4. 3 water with slow close check valve body cavity and other metal parts in contact with the water right by using anticorrosive color chip and tightly closed pieces of rubber should be non-toxic no taste. 9 damping slow close check valve, hydraulic control butterfly check valve slowly-closing device should be the supplementary damping medium level of set up monitoring mechanism. 6 slow close check valve check valve disc slow opening out that slowly-closing piston length should be closed all distance is adjustable. 12 hydraulic control butterfly check valve should be set a heavy hammer or accumulator as a side force source and power for semi-automatic to close the valve. 10 the damping slowly-closing valves are not allowed to contain solid particles of raw water, sewage directly into the gradual closing device, such as congestion or damaged tightly closed. After hydraulic device assembly, should implement the performance parameter debugging, and attempt to make it accord with the valve 'slowly-closing' default requirement. 11 hydraulic control butterfly check valve, butterfly check valve shall be closed with accurately reveal the butterfly plate opening position of letting agencies. 13 slowly-closing device related signatures, and supports should have sufficient strength and rigidity. 7 slowly-closing check valve check valve disc ( Butterfly plate) Should be opening and closing flexible, no jam phenomenon. 。 5 slow close check valve closing process should be quick closing and slowly-closing two stages, its slowly-closing time should be adjustable. In the standard technical requirements as follows: 1 the flange petition slow close check valve structure length size should be according to the provisions of GB/T12221 or according to the user agreement, the butterfly check valve opens, the butterfly plate length should not affect use. 4 4 materials. 1 slow close check valve body, Industrial Valves cover, disc ( Butterfly plate) , the valve shaft and other main parts material should be in accordance with the GB/T12236, GB/T12238 or the provisions of GB/T13932. 14 hydraulic device: standard hydraulic parts and electrical components should choose reliable quality and satisfactory performance, the survival of the fixed number of year long product, and should be in the provisions of the relevant standards imposed their attempt to conform to the standard rear can use. 4. 2 slowly-closing device damping piston cylinder material should be satisfied with the requirement of system pressure, piston and piston rod appearance should be hard chrome plating, piston, piston rod tightly closed circle should see fit and use the stack acrylic rubber oil resistant material. 8 slowly-closing device of the damping piston must be alert, when the reverse disc ( Butterfly plate) Can open the semi-automatic rapidly-changing reached out to the prescribed office location, when the check valve disc ( Butterfly plate) Closed to the gradual closing position can work slowly-closing utility. Slowly-closing device of the damping piston cylinder volume should match, such as the use of the regulator, to prevent the damping piston cylinder and the pipe is too high, the force hammer can reconcile the goals are met. 15 slow close check valve, external paint layer color luster should mean exactly the same, surface should be smooth level off, should not have scar, sag, foaming and superficial crack, etc. 2 flange size, period in accordance with GB/T17241 tightly closed surface type. 6 GB / T17241。 7 or the provisions of GB/T9112. 3 Marine valve body in accordance with GB/T12236 minimum wall thickness, GB/T12238 or the provisions of GB/T13932 standard. Q: analyze the dewatering slowly-closing check 15 technical requirements of the standard answer: now the standard related internal substantial meaning recommend as follows: the standard suitable for use PN4 nominal pressure. 0 mpa, nominal diameter DN? Office temperature greater than 80 ℃, 4000 mm, office medium for drinking water, raw water, industrial circulating water, sea water, sewage and other non corrosive medium flange petition slow close check valve. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. 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