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                      pressure wave

The flow-directing mechanism, in the valve, has the functions of flow-guiding and pressure-stabilizing.

In the corner of pipe, the water hammer is the most obvious. The design is for meeting the requirement and set the arrestor at the corner directly. This design not only saves the space and is easy to set up, and also can replace the traditional crooked head to reduce the cost of setting up.

L style has the double way water-hammer-absorbing and has excellent results.

Patent Number : 131907





The test pressure of valve body
  Bronze : 12 kgf/cm2
  cast iron: 21kgf/cm2
  stainless steel : 35kgf/cm2
The applied conditions : normal fresh fluid
Applied temperature:-15C to 80C
If the diameter is large than 2", stainless
steel valve is available.
If the fluid is acid/base or oil, the air bag
made of special material should be applied.



Flange style
cast iron or stainless steel
\ A B C air chamber
2" 230 110 105 1490cm3
2.5" 260 130 115 2130cm3
3" 275 140 125 2465cm3
4" 345 155 150 5535cm3
6" 467 200 200 15325cm3
8" 560 235 232 27230cm3
10" 685 280 280 48725cm3
12" 765 310 313 67860cm3
Thread style
cast iron or stainless steel
\ A B C air chamber
2" 230 110 105 1490cm3
Thread style Bronze
\ A B C air chamber
1/2" 50 25 25 17cm3
3/4" 65 30 30 30cm3
1" 80 35 35 63cm3
1.2" 95 43 45 130cm3
1.5" 115 50 50 205cm3
2" 170 110 68 650cm3

When and where should the L style water hammer arrestor be set up?
When the pump shut off, the pressure decrease instantly and cause the unstable positive and negative pressure gap which cause water hammer effect and create noise and pipe vibration.
To set up water hammer arrestor at the pipe corner upside of the pump (shown as the figure) can prevent the water hammer effect and protect the machine.

Remark:
When lift is longer than 50m and pressure is 5 kgf/cm2, we suggest to set up arrestors each at the downside of the long pipe and the corner upside of the check valve.		  



It's easy to cause water hammer effect when the valve close fast. To set up arrestor at the first corner away from the fast-shut-down valve can absorb and prevent the water hammer effect directly and eliminate the noise.
            
               silent check valve
When the fluid flow through the serial corner, the change of flow speed and direction and friction effect will cause unstable pressure wave, which will lead to vibration and noise. To set up arrestor and silent check valve can eliminate the pressure wave.
Remark:
The pressure meter on the valve will show the air chamber pressure before piping and show the pipe pressure after piping.
To leave a 10 cm opening between valve and wall for easy to maintain.
Considering the high-pressure situation, cast iron or stainless steel valve body is suggested for the valve whose diameter is larger than 2".
When lift is longer than 50 m and pressure is 5 kgf/cm2, we suggest to set up arrester each at the downside of the long pipe and the corner upside of the check Valve.
Before setting up, make sure the pressure of water hammer arrester air chamber cannot be higher than pipe pressure.
When the pressure of the air chamber of the water hammer arrester is maintained at the 60% ~ 90% of pipe pressure, the arrester will have the best water-hammer-preventing result.
If the water pressure in the pipe is too low or the air pressure of the arrester air chamber is too low. Both can be corrected by pumped into air or release air from the air-pumping hole at the top of the arrester.
When the Outlet is under open pressure like float valve, bathroom equipment and faucet, input pressure 1 ~ 1.3 kgf/cm2 is preferred.
 

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