* Plate FLANGE (Plate Flange, Flat Flange, Plain Flange) Loose Flanges,Stainless Steel Loose Flange,Precision Loose Flanges,DIN 2641 Loose Flange Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflanges.com
* SLIP ON FLANGE (SORF SOFF FLANGE)
* WELDING NECK FLANGE (WNRF FLANGE)
* BLANK FLANGE (BLIND FLANGE, BLFF FLANGE, BLRF FLANGE)
* THREADED FLANGE (SCREWED FLANGE)
*BACKING RING FLANGE
For the centrifugal pump, first slowly close the control valve, and then stop the pump is the importance of: then the medium flow tube speed from the rated flow rate gradually reduced to zero, the speed gradient is minimal, which can effectively prevent the pump from happening and Pump reversal; Pump shaft power gradually reduced from the rated power of the operating power, is conducive to unit safety. Working principle: When the pump needs to be stopped, as long as the control power supply of the solenoid valve is cut off first, the solenoid valve executes the commutation command to close the pressure water source in the lower piston cavity and the circuit in the upper cavity of the piston and open the pressure water source in the upper cavity of the piston Piston through the atmosphere of the lower chamber loop, that is, the pressure of imported water as the driving source, slowly close the control valve, and other control valve is fully closed, the limit switch to stop the pump command operation, the whole process of automatic control. Control valve slow closing time can be adjusted by the throttle valve in the range of 5 ~ 60s or according to user needs to choose.