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The main points and maintenance of the construction and installation of butterfly valve?

Key Points of Butterfly Valve Construction and Installation

1. Installation location, height, import and export direction must meet the design requirements, and the connection should be firm and tight. 2) All kinds of manual valves installed on the insulation pipeline shall not have downward handles.

2. The appearance inspection must be carried out before the valve is installed. The nameplate of the valve should comply with the current national standard "General Valve Mark" GB 12220. For valves with working pressure greater than 1.0 MPa and cutting off effect on main pipe, strength and tightness test should be carried out before installation, and the valves can be used only after they are qualified. In the strength test, the test pressure is 1.5 times of the nominal pressure, and the duration is not less than 5 minutes. The valve shell and packing should be qualified without leakage. The test pressure is 1.1 times of the nominal pressure in the tightness test, and the test pressure should meet the requirements of GB 50243 standard for the duration of the test, with no leakage on the valve sealing surface as the qualification.

Key Points for Selection of Butterfly Valve Products

1. The main control parameters of butterfly valves are specifications and sizes.

2. The butterfly valve is a single-plate air valve, which has simple structure, convenient processing, low cost and easy operation, but its adjustment accuracy is poor. It is only suitable for the occasion of switch or rough adjustment in the ventilation and air conditioning system.

3. It can be operated manually, electrically or zipper, and fixed at any angle in the range of 90 degrees.

4. Because of the limited bearing capacity of the single-axis single valve plate, the service life of the valve is short under the conditions of high pressure difference and high flow rate. The valve can be divided into closed type and ordinary type, heat preservation and non-heat preservation.

5. The electric butterfly valve has only two-position control, and the electric actuator is the same as the multi-leaf valve.

Installation of butterfly valve

The butterfly valve has simple structure, small volume, light weight and few components. It can be made up of several key components. It is very convenient to open the butterfly valve. It only needs to select the switch to 90 degrees. The butterfly valve has a very good control of the fluid, and can increase or decrease the flow at any time. The valve has certain resistance when it transports any fluid. The resistance of butterfly valve mainly comes from itself, such as the thickness of butterfly valve body. If you want to reduce the resistance to fluid, you only need to reduce the thickness of butterfly valve body.

Elastic seals have temperature limitations.

Butterfly valves have a wide range of applications. If they are used to control flow, different types and sizes of valves need to be chosen, because butterfly valves are more suitable for some large caliber valves when they are designed. Butterfly valves are not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also used in the cooling water system of thermal power plants.


Butterfly Valve Installation and Maintenance:

1. When installing, the disc should stop at the closed position.

2. The opening position should be determined by the rotation angle of the butterfly plate.

3. Butterfly valves with bypass valves should be opened before opening.

4. The butterfly valves with heavy weight should be installed according to the installation instructions of the manufacturer.


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