the valve is mainly composed of valve body, bonnet,disc,valve shaft and control valves, which is installed at the outlet of the pump to prevent medium flow back and eliminate the destructive water hammer, and can effectively reduce the water hammer pressure during the valve is opening, to guarantee the safely operation in the pipeline. the valve has advantages of light disc,large opening,notable powering saving, small flow resistance,new style of water hammer removal, stable and reliable sealing performance,high wear-resistance,long working life, reliable operation,no vibration and noise etc.

 Product Structure  


 the valve is mainly composed of main valve,needle valve, ball valve and micro filter etc, as shown in the following picture:

1. Valve body     2 Needle type control valve   3, Valve disc   4, Valve shaft     5, Bolt and Nut   6, Heavy hammer 7.Slow closing device   8, Bolt and nut 

Main Parts Materials

Parts Name	Material
Valve Body, Bonnet	Gray Cast Iron,Ductile Iron,Carbon Steel,Stainless Steel
Valve Disc	Rubber&Steel Plate Assembling, Stainless Steel Plate
Valve Stem	Stainless Steel
Slow closing device	Stainless Steel

Main performance and parameters
Water Pressure ( Temperature <=65C)

Nominal Pressure	0.6MPa	1.0MPa	1.6MPa	2.5MPa
Strength Test Pressure	0.9MPa	1.5MPa	2.4MPa	3.75MPa
Sealing Pressure	0.66MPa	1.1MPa	1.76MPa	2.75MPa
Working Pressure	0.6MPa	1.0MPa	1.6MPa	2.5MPa

 Slow closing water hammer reducing performance2.  When the medium flowing back in the pipeline,the valve can be adjusted to the peak value of water hammer 1.5 times greater than the working pressure.
3.  When the medium flowing back,the valve can be adjusted to the pump reverse speed that is not more than 1.3 times of the rated speed.
Working Principle
 the valve is mainly composed of valve body, bonnet,disc, piston, needle valve (micro control valve) and a heavy hammer. under the pushing force of the medium inlet of the valve,the valve disc is automatically pushed away, when the valve disc is fully opened, the balance hammer falls forward to the backward of the valve disc, so as to balance the weight of the valve disc, and the pressure to the water because of the valve disc weight. Additionally, the water inner the valve body flow into the cavity of the piston and the piston is fully pushed.
When the water is stopped flowing ( the electric motor is powered off), because of the weight of the valve disc and the pushing force of the flowing back, the valve disc is automatically closed, but because of the piston stem is on the top position, the valve disc can not automatically be closed, there are still 20% space left to make the water flow, the water hammer is weakened. The front end of the valve disc is pushed on the top of the valve piston, the water in the back cavity stop the piston back, that is to stop the valve disc closed. so the water can only flow slowly to the valve body through the needle valve to make the valve close slowly. The valve disc divided into quick closing and slow closing. In this case to achieve the purpose of prevent the electric motor turning reversed and weaken the water hammer. The opening length of the piston determine the opening of the slow closing of the valve disc. The opening length is longer, the valve disc opening is larger, the water hammer is smaller, but the closing time is longer, otherwise the opening length is shorter, the slow opening is smaller.