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How Do We Use and Install Butterfly Valve

Installation of Butterly Valve

Applicable occasions

Butterfly valves are suitable for flow regulation. As butterfly valves have relatively high-pressure losses in the pipeline, we should also consider the robustness of the butterfly plate to withstand the pressure of the pipeline medium when closed. In addition, we must also consider the working temperature limits that the resilient seat material can withstand at high temperatures. Butterfly valves have a small construction length and integral height.. It opens and closes quickly and has good fluid control characteristics. The structural principle of the butterfly valve is best suited to making large-diameter valves. When butterfly valves are required for flow control, it is most important that the correct size and type of butterfly valve is selected, which allows it to work properly and efficiently.

Typically in throttling and regulating control of slurry media, we require short construction lengths and fast opening and closing speeds (1/4 turn). In low-pressure shut-off (slight differential pressure), we recommend butterfly valves.

In the case of double-position regulation, indented ground passages, low noise, cavitation and cavitation, and a small leakage to the atmosphere, as well as in the case of abrasive media, we can choose butterfly valves.

Suppose the need to achieve throttling regulation under special conditions or the requirement for strict sealing, as well as in severe wear, low temperature (deep cold), and other states need to use the butterfly valve. In that case, we need to use a unique design of metal sealing with an adjustment device and three eccentric or double eccentric special butterfly valves.

Butterfly valves are suitable for applications where a complete seal is required and where the gas test leakage is zero. We also recommend using butterfly valves for fresh water, sewage, seawater, salt water, steam, natural gas, food, pharmaceuticals, oil, acids and alkalis, and other pipelines with high life expectancy and working temperatures from -10°C to 150°C.

The soft seal eccentric butterfly valve is suitable for opening, closing, and regulating the ventilation and dust removal pipeline in both directions. It is widely used in metallurgy, light industry, electric power, petrochemical systems for gas pipelines and waterways, etc.

A metal-to-metal wire-sealed double eccentric butterfly valve is suitable for city heating, gas supply, water supply, and other gas, oil, acid, and alkali pipelines. In addition, it can be used as a regulating and throttling device.

Metal-to-metal face-sealed triple eccentric butterfly valve can be widely used in petroleum, petrochemical, chemical, metallurgy, electric power, and other fields, in addition to being used as a program control valve for large pressure change adsorption (PSA) gas separation devices. It is an excellent alternative to gate valves and globe valves.  

Common faults

The rubber elastomer in butterfly valves can tear, wear, age, perforate or even fall off in continuous use. And the traditional hot vulcanization process is challenging to adapt to on-site repair needs. And then repair to use special equipment needs to consume a lot of thermal and electrical energy, which is time-consuming and laborious. The superior adhesion and excellent resistance to abrasion and tearing of BCST products ensure that the repair can meet or exceed the requirements of the traditional method. It ensures that the service life of the repaired part is met or exceeded by the new one. It also significantly reduces downtime.

Installation and maintenance

  1. During installation, we should stop the valve flap in the closed position.
  2. In the opening position, we should determine the butterfly plate’s rotation angle according to the butterfly plate’s rotation angle.
  3. If it is a butterfly valve with a bypass valve, we should open the bypass valve before opening.
  4. We should install it according to the manufacturer’s installation instructions. If it is a butterfly valve with a large weight, we should set a firm foundation.

Construction and installation points

1.The installation position, height and direction of inlet and outlet of the valve must be in accordance with the design requirements. The connection of the valve should be firm and tight.

2.For All kinds of manual valves installed on the insulation pipeline, the handle shall not be down.

3.We must install valves before the appearance of inspection. The nameplate of the valve should accord with the provisions of the current national standard “General Valve Marking” GB 12220. For working pressure greater than 1.0 MPa and in the main pipe to cut off the role of the valve, before installation should be a strength and tightness performance test. After passing, the valve is allowed to use. In the strength test, the test pressure for the nominal pressure is 1.5 times, and the duration is not less than 5 min. Valve shell, packing, and no leakage are considered qualified. In the tightness test, the test pressure is 1.1 times nominal. Test pressure in the test duration should align with GB 50243 standard requirements. If there is no leakage on the sealing surface of the valve flap, it is considered qualified.

Installation matters

The butterfly valve is simple, small, and light in weight. Its components are also relatively few, and a few parts make up the butterfly valve. It is also straightforward to use when opening, simply selecting the switch to ninety degrees. The butterfly valve has excellent fluid control and can increase or decrease the flow at any time. However, valves have a certain amount of resistance when transporting any fluid. And the resistance of a butterfly valve comes mainly from itself, such as the thickness of the butterfly valve body. If you want to reduce the opposition to the fluid, you just need to reduce its viscosity.

Resilient seals have the disadvantage of being limited by temperature.

Butterfly valves are also used in a wide range of applications. If they are used to control the flow, different types and body sizes are required. The butterfly valve itself is designed to be suitable for valves with a large bore. Butterfly valves are not only extensively used in general industries such as petroleum, natural gas, chemical and water treatment. And it is also used in the cooling water system of thermal power stations.

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