Description
Shangyi 21000 Series Pneumatic Single-Seat Control Valve Technical Data and Selection Guide
Shangyi 21000 Series Pneumatic Single-Seat Control Valve is supplied by SANTAN for industrial process control, pipeline instrumentation and maintenance replacement projects.
Product Overview
The Shangyi 21000 series pneumatic single-seat control valve is used for modulating liquid, gas and steam service where accurate throttling and dependable shutoff are required.
Shangyi Product-Family Information
The official Shangyi valve catalogue identifies the 21000 series as a pneumatic single-seat valve family. Valve sizing and trim selection must be based on process data rather than nominal pipe size.
Detailed Technical Parameters
| Parameter | Selection Guidance |
|---|---|
| Function | Modulating control and shutoff according to trim/seat design |
| Sizing data | Flow, inlet/outlet pressure, temperature, density, viscosity and vapor pressure |
| Body size/rating | DN/NPS and pressure class matched to pipeline specification |
| Body material | Carbon steel, stainless steel or alloy by process conditions |
| Trim | Plug, seat and cage/material selected for pressure drop and corrosion |
| Flow characteristic | Linear, equal-percentage or model-specific characteristic |
| Leakage | Seat leakage class and soft/hard seat according to requirement |
| Actuator | Pneumatic diaphragm or piston arrangement sized for thrust |
| Fail action | Air-to-open/close and fail-open/close as required |
| Positioner | Pneumatic, electro-pneumatic or smart positioner options |
Typical Industry Applications
Steam and utility control, chemical dosing, pressure reduction, reactor feeds, heat exchangers, refinery and power-plant control loops.
Information Required for Model Selection
Medium, flow range, inlet/outlet pressure, temperature, pipe size/class, body/trim materials, cavitation/flashing/noise, leakage, actuator supply, fail action, positioner and approvals.
Engineering Notes
- Confirm the complete model code and nameplate before ordering a replacement.
- Verify process compatibility, pressure/temperature limits and installation against the approved manufacturer datasheet.
- Final specifications vary by model suffix, materials, signal and certification.
- SANTAN can review project tags, datasheets and replacement requirements before quotation.
Request Technical Confirmation and Quotation
Email sales@santanfluid.com or contact WhatsApp +86 136 9022 318. No online payment is required.
Standard Technical Specification Summary
Use these fields for preliminary selection. Final values depend on the complete manufacturer model code and selected options.
| Model | Shangyi 21000 Series Pneumatic Single-Seat Control Valve |
|---|---|
| Measurement Range | Configuration-dependent; confirm the required span and complete model code. |
| Accuracy | Configuration-dependent; confirm the accuracy class and calibrated range. |
| Process Connection | Configuration-dependent; confirm size, rating, standard and wetted materials. |
| Output Signal | Configuration-dependent; confirm analog, digital and communication requirements. |
| Certifications | Confirm hazardous-area, functional-safety, sanitary, marine or custody-transfer approvals by model code. |
| Application Industries | Application-dependent; confirm medium, process conditions and industry requirements. |
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