It should be noted that when the valve Purchasing What are the technical requirements (b)

Often manual hoist, hoist a few should not be too much change, that is, large-diameter valves to be within the 200-600.



? 4.3; In order to facilitate a person's gate operation, under pressure in the plumbing, the biggest gate for the moment wish to 240m-m.



4.4; gate valve operation should be to end mortise and size standardization, and for the ground so that people can be directly from the ground operation. Roulette with the valve does not apply to the underground pipe network. ?



4.5; shows the extent of the valve gate plate



① scale degree of the valve gate line, should be sealed with casting or conversion in the gearbox after the show the direction of the shell on the plate, all for the ground, brush on the phosphor calibration line in order to show that eye-catching;? ② instructions needle plate better in the management of the material circumstances of the stainless steel plate can be used, otherwise the plate for the painting, not to use the production of aluminum skin;? ③ instructions striking needle plate, fixed solid, accurate adjustment once the gate should be locked in order to rivet



4.6; if planted deeper valve, operation and display the distance from the ground plate ≥ 1? 5m, the pole should have added facilities, and fixed firmly stabilized so that people from the observation and operation of the ground. In other words, the pipe network in the gate valve operation, not to go down operations. ?



5? Valve performance testing?



5.1; valve when a certain volume manufacturing specifications, should be entrusted to an authoritative body of the detection of the following properties:? ① pressure valve in the situation of workers under the torque of the hoist;? ② pressure in the work situation, to ensure tight valve closure the number of consecutive headstock; ③ valve in the pipe under the condition of the detection of flow resistance coefficient.



5.2; valve at the factory before the detection of the following:? ① valve in open conditions, the valve body should be subject to twice the value of work pressure testing of the internal pressure; ② valve closing conditions, to bear on both sides of the respective 1? 1 times the work pressure valve, no leakage; but metal sealed butterfly valve, leakage is no greater than the value of the relevant requirements of



6? Valve internal and external corrosion?



6.1; body (including the variable-speed transmission box) inside and outside, first sand shot blasting rust clearance to electrostatic spraying epoxy resin powder non-toxic, thickness 0? 3mm or more. Spray large non-toxic epoxy electrostatic valve difficulties, they should also Brush, spray similar to the non-toxic epoxy paint.



6.2; the valve body as well as every part of a comprehensive anti-corrosion requirements, on the one hand immersed in water will not rust, between two non-metal electrochemical corrosion; two aspects to enable a smooth surface to reduce water resistance.



6.3; valve body or anti-corrosion epoxy resin paint health requirements, the authority should have the corresponding organs of the testing report. Physical properties of the chemical should be in line with the relevant requirements. ?



7? Valve transport packaging?



7.1; valves on both sides should be solid light blocking plate closure. ? Medium and small-caliber valve should be bundled straw, and container transport is appropriate.



7.3; large diameter valves are also simple framework for solid wood packaging to prevent damage during transport collision



8? Valve factory manual?



Valve equipment in the factory specification should be marked with the following data:? Valve specifications; models; work pressure; manufacturing standards; body material;; stem material; seal material; valve shaft packing material; stem sleeve material ; internal and external anti-corrosion material; direction start operation; rotation; workers hoist torque under pressure;



Make factory; factory date; factory code: weight; connecting flange of the aperture, hole number, the Center Distance



Icon indicating the way to the overall length, width and height dimensions of control; the number of effective gate



Valve flow resistance coefficient; valve factory testing and installation of the relevant data, such as the maintenance of attention. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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