Our firm introduced whole set of good-sized numerical control hydraulic
folding equipment(1280/16000) as well as equipped with a series of
good-sized professional equipments of armor plate-flatted machine,
lengthways cut machine, numerical control cut machine, auto-closed up
machine, auto-arc-weld machine, hydraulic redressing straight machine,
etc. The firm produces all sorts of conical, pyramidal, cylindrical
steel poles with production range of dia 50mm-2250mm, thickness
1mm-25mm, once taking shape 16000mm long, and large-scale steel
components. The firm also is equipped with a multicolor-spayed
pipelining. At the meantime, for better service to the clients, our firm
founded a branch com. The Yixing Jinlei Lighting Installation Com,
which offers clients a succession of service from design to manufacture
and fixing.
We have supplied 2400ton 132kV and 220kV transmission line steel pole to WAPDA. Pakistan on 2008 and have supplied 1200ton 138kV transmission line steel pole to Davao light, Philippines on 2009.
Street Lighting Pole, Solar Power, Solar Lighting Pole Jiangsu Xinjinlei Steel Industry Co., Ltd. , https://www.jinleisteelpole.com
Purchase valve technical requirements and skills
Procurement valve technical requirements and skills: First, the general requirements:? 1, valve specifications and categories should be consistent with the requirements of the pipeline design documents. 2, the type of valve should be marked on the basis of GB number requirements. If the enterprise standard, should indicate the relevant description of the model. 3, the working pressure of the valve, the required working pressure of the pipeline, without affecting the price of the premise, the valve can withstand the pressure should be greater than the actual working pressure of the pipeline; the valve closed condition on either side should be able to withstand 1.1 times the valve Pressure value, without leakage; valve open condition, the valve body should be able to withstand the pressure twice the valve requirements. 4, valve manufacturing standards should be based on the national standard number, if the enterprise standards, procurement contracts should be accompanied by corporate documents. Second, the valve material: 1, the valve material: As the gray cast iron pipe is not recommended, the valve body material should be mainly ductile iron, and indicate the actual physical and chemical testing of castings and castings. 2, the stem material: stainless steel stem (2CR13), large-diameter valve should also be stainless steel embedded valve stem. 3, nut material: the use of cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem. 4, stem bushing material: its hardness and strength should not be greater than the stem, and in the water soaking conditions with the stem, the valve body does not form electrochemical corrosion. 5, the sealing surface of the material: ①different types of valves, sealing methods and material requirements vary; ② ordinary wedge gate valve, copper ring material, fixing methods, grinding methods should be described; ③ soft seal gate valve plate lining Plastic materials, physical and chemical and health testing data; ④ butterfly valve should be marked on the sealing material on the valve body and sealing material on the disc; their physical and chemical testing data, especially the rubber hygiene requirements, anti-aging properties, wear resistance; Usually used NBR rubber and EPDM rubber, non-doped with recycled rubber. 6, the valve shaft packing: ①due to the valve in the pipe network, usually not frequently open and close, requiring filler inactivity within a few years, the filler is not aging, long-term sealing effect; ② valve shaft packing should also bear frequent In case of opening and closing, the seal effect is good; ③ In view of the above requirements, the valve shaft packing should be replaced for life or not replaced for more than ten years; ④ If the packing needs to be replaced, the valve design should consider measures that can be replaced under water pressure. Third, the gear box :? 1, the material inside and outside the cabinet and anticorrosive requirements consistent with the principle of the valve. 2, the box should be sealed, the box assembly can withstand 3 meters of water column status immersion. 3, the opening and closing limit on the box device, the adjustment nut should be in the box. 4, the transmission structure design is reasonable, when the opening and closing can only drive the valve shaft to rotate, not to make it move up and down, transmission components bite moderately, do not produce separation and slipping with the load hoist. 5, variable speed transmission box and valve shaft seal can not be connected into a whole without leakage. 6, no debris inside the box, the gear occlusion should have grease protection. Fourth, the valve operating mechanism: 1, the valve opening and closing direction of operation, should be closed clockwise. 2, due to the valve in the pipe network, often manual opening and closing, opening and closing speed should not be too much, that is, large-diameter valves should be within 200-600 turn. 3, in order to facilitate a person's opening and closing operations, the plumbing pressure conditions, the maximum opening and closing torque should be 240m-m. 4, the valve opening and closing operation side should be square tenon, and size standardization, and facing the ground, so that people can directly operate from the ground. Valves with wheels are not suitable for underground pipe networks. ? 5, the degree of opening and closing of the valve display? ①valve opening and closing of the scale line, should be cast in the gearbox cover or change the direction of the display panel after the shell, all toward the ground, the scale brush phosphor to Showing eye-catching;? ② indicating the material of the needle in the management of better use of stainless steel plate, or painted steel, do not use aluminum production;? ③ indicating needle eye-catching, fixed firmly, once the opening and closing adjustment accuracy After the rivet should be locked. 6, If the valve is buried deep, the operating mechanism and the display panel from the ground when the distance ≥ 15m, should be equipped with additional rod facilities, and fixed firmly, so that people from the ground to observe and operate. In other words, pipe network valve opening and closing operation, should not go down to work. Fifth, the valve performance testing:? 1, a batch of valves manufactured in a batch, authoritative agencies should be commissioned for the following performance testing :? ①valve opening and closing torque under conditions of working pressure;? ② working pressure conditions, Can ensure that the valve close tight continuous opening and closing times; ③ valve in the pipeline water flow resistance coefficient of the test. 2, the valve should be carried out in the factory the following tests:? ①valve in the open condition, the valve body should withstand pressure twice the internal pressure detection;? The valve in the closed condition, both sides were 11 times Valve pressure value, no leakage; but the metal seal butterfly valve, the leakage value is not greater than the relevant requirements. Six, the valve inside and outside corrosion: 1, the valve body (including the variable speed transmission box) inside and outside, the first shot blasting sand rust, and strive to electrostatic spray powder non-toxic epoxy resin, the thickness of 0? 3mm above. Extra-large valve electrostatic spraying non-toxic epoxy resin difficulties, should also be brushing, spraying similar non-toxic epoxy paint. 2, all parts of the valve body and the valve plate require a full anti-corrosion, on the one hand soaked in water will not rust, electrochemical corrosion between the two metals does not produce; two smooth surface so that water resistance decreased. 3, the body of anti-corrosion epoxy resin or paint the health requirements, there should be the corresponding authority of the test report. Chemical and physical properties should also meet the relevant requirements. Seven, the valve packaging and transportation: 1, the valve should be set on both sides of the light blocking plate solid seal. 2, medium and small-diameter valves should be tied with straw, and transport by container is appropriate. 3, large-diameter valves are also simple wooden frame retention packaging, in order to avoid collision damage during transport. Eight, the valve factory manual: The valve is a device, in the factory manual should be marked with the following relevant data:? Valve specifications; Model; Working pressure; Manufacturing standards; Body material; Stem material; Sealing material; Valve material; Lever bushing material; inside and outside the anti-corrosion material; operation start direction; revolutions; opening and closing torque under working pressure conditions; manufacturer's factory name; factory date; factory number; weight; connecting flange aperture, the number of holes, ; Graphically indicate the overall length, width, height control size; valve flow resistance coefficient; effective opening and closing times; valve factory inspection of the relevant data and installation, maintenance precautions. This article Keywords: valve