Clear only if the particular control device procurement specifications, type, working difficulty to fulfill the procurement requirements of the practice, while in the market Economy Environment is definitely imperfect. Because that valve producer for any solution competition, each have been in the actual valve beneath the style of unified design, by using numerous innovations, formed their personal provider requirements as well as supplement personality. Therefore, this control device designed procurement more descriptive practical requirements, coordinating having makers to reach a consensus, because valve addition procurement legal agreements is definitely necessary.
1. General prerequisites 1.1 valve dimension and also type of tube have to in accordance with certain requirements involving design and style documents.
1.2 Valve style must show your basis with national standard code requirements. If the particular industry standards, figuring out sorts of instructions.
1.3 control device functioning difficulty pipeline working pressure, without impacting on the price tag on your premise, the actual valve can easily endure the particular working stress ought to be a lot more than this particular water line function pressure; valve final disorders of every area from the control device needs to be qualified to withstand 1.1 instances your doing work strain without leakage value; valve available position, the valve need to be in a position to withstand two times the working difficulty control device requirements.
1.4 control device creation standards, we ought to explain your time frame belonging to the national standard code, when the industry standards, procurement agreements really should be along with business documents.
2. Valve ordinary good quality 2.1 system substance ought to be ductile metal main, in addition to suggest the particular rank along with the actual bodily and also chemical testing involving surefire data.
2.2 come material, as well as shoot for stainless steel originate (2CR13), large diameter valves furthermore should be embedded with offers of stainless steel control device stem.
2.3 nut material, brass, as well as solid aluminum by using cast aluminum bronze, along with the solidity and strength are greater than that valve stem.
2.4 control bushing material, it's hardness along with toughness shall be not a lot more than your stem, and also soaked in drinking water disorders with the actual valve stem, valve shape is not your development with electrochemical corrosion.
2.5 wrapping up surface belonging to the material: different valve type, plugging system and also content requirements vary; everyday wedge gate valve, real estate agent diamond ring materials, fixation methods, polishing ought to note; Soft close up entrance valve, valve eating plan rubber filling resources and also health testing associated with physical and also chemical substance data; valve plugging surface really should be as well as around the entire body securing outside components as well as butterfly aboard material; their particular actual physical in addition to compound test out data, mainly rubber cleanliness specifications getting older resistance, put on resistance; generally NBR and EPDM rubber, blended having recycled rubber is usually purely prohibited.
2.6 control device base packing: As the pipe multilevel within the valves, tend not to open along with nearby frequently, requesting your completing some three years involving inactivity, not really growing older filler, some sort of long-term consequences stay sealed; fill control device the whole length need to carry this typical opening as well as closing, the actual sealing impact belonging to the excellent nature; light on the over requirements, fill valve base would not look for in order to switch or 10 years of life don't change; Packing For replacement, your valve ought to be developed to possess the particular status with water pressure Replacement for the measures.
3. Variable Transmission 3.1 box and the particular bodily and exterior anti-corrosion material prerequisites and entire body principles.
3.2 field should be covered measures, following your cabinet assemblage can face up to the actual disorders involving soaking a few m mineral water column.
3.3 package on the cracking open in addition to closing stopper, along with the shift nut must be within pantry shelves and also located inside the exterior box, nevertheless special equipment need to be working.
3.4 Drive structural style and design to be able to open up as well as close valves can easily merely generate base rotation, in order to not to ever traverse upward and down, bite mild tranny parts, would not develop start plus in close proximity with a load should the spliting up skid.
3.5 Transmission Box Office with the control device the whole length close off leak is just not related whole, and also must have dependable anti-leakage measures string.
3.6 cabinets devoid of debris, grease protection apparel need to chew site.4. Valve running mechanism 4.1 the course of valve opening and also ending operations, will probably be clockwise closing.
4.2 Since the actual control device tube network, normally by hand beginning and closing, opening in addition to termination rotation probably should not be as well much, that is, large-diameter valves needs to be taken within just that 200-600.
4.3 In arrangement to help assist in cracking open along with termination surgery of any person, inside the actual domestic plumbing difficulty conditions, the utmost torque need to open and near 240N-m.
4.4 valves open along with in close proximity operation should conclusion mortise and tenon, and the size standard, plus struggling with the ground to ensure that people today may be immediately manipulated from the ground. With your wheel valve would not apply to underground pipe network.
4.5 degree of valve opening in addition to concluding the particular display plate: your valve best as well as closing level of the level line, should cast the route in the gearbox include or perhaps change that display following your disc casing, almost all struggling with the ground, range cable brush around the phosphor, to signify striking; direct filling device menu material in case connected with better supervision regarding accessible stainless steel, or maybe steel menu with the painting, usually do not make use associated with light weight aluminum skin; one on one generate needle eye-catching, stable fixation, Once this opening along with final resetting accurately, ought to be to rivet lock.
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