Automatic principle and installation specification the backflow valve is installed on the boiler feed water pump export, to prevent the reverse feed water, and to ensure that the minimum flow recirculation bypass has certain. Second, the structure characteristics and working principle: the feed water pump in the three-way valve by the body and cover through flange connection, so that the grinding, installation, maintenance, maintenance, and seat changed one-piece structure. Seat and disc are surfacing welding carbide, ensure the erosion resistance, abrasion resistance and sealing, prolong the service life. Inside of the body and to ensure the seal for rubber sealing ring seal, seal reliability. The body of import and export and export recirculation system are connected by flange, convenient for dismantling and maintenance. Is installed in the pump export, but it can automatically detect the size of the pump flow, and through the control valve pilot valve recycled actions ( Replaced the previous controlled by the pressure of indirect recycle action) 。 Body with recirculation relief facilities, can make high pressure medium flow around after a lot of small size and spend a lot of energy to reduce pressure recirculation system. This valve only at very low flow have a recirculation cooling pump, when the normal operation of pump, not recycle, thereby saving the previous consumption by continuous recirculation of electricity and water. The automatic recirculation Industrial Valves does not need to electrical wiring, also do not need two regulator series ( One for the adjustment, one for the cut off) And the high-speed flow can bring a high pressure system is easy to stay and to minimize erosion phenomenon. Its working principle is given priority to reduce Industrial Valves flow, the main valve disc to seat under the action of a spring force direction, when achieved through flow pump minimum flow, the link of the disc drive the pilot valve, reduce pressure on the piston, the piston move to open the bypass valve, ( Through the bypass valve fluid under the regulation of the by-pass Industrial Valves, make the medium step-down) , so that the pump at low load operation there is a small amount of recycled, guarantee the cooling pump. When flow more than the minimum flow of the pump, the main valve, pilot valve closes, cut off the bypass. Fundamentally solve the previous system operation is not smooth, the noise big, short life, shortcomings and so on is expensive, and inconvenient installation and maintenance. Has completed the test, after inspection of the valve has good assembly debugging, users do not need to overhaul, can install and use directly. Transport hoisting process, handle with care to avoid collision. installation, the flow direction of medium should be consistent with the direction arrow as shown on the valve. should be stored in a dry place, not in open air, deposit should be blocked the valve channel ports, prevent sundry fall into. Inventory must be maintained regularly to prevent rust.
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There are different types of , mainly os&y gate valve and resilient seal gate valve.
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