(Bonve Cam-Type Twin Rotor Pumps)

The head of a pump fundamentally represents its capability to lift liquids vertically.Key concepts include:

Suction Head:Vertical distance from the pump centerline to the lowest liquid level on the suction side,indicating the pump’s liquid"drawing"ability.

Discharge Head:Vertical distance from the pump centerline to the highest liquid level on the discharge side,indicating the pump’s liquid"pushing"ability.

Total Head:Vertical height difference between the suction side’s lowest liquid level and the discharge side’s highest liquid level,equaling the sum of suction head and discharge head.This is the total actual lift height.

System Head:During operation,liquids encounter resistance from pipelines,valves,etc.Thus,system head=total head+entire pipeline system’s resistance loss.This is the critical practical value for pump selection.

Core Principle for Pump Head Selection:The head marked on the pump nameplate(rated head)must meet the system head requirement.Accounting for pipeline resistance losses,the required head is typically 1.15-1.20 times the lift height(total head).Select a pump whose rated head closely matches this calculated value for optimal efficiency and energy economy.

Parallel Pumps:Increasing Flow Rate,Not Head

When a single pump’s head is insufficient,connecting two identical pumps in parallel operates as follows:

1.Total head remains unchanged,equal to the head provided by a single pump.Head cannot be stacked.

2.Total flow rate significantly increases,theoretically reaching twice a single pump’s flow rate(slightly lower in practice due to parallel piping characteristics).

3.Operational flexibility improves:Either pump can operate alone for low-flow demands or both together for high-flow demands,enhancing system reliability through mutual backup.

Rotor Pump Dry-Run Crisis:The Mechanical Seal’s Critical Moment

Rotor pumps pressurize liquids via high-speed rotating lobes.Under normal operation,liquid flowing through the lobes continuously lubricates and cools the connected mechanical seal.However,when gas exists inside the pump(e.g.,dry-run or cavitation),danger arises:

1.Gas Accumulation:During lobe rotation,gas is pushed toward the lobe periphery with the liquid,ultimately accumulating into large bubbles at the mechanical seal.

2.Lubrication Failure:Bubbles envelop the seal’s friction pair(stationary ring and rotating ring),blocking the liquid essential for lubrication and cooling.

3.Temperature Surge:The uncooled friction pair generates intense heat through high-speed dry friction,causing temperature to spike rapidly.

4.Seal Failure:

O-Ring First Affected:Under high temperatures,rubber O-rings soften,deform,melt,and burn out first.

Friction Pair Destruction:The stationary and rotating rings undergo severe unlubricated dry grinding,rapidly roughening their once-precise sealing surfaces and completely losing sealing function.Seal failure causes severe leakage of pump fluid(or gas),leading to total equipment damage.

Bonve consistently upholds the philosophy of"Wholeheartedly Dedicated to Perfecting Rotary Pumps,"committed to providing global customers with customized conveying and mixing solutions.Should you have any technical inquiries about Bonve rotary pumps,selection requirements,case study references,or other collaboration intentions,please feel free to contact us at any time.

Service Hotline:0574-87588986,13586591794

Official Website:www.bvpumps.com

Business Email:market@bonvepumps.com

We look forward to partnering with you,driving efficiency and innovation in industrial fluid transfer through precision technology.