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Manifold & Hook-up Selection Guide
(2 / 3 / 5 Valve)
Safe isolation, venting and calibration-ready hook-ups for pressure and differential pressure measurement. Correct manifold selection reduces leaks, downtime and unsafe maintenance.
Suggested email subject: MANIFOLD | Hook-up Selection Support
What is a Manifold?
- A manifold is the valve block installed between the process and a pressure or DP instrument (gauge/transmitter). It allows safe isolation, venting, equalization (for DP), and convenient calibration without dismantling the instrument.
- In many plants, the manifold/hook-up quality defines long-term reliability more than the transmitter itself.
Quick Selection: 2-Valve vs 3-Valve vs 5-Valve
2-Valve Manifold
- For pressure gauges and pressure transmitters
- One isolation + one vent/drain (common configuration)
- Best when only single pressure is measured
3-Valve Manifold
- For DP transmitters (two process lines)
- Two isolation + one equalizing valve
- Used for zero check and maintenance
5-Valve Manifold
- For DP transmitters needing safer vent/drain
- Two isolation + one equalizing + two vent/drain
- Preferred where bleeding/flushing is required
When to Prefer 5-Valve Manifolds
- Use 5-valve manifolds when you need safer venting/draining, faster calibration, or when the process media may need flushing during maintenance.
- Hazardous or corrosive services (safety first)
- Slurry or clogging risk (needs flushing capability)
- Frequent calibration / maintenance environment
- Where bleeding both high and low sides is required
Hook-up Design Principles (What Engineers Care About)
| Goal | What to Do | Why it Matters |
|---|---|---|
| Leak prevention | Use correct fittings, torque, and compatible materials | Small leaks become major shutdown risks over time |
| Serviceability | Provide isolation + vent/drain for safe removal | Reduces downtime and unsafe maintenance |
| Stable readings | Minimize impulse line length; avoid trapping gas/solids | Prevents lag, clogging and unstable DP signals |
| Calibration readiness | Provide test points and proper manifold type | Enables routine checks without dismantling |
Common Mistakes (Causes of Repeat Failures)
- Using 2-valve manifold for DP applications
- No vent/drain provision → unsafe bleeding during maintenance
- Impulse lines too long or poorly routed → lag, clogging, false DP
- Wrong material selection → corrosion and leakage
- No thought to access → calibration skipped, drift unnoticed
Spec Checklist (Share Before Ordering)
- Pressure or DP? (single line or high/low sides)
- Process pressure/temperature and media type
- Material requirement (SS316, special alloy if needed)
- Need for vent/drain/flushing (5-valve preference)
- Mounting orientation and available space
- Share a P&ID or a photo of the tapping points for the fastest and safest selection.
