Casting Grey Cast Iron valve

For smaller butterfly valve, packed as carton case!

For bigger butterfly valve, packed as wooden box.

But all this depends on customers requirement!

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  The use of butterfly valve
 
1, before installation should check the technical parameters of the valve and the actual conditions in the pipeline, including pressure, temperature, medium;
 
2, especially when installation mainly are:
 
In the flow direction of medium, and a linear sealing butterfly valve with no flow requirements, this is decided by its seal structure and on both sides of the same bearing capacity.
 
Eccentric type sealing butterfly valve with flow requirements, usually domestic so-called two-way sealing actually is a true sense of the word pairs
 
To, only positive and negative two direction under the rules of stress level can meet the sealing requirements, such as PN10 level on the gauge
 
1.1 mpa can afford, but can bear one side must be 1.6 and 2.Zero or more pressure, the domestic factory
 
Home in order to ensure that the most disadvantageous side sealing and achieves two-way sealing requirements, just increase the surplus quantity (sealing pressure ratio), production
 
Product seal wear to soar, in fact is at the cost of product life and lower quality of two-way sealing effect.
 
Product installation to not necessarily must comply with the direction the best pressure on the valve body, should according to the actual working condition and flexible application, this also is the present domestic some installation company some technical blind area, in my years of experience in design and pipe application, type eccentric butterfly valve installed in different piping section of the installation direction each are not identical, also there is only one main purpose, under the premise of the normal application of line, must fully consider line maintenance in the future, the direction of the arrow marked on the valve shell is not everyone to the flow direction of medium is usually understood, is the best pressure direction valve, pressure on the direction of the valve is closed, which is very important in today's urban water supply network system, the urban water supply network by way of unidirectional water supply is no longer in the past, and adopts circular water supply method, namely manifold and water supply, the system is sufficient to ensure the local line fault and hose pressure maintenance, therefore, in the installation, consider analysis of butterfly valve on the pipeline maintenance mode in the future, in general, it is possible to repair period for the downstream of the valve, the expansion of butterfly valve should be installed in the downstream, also easy to the maintenance of the valve, and can effectively prevent the expansion had pulled off;For pump room water butterfly, that is about to reverse direction arrow, in nearly, and so on.
 
Another install butterfly valve is important to note that now a lot of pipe network with outer diameter calibration of PE pipe, such as butterfly valve installation must ensure that can fully open, no interference with the line;
 
Flange type butterfly valve, butterfly valve, especially with the installation of piping flange must maintain uniform symmetric fastening, ha ha, reason is simple, serious consequences!
 

 
The characteristics of the butterfly valve
 
(1) butterfly valve adopts lever type opening and closing structure, make the relative sliding between the butterfly valve sealing pair is very small, reduce the relative wear.
 
(2) butterfly valve actuator using connecting rod strengthening institutions.The institutions in the butterfly valve in the closed state, can drive the output torque, and has the self-locking performance, safe and reliable work.
 
(3) the metal plane sealing structure, butterfly valve has a strong corrosion resistance and wear resistance, suitable for high temperature environment, long service life.
 
Optimization design was carried out on the key components (4) butterfly valve, make the total number of the valve opening and closing can reach 1 x 106 times or more.
 
(5) butterfly valve control system USES non-contact reed switch, without being limited by the environmental conditions, and sensitive signal butterfly valve accuracy is high, can realize remote control, pneumatic control and automatic control, and form a complete set of equipment can realize unmanned operation.
 
Failure and eliminating measures:
 
1 filler leakage
 
2 packing gland is too loose, can evenly to the packing gland nut and tighten.
 
3 packing ring number is not enough, should increase the packing.
 
4 packing due to improper use too long or save failure, a new packing should be replaced.
 
5 leakage between the valve body and disc sealing surface
 
Sandwiched between 6 sealing surface dirt, can wash to eliminate it.
 
And sealing surface damage should be to welding processing.
 
8 soft sealing ring is damaged, to replace the new ring.
 
9 stem rotation is not flexible
 
10 the tight packing pressure, should be properly loosen packing gland nut.
 
11 gland malposition, stem and should be uniform budge on the packing gland nut, gland returned to its normal position.
 
12 the valve stem and valve stem has killed, bearing damage, shall be open to eliminate.
 

1, the butterfly valve can be installed in any position on the pipeline.

2, butterfly valve installation position should guarantee the use and convenience of maintenance and replacement.

3, the butterfly valve installation can not consider line medium flow direction, allowing two-way flow.

4, butterfly before installation should be stored in a dry indoor place, valve plate slightly open 4 ° ~ 5 °.

5, butterfly before installation should undertake the following work:

A, carefully check whether the usage is consistent with the butterfly valve performance specifications.

B, clean inner cavity and the sealing surface, there is no dirt clinging to the body, don't open/close the butterfly plate before cleaning.

C, check whether transmission device and the butterfly valve flange connection is reliable.

6, butterfly when pipe clamp, pay attention to whether the relay of uniform and reliable.

7, the butterfly valve is installed, the pipeline strength test, valve plate must be in an open position.

8, the butterfly valve is installed, should periodically check, the check the main projects are as follows:

Whether a, butterfly valve seat and type O sealing ring damage.

B, the valve plate seal face seal performance.

C, butterfly valve repair after assembly, opening and closing rotates can not have jam phenomenon.

D, butterfly valve repair after the assembly, should seal performance test in accordance with requirements.

F, after each maintenance, should be detailed records for reference.

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