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The check valve also known as a one-way valve or check valve, whose role is to prevent the media back in the pipeline. The bottom valve of the pump suction pipe is also a check valve class.
China check valve manufacture-Datian Valve, the specialist of China valve manufacture, main product range: control valve, ball valve, automatic recirculation valve, gate valve, butterfly valve, globe valve, check valve, choke valve, safety valve, plug valve, diaphragm valve, strainer,
pressure reducing valve and valve products.

Ministry of Construction approved and promulgated on September 30, 2001 “to the drainage slow closing check valve general technical conditions” (CJ/T154-2001) urban construction industry standards. And June 1, 2002.

Now standard, as follows:

Which is applicable to nominal pressure PN4.0MPa nominal diameter DN4000mm, the operating temperature is not greater than 80 ° C, the working medium for drinking water, raw water, industrial water recycling, seawater, sewage and other non-corrosive medium flange connection slow closing check valve.

Standard technical requirements are as follows:

1, flange connection slow closing check valve structure length dimension should be GB/T12221 requirements or user agreement, butterfly check valve is open, the disc extended length should not affect the use.

2, flange connecting dimensions, sealing surface should be in line with GB/T17241.6 of GB/T17241.7 or of GB/T9112 the provisions.

3, minimum wall thickness of the valve body should be consistent with the provisions of the standard GB/T12236, GB/T12238 or GB/T13932.

4, material

5, the slow closing check valve to close the process should be close in speed and ease the closure of two phases, the slow closing time should be adjustable.

6, slow closing check valve, check valve valve slow closing the opening of the slow closing piston extended length full adjustable.

7, slow closing check valve, check valve flap (disc) should be flexible and open and close, without jamming.

8, Slow closing the damping device is sensitive to the piston must automatically when reverse disc (disc) is open quickly stretched to a predetermined working position, when the check valve flap (disc) Close to ease the closure position can play effective slow closing. The slow closing the capacity of the damping piston-cylinder device with the use of control valves and other match, to avoid the force of the damping piston cylinder and the pipe is too high to achieve the purpose of adjustable and eliminate hammer.

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

10, self-damping slow closed check valve is not allowed with the solid particles in the raw water, sewage directly into the slow closing device to prevent blockage or damage seals.

11, the hydraulic control butterfly check valve, butterfly slow closing check valve should be equipped to display correctly the instructions of the opening position of the disc bodies.

12, hydraulic control butterfly check valve should be set to the hammer or the accumulator as an additional power source to automatically close the valve when the power failure.

13, slow closing device connection, transmission and support should be of sufficient strength and rigidity.

14, hydraulic devices: standard hydraulic and electrical components should be used in the products of reliable quality, good performance, long life, and should be carried out in accordance with the provisions of their respective standard test to be certified before use. Hydraulic device assembly, should be the parameters of performance tests and adjustments to match the valve design requirements of the “slow closing”.

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

Reproduced in: http://www.bf35.com/news/detail/25202.html

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