Drainage slow closing check valve with the general technical conditions

The standard is introduced as follows: This standard applies nominal pressure PN4.0MPa, nominal diameter DN? 4000mm, the working temperature is not more than 80 ℃, the working medium for drinking water, raw water, industrial circulating water, seawater, sewage and other non-corrosion Flanged, non-returnable, non-return valve for fluid-tight media. Standard technical requirements are as follows: 1 Flange connection slow closing check valve structure length size should be GB / T12221 provisions or according to user agreement, butterfly check valve is open, the disc protruding length should not affect the use. 2 flange connection size, sealing surface type should be consistent with the provisions of GB / T17241.6, GB / T17241.7 or GB / T9112. 3 valve body wall thickness should be consistent with GB / T12236, GB / T12238 or GB / T13932 standards. 4 Materials 4.1 slow closing check valve body, bonnet, disc (disc), valve shaft and other major parts of the material should be GB / T12236, GB / T12238 or GB / T13932 requirements. 4.2 Slow closing device Damper piston cylinder material should meet the system pressure requirements, piston, piston rod surface should be hard chrome plated, piston, piston rod seal should be used such as stack of clear rubber and other oil-resistant materials. 4.3 feed water slowly closing check valve body cavity and other metal parts in contact with water used in anti-corrosion coatings and rubber seals should be non-toxic and tasteless. 5 slow closing check valve closing process should be sub-closed and slow closed two stages, the slow closing time should be adjustable. 6 slow closing check valve check valve flap slowly closed the slow closing piston that the length should be adjustable. 7 slow closing check valve check disc (butterfly) should be open and close flexible, no jamming phenomenon. 8 damping device in the damping piston must be sensitive to action, when the valve flap on the reverse (butterfly plate) can be quickly automatically extended to the intended work position, when the check valve flap (butterfly plate) closed to the slow-closing position can play Effective slow closing effect. The damping piston cylinder in the retarder should have the same capacity as the regulating valve used to avoid the excessive force of the damping piston cylinder and the pipeline to achieve the purpose of adjustable and hammering. 9 external damping slow closing check valve, liquid-controlled butterfly check valve slow closing device should be attached to the body to monitor the damping medium level. 10 self-damping slow closing valve does not allow raw water with solid particles, sewage and other direct access to the slow closing device, so as to avoid blocking or damaging the seal. 11 pilot butterfly check valve, butterfly slow closing check valve should be provided with a correct indication of the opening position of the disc indicator. 12 Liquid-controlled butterfly check valve should be set to hammer or accumulator as an additional force source, to automatically shut off the valve when the power is off. 13 slow closing device connection, transmission and support should have sufficient strength and rigidity. 14 Hydraulic equipment: Standard hydraulic parts and electrical components should be used reliable quality, good performance, long life products, and should be tested according to the relevant standards, only after passing. Hydrodynamic device assembly, the performance parameters should be tested and adjusted to meet the valve "slow closure" design requirements. 15 Slow closing check valve external paint layer, the color should be uniform, the appearance should be smooth, there should be no scars, sagging, blistering and obvious cracks and other defects. More Keyword Search: Check Valve

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