Burner valve housing material selection

According to the use of pressure gas pipeline, a reasonable selection of the burner valve housing material, both to meet the safe operation of the pipeline but also to reduce the cost and make the best use of the purpose. 1) Pressure Class B (12MPa) following transmission and distribution lines, gray cast iron burner valves are recommended, its biggest advantage is good corrosion resistance, and cheap, very suitable for underground pipelines. 2) Class B high pressure (18MPa) or less, and even medium voltage class A (014MPa) below, suggested the use of ductile iron or cast steel stove valves, focusing on recommended use ductile iron. For example: ductile cast steel grades QT400218 grades compared with WCB, the mechanical properties of the former than the latter is not, and corrosion resistance and are superior to steel casting process, the price is lower than steel (usually cast of 70 % or so). So ductile iron burner valves are superior overall performance and price cast steel burner valves, the pressure within the range of choice as ductile iron Propane Control Valve, but with particular attention to monitoring the quality of ductile material. 3) A high pressure level (116MPa) or higher pressure level, suggested the use of cast steel burner valves, burner valve manufacturing 4MPa pressure below the level, generally used WCB grades. 4) In recent years, the country began using PE gas pipes, PE pipes currently used in 014MPa pressure level below. PE ball has come out, the series gas Burner Valve can be buried, better sealing performance. But the current high price of PE ball, especially larger than 100mm diameter ball over.

Underground pipe network gas burner valve requirements:

Gas gas burner valve installed in the underground pipe network should be able to withstand the maximum pressure within the gas transmission and distribution pipelines, more importantly, must have sufficient rigidity to withstand the underground pipe network that is subject to a variety of external forces can maintain the gas burner Burner Valve does not deform reliably ensure the sealing performance of the gas burner valve. 1) to minimize the height of the gas burner valve structure (refer to section centerline of the flow gas burner valve to the height of the top of the gas burner valve), to reduce the pipe depth. 2) at the top of the gas burner valve should be fitted with fully enclosed hoist indicator, easy to check the status of the gas burner valve which is an important condition for safe operation. 3) Full bore design, reduce flow resistance, easy cleaning through a pipe or duct detectors, but also to meet constantly lose enclosed tapping machine openings in the pipeline. 4) reliable sealing performance, soft seal gas burner valve 111 times the nominal rated working pressure is not allowed inside any noticeable leak, hard seal gas Burner Valves 111 times the nominal rated leakage within the allowable operating pressure of less than 13DNmm3 / s. This requirement is more stringent, such as: 500mm nominal inside diameter gas gas burner valve leakage amount can not exceed 9ml / min, external leakage is absolutely not allowed. 5) used in the gas gas burner valve casing underground pipe network should be corrosion resistant, suggested a different shell material according to the medium and the use of pressure pipelines. 6) The design of the gas burner valve components should be considered low-maintenance or maintenance-free construction, repair and maintenance to minimize the workload, reducing gas burner valve repair and maintenance due to the impact of traffic and closed roads. 7) the vast majority of artificial underground pipeline gas burner valves open and close, open and close the Stove Top Burner Valve torque requirement is small, the number of full circles reasonable, after the accident as soon as possible to cut off the gas supply. 8) our urban roads under various pipelines crowded, complex, not excavated basement cellar well, it is recommended Buried gas burner valves.

The packing and shipping of gas safety burner valve

gas oven safety valve should be located on both sides of light blocking plate solid seal.

Medium and small-caliber gas safety burner valve should be tied to rope, and transported to suitable container.

Large diameter gas safety burner valves are also simple wood frame solid packaging to avoid collision damage during transport.

gas safety burner valve factory specification

gas safety burner valve is a device in the factory manual should indicate the following data: Natural Gas Safety Valve specifications; Model; working pressure; manufacturing standards; body material; Stem material; sealing material; gas safety burner valve shaft packing material; stem sleeve material; internal and external corrosion-resistant materials ; operation Starting direction; revolutions; hoist pressure in the working condition moment; factory Changming; release date; serial number; weight; connecting flange apertures, number of holes, the center of the pitch; the manner shown marked overall length , width and height of the control dimension; gas safety burner valve flow resistance coefficient; effective opening and closing times; gas safety gas safety burner valve factory testing of the relevant data and installation, maintenance precautions

Burner Valve Performance Testing

1. burner Valve Performance Testing

1.1 Gas Burner Safety Valve of a standard volume manufacturing, should be entrusted to an authoritative organization for testing the performance of the following: ① burner Valve pressure in the working conditions of the opening and closing torque; ② pressure in the working conditions, to ensure the burner Valve is closed tight opening and closing times in a row; ③ burner Valve flow resistance coefficient detected at aqueduct conditions.

