Slow closing check valve

The butterfly check valve is mainly composed of a valve body, two semi-circular valve discs, a return spring, an oil storage cylinder, a small cylinder group and a needle valve (micro-control valve). The principle mainly relies on the thrust action of the imported medium to push the two valve discs smoothly. At the same time, the imported pressure medium enters the lower part of the piston in the cylinder, pushes the piston, and presses the oil in the upper part of the piston into the small cylinder tail end on both sides of the valve body through the needle valve, so that the piston rod in the small cylinder is extended. When the pressure of the inlet medium drops below the outlet pressure, the medium will produce a backflow, and the valve disc will automatically close under the action of the spring and the media backflow. However, because the piston rod is in the extended position, the support valve disc can not be completely closed, and there is still about 20% of the area to make the medium pass through, which plays a role in eliminating the water hammer. The valve disc is divided into two steps by the piston: first fast closing and then slow closing, so as to prevent the motor reversal and eliminate the mute effect.

The slightly retarded butterfly check valve is a kind of valve. It can be used in the drainage pipe of clean water, sewage, sea water and other media, which can prevent the backflow of the medium, and effectively limit the destructive water hammer to ensure the safe use of the pipeline

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 470 gallon liquid totes Special package is available on request. E FORUs’  is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition.