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Understanding 2, 3, and 5-Valve Manifolds in Instrumentation.

2026-03-19

A valve manifold is used with pressure or differential pressure instruments to isolate, equalize, vent, or calibrate the instrument safely.

The three most common types used in industry are:

1️⃣ 2-Valve Manifold

Used mainly with pressure transmitters or pressure gauges.

It contains one block valve and one bleed/test valve. The block valve isolates the instrument from the process, while the bleed valve helps release pressure or connect a calibrator.

2️⃣ 3-Valve Manifold

Commonly used with differential pressure transmitters.

It contains two block valves and one equalizing valve. This arrangement allows technicians to safely isolate the transmitter and check the zero by equalizing the pressure on both sides.

3️⃣ 5-Valve Manifold

The most widely used manifold for DP transmitters.

It includes two block valves, one equalizing valve, and two vent/test valves. This setup allows isolation, equalization, venting, and calibration without removing the transmitter from service.

Using the correct valve manifold improves safety, reduces leakage points, and makes calibration easier.

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