1. The operating mechanism of the valve
1.1 the open-close direction of valve operation, all should be clockwise. 1.2 because the network of the valve, is often of artificial opening and closing, opening and closing of revolution shoulds not be too much, is the large diameter valves also should be within 200-200 RPM. 1.3 for the purposes of a person is opening and closing operation, the plumber pressure state, the biggest open-close torque appropriate for n - 240 m. 1.4 the valve opening and closing operation side should be square tenon, and size of standardization, and geared to the needs of the air, so that people can indirectly operation from the air. Valve is not practical in the public network with roulette. 1.5 display panel (1) the level of opening and closing of the valve opening and closing valve calibration, the level of cover should be cast in the transmission or conversion direction after the show plate shell, all the air, the scale line brush on phosphor powder, as a prominent; (2) guide plate material in the governance of good condition available stainless steel plate, or paint for steel plate, do not use aluminum leather manufacturing; (3) to guide the needle plate, fixed and reliable, and once the open-close control right, the rivet lock. 4.6 if the valve buried deep, operating mechanism and the display panel interval acuity 1.5 m away from the air, should be equipped with extension rod device, container parts and fixed in mind, so that people on inspection and operation from the air. That is to say, the valve opening and closing operation in pipe network, unfavorable under operation.
2. Performance test of the valve
2.1 a valve specifications and batch manufacturing, prestige sex institutions entrusted to test the performance of the following: (1) the valve open-close torque under working pressure condition; (2) under working pressure condition, can guarantee the valve closed a continuation of the opening and closing times; (3) the flow resistance coefficient of valve in the pipeline state detection. 5.2 valve should be done before they go out the following tests: (1) the valve in open state, the body should take 2 times the internal pressure of valve working pressure value detection; (2) of the valve closed condition, on both sides of the break up from 1.1 times the working pressure of valve value, no leakage; But the metal sealing butterfly valve, leakage nor a value greater than coherent request.
3. The internal and external anti-corrosion of the valve
3.1 body (including variable speed drive box) inside and outside, should first deoxidization blasting derusting, tried to electrostatic spraying powder non-toxic epoxy resin, the thickness of 0.3 mm and above. Oversize valve electrostatic spraying non-toxic epoxy resin have difficult, should also be similar non-toxic epoxy paint brush, spraying. 3.2 body external parts request partial corrosion as well as the valve plate, on the one hand, soak in the water will not rust, does not occur between two metal electrochemical erosion; Two aspects of surface smooth increase water resistance. 3.3 body health request of anticorrosive epoxy resin or paint, prestige to organ shall have the corresponding inspection report. Chemicals can also should agree with coherent request.
4. The valve packing and shipping
4.1 the valve should be set on both sides of lightweight boards to the enclosed. 4.2 and small-bore valves should with straw rope tied, and method of container transport as appropriate. 4.3 large diameter valves also have hard wood frame solid packing, lest the transportation process of clash.
5. The valve factory explain the book
Valve is equipped in the factory to explain the book should show the following coherent data: the valve specifications; Model; Task pressure; Manufacturing specifications; The valve body material; Stem material; The sealing material; Valve shaft packing material; Stem bushing material; Internal and external anti-corrosion materials; Start operation direction; Revolutions; Open-close torque under the working pressure; Factory name; Manufacture date; Factory number; Component; Connecting flange of the aperture, the number of holes, the central pitch; With graphic method show that the overall length, width and height control size; The valve flow resistance coefficient; Effective number of opening and closing; Valve factory testing the coherence of data and installation, protection of note, etc.