Water industry pipeline with micro resistance slowly-closing butterfly check valve general technology

Roll tube with micro resistance slowly-closing butterfly check valve general technology 1 micro resistance slowly-closing butterfly check valve flange connection structure length dimension should be according to the provisions of GB/T12221 or according to the user agreement, butterfly check valve opens, the butterfly plate extended length should not affect the operation now will introduce standard related content are as follows: the standard nominal pressure PN4 shall apply. 0 mpa, DN4000mm nominal diameter, working temperature is not more than 80 ℃, working medium for drinking water, raw water, industrial circulating water, sea water, sewage and other corrosive medium of flange connection of the micro resistance slowly-closing butterfly check valve. Flange connection standard technical requirements are as follows: 1 the structure of the micro resistance slowly-closing butterfly check valve length should be according to the provisions of GB/T12221 or according to the user agreement, butterfly check valve opens, the butterfly plate extended length should not affect the use. 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 be consistent with GB/T12236, GB/T12238 or the provisions of GB/T13932 standard. 4 4 materials. 1 micro resistance slowly-closing butterfly check valve valve body, valve cover, valve flap ( 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 micro resistance slowly-closing butterfly check valve 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 micro resistance slowly-closing butterfly check valve closing process should be quick closing and slowly-closing two stages, its slowly-closing time should be adjustable. 6 micro resistance slowly-closing butterfly check valve non-return valve disc slowly-closing opening out that slowly-closing piston length should be adjustable. 7 micro resistance slowly-closing butterfly check valve non-return 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 inverse on the valve disc ( Butterfly plate) Opens automatically reached out to the scheduled work position quickly, when the non-return valve disc ( Butterfly plate) Closed to the gradual closing position can effective slowly-closing role. Slowly-closing device of the capacity of damping piston cylinder shall be the use of the regulating valve and other matching, avoid damping piston cylinder and the pipe is too high, the force can reconcile of hammer. 9 external damping micro resistance slowly-closing butterfly check valve, hydraulic control butterfly check valve slowly-closing device should be attached to monitor damping medium level. 10 micro resistance gradual closing valves are not allowed to back with a 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 micro resistance slowly-closing butterfly check valve should be equipped with display correctly 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, for power is automatically shut off the valve gate. 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 door & throughout; Slowly-closing & throughout; The design requirements. 15 micro resistance slowly-closing butterfly 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.