Union Tee Connector Fitting

Union Tee Connector Fitting Product Overview

SIYelectric Union Tee Connector Fitting is designed to connect three tube or pipe lines in instrumentation, fluid, gas, hydraulic, pneumatic, and process systems.

Compared with a standard tee fitting, a union tee connector provides a removable three-way connection, making installation, inspection, cleaning, and maintenance more convenient. It is commonly used when a system needs to distribute flow, combine flow, add a branch line, or create a connection point for instruments and testing equipment.

With suitable material, sealing structure, connection size, and pressure rating, the union tee connector can be used in compact systems where reliable sealing and easy disassembly are important.

How It Works

Compatible Instruments and Components

This union tee connector fitting can be used with:

• Pressure transmitters
• Differential pressure transmitter impulse lines
• Pressure gauges
• Pressure switches
• Gauge valves
• Needle valves
• Ball valves
• Instrument manifolds
• Calibration lines
• Test ports
• Sampling lines
• Analyzer systems
• Hydraulic and pneumatic control panels

For pressure measurement systems, union tee connectors are often used where tubing from a pressure transmitter, DP transmitter, manifold, gauge valve, or calibration line needs an additional branch connection.

Typical Application Scenarios

1. Instrument Tubing Branch Connection

Used where an instrument tubing line needs to be split, combined, or connected to an additional branch.

Typical examples include:

• Pressure transmitter impulse tubing
• Differential pressure transmitter tubing
• Calibration tubing
• Gauge valve outlet tubing
• Analyzer sample lines
• Gas panel tubing

2. Pressure Instrument Assemblies

Suitable for pressure gauge, pressure switch, pressure transmitter, and manifold installations where one line needs to connect with another instrument or test point.

It can help connect:

• Pressure gauges to tubing branches
• Transmitters to impulse lines
• Manifolds to calibration lines
• Gauge valves to test ports
• Pressure switches to control tubing

3. Sampling and Analyzer Systems

Used in gas sampling lines, liquid sampling systems, analyzer cabinets, laboratory equipment, and process monitoring skids.

Common use cases include:

• Sample line distribution
• Calibration gas branching
• Analyzer bypass lines
• Test fluid routing
• Laboratory flow path setup

4. Hydraulic and Pneumatic Control Lines

Applied in hydraulic power units, pneumatic panels, actuator control circuits, pressure test systems, and compact equipment assemblies where a removable three-way connection is required.

5. Process Skids and Industrial Fluid Systems

Suitable for dosing skids, filtration units, gas panels, water treatment modules, chemical process equipment, and general industrial assemblies.

For corrosive media, high-pressure service, or high-temperature applications, material, connection type, sealing method, and pressure rating should be confirmed before selection.

Key Benefits

Selection Notes

Before selecting a union tee connector fitting, confirm:

• Tube or pipe outer diameter
• Connection type, such as tube fitting, threaded, or compression type
• Material grade, such as SS304 or SS316
• Working pressure
• Working temperature
• Process medium
• Required sealing method
• Whether the fitting is used for distribution, convergence, sampling, calibration, or instrument connection
• Installation space and maintenance requirements

Correct selection helps ensure reliable sealing, stable pressure performance, and convenient maintenance.

Main Advantages

• Provides a compact three-way connection for tube and pipe systems.
• Union structure allows easier installation and disassembly than fixed tee fittings.
• Suitable for pressure transmitters, DP transmitters, gauges, manifolds, valves, sampling systems, and analyzer panels.
• Supports flow distribution, convergence, sampling, calibration, testing, and instrument branch connections.
• Helps simplify tubing layouts in instrument panels and process skids.
• Stainless steel options support long-term use in industrial environments.
• Available in different sizes, materials, and connection types according to project requirements.