The 5 Difference of Transmitter Valve Manifolds And Gauge Valve Manifolds

Transmitter Valve Manifolds

Ⅰ. Gauge Valve Manifolds

Gauge valve manifolds (commonly known as gauge needle valves or valve sets) are typically installed between a pressure gauge and the pipeline. Their primary functions include:

1. Isolation and Shut-off:

• Allows quick isolation of the pressure gauge from the pipeline, facilitating maintenance or gauge replacement and preventing leakage.

2. Vent, Drain, and Blow-down:

• Provides a vent or drain port to safely release residual pressure or fluid during maintenance or gauge replacement.
• Helps remove contaminants or solid particles from the gauge pipeline, preventing blockage or damage.

3. Pressure Gauge Protection:

• Rapidly isolates the gauge during sudden pressure surges, protecting it from damage due to overpressure.

4. Calibration and Testing:

• Facilitates online calibration of pressure gauges when used with test equipment.

Typical Structure:

• Single valve, double valve (with vent/drain valve), or three-valve combinations (with calibration ports).

Ⅱ. Pressure Transmitter Valve Manifolds

Transmitter valve manifolds (typically called 3-valve or 5-valve manifolds) are usually installed between a pressure transmitter and the pipeline. Their main functions include:

1. Isolation and Transmitter Protection:

• Allows isolation of the transmitter from the system for easy maintenance, calibration, or replacement.

2. Pressure Equalization and Calibration:

• Features an equalizing valve that balances pressure across the transmitter for easy zero-point calibration.
• Prevents sudden pressure shocks to the transmitter during maintenance.

3. Venting, Draining, and Air Bleeding:

• Transmitter Valve Manifolds Provides safe venting and draining of fluid or gas during maintenance.
• Helps eliminate trapped air, gas bubbles, or contaminants, ensuring accurate measurements.

4. Improved Measurement Accuracy and Reliability:

• Proper use of manifolds prevents accumulation of gases or impurities, enhancing measurement stability and accuracy.

Typical Structure:

• 3-Valve Manifold: Two isolation valves and one equalizing valve.
• 5-Valve Manifold: Two isolation valves, one equalizing valve, plus two vent/drain valves (commonly used with differential pressure transmitters).

III. Summary of Differences

Ⅳ. Applications:

• Gauge Valve Manifold Example:

Installed on a boiler pipeline, the manifold allows quick isolation of the pressure gauge during maintenance or replacement without interrupting system operation.

• Transmitter Valve Manifold Example:

Used with differential pressure transmitters in flow measurement systems (such as orifice plates), a 5-valve manifold enables online calibration and easy maintenance without impacting production.

What is the difference between Hongji instrumentation Valve manifold and other brands.

Stem DesignInstead of using integral stem, we are using two split joint stem ro realize the lower stem is non-rotating function, in this way, it could minimize the abrasion between the tip and seat, extend the life cycle.

No only that, we also involve special chemcial treatment to harden the stem to make it more endurence under high torque. Stellite tip and Ceramic tip also available for option, locked pin design on lock nut to proevent unexpected loosen, also the grinding process involved on body surface to remove visible defects with the naked eye. If you have any needs for the valve manifolds pls feel free to contact us!