A hot water circulation pump failure water causes 1. Hot water pump inlet and outlet valves are not open, out of the pipeline obstruction, abortion impeller blockage. Solution, remove obstruction.
2. Motor running in the wrong direction, motor phase loss is very slow. Adjust the motor direction, sturdy motor wiring.
3. Hot water circulation pump suction pipe leaks. Tighten the sealing surface, remove the air 4 pump is not filled with liquid, the pump cavity with air. Open the pump cover or open the exhaust valve and drain the air.
5. Inadequate supply of import and export, suction stroke is too high, the valve leaks. Shutdown inspection, adjustment (water pipe and pipelines with suction easy to use this phenomenon).
6. Pipeline resistance is too large, improper selection of centrifugal pumps. Reduce the pipeline bend, re-election pump II. Hot water pump failure flow reasons 1. Hot water circulation pump import and export valves are not open, out of the pipeline obstruction, abortion impeller blockage. Solution, remove obstruction.
2. Pipeline, hot water circulation pump impeller impeller blockage, scale deposition, valve opening insufficient. Remove the obstruction and readjust the valve opening.
Centrifugal pump voltage is low. Regulated.
Impeller wear. Replace the impeller.
5 over the rated flow use. Regulate the flow off small outlet valve.
Centrifugal pump suction is too high. Lower suction.
7. Pump bearing wear. Replace the bearing.
Three hot water circulation pump malfunction noise vibration reasons 1. Pipe support instability. Stabilize the pipeline.
Liquid mixed with gas. Increase suction pressure exhaust.
3. Cavitation generated. Reduce the degree of vacuum
4 bearing damage. Replace the bearing.
5. Motor overload heating operation. Regulate the flow off small outlet valve.
Four hot water circulation pump fault motor heating reasons 1. Hot water circulation pump flow is too large, overload operation. Close the small outlet valve 2. Rub. Check exclusion.
3. Hot water circulation pump motor bearing damage. Replace the bearing.
Insufficient voltage. Regulated.
Five hot water circulation pump failure reasons 1. Hot water circulation pump mechanical seal wear. replace.
2. The pump has sand holes or cracks. Welding repair or replacement.
3. sealing surface is not flat. Trimming.
4. Loose mounting bolts. Tighten.
For the structure of the triple-eccentricity seal Butterfly Valve, when the valve is under the complete open state, its butterfly plate sealing face will break away from the valve seat sealing face completely; when it is opened from 0 to 90°, the butterfly plate sealing face will break away from the valve seat sealing face upon opening; when it is closed from 90° to 0°, and only upon closing, the butterfly plate sealing face can contact and press onto the valve seat sealing face tightly.
Design Features
Design standard as per: API 609, ASME B16.34, GB/T12238, JB/T 8527.
Small installation space, light weight, and maintenance friendly;
Good sealing effect and long service life;
Simple structure and small opening/closing torque;
Good flow adjusting ability, high precision of flow characteristic curve and good dynamic adjustment stability;
For soft seat the leakage rate: ANSI B 16.104 Ⅵ.
Product Range
Body material: carbon steel, stainless steel, alloy steel
Nominal diameter: 2"~180"(DN50~DN4500)
Pressure range:Class150~600(PN10~PN100)
End connection: RF, RTJ
Working temperature:-46℃~+200℃
Operation : wrench, worm gear, electric, etc.
Double Offset Butterfly Valve, High Performance Butterfly Valve, Triple Offset Butterfly, Pneumatic Actuator Butterfly Valve
Zhejiang Zhongcheng Valve Co.,Ltd. , http://www.apivalvestar.com
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