Utmost Flow Control Technology Co., Ltd.
Utmost Flow Control Technology Co., Ltd.

Basic Knowledge and Routine Maintenance of Three-way Regulating Valve

Brief introduction of three-way regulating valve

The three-way regulating valve is composed of a straight-stroke electronic electric actuator and a three-way confluence (split) valve with a cylindrical thin-walled window-shaped valve core. This automated control valve has a compact structure, lightweight, sensitive action, and accurate flow characteristics. It can directly control the operation by receiving control signals such as 4-20mA and single-phase power supply, and realize automatic adjustment and control of the fluid medium of the processing pipeline. It is widely used in precise control of gas, The process parameters of liquid, steam and other media such as pressure, flow, temperature, liquid level and other parameters are kept at given values. It is suitable for the working condition of dividing a fluid into two channels through a three-way valve or combining two fluids into one fluid through a three-way valve.

Classification of three-way valves

The 3 way regulating valve has two structural forms: L-type and T-type. The L-type is a vertical double-hole channel, and the main pipeline is normally connected. The valve stem is driven to rotate the valve core by 90° so that the flow direction of the medium can be switched between the two branch pipelines; T The three-channel type is suitable for the splitting, confluence or flow direction switching of the medium. Through different settings, the three channels can be connected to each other or two of them can be connected.

Daily maintenance after the three-way regulating valve is put into use

1. Ensure that the air source is clean and the power supply is reliable

The national standards for regulating valve products have clear regulations on the gas source and power supply. The electric valve should be powered strictly according to the requirements of voltage, the number of phases, AC and DC, and grounding, and the wiring should be reliable.

The air source must be dry and clean, free from oil, water, dust and other corrosive substances, to prevent the accelerated ageing of the rubber diaphragm in the actuator and the positioner, and to prevent the constant orifice in the positioner from being blocked.

The air filter pressure reducer used for supplying air to the pneumatic valve or valve positioner should be used correctly, the filtered oil, water and dirt should be removed in time, and the filter element should be cleaned regularly.

2. Regular inspection and refuelling

After the control valve is used, it should be checked regularly, and the focus is on whether the action is smooth.

Check whether the connection between the pushrod and the valve stem is loose and whether there is leakage at the packing and valve body gasket. A common phenomenon is that there is leakage at the packing, and the packing nut should be tightened in time. If an oiler is used, oil it regularly.

In places with acid mist or corrosive gas, the exposed valve stem should be protected by plastic pipe or rubber bellows. If the protective cover is found to be broken, replace it in time.

3. Add appropriate protective measures in particularly harsh environments

Although the valves and flow control are made of steel, it is quickly damaged in harsh environments such as sun exposure, flying sand, and wind and snow. These situations are often not thought of in advance. After use, simple protective facilities are added to protect from sun and rain and isolate wind. Sand extends the valve life.

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