Solenoid valve procurement only clear the specifications, types, pressure to meet the procurement requirements of the practice in the current market economy environment is imperfect. Because the valve manufacturer in order to compete for the product, each in the valve under the concept of a unified design, different innovations, formed their own corporate standards and product personality. Therefore, when the valve procurement more detailed technical requirements, and manufacturers to obtain consensus, as the annex to the valve procurement contract is necessary. 1. General requirements 1.1BURKERT solenoid valve specifications and categories should be consistent with the requirements of the pipeline design documents. 1.2BURKERT solenoid valve model should be marked on the basis of the national standard number requirements. If the enterprise standard, should indicate the relevant description of the model. 1.3BURKERT solenoid valve working pressure, the required working pressure of the pipeline, without affecting the price of the premise, the valve can withstand the working pressure should be greater than the actual pipeline pressure; valve closed condition should be able to withstand 1.1 times on either side Valve work pressure value without leakage; BURKERT solenoid valve is open, the valve body should be able to withstand the pressure twice the valve requirements. 1.4BURKERT solenoid valve manufacturing standards should be based on the national standard number, if the enterprise standard, the procurement contract should be attached to the corporate documents. 2.BURKERT solenoid valve valve quality 2.1BURKERT solenoid valve body material, ductile iron should be based, and indicate the grades and the actual physical and chemical test data of cast iron. 2.2BURKERT Solenoid valve stem material, stainless steel stem (2CR13), large diameter valve should also be stainless steel valve stem embedded. 2.3 nut material, the use of cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem. 2.4BURKERT Solenoid valve stem bushing material, the 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. 2.5 sealing surface material: ① different 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, valve lining rubber material Of the physical and chemical and health testing data; BURKERT solenoid 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 NBR and EPDM rubber, non-doped with recycled rubber. 2.6BURKERT solenoid valve spindle packing: ① due to the valve in the pipe network, usually not frequent opening and closing, requiring filler in a few years inactivity, packing is not aging, long-term sealing effect; ② valve shaft filler should also bear Frequent opening and closing, the sealing effect of the good; ③ In view of the above requirements, the valve shaft filler for life or do not change for more than ten years; ④ packing to be replaced, the valve design should be considered under pressure to replace the measures . 3. Transmission Gearbox 3.1 Material and internal and external anti-corrosion requirements of the body and the same principle. 3.2 boxes should be sealed, the box assembly can withstand 3 meters of water column status soak. 3.3 Box opening and closing limit device, the adjustment nut should be in the box or set in the box, but need special tools to work. 3.4 Transmission structure design is reasonable, when opening and closing can only drive the valve shaft to rotate, do not make it move up and down, transmission components bite moderation, do not produce separation and sliding with load hoist. 3.5 Variable speed transmission box and valve shaft seal can not be connected into a whole without leakage, otherwise there should be reliable anti-stringing measures. 3.6 box body without debris, the gear occlusion should have grease protection. 4.BURKERT solenoid valve operating mechanism 4.1BURKERT solenoid valve opening and closing direction of the valve operation, should be closed clockwise. 4.2 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. 4.3 In order to facilitate a person's opening and closing operation, under plumbing conditions, the maximum opening and closing torque should be 240N-m. 4.4BURKERT solenoid valve valve opening and closing operation end should be square tenon, and size standardization, and facing the ground, so that people from the ground can be directly manipulated. Valves with wheels are not suitable for underground pipe networks. 4.5BURKERT valve opening and closing degree of the solenoid valve display: ① valve opening and closing of the scale line should be cast in the gearbox cover or switch the direction of the display panel after the shell, all toward the ground, the scale brush on the phosphor, In order to show 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 plate eye-catching, fixed firmly, once the opening and closing adjustment is accurate , Should rivet lock. 4.6 If the BURKERT solenoid valve is deeply buried and the operating mechanism and display panel are ≥1.5m away from the ground, extension levers shall be provided and fixed so that people can observe and operate from the ground. In other words, pipe network valve opening and closing operation, should not go down to work.
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