H48h Empty Discharge Check Valve

Basic Info.

Model NO.	H48H
Function	Ddcv Double Lobe, Nrvr Silence, Sfcv Rubber Lobe, Nrvz Silence, Nrvg Silence
Sealing Form	Hard Seal and Soft Seal
Flow Direction	Unidirection
Standard	DIN GB ANSI Bsw JIS
Application	Industrial Usage, Water Industrial Usage, Household Usage
Transport Package	Wooden Box
Specification	DN15-DN800
Trademark	XC
Origin	China
HS Code	8481804090
Production Capacity	9999

Product Description

Usage: The empty discharge check valve is installed on the outlet pipe of the high pressure feed pump of the thermal power unit to prevent the backflow of the water supply and protect the feed pump. The valve works with the automatic recirculation valve. When the feed pump is under low load or the outlet closure door is closed, the automatic recirculation bypass valve should be in the open position to ensure the safe operation of the pump. When the air discharge check valve is open, the recirculation bypass valve will automatically close.
Function principle and structure characteristics
Open the outlet valve, the feed pump starts, after the water supply reaches a certain pressure, the spool of the empty discharge check valve automatically rises, pushes away from the seat, and the water supply flows out. At the same time, the spool connecting rod pulls the emptying valve plate to close the emptying port. When the flow of the feed pump is reduced, the spool falls, and the connecting rod is pushed to pull out the emptie valve disc, and the recirculation door is opened to maintain the minimum flow of the pump. When the pump is stopped, the spool automatically falls down to close the channel, thereby preventing the damage of the water supply system by the high pressure water hammer.
1, the principle of action: open the outlet valve, the feed pump starts, after the water supply reaches a certain pressure, the valve disc rises to a certain height under the action of the water supply pressure, pushed away from the seat, the water supply is flowing out. At the same time, due to the rise of the valve disc, drive the connecting rod to rotate, toggle the vent valve disc, so that the recirculating blade valve moves down, close the drain port, when the water supply flow is reduced, the valve disc falls, push the connecting rod to open the vent valve disc, open the recirculation door to maintain a smaller allowable flow of the pump, when the pump is stopped, the valve disc automatically falls, close the valve port channel, to prevent the high-pressure water hammer water supply system from breaking 2, structural features: A, the valve with recirculation bypass valve work, maintain the safe operation of the systemB, the main valve disc up and down, the media backflow, with the medium pressure and spring under the action of the channel, at this time the bypass valve open, when the main valve disc is fully opened, the bypass valve is closed C, the valve disc seal is made of stainless steel surfacing welding, wear resistance, abrasion resistance, sealing can be By.D, the valve should be installed vertically.