Now will introduce standard related content are as follows: the standard nominal pressure PN4 shall apply. 0 mpa, nominal diameter DN? 4000 mm, the working temperature is not more than 80 ℃, working medium for drinking water, raw water, industrial circulating water, sea water, sewage and other corrosive medium flange connection slow close check valve. In the standard technical requirements are as follows: 1 the structure of the flange connection slow close check valve length 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 the use of. 2 size of flange connection, sealing surface type should comply with GB/T17241. 6 GB / T17241。 7 or the provisions of GB/T9112. 3 the valve body, the minimum wall thickness should comply with the GB/T12236, GB/T12238 or the provisions of GB/T13932 standard. 4 4 materials. 1 slow close check valve body, valve 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. 4. 2 slowly-closing device damping cylinder piston material should meet the requirements of system pressure, the surface of the piston and piston rod should be hard chrome plating, piston and piston rod sealing ring stack should be adopted for the fine rubber oil resistant material. 4. 3 water with slow close check valve body cavity and other metal parts in contact with the water anticorrosive coating and rubber seals shall be adopted by the non-toxic tasteless. 5 slow close check valve closing process should be quick closing and slowly-closing two stages, its slowly-closing time should be adjustable. 6 slow close check Industrial Valves check valve disc slowly-closing opening namely slowly-closing piston out should be fully adjustable length. 7 slowly-closing check valve check valve disc ( Butterfly plate) Should be opening and closing flexible, no jam phenomenon. 8 slowly-closing device of the damping piston must be nimble, when the reverse disc ( Butterfly plate) Opens automatically reached out to the scheduled work position quickly, when the check valve disc ( Butterfly plate) Closed to the gradual closing position can effective slowly-closing role. Slowly-closing device of the damping piston cylinder capacity and the use of the regulator should be match, avoid damping piston cylinder and pipeline strength is too high, can reconcile of hammer. 9 damping slow close check valve, hydraulic control butterfly check valve slowly-closing device should be attached to monitor damping medium level. 10 since damping slowly-closing valves are not allowed to contain solid particles of raw water, sewage directly into the gradual closing device, so as to avoid blockage or damage the seals. 11 hydraulic control butterfly check valve, butterfly check valve should have closed correctly display the butterfly plate opening position indicating device. 12 hydraulic control butterfly check valve should be set a heavy hammer or accumulator as a additional force source, close the valve automatically in case of power cuts. 13 slowly-closing device for connection, transmission and supports should have sufficient strength and rigidity. 14 hydraulic device: standard hydraulic parts and electrical parts should choose reliable quality products, good performance, long service life, and shall be in accordance with the provisions of the respective standards test, qualified rear can use. After hydraulic device assembly, should carry on the performance testing and adjusting the parameters, make it accord with the valve 'slowly-closing' design requirements. 15 slow close check valve, external paint layer should be uniform color and appearance should be smooth level off, should not have scars, sag, foaming, and obvious defects such as cracks.
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