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Protection valve for automatic circulating pump

Simple structure, reliable and stable operation, only a small number of moving parts. Easy to install, can be installed vertically or horizontally at the pressure outlet of the pump. The bypass flow is large, up to 60% of the main flow, and the KV value can be adjusted. The maximum operating pressure difference of the bypass is 4MPa. You can choose to increase the bypass check function. Can be applied to water, oil, methanol and other liquid media. Operating temperature from -196°C to +300°C.

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Keywords: Valve

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Detailed introduction

Protection valve for automatic circulating pump
STZDT series automatic circulating pump protection valve is a pump protection device. It automatically pumps centrifugal pumps (especially hot water media) at low load operation when the pump body may be out.
 
Now part of the cavitation damage and instability to protect. Once the pump flow rate is lower than the preset flow rate, the bypass is fully opened to ensure the minimum flow rate required by the pump. Even if the main road is completely
 
Closed, that is, the main road flow is zero, the minimum flow can also be automatically circulated through the bypass. The pressure is reduced by an integrated multi-stage throttling pressure reducing valve in the bypass. ZDT Department
 
Bypass columns with larger caliber. This valve is used for large bypass flow, the pressure difference is up to 4MPa, the specific choice is determined by the factory.
Features:
Simple structure, reliable and stable operation, only a small number of moving parts.
It is easy to install and can be installed vertically or horizontally at the pressure outlet of the pump.
The bypass flow is large, up to 60% of the main flow, and the KV value can be adjusted.
The maximum operating pressure difference of bypass is 4MPa. You can choose to increase the bypass check function.
Can be applied to water, oil, methanol and other liquid media. Operating temperature from -196 ℃ to 300 ℃.
Principle of action:
According to the different sensed main flow, the main valve flap check cone of the automatic recirculation valve will automatically move to a certain position. At the same time, the main disc drives the bypass valve stem, which will
 
The main valve flap action is transmitted to the bypass, and the throttle area of the bypass is changed by controlling the position of the bypass valve flap, thereby controlling the flow through the bypass. When the main disc returns
 
When the seat is closed, all flow flows back through the bypass. When the main flap rises to the top position, the bypass is completely closed and all pump flow is directed to the process system.
 
The valve combines four functions in one.
Flow sensing: the main valve of the automatic recirculation valve can automatically sense the main flow in the process system, so as to determine the position of the main valve and the bypass valve according to the flow.
Recirculation control: The automatic recirculation valve can suck the minimum flow required for the normal operation of the pump into the storage device through the bypass, and adjust the H-Q characteristics of the pump.
 
Now recycling.
Bypass multi-stage decompression: the bypass control system can reduce the return medium from the high pressure at the pump outlet to the low pressure in the suitable return storage device with low noise and small wear.
Check: The automatic recirculation valve also has the function of a check valve to prevent the liquid from flowing back into the pump body. STZDT bypass check is an optional feature.
Other bypass sizes can be made as required; the maximum bypass flow depends on the maximum Kv value
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