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

Comprehensive Understanding of Electric Single-seat Control Valve

The electric single-seated control valve is a pressure balanced regulating valve. It receives a DC current signal from the regulating instrument to change the flow rate of the controlled medium, maintaining the controlled process parameters at a given value. It is widely used in various industrial sectors such as power, metallurgy, chemical, petroleum, textile, pharmaceutical, and papermaking for process automation control.

Classification of electric single-seated control valve

The electric single-seated control valve, electric sleeve single-seated control valve, and electric cage type single-seated control valve.

Advantages of electric single-seated control valve

The electric single-seated control valve is a new self-actuated temperature control valve. Compared with a manual regulating valve, single seat control valve advantage is automatic adjustment; compared with an electric regulating valve, its advantage is no need for external power. Application practice has proved that with the correct use of this valve in a closed water circulation system (such as a hot water heating system, air conditioning chilled water system), it can conveniently achieve flow distribution, dynamic balance, greatly simplify system debugging, stabilize the pump operating state, etc.

Characteristics of electric single-seated control valve

  • Large adjustable range, intrinsic adjustable ratio of 50, linear and equal percentage flow characteristics.

  • The valve body is designed with an equal cross-section and low resistance flow channel based on fluid mechanics principles, and the rated flow coefficient is increased by 30%.

  • The soft-sealed valve core is used for the regulating cut-off type, which meets the leakage standard of level Ⅵ (zero leakage).

  • The servo amplifier adopts deep dynamic negative feedback, which can improve the automatic adjustment accuracy.

  • The bellows seal type regulating valve completely seals the moving valve stem to prevent fluid leakage.

  • The electronic type electric regulating valve can directly control the valve opening by the current signal without a servo amplifier.

Maintenance and maintenance of electric single-seated control valve

Improper installation of industrial valves can cause huge waste and failures, while proper installation can ensure normal operation and prolong service life, reduce maintenance workload, and obtain good system control performance. Utmostvalve control valve factory will show you the right maintenance of single seated control valve.

Overall considerations for valve installation should consider the following aspects:

① Safety: Safety of personnel and equipment during installation.

② Control performance: The pressure loss of the piping system should be consistent with the pressure loss considered when calculating the size of the regulating valve to ensure the required flow characteristics. Inlet and outlet should ensure sufficient straight pipe sections.

③ Installation position: There should be sufficient space for manual operation of the single-seated control valve and accessories (including bypass operation) and to ensure the possibility of on-site disassembly and maintenance of the valve.

④ Regulating valve group: Generally, the bypass valve with the shut-off valve is installed in the process piping to be matched with the regulating valve to meet the needs of continuous operation of the equipment. Use the shut-off valve to isolate when maintaining the regulating valve. Use the bypass valve for adjustment.

Field installation

The installation personnel should first realize that the regulating valve is a precise instrument and equipment, and should avoid collisions and falls to prevent damage. Pay attention to the following:

① The valve should preferably be installed upright and vertically on the pipeline. If the valve is heavy or there is vibration, a support bracket should be added.

② The valve body should avoid excessive stress due to serious differences in front and back piping or flanges.

③ Before first starting and after shutdown for maintenance, the piping system should be flushed and then the single-seated control valve installed. Alternatively, install a filter before the valve.

④ The regulating valve must be installed according to the direction of the flow arrow on the valve body.

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