Drainage with slow closing check valve common technology resolve

The standard describes as follows:

    The standard applies the nominal pressure PN4.0MPa, nominal diameter DN? 4000mm Working temperature not greater than 80 ℃, the working medium is drinking water, raw water, industrial circulating water, sea water, sewage, and other non-corrosive media flange connection slow closing check valve. Standard technical requirements are as follows:

    A flange connection slow closing check valve structure length dimensions should be the GB/T12221 provisions or user convention, butterfly check valve is open, the disc extended length should not affect the use.

    Flange connection size, the sealing surface pattern should be consistent with the provisions of GB/T17241.6, GB/T17241.7 or GB/T9112.

    The minimum wall thickness of 3 valve body shall comply with the provisions of GB/T12236, GB/T12238 GB/T13932 standards.

    4 material

    4.1 slow closing check valve body, bonnet, disc (disc), the valve shaft parts and materials should GB/T12236, GB/T12238 GB/T13932 provisions.

    The 4.2 slow closing the device damping piston cylinder material should meet the requirements of the system pressure, the piston, the piston rod surface should be hard chrome plating, piston, piston rod seals should the stack clear rubber oil materials.

    4.3 Water Supply and anti-corrosion coatings and rubber seals slow closing check valve used in the body cavity and other metal parts in contact with water should be non-toxic and tasteless.

    Slow closing check valve closure process should be divided and the slow closing two stage quick closing, slow closing time should be adjustable.

    Slow closing check valve flap 6 slow closing check valve opening degree is slow closing piston extends the entire length should be adjustable.

    7 slow closing check valve check valve flap (disc) should be flexible and open and close, no jamming phenomenon.

    8 slow closing device damping piston must be sensitive action automatically when inverse on the valve (disc) open quickly extended to a predetermined location, can play when the check valve flap (disc) Close to slow closing slow closing role. The damping piston cylinder capacity slowly closing device should be matched with the regulating valve, to avoid the damping piston cylinder and pipeline excessive force, to achieve the purpose of the adjustable and eliminate hammer.

    9 outside damping slow closing check valve, hydraulic control butterfly slow closing check valve device should be attached to the monitor damping medium level institutions.

    10 self-damping slow closing check valve does not allow raw water with solid particles, sewage directly into the slow closing device to prevent blockage or damage the seals.
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    11 pilot butterfly check valve, butterfly slow closing check valve should be provided to correctly display the the disc opening position indicating mechanism.

    12 hydraulic control butterfly check valve should be set to hammer or accumulator as an additional power source to prepare for power off automatically close the valve.

    13 slow closing device about the connection, transmission and support member should have sufficient strength and rigidity.

    14 hydraulic devices: standard hydraulic parts and electrical components should be used for reliable quality, good performance, and long life of the product, and should the provisions of the respective standard test to be certified before use. Hydraulic device assembly, test and adjust the parameters of performance, to meet the design requirements of the valve "slow closing".

    Slow closing check valve 15 external paint, the color should be uniform appearance should be smooth, there should be no scars, sagging, the blistering and obvious cracks and other defects.