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What Is The Reason For The Reduction Of Outlet Pressure Of Sanitary Rotary Cam Pump?

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Sanitary Rotary Lobe Pump is a sanitary rotary cam pump with compact overall structure, small size, light weight, low noise, significant energy saving effect and easy maintenance. It adopts standard vertical motor and quick-install mechanical seal, which is very convenient to replace. The flow-passing parts of the pump are made of stainless steel (304\316) and can be used in mildly corrosive media.

Reduced outlet pressure is one of the common failures of sanitary rotary cam pumps, which directly affects the performance and efficiency of sanitary rotary cam pumps. In order to solve this type of failure, our technicians discovered the reasons for the decrease in outlet pressure of the sanitary grade rotary cam pump after long-term research and observation, as follows:

(1) The motor of the sanitary grade rotary cam pump is reversed

Due to wiring reasons, the direction of the motor may be opposite to the actual direction required by the pump. Generally, when starting, you must first observe the direction of the pump. If the direction is reversed, you should exchange any two wires on the terminals on the motor.

(2) Internal leakage occurs in the sanitary rotary cam pump

When the gap between the rotating part and the stationary part in the pump exceeds the design range, internal leakage will occur, which is reflected in a drop in the discharge pressure of the pump, such as the gap between the impeller mouth ring and the inter-stage gap in a multi-stage pump. At this time, corresponding disassembly and inspection should be carried out, and the parts causing excessive gaps should be repaired or replaced.

(3) The rotation speed of the sanitary rotary cam pump decreases

The important factors that affect the pump lift are the impeller outer diameter and the pump speed. When other conditions remain unchanged, the pump lift is proportional to the square of the speed. It can be seen that the impact of speed on the lift is very large. Sometimes because If some external reason reduces the pump speed, the pump head will be reduced accordingly. At this time, the speed of the pump should be checked. If the speed is indeed insufficient, the cause should be checked and solved reasonably.

(4) Cavitation occurs at the inlet of the sanitary rotary cam pump

If the suction pressure of the pump is too low, lower than the saturated vapor pressure of the pumped medium, cavitation will form. At this time, you should check whether the inlet piping system is blocked or whether the opening of the inlet valve is too small, or increase the liquid level of the suction pool.

(5) The operating point of the sanitary rotary cam pump shifts towards large flow and low lift.

In general, sanitary rotary cam pumps have a continuously downward performance curve, and the flow rate gradually increases as the head decreases. During the operation, if the back pressure of the pump decreases for some reason, the working point of the pump will passively shift along the device curve to the point of low lift and large flow, which will cause the lift to decrease. In fact, this is due to external factors such as the device. It is caused by changes and has no special relationship with the pump itself. At this time, the problem can be solved by simply increasing the pump back pressure, such as closing a little outlet valve, etc.

(6) The impeller flow passage of the sanitary rotary cam pump is blocked

If part of the flow path of the impeller is blocked, it will affect the work of the impeller and cause the outlet pressure to drop. Therefore, it is necessary to disassemble the pump to inspect and remove foreign matter. To prevent this problem from recurring, a filtering device can be installed before the pump inlet if necessary.

After knowing the reasons for the low outlet pressure of the sanitary rotary cam pump, the failure of the sanitary rotary cam pump can be solved as long as specific measures are taken according to the specific situation.

What Is The Reason For The Reduction Of Outlet Pressure Of Sanitary Rotary Cam Pump?

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