Spiraxsarco Pneumatic Control Valve and Masoneilan SVI2 Control Valve Positioner and Reliable 4700E Electro-pneumatic Controller and FOXBORO Positioner SRD991
The Masoneilan 4700E is a robust electro-pneumatic positioner that uses a precision multi-lobe cam feedback system to deliver accurate valve positioning, fast response, and customizable control characteristics. Designed for use with both rotary and reciprocating actuators, it converts a 4-20 mA input signal into proportional pneumatic output, making it a trusted choice for demanding industrial control valve applications.
- Multi-lobe cam provides field-selectable linear, split-range linear, or equal percentage characteristics.
- Corrosion-resistant internal components for reliable performance in harsh environments.
- Fully enclosed adjustments protected from weather and contaminants.
- Force-balanced design ensures precise and stable positioning.
- Zero adjustment via spring button and turnbuckle for easy calibration.
- Compact and rugged construction suitable for outdoor and severe service.
- Compatible with Masoneilan control valves for optimized system performance.
| Attribute | Value |
|---|---|
| Type | Electro-pneumatic (4-20 mA input) |
| Action | Direct (increasing signal increases output) |
| Input Signal | 4-20 mA |
| Input Resistance | 170 ohms nominal |
| Deadband | <0.5% of span |
| Hysteresis | <0.5% of span |
| Repeatability | Within 0.5% of span |
| Sensitivity | Better than 0.3% of span |
| Conformity | +1% of span |
| Air Supply | Up to 100 psig (dictated by actuator) |
| Air Consumption | Low steady-state consumption |
| Air Connections | 1/4" NPT |
| Electrical Connections | 1/2" NPT or M20 |
| Operating Temperature | Wide range with temperature effect data available |
| Housing | Die-cast aluminum with corrosion-resistant internals |
| Mounting | Suitable for rotary (direct cam on shaft) or reciprocating actuators (lever and turnbuckle) |
Ideal for precise positioning of control valves in oil & gas, refining, chemical processing, power generation, and other industries where corrosion resistance, fast response, and customizable flow characteristics are required.
Q: What cam characteristics are available? A: Field-changeable linear, split-range linear, and equal percentage.
Q: Is it suitable for harsh environments? A: Yes, with corrosion-resistant materials and fully enclosed adjustments.
Q: Can it be used on rotary valves? A: Yes, the cam mounts directly on the actuator shaft.
Q: How is calibration performed? A: Zero adjustment is easy via the spring button and turnbuckle.
Q: Does it support reciprocating actuators? A: Yes, using a simple lever and turnbuckle assembly.
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