.8 4.4 6.9 11 17.6 27.5 44 69 110 176 275 440 690 1000 1600
Equal Percentage 1.6 2.5 4 6.3 10 16 25 40 63 100 160 250 400 630 900 1440
Nominal Pressure (MPa) 0.6 1.6 4.0 6.4
Stroke (mm) 10 16 25 40 60 100    
Flow Characteristic Linear, equal percentage, quick-open
Media Temperature (°C) -15 ~ 200 (normal temperature type), -40 ~ +250, -40 ~ +450 (medium temperature type), -100 ~ +200 (low temperature type)
Flange Dimensions Cast iron flange dimensions per JB78; cast steel flange dimensions per JB79
Flange Type Conforms to JB78-59 and JB79-59 standards; can be manufactured to JB/79.1-94, JB/79.2-94, ANSI, JIS, DIN and other standards upon order
Body Material PN (MPa) 0.6, 1.6 WCB(ZG230-450) CF3CF8 CF8M
4.0, 6.4 WCB(ZG230-450), ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti CF8 CF8M
Body Type Straight-through single-seated cast spherical valve
Plug Material 1Cr18Ni9, 0Cr18Ni12Mo2Ti CF8 CF8M
Bonnet Type Plain (normal temperature type), finned (medium temperature type), low temperature type
Available Accessories Positioner, handwheel, electric/pneumatic converter, air filter regulator
Rangeability R 30:1
Air Supply Connection M16×1.5

Actuator Technical Parameters

Model
ZHA(B)-1
ZHA(B)-2
ZHA(B)-3
ZHA(B)-4
ZHA(B)-5
ZHA(B)-6
Effective Area (cm²) 200 280 400 630 1000 1600
Stroke (mm) 10 16 25 40 60 100
Spring Range (kPa) 20 ~ 100 (standard); 40 ~ 200; 80 ~ 240; 20 ~ 60; 60 ~ 100

Allowable Differential Pressure

Supply Pressure (MPa)
Spring Pressure (kPa)
Nominal Diameter
20
20
20
20
25
32
40
50
65
80
100
125
150
200
250
300
Seat Diameter
 10 12 15 20 25 32 40 50 65 80 100 125 150 200 250 300
0.14 20-100 Allowable Differential Pressure (MPa) 5.3 3.7 2.3 1.3 0.8 0.5 0.5 0.3 0.25 0.2 0.12 0.12 0.08 0.05 0.05 0.035
0.24 40-200 6.4 6.4 5.5 3.1 1.8 1.2 1.1 0.7 0.65 0.45 0.18 0.18 0.10 0.10 0.10 0.07

Overall Dimensions

DN
D
PN (MPa)
H
H1
1.6
4.0
6.4
Normal Temperature Type
Medium Temperature Type
25 280 185 190 200 685 835 115
32 280 200 210 210 696 847 120
40 325 220 230 235 754 905 130
50 325 250 255 265 784 935 145
65 410 275 285 295 1065 1219 180
80 410 300 310 320 1076 1239 195
100 410 350 355 370 1085 1248 200
125 495 410 425 440 1286 1498 245
150 495 450 460 475 1306 1518 255
200 495 550 560 570 1381 1593 275
250 620 670 740 752 1455 1645 380
300 620 770 803 819 1510 1690 430

Main Parts Materials and Temperature Range

Part Name
Material
Temperature Range
Valve Body & Upper Bonnet HT200 -20 ~ 200°C
ZG230-450 -40 ~ 450°C
ZG1Cr18Ni9Ti -250 ~ 550°C
Plug, Seat & Stem 1Cr18Ni9 -250 ~ 550°C
Upper & Lower Diaphragm Plates A3 steel plate  
Yoke & Top Cover HT200  
Compression Spring 60Si2Mn  
Corrugated Diaphragm 5806 rubber with 480D nylon 66 mesh fabric  
Packing PTFE -40 ~ 200°C
Carbon Fiber -120 ~ 350°C
Flexible Graphite -40 ~ 600°C

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