Tank over flow 'D' is to prevent liquid level rising in pump body and damaging the motor.the lower lip of over flow 'D' should not be more than half inch above center of pump over flow. Isolation valve for sealing the tank during pump maintenance not essential for efficient working of the pump
	INSTALLATION-1 1.Fully open valve 'A'. 2.Allow liquid level to rise in supply tank upto overflow 'D' level. 3.Close valve 'B'. 4.Start pump. 5.Open valve 'B' gradually for required flow. Other installations 2 3 4 5 6