the valve body and disc
A disk-shaped, valve, valve seat passage around the rotating shaft to rotate, due to a passage in the valve into the flow line, flow resistance score single type, double valve type and most type three, these three forms according to the valve bore to points, the purpose is to prevent medium stop flow or backflow, weakening hydraulic impact.
Two: the valve body, valve along the vertical center line of the sliding, can only be installed in horizontal pipelines, small caliber in high pressure check valve valve valve can adopt a ball. The body shape and the same ( and general ), so it is more fluid drag coefficient. Its structure is similar, the valve body and valve with the same. The upper and lower valve valve cover processed with the guiding sleeve, valve guide Jane in the valve guide Jane lamp free lifting, when the medium downstream, the Valve by the medium thrust open, when the medium stopped flow,knife gate valve, valve by vertical landing from the seat, to prevent medium backflow effect. Straight through type medium inlet and outlet channel direction and the valve seat passage direction vertical; vertical, the medium inlet and outlet channel direction and the Valve seat passage in same direction, the flow resistance is a type of small.
Three, disc : disc around the valve seat within the pin shaft rotation. The dish has the advantages of simple structure, can only be installed in horizontal pipelines, poor sealing.
In four, a pipeline type: the valve flap along the centre line of the valve body sliding valve. Pipeline type is emerging as a valve, its small size, light weight, good processing, is one of valve development. But the fluid drag coefficient is slightly big.
Five, pressing type: This valve is used as boiler feed water and steam cut-off valve, and it is the comprehensive function or angle valve.
In addition, there are some does not apply to the pump outlet installed, such as valve, spring type, Y type
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