D363H Triple Eccentric Welding Butterfly Valve

The electric regulating butterfly valve is a type within the categories of electric valves and electric regulating valves. The main connection methods include: flanged and wafer types. It is an important actuation unit in the field of industrial automation control. Two major analyses of the installation points for electric regulating butterfly valves: the installation position, height, and direction of inlet and outlet must comply with design requirements, and attention should be paid to ensuring that the direction of medium flow is consistent with the arrow direction marked on the valve body; connections should be firm and tight. Before installation, the electric regulating butterfly valve must undergo an appearance inspection, and the valve's nameplate should comply with the current national standard "General Valve Markings" GB12220. For valves with a working pressure greater than 1.0 MPa and those that serve as shut-off valves on main pipelines, strength and tightness performance tests should be conducted before installation. They can only be used after passing the tests. During the strength test, the test pressure should be 1.5 times the nominal pressure, with a duration of not less than 5 minutes; the valve body and packing should show no leakage to be considered qualified. Electric regulating butterfly valves can be classified by structural form into offset disc, vertical disc, inclined disc, and lever types. By sealing form, they can be divided into soft seal and hard seal types. Soft seal types generally use rubber ring seals, while hard seal types typically use metal ring seals.

Selection Rules

Stem diameter: For multi-turn rising stem valves, they cannot be assembled into electric valves. Therefore, if the maximum stem diameter allowed by the electric butterfly valve device cannot pass through the stem of the matched valve, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the rising stem valve's stem. For partial-turn valves and non-rising stem valves among multi-turn valves, although the stem diameter passage issue does not need to be considered, the stem diameter and keyway dimensions should still be fully considered during selection to ensure normal operation after assembly.

Operating torque: Operating torque is the main parameter for selecting an electric valve actuator. The movement process of the electric butterfly valve can be controlled by stroke, torque, or the magnitude of axial thrust. Since the operating characteristics and utilization rate of the electric valve actuator depend on the type of valve, the operating specifications of the device, and the position of the valve in the pipeline or equipment, the electric butterfly valve actuator is an indispensable device for achieving valve program control, automatic control, and remote control. Therefore, correctly selecting the electric valve actuator is crucial to prevent overload (operating torque higher than the control torque). Typically, the basis for correctly selecting the electric butterfly valve actuator is:

The output torque of the electric actuator should be 1.2-1.5 times the maximum operating torque of the valve.

Electric butterfly valve operating thrust: There are two main structures of the electric valve actuator: one is without a thrust disc, where the output torque is converted into output thrust through the stem nut in the thrust disc; the other is with a thrust disc, which directly outputs torque.

Number of output shaft rotations: The number of rotations of the output shaft of the electric valve actuator is related to the nominal diameter of the valve, the stem pitch, and the number of thread starts. H is the valve opening height, calculated as M = HZS (where M is the total number of rotations the electric actuator should satisfy, S is the stem drive thread pitch, and Z is the number of stem thread starts). When placing an order, please specify:

I. 1. Product model 2. Nominal diameter DN, rated flow Kv 3. Signal pressure, spring range 4. Flow characteristics 5. Inlet and outlet pressure 6. Medium type 7. Medium operating temperature range 8. Valve body and plug sleeve material 9. Whether accessories are included, specify model 10. Any other special requirements

II. If the valve model from our company has already been selected by the design unit, please place your order directly with our sales center based on the valve parameters.

III. When the application is critical or the environment is complex, please provide design drawings and detailed parameters. Our engineering experts will carefully review and analyze them for you.