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Gost valve installation requirements

 Gost ball valves supplier shares your valve installation requirements
1: 1. Before the valve is installed, carefully check whether the model and specifications of the valve are consistent with the design; 2. Check whether the valve can be used under the required conditions according to the valve model and the factory manual; 3. When the valve is hoisted, the rope Should be tied to the flange connection of the valve body and bonnet, and should not be tied to the hand wheel or valve stem, so as not to damage the valve stem and hand wheel; 4, when the valve is installed on a horizontal pipeline, the valve stem should be vertically upward, Allow the valve stem to be installed downwards; 5. When installing the valve, do not use the forced counterpart connection method, so as to avoid damage due to uneven force; 6, should not be installed in the underground wet valve to prevent stem corrosion.
Two: Assembly requires cleaned parts must be sealed for installation. The requirements for the installation process are as follows: 1. The installation workshop must be clean, or a temporary clean area must be set up, such as using a newly purchased color strip or plastic film to prevent dust from entering during the installation. 2. The assembly workers must be wearing clean cotton work clothes, wearing a cotton cap, hair should not leak, wearing clean shoes, wearing plastic gloves in hand, and degreasing. 3. The assembly tools must be degreased and cleaned before assembly to ensure cleanliness.
III: Acceptance requirements Acceptance follows HG 20202-2000 "Code for Construction and Acceptance of Degreasing Projects". Before assembly, each component is wiped with clean precision filter paper. The dead corner of the component is selected, and the color of the filter paper is acceptable. Four: valve specifications and category requirements 1, the model of the valve should indicate the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated. 2. The working pressure of the valve should be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline. 3. The national standard number of the valve manufacturing standard should be stated. If it is an enterprise standard, the enterprise contract should be attached to the purchase contract.

 Cast Steel Ball Valve 


Five: Valve performance testing requirements 1. When a valve is manufactured in a certain specification, authoritative agencies should be entrusted to perform the following performance testing: ① the opening and closing torque of the valve under the working pressure condition; ② the flow of the valve under the pipeline water delivery condition Detection of resistance coefficient. 2. The valve should be tested as follows before leaving the factory: ① When the valve is open, the valve body should withstand the internal pressure detection of twice the valve's working pressure value; ② When the valve is closed, the two sides of the valve are subjected to 11 times the valve's working pressure. Value, no leakage; but the metal sealed butterfly valve, the leakage value is not greater than the relevant requirements.

Six: sealing requirements the sealing performance of the valve refers to the ability of each sealing part of the gost ball valves to prevent the leakage of the medium. It is the most important technical performance index of the valve. There are three sealing positions of the valve: the contact between the opening and closing member and the two sealing surfaces of the valve seat; the fitting of the packing with the valve stem and the stuffing box; and the connection between the valve body and the valve cover. The previous leak is called internal leakage, which is commonly known as improper closing, which will affect the valve's ability to intercept the medium. For shut-off valves, internal leakage is not allowed. The latter two leaks are called external leaks, that is, the medium leaks from the inside of the valve to the outside of the valve. Leakage can cause material loss, pollute the environment, and cause accidents in severe cases. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the valve must have reliable sealing performance.
Seven: Other requirements 1. The cast steel ball valve after assembly is purged with nitrogen for at least 1 minute. 2. The airtight test must use pure nitrogen. 3. After the airtight test is qualified, it is sealed and sealed with a clean polyethylene cap. The polyethylene cap should be soaked in organic solvents and wiped clean before use. 4. Seal with vacuum bag. 5. Finally packing. 6. Take measures to ensure that the package is not damaged during transportation.

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