ZMAP pneumatic diaphragm single-seat control valve
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I. Product Introduction:
The ZMAP pneumatic diaphragm single-seat control valve features a single-seat plunger-type plug guided at both top and bottom. It is suitable for applications requiring strict leakage control, low pressure difference across the valve, media with certain viscosity, and fiber-containing media. For high pressure difference and large-diameter valves, it should be used in conjunction with a positioner. Single-seat valves are suitable for occasions requiring strict leakage control, low pressure difference across the valve, media with certain viscosity, and fiber-containing media; double-seat valves have characteristics such as small unbalanced force, allowable large pressure difference, and large flow capacity, making them suitable for occasions where leakage requirements are not strict; sleeve valves offer good stability, low vibration tendency, low noise, and low sensitivity to temperature, making them suitable for applications with large pressure differences and non-strict leakage requirements.
II. Structural Principle:
The pneumatic diaphragm bellows-sealed control valve is a modified product of pneumatic diaphragm single-seat and double-seat control valves, consisting of a pneumatic diaphragm actuator and a bellows-sealed valve body. Inside the upper bonnet of the valve body, a bellows assembly is installed to isolate the medium from the external environment while allowing the valve stem to move up and down. Additionally, the upper end of the upper bonnet is still equipped with a PTFE "V"-type packing seal, which serves as a secondary seal in case the bellows assembly is damaged. A pressure gauge is also installed on the outer wall of the upper bonnet to indicate the pressure on the outer side of the bellows; if the bellows is damaged for any reason, the pressure gauge reading will increase. Principle: When the actuator air chamber receives a pneumatic signal, it pushes the diaphragm to compress the spring, and drives the push rod, valve stem, and plug to displace, thereby changing the flow area between the plug and the valve seat, altering the flow rate to achieve the purpose of regulating process parameters.
III. Allowable Pressure Difference:
Supply Pressure | Spring Range | Nominal Diameter | 20 | 20 | 20 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 |
Valve Seat Diameter | 10 | 12 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||
0.14 | 20-100 | Allowable Pressure Difference 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 |
IV. Main Technical Parameters of Actuator:
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 | 1000 |
Spring Range KPa | 20～100 (Standard); 40～200; 80～240; 20～60; 60～100 | |||||
V. Main Technical Performance Indicators:
Item | Indicator 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 Valve Capacity | |
| Industry Category | Machinery & Equipment/Valves/Control Valves |
|---|---|
| Product Category | |
| Brand: | 上海舟腾 |
| Spec: | ZMAP |
| Stock: | 99 |
| Manufacturer: | 上海舟腾泵阀制造有限公司 |
| Origin: | 113120 |
