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3-Valve/5-Valve Instrument Manifolds

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  • Manifold Valves – 2 Way
  • Manifold Valves – 3 Way
  • Manifold Valves – 5 Way
  • T & H Type Manifold Valves
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Instrumentation Manifold Introduction

Instrument manifolds are a type of process connection system that provides isolation, venting, and equalization for various types of pressure measurement applications. Manifolds are typically used with other measurement instrumentation including pressure transmitters, gauges, or any other pressure sensing device.

The valve manifold used to protect the DP transmitter from higher range. This device isolates the transmitter from fluid pressure for calibration and for maintenance purposes.

The manifold is a combination of valves in a single body. Each valve will have separate openings ad controls.

The manifolds commonly use the ball, bleed, needle, and vent valves.

The 3 valve manifolds consist of 3 valves with two block valve and one equalizing valve. There is an extra “bleed” valve, used to vent trapped fluid pressure to atmosphere.

Button Operated Chart Recorder Feature

Benefits of the Direct Mount Manifold

  • Less expensive installation

  • Less expensive maintenance

  • Fewer leak points

  • System still hard piped

  • Integrated valves

As for the remote mount manifolds, because they’re mounted indirectly onto lines instead of instruments, their biggest advantage is that they’re used to protect instruments from temperature beyond their limits by reducing and/or increasing process temperature.

Take a look at more benefits to using a remote mount manifold.

Benefits of the Remote Mount Manifold

  • Easier installation

  • Easier maintenance

  • Fewer leak points

  • Uses tubing and tube fittings

  • Uses standard instrument manifolds

  • The piping is mounted to the transmitter


Instrumentation Manifold Specification 

The following information is on the different types of manifold’s construction and is paraphrased from the Instrumentation and Control Qualification Reference Guide.

2-Way Valve Manifold

This image shows what a 2-valve instrumentation manifold looks like and its flow map.

A typical composition of the 2-way valve manifold is 1 block valve and 1 drain or test valve.

For use on a pressure transmitter to test pressure, the procedure is to close the block valve and open the drain valve. When the drain valve is opened, the next step would be to connect the valve to a pressure generator to test pressure.

The 2-valve manifold is also called a block and bleed valve.

3-Way Valve Manifold

This image shows what 3-valve instrumentation manifolds look like and its flow map.

The 3-valve manifolds standard configuration includes 2 block valves and 1 valve, called an equalizer valve, which provides equal pressure on both sides.

Differential pressure transmitters often use 3-way manifolds to operate making them the most commonly used manifold configuration. The method of a 3-valve manifold with a DP transmitter is to close the block valve and open the equalizer valve to check the zero of a DP transmitter.

5-Way Valve Manifold

This image shows what 5-valve instrumentation manifolds look like and their flow maps.

DP transmitters also use 5-way valve manifolds. The composition of a 5-way valve manifold is similar to a 3-way valve manifold in that it has 2 block valves and 1 equalizer valve. The two valves that make it different are the additional vent or test valves.

The method for calibration of a 5-valve manifold is to close the block valve and open the equalizing valve to check the zero of the transmitter. After equalizing the pressure, system operators connect the test valve of the manifold to a pressure generator for 3 or 5 point calibration.

Because of their advanced 5-valve technology, 5-valve manifolds are more popular for differential pressure transmitters than 3-way valve manifolds.


-Manuals

Instrumentation Manifold

-Data sheet


Instrumentation Manifold Application

Applications for the instrumentation manifolds allow for safe, proper isolation, venting and calibration of offline instruments, including pressure and differential pressure indicators, switches and transmitters. Industries served include upstream Oil & Gas, Oil Refining, Chemical, Water & Wastewater and Semiconductor, among others.




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