1.2 burner Valve at the factory should be carried out to detect the following: ① burner Valve in the open position, the Burner Valves shall be subjected to internal pressure is detected twice the value of the working pressure burner Valve; ② the closed condition of the burner Valve, both sides were to withstand 1.1 times the value of the working pressure burner Valve no leakage; but the metal sealing butterfly burner Valve, leakage is no greater than the relevant requirements.

2. burner Valves and external corrosion

2.1 body (including the variable speed transmission box) inside and outside, first, blasting sand blasting, seek non-toxic epoxy powder electrostatic spraying, the thickness of 0.3mm or more. Large electrostatic spraying toxic epoxy resin burner Valve difficulty should brush, spray similar to non-toxic epoxy paint.

2.2 as well as all parts of the body inside the burner Valve plate calls for a comprehensive anti-corrosion, on the one hand immersed in water will not rust, does not produce galvanic corrosion between the two metals; two aspects of a smooth surface to reduce drag through the water.

2.3 Range Dual Safety Valves body paint anti-corrosion epoxy resin or health requirements, should detect the appropriate authority of the agency report. Chemical and physical properties should meet the relevant requirements.

The gas burner Valve operating mechanism

1.1 Gas burner Valve opening and closing operation direction, and all should be clockwise closing.

1.2 As the pipe network in the gas Burner Valves, often manually opening and closing, opening and closing rotation should not be too much, that is, large diameter gas burner Valves should be transferred within 200-600.

1.3 In order to facilitate opening and closing operation of a person under the plumber pressure conditions, the maximum torque should open and close 240N-m.

1.4 Gas burner gas safety burner valve opening and closing operation should end mortise and tenon, and the size standard, and facing the ground, so that people can be directly manipulated from the ground. With a wheel gas burner Valve does not apply to underground pipe network.

1.5 degree of gas Range Valves opening and closing the display panel: ① gas burner Valve opening and closing degree of scale line should be cast in the gearbox cover or change the direction of the display after the disc casing, all for the ground wire brush on the phosphor scale to show striking ; ② direct needle plate material in the better management of available stainless steel case, otherwise the painting of steel, do not use aluminum leather production; ③ direct drive needle eye-catching, stable fixation, accurate adjustment once the opening and closing, should be rivets locked.

1.6 If the gas burner Valve buried deeper, the operating mechanism and display the distance from the ground ≥1.5m, pole should have added facilities and fixed rate stability for the people observe and operated from the ground. That is, the pipe network in the gas burner Valve opening and closing operation, should not go down operations.

Purchasing the necessary technical factors to consider preservative Gas safety burner valve

   Only clear specifications, type, working pressure on the Gas safety burner valve procurement practices to meet the procurement requirements in the current market economy environment is imperfect. Because the Burner Valve manufacturer for the next competition, each Gas safety burner valve were unified design concept, with different innovations, formed their own corporate standards and product personality. Therefore, when the Gas safety burner valve procurement more detailed technical requirements, coordination with manufacturers to reach a consensus, as an annex to the Gas safety burner valve procurement contracts is essential.

1. General requirements

1.1 specifications and types of Gas safety burner valves, piping design should meet the requirements documents.

1.2 Gas safety burner valve models should be specified in accordance with national standard code requirements. If the enterprise standards, instructions should indicate models.

1.3 Gas safety burner valve job pressure ≥ pipeline working pressure, without affecting the price of the premise, the gas safety burner valve can withstand working pressure should be greater than the actual working pressure pipeline; either side of the Gas safety burner valve closing situations should be able to withstand 1.1 times the working pressure Gas safety burner valve values without leakage; Gas safety burner valve open position, the Gas safety burner valve should be able to withstand twice the working pressure Gas safety burner valve requirements.

1.4 Gas safety burner valve manufacturing standards, should explain the basis of the national standard code, if the file should be attached to business enterprise standards, procurement contract.

2. gas Burner Valves standard quality

2.1 Body material shall be ductile iron main, and indicate grades and iron actual physical and chemical test data.

2.2 stem material, and strive to stainless steel stem (2CR13), large diameter Gas safety burner valves should also be embedded in the package of stainless steel stem.

2.3 nut material, cast brass or aluminum bronze, and the hardness and strength are greater than the stem.

2.4 stem bushing material, its hardness and strength shall be not greater than the stem, and is immersed in water conditions and Gas safety burner valve body is not the formation of electrochemical corrosion.