ZMAQ pneumatic diaphragm three-way control valve
I. Introduction:
The nominal pressure of ZMAQ pneumatic diaphragm three-way control valves includes PN16, 40, and 64; the nominal diameter ranges from DN25 to 400. The applicable fluid temperature ranges from -60℃ to +450℃. The leakage classes are Class II and Class IV. The flow characteristics are linear and parabolic, with multiple specifications available. It adopts a cylindrical thin-walled window-type valve core guide, which is different from the bushing guide of the plunger-type valve core. Equipped with a multi-spring actuator, it has the advantages of simple structure, light weight, small volume, and convenient disassembly and assembly. It is widely used to precisely control gases and liquids to maintain them at a given value. It is suitable for occasions where one fluid is split into two paths through a three-way valve, or where two fluids are merged into one fluid through a three-way valve. The control valve is used to adjust the flow rate, pressure, and liquid level of the medium. Based on the signal from the adjustment part, it automatically controls the opening of the valve, thereby adjusting the flow rate, pressure, and liquid level of the medium.
II. Features:
Pneumatic diaphragm three-way control valves can replace two two-way valves and one three-way pipe in some occasions, thus being widely used. They are commonly used in the two-phase adjustment of heat exchangers and can also be used for simple ratio adjustment. When the nominal diameter and pressure difference are small, the converging valve can be used in diverging occasions and can be interchanged. However, in diverging occasions where the nominal diameter is larger than 80mm and the pressure difference is large, they cannot be interchanged. Available accessories: positioner, handwheel mechanism, air filter pressure reducer, etc.
III. Parts Materials:
Part Name | Material | Temperature Range |
Valve Body | HT200 | -20～200℃ |
ZG230-450 | -40～450℃ | |
ZG1Cr18Ni9Ti | -250～550℃ | |
Valve Core, Valve Seat, Valve Stem | 1Cr18Ni9 | -250～550℃ |
Gasket | Rubber-asbestos sheet | |
Stainless steel spiral-wound gasket | ||
Packing | Polytetrafluoroethylene (PTFE) | |
Upper and Lower Diaphragm Covers | A3 steel plate | |
Diaphragm | 35CrMoA | |
35, A3 | ||
Bracket, Top Disc | HT200 | |
Compression Spring | 60Si2Mn | |
Corrugated Diaphragm | 5806 adhesive with 480D nylon 66 mesh fabric |
IV. Product Parameters:
Valve Seat Diameter (mm) | Converging | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
Diverging | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||||||
Rated Flow Coefficient Kv | Converging | 8.5 | 13 | 21 | 34 | 52 | 85 | 125 | 210 | 340 | 535 | 800 | 1260 |
Diverging | 85 | 125 | 210 | 340 | 535 | 800 | 1260 | ||||||
Nominal Pressure (MPa) | 0.6, 4.0, 6.4 | ||||||||||||
Stroke (mm) | 16 | 25 | 40 | 60 | 100 | ||||||||
Flow Characteristic | Linear | ||||||||||||
Medium Temperature (℃) | -20～200, -40～+250 (normal temperature type), -40～315 (medium temperature type) | ||||||||||||
Flange Size | Cast iron flange size follows JB79-59, cast steel flange size follows JB79-59 | ||||||||||||
Flange Type | Flange sealing surface type follows JB77-59, among which cast steel flanges are of smooth type, and cast steel flanges are of concave type | ||||||||||||
Valve Body Material | HT200, ZG230-450, ZG1Cr18Ni9 | ||||||||||||
Valve Core Material | 1Cr18Ni9 | ||||||||||||
Upper Valve Cover Type | Ordinary type (normal temperature type), heat insulation sleeve type (medium temperature type) | ||||||||||||
Adjustment Ratio | 30:1 | ||||||||||||
V. Product Specifications:
Model | ZHA (B)-3 | ZHA (B)-4 | ZHA (B)-5 | ZHA (B)-6 |
Effective Area (cm²) | 400 | 630 | 1000 | 1600 |
Stroke (mm) | 16.25 | 40 | 60 | 1000 |
Spring Range (KPa) | 20～100; 40～200, 20～60, 60～100, 80～240 | |||
| Machinery & Equipment/Valves/Control Valves | |
