Brief introduction of waterpower control valve
The control valve for waterpower can be classified into the dissepiment type and the plunger type, which are of the same working principle. It is made up of a master valve（figurel、2） and a outside needle valve, pilot valve, pipe and pressure gauge etc. It also can be categorized into float valve for remote control, reducing valve, slow close check valve, flow control valve, releasing pressure/keeping pressure valve, electric control valve for waterpower, water level valve, water pump control valve, emergency shutoff valve according to the using purposes and functions as well as the places in service.
Control valve for waterpower can be adjusted automatically depending on the different pressure between upriver and downsteam making the disc of the master valve open completely or close fully at the same time, or valve in adjusting condition.
Full cut-off condition: when inlet pressure enters body and control room, meanwhile the exterior ball valve of the master valve closes so the master valve sha日be in condition of f}川cut-off:
Full opening condition: After the exterior ball valve of master valve opens completely, the control room pressure is let out to the air or the downsteam lower pressure area to make the master valve be in condition of full opening.
Floating condition:the open-close degree of adjust the exterior ball valve of the master valve，make the flow through needle valve and ball valve balance, at this time the master valve shall be in floating condition.