[Three rain valve to recommend Star Products - Mechanical seal]: 1. according to user needs with double rail automatic coupling installation system WQ15-35-4 pump, it brings a great convenience for installation, maintenance, people can You do not have to get into the sump. 2. WQ20-25-4 pumps can be used in the whole head, and ensure the motor is not overloaded. 3. There are two types of installation, fixed automatic coupling installation system and traveling free installation system. [Three rain valve to recommend Star Products - Mechanical seal] Description: in general centrifugal pump, the power always increases with increasing flow, that is, the power curve is a rise with the increase in traffic WQ37-13-3 pump curves, this use of the pump creates a problem: when the pump is running at design point when, in general, the pump motor power is less than the rated power, the use of this pump is safe ; but when the pump head is reduced, the flow will increase, power also increases. When the traffic flow exceeds the design point and reaches a certain value, the pump motor input power may exceed the rated power and causing the motor overload and burn. Motor overload protection system running either the pump stops operation; or burn the motor protection system failure. Pump head lower than the design conditions point lift for use in practice is often encountered a situation when the pump is the pump selection, pump head selected too high, but the actual use of the pump is lower lift use; the other is that, in use, the pump operating point is determined not so good, in other words the pump flow require frequent adjustment; there is a situation that requires frequent change of venue pump use. WQ60-9-3 pumps, Zunyi pumps, submersible pumps selected three rain, rain valve provided by the Tianjin Trade Co., Ltd. Valve Co., Ltd. of Tianjin, rain (www.tjsymf.com) (www.tjsymf.com) strong, credible, in Tianjin seal industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead, rain valve into the brilliant and you work for a better future